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					Rovtec Systems

SmarT-Trigger 4

Operation Handbook

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SmarT-Trigger Intelligent Four Channel Fire Control System Operation Handbook

SmarT-Trigger 4
September 1997 Revised May 1998

Rovtec Systems. (May 1998) Ford De Fyne Naul Co Dublin Ireland. Fax 353-1-8413868 email rovtec@indigo.ie Embedded Control Solutions For The High Resolution Survey Industry
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SmarT-Trigger 4 Operation handbook Contents
System Over View What Can The System Do ? SmarT-Trigger 4 Technical Specifications Getting Started Power Up page page 3 4

page 5 page 6 page 6 page 7 page 8 page 9 page 10 page 11 page 12 page 12 page 13 page 14 page 15 page 16 page 16 page 17 page 18 page 18 page 19 page 20 page 21 page 22

General control of the system Setting the Print Delays Setting up the Channels Setting up the Channels The Parameters Channel Parameters contd.. Setting up the Master Channel Setting up a Channel as Side Scan Saving and Restoring System set-up's The Inhibiting Process , An Overview The Inhibiting Process , Detailed explanation Mesh Delays Synchronising Channels Mesh Delays Displaying the Outputs Synchronising External events Removing Interference System Installation Dual System Software System Block Diagram Rear Panel connections Front Panel LED's Trouble shooting

Rovtec Systems. Ford De Fyne Naul Co Dublin Ireland. Fax 353-1-8413868 email rovtec@indigo.ie

SmarT-Trigger 4 Operation handbook

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System overview.
The SmarT-Trigger 4 system is an embedded control approach to multiple source firing and inhibiting during integrated shooting aboard high resolution survey vessels, or when ever multiple sources are being fired from a high resolution survey vessel. The system comprises of four independent Fire Control Channels housed within a single “2U” 19 inch rack mount enclosure together with a fifth channel (input only) which is the master inhibit sequencing channel. The fifth channel is dedicated to monitoring the system synchronisation input and effecting the Control communications between the controlling PC and each of the four source trigger channels. The master channel processor can respond within 250n Sec’s to an external trigger event.

The Four channels of Fire control are controlled by a simple graphic user interface running on A standard Windows PC, The PC Controls the SmarT-Trigger 4 system down a standard serial cable. The four separate channels of source triggering can have their output repetition periods, pulse and closure widths , and output voltage levels set by the user , using the PC Interface. The four channels can operate as a trigger source at any rate,(1 mSec –16S) or can be triggered externally by a pulse or closure input. The outputs can be delayed by any desired delay time, The outputs can also be a function of “N” Counts of input trigger , giving a Divide by “N” Function. In addition to the normal capabilities of standard fire control units, each channel of the SmarT-Trigger 4 system can be inhibited for a user set pre determined time during master system data acquisition.

With set-up information supplied by the user each channel can make a decision each busy period of the master acquisition system to determine exactly how many shots may be safely issued to the interfering source. The fire outputs of any one channel of SmarT-Trigger 4 can be moved in time with respect to any other channel output , enabling cross interference between analogue systems to be minimised. The Outputs of every channel have TTL pulse and isolated closures available (Four Pulse drives and Four Closure drives) , if channels are been driven from an external trigger source , both closure and TTL pulse input sockets are provided. Overall the SmarT-Trigger 4 system aims to provide precise control over multiple source triggering, interference minimisation, and removal of this interference in the modern integrated survey environment.

SmarT-Trigger 4 Operation handbook

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What Can the System Do?: The Master Synchronisation channel What does it Do ? … runs a standard serial interface to the Controller PC. (Fixed 19200 8 N 1) …monitors both pulse and closure inputs for signalling the start of the inhibit period. …can effect very fast (<200uSecs) update of operating parameters to any source channel …can stop external triggers reaching any of the four source channels. …can generate external triggers to any of the four source channels internally. …can reset the systems highly accurate quarter millisecond clock. (see note a) …can reset any of the four source channels counters used for timing. …can inhibit any of the four source channels across the internal data bus. …can control the voltage level of any channels pulse outputs. (5v or 9-12v ) …can issue general system timer-counter resets to all four source channels. (see note b)

The four trigger source channels, what can they do ? …can generate 4 pulse outputs A and B, 2 Pulse outputs Each (A and B outputs can be separate) …can generate 4 isolated transistor closures out (four together with A pulses) …can respond instantly to a closure or pulse external trigger. …can respond instantly to a hardware sync from the master channel. …maintains an accurate count of master clock pulses for its own channel timing purposes. …can respond to interrupt driven timing events within 250 nano seconds. …can generate 5v or 9-12V output pulse levels under software control. …can accurately generate varying pulse width and closure width outputs under software control. …can accurately delay B output after A output under software control effecting a source print delay. …can accurately output on B as a function of……… (see note c) 1:) - count of external trigger pulses in 2:) - fixed delay after A on External trigger 3:)- fixed delay after external trig after “n” triggers 4:)- alternate output on A (divide by external trigger event) (sync to source with ext event) (divide+sync external) (toggle fire two sources)

…can accurately delay the first output after a general system timer reset by a fixed delay. ( see note b) …can accurately effect software de-bounce on any external trigger inputs .
note a: The system clock is implemented in an 8pin RISC micro which can be hardware reset by the master channel. Each source channel maintains a timer-counter which can be reset also to effect a complete system timing reset when ever the master clock is also reset. note b: This delay feature allows the relationship of each channels output to be moved slightly in time with respect to the other channels output. note c: All the “FIXED DELAY” periods are user selectable from the PC interface.

SmarT-Trigger 4 Operation handbook
Technical Specifications

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Power Consumption

5v Dc @ 98mA
(Supplied by external 9-12V DC PSU)

Trigger Input Trigger Output

Pulse or Closure inputs for each channel 4 TTL Pulse outputs per channel. 4 Isolated closure outputs per channel, pulse and closure width is selectable

INHIBIT INPUT INHIBIT MODES

Pulse or closure input
Mode 0 Mode 1 No Inhibiting of any channel output (INHIBIT OFF) Strict Busy Period Inhibit In this mode no extra triggers are output during Digital Busy Period Pre-emptive Start Busy Period triggering In this mode only at the start of the busy period is an extra trigger attempted under software control Pre-emptive Start and End Busy period triggering In this mode extra triggers are attempted under software control after the Start and before the End of the digital or master systems busy period

Mode 2

Mode 3

SYNCHRONISATION

Each output Channel can be synchronised to another channel or to the Digital system busy period start or end event. Each channels output can be moved in time relationship with reference to any other channels output, or to an external event. Accepts Data at 19200 8 Data No Parity 1 Stop Tri-Stated Transmit to Host allows other "SmarT"systems to talk on the same serial line to a common PC machine. Re Transmits real time Host Data at input receive parameters extending the RS232 link to another "SmarT" system on the line. By software command via the serial link and the PC interface

RS232 IN

RS232 OUT

SET –UP

SmarT-Trigger 4 Operation handbook
Getting Started
Power Up and Set Up Connect up the 9-12 V PSU to the DC Jack socket at the rear of the unit.

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Connect up the Standard 9 Way serial cable to the serial input connector on the rear panel of the unit. Connect the other end to the PC, Run the SmarT-Trigger 4 PC software. Set the PC Comm Port to use the correct PORT number you wish to use to communicate with SmarT-Trigger. Turning on the SmarT-Trigger 4 interface unit will result in the following display on the front Panel LED's All The EXTERNAL Red LED's will Be lit , and all The INHIBIT Red LED's will be Lit, This is the boot up display for the system , the system has just been powered up. As soon as the PC Program has determined the interface unit has booted, the PC will download a complete Set of working PARAMETERS, these will be default parameters as supplied on the software installation disk. The INTERFACE UNIT should now be showing a STOP Status for all channels i.e. all the EXTRA YELLOW LED's Should be lighting at a rate of 500mSec. If any of the above sequence does not happen then check TROUBLE SHOOTING section Boot Up. Stopping Starting Output Function Keys F1 Control Channel one F2 control Channel two etc. etc.. Pressing F1 once will result in the Channel being turned ON, the GREEN FIRE LED should now be lighting At the firing rate, PULSES will be output from channel 1. Pressing F1 once more will result in the channel going into STANDBY mode where 10 seconds will have added To the output fire rate , the GREEN FIRE LED will now flash at a very slow output fire rate. Pulses will be output From channel one every 10 seconds. Pressing F1 once more will bring the channel back once again to a STOP condition, the YELLOW EXTRA led Will be flashing at the fire rate of 500mSec. No pulses will be output from channel one. Control for the other three channels is affected with Function Keys F2 F3 and F4. Function Keys F5, F6, and F7 will force all channels to a STOP, RUN, and STANDBY condition in that order. This same level of control is also effected with the mouse by clicking on the STATUS Panel as Shown below.

Figure 1: Channel Control and STATUS Panel The RUN STOP STANDBY buttons have the same effect as Function Keys F1 F2 F3 F4 The INT buttons set mode INTERNAL or EXTERNAL , in external the channel will only respond to Input pulses or closures to the channel. The Buttons show the current channel status , pressing them Will advance the channels condition onto the next condition in a RUN - STDBY - STOP - RUN order. Quick Change of Fire Rate. To effect a fast change of the firing rate for any channel , simple click on the Status Panel inside the Black box displaying the rate for a given channel ,and enter a new value , assuming the value entered Is valid (not shorter than the current PRINT DELAY VALUE For the channel) the new value will be acted On immediately .

SmarT-Trigger 4 Operation handbook
Getting Started
Changing Print Delays Each channel provides a trigger to source and a delayed trigger to recorder (PRINT DELAY), the Print delay

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Feature can be turned on of off in the channels set up , but once switched on, the user has instant access to the parameter where the current print delay for any channel can be quickly changed by a single key or mouse click action. Assuming that PRINT DELAY is turned on for a given channel, then that channel will also have a set of LEFT RIGHT arrow buttons for controlling the print delay in 10mSec steps, and also a display panel showing the current print delay value in mSec. These panels appear below the channel status panel on the main screen of the SmarTTrigger 4 PC program As shown Below....

Figure 2: Print Delay control Panel The PRINT DELAY Values are printed in colours that reflect the current Channel STATUS i.e... STOP in RED RUN in GREEN or STANDBY in YELLOW. Clicking on the LEFT ARROWS will decrease the print delay in 10mSec steps while clicking on the RIGHT ARROWS Will increase the print delay in 10mSec steps. The KEYBOARD LEFT ARROW and RIGHT ARROW KEYS will also affect the print delay in a similar manner for the current KEYBOARD ACTIVE Channel, The current KEYBOARD ACTIVE channel is indicated by a GREEN STRIP above the STATUS Button, as can be seen in the Figure 1 on the previous page, channel Number 3 is the current KEYBOARD ACTIVE Channel. It does not matter if a channel is in STOP RUN or STDBY condition , the print delay can be changed With the KEYBOARD or MOUSE And the changes will take affect immediately. Global Control of System As mentioned in the previous page , the user can STOP RUN or STDBY all channels together with single KEYBOARD or MOUSE Clicks. To Control all channels, there is a MENU COMMAND for all three actions as shown below ....

Fig 3:) Run Stop Control Menu's Alternatively the user may simply press F5 or F6 or F7 to effect the same control over the system. The Print Delay , The Fire Rate, INTERNAL or EXTERNAL mode are the only channel parameters that can be changed quickly on the Main screen, in order to affect more detailed changes to any channels set-up , the user must select the CHANNEL SETUP SCREEN , this is achieved by simply pressing F8 or the Menu Command under the SETUP MENU. As there are many parameters that can be set for each channel, these will be discussed in detail, In the next section of the handbook.

SmarT-Trigger 4 Operation handbook
Setting Up The Channels
To set-up a particular channel the user must either press Function Key F8 or select CHANNELS in the Set-up MENU commands. The user will be presented with a panel with all the current settings for the channel, the panel will Normally open with Channel ones settings displayed unless the user has recently changed parameters to another Channel making it the current KEYBOARD ACTIVE channel, in this case the active channels settings will be displayed in the SETTINGS panel.

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The Channel Set-up panel is shown Below

Figure 4:) Channel Set-up Panel Each Channel in SmarT-Trigger 4 is given an IDENT in order to name the channel numbers and give them a More Meaningful title such as PROFILER SONAR BOOMER, etc IDENT By clicking on the IDENT Panel as shown in Figure 4 above it s possible to change the ident for the channel, this ident will be shown in the channel Control and Status Panel.Once saved to disk the channel will Keep this IDENT name. TIME BASE is the firing rate for the channel , clicking on the BLACK BOX where the Current Time Base Is displayed its possible to enter a new value, Values greater than 16380 will be set back to 16000, as 16 seconds Is the maximum that SmarT-Trigger 4 can time. PRINT DELAY is the delay applied to the TRIGGER TO RECORDER OUTPUTS on the interface rear panel, it is only used if the PRINT DELAY Feature for the channel is turned on (see next page ) The value entered can not be greater than the Time Base value for the channel , and must always be greater than 1 mSec. STANDBY is the value in seconds that is added to the Time Base fire rate for the channel when a STDBY condition is set by the user. This value can be 1 to 16 (16 seconds Maximum)

SmarT-Trigger 4 Operation handbook
Setting Up The Channels continued. Reference: Fig 4:) previous page PULSE WIDTH is the value in milliseconds of the width of the closure and pulse outputs for the channel. This value can be 1 to 16 mSec (16 mSec Maximum value)

INHIBIT PERIOD is the individual time in milliseconds for the period of INHIBITING for the channel assuming that the INHIBIT Feature is turned on for the channel , This period can be from 10 mSec to 16 Seconds.

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EARLY START is the period that determines when the channel comes out of INHIBIT MODE, this value must be less than the INHIBIT Period defined for the channel. This parameter is only used if the EARLY START feature of the INHIBIT Mode for the channel is switched on. PULL is the period in which the system can output a LATE FINISH pulse after the inhibit period has started, And this value can be 1 to 64 mSec Max. The parameter is only used if the LATE FINISH feature of the INHIBIT mode for the channel is switched on. See Inhibit details for further information. MESH DELAY is the delay issued before the first pulse is output after a system reset. This parameter is only Used if the MESH DELAY feature of the channel is switched on, the value can be 10 to 2500 mSec. (in steps Of 10mSec only) CHANNEL FEATURES PRINT DELAY ON OFF Clicking on this Check Box will turn on or off the print delay feature for the channel. When switched off the user will have no further screen control of PRINT DELAY for the channel. All outputs for the channel (TRIGGER TO SOURCE and TRIGGER TO RECORDER) will be at the fire rate. When switched on the user will have a means of adjusting the delay about the initial value set in the PRINT DELAY Value box (see Fig 4 previous pages) TRIGGER TO RECODER OUTPUTS will be delayed with respect to TRIGGER TO SOURCE OUTPUTS by the PRINT DELAY TIME period. INHIBIT ON OFF Clicking on this Check Box will turn on or off the INHIBIT Feature for the channel. When turned on the channel will respond to Master channel commands at START OF INHIBIT PERIOD And will also affect other actions depending on the INHIBIT MODE set up, See Inhibit details for further information. HV ON OFF Clicking on this Check Box will turn on or off the HIGH VOLTAGE OUTPUT for the channel. When Turned off the channel will output Pulses at a normal TTL Level, When Turned on the channel will Output Pulses at a level set by the unregulated DC power supply input to the interface unit. EXTERNAL ON OFF Clicking on this Check Box will change the Mode from INTERNAL TO EXTERNAL for The Channel, when set to ON the user will also be presented with an external trigger count set-up as shown below Fig 5:) External Trigger count set-up

The user can enter a value of external trigger count, this value can be set from 1 to 254 ,Giving a divide by "n" function of input triggers. The normal setting for this parameter would be 1. (every Trigger)

SmarT-Trigger 4 Operation handbook
Setting Up The Channels continued.

SYNC EVENT ON OFF Clicking on this Check Box will turn on or off the External Sync Event Feature for the channel. When set to ON, this feature will also force the PRINT DELAY FEATURE ON, However no outputs Will be issued on the TRIGGER TO RECORDER outputs until an external trigger has been received on the external inputs to the channel. This will only be detected after TRIGGER COUNT triggers have been seen by the Channel (normal setting = 1) and then the output on the TRIGGER TO RECORDER outputs will only occur At the PRINT DELAY PERIOD after the next logical output on the channels TRIGGER TO SOURCE Output.

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STANDBY ON OFF Clicking on this Check Box will turn on or off the STDBY feature for the channel , when turned on the Time base output for the channel will be increased by the STANDBY TIME (period in seconds) For the channel, when turned off the Time base period fire rate will return to the normal rate for the channel.

MESH DELAY ON OFF Clicking on this Check Box will turn on or off the MESH DELAY Feature for the channel, When set to ON , the channel will issue a MESH DELAY to the value of the current setting of the MESH DELAY PERIOD when ever the system does a general reset. General Resets are issued after all Channels are forced To a RUN condition , At Boot Up, or after the RESET Button (see Fig 1 Channel Control Status Panel) is pressed. When set to Off the channel will not issue a MESH DELAY and will commence firing immediately at its normal fire rate after a general reset to the system.

RUN ON OFF Clicking on this Check Box will turn on or off the RUN Feature of the channel , which will either set the channels condition to STOP OR RUN (or STDBY if the Standby feature for the channel is also on.)

TEST DROP SHOT Clicking on this Check Box will turn on or off a test facility for the channel where it is possible to set the drop every "n" shots feature for the channel. This facility is to aid in interference minimisation or finding out which output event is causing the most interference with another channel. Entering for example a figure of 5 will result in that channel dropping (not issuing) every fifth output pulse . The possible range of entries for this parameter is from 2 to 15. A Value entry box is provided once this facility is turned on. When turned off the Drop Shot feature is turned off for the channel and all outputs are restored. When ever the Interface box is powered up or the PC is booted this feature is turned off for all channels The Channel set-up Panel Control Buttons

Fig 6:) Set-up Panel Control Buttons SEND BUTTON As soon as the very first parameter for a channels set-up has been changed , the user will notice that the SEND BUTTON as seen if Fig 6 above, will become visible , indicating that parameters have been changed and in order that these changes be acted on, they must now be SENT to the channel. Once the SEND button has been pressed the changes made will be SAVED TO DISK and SENT to the Channel. The SEND BUTTON will then become invisible once more. LAST / NEXT BUTTONS These buttons offer a means of navigating through the four channels set ups. However if a change is made to any channels set up and the SEND BUTTON becomes visible , then pressing the NEXT OR LAST button will prompt the user to discard the changes or not. CLOSE BUTTON Closes the panel down regardless of any changes made to parameters.

SmarT-Trigger 4 Operation handbook
Setting Up The Master Channel To Set up the Master synchronisation channel in the SmarT-Trigger 4interface unit, the user must press F9 Or select the Set-up Menu as shown below....

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Figure 7:) Set-up Menu (Master Channel)

A Master Set-up Panel will appear as shown above .. Figure 8:) Master Set-up Panel There are six parameters that can be sent to the Master Channel for controlling the SmarT-Trigger 4 System. These parameters are all set on the Master Channel Set-up Panel as shown in Figure 8 above. These parameters are passed to the Master channel each time the PC program is booted or when the Master set-up form is used. INHIBIT TIME is the period that all channels set to INHIBIT will be inhibited for (Except if the channels are set to A STRICT Mode of Inhibit see Inhibit Details for further information) SYNC ON INHIBIT is the most important setting in the Master set-up and is discussed in the Inhibit section. Turning on or off this parameter changes the way some INHIBIT parameters are interpreted by the system. SOD TIME is the period to wait after the external trigger has been received by the master channel before sending The START INHIBIT Signal to the slave channels in the interface unit. This time is entered in mSec and can be From 1 to 16000 mSec. It is the time from trigger to Start of Data recording for the Master or critical recording system that is generating the inhibit signal to SmarT-Trigger 4 USE SOD determines if the SOD Time value is to be used or not, in some conditions the signal or trigger to the system may in fact be at Start of Data time and therefore the time delay will not be needed. EDGE DETECT determines if the trigger will be detected on a rising or falling edge of input pulse or closure. Which can be useful if there is a very long input trigger from the inhibit source. EXT TRIGGER COUNT for the master channel should normally be set to every 1 trigger but the facility is there to Divide input triggers as a figure of 1 to 254 can be entered

SmarT-Trigger 4 Operation handbook
Setting Up A Channel For Side Scan Its possible with SmarT-Trigger 4 to define one channel as the SONAR UNIT or the Side Scan Channel. In this way its possible to run a Side scan sonar unit from this channel and for the user to Work in Meters For the range Rather than in Milliseconds for the Time Base. The user Must select Menu Command set-up SONAR UNIT and enter the number for the channel to be used The user will also be asked for a Side Scan Range , however if no range is given the system will default to the last Range that was used for a defined sonar unit previously. Once this action has been completed the selected channel will have its time base period set to the appropriate value for the current Sonar Range which will be displayed in meters in the Channel Status Panel as shown below.

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Figure 9:) Side Scan Sonar Display The Normal INTERNAL EXTERNAL Mode Change Button is replaced by a set of Range UP DOWN Buttons. These Side Scan Range change buttons can only be accessed by the mouse, they increase or decrease the side scan range by 50 metres. If attempts are later made to edit this channels time base period in the Channel Set-up panel the user is warned that the SONAR UNIT DEFINITION must be turned off, only the range change buttons can affect this channels time base period once its set to be the SONAR UNIT. Pressing F2 in the case of the channel displayed in Figure 9 above will result in only RUN STOP conditions , there is no STDBY condition valid for a Sonar unit. To End the SONAR UNIT Definition and return the channel to normal operation , the user must select the same Menu command Menu SETUP where a new menu will have become enabled since turning on the sonar definition , this menu is called KILL SONAR , clicking on this menu will return the channel to normal operation. ___________________________

Saving and restoring System Set-ups
In order to save the current set-up to disk for later recall or to load in a previously saved set-up there are two menu commands under the file menu as shown below

Figure 10:) Load Save Set-up Menu The Load Set-up looks for a group of files saved as *.TRG Files in the default installation location for the application. Once selected the system shuts down and the user must re boot the program, the system will then be set up as per the new set-up file, each set-up file should have a user applied Title to go with the set-up , this title or description of the set-up will be present on the applications caption title bar as can be seen in figure 10 the set-up in use is titled "Single pass". Save SETUP menu allows the current configuration to be saved along with a title , this file will be saved as A *.TRG file , the current configuration will still be valid but should the configuration be changed at some time in the Future the original configuration can be recalled by loading it in with the LOAD SETUP menu command.

SmarT-Trigger 4 Operation handbook
How inhibiting works An Overview The inhibit feature of the SmarT-Trigger 4 is quite simple in operation , there are a few options and parameters that can be changed in order to affect the way the inhibiting will work on individual channels, but in general the operation is simple. Its important for the user however to fully understand all of the parameters and how they affect the operation of the system. When an external trigger is applied to the master or Synchronisation channel ( A pulse or a closure input) The master channel will send a message across the fast internal data bus to all slave channels that the start of the inhibiting period Has occurred and that all channels that have their INHIBIT FEATURE turned on , should now start to inhibit their outputs. What each channel actually does at or just after the inhibit period starts is down to each of their individual INHIBIT MODE PARAMETERS , this will be discussed in detail later. But fundamentally INHIBIT PERIOD STARTS for all Channels at exactly the same time.

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The Master channel times the full length of the INHIBIT PERIOD as set in the master control parameters. All timing within the system is done with a common to all channels highly accurate 1/4 mSec clock . At the end of the inhibit period the Master channel signals this condition across the fast internal data bus. Some channels will respond to this signal, others may have by way of their settings established a much longer Or indeed shorter inhibit period , but again we will go into details later. The Main Job of the Master Channel is to Signal the start and end of the inhibit period to all the slaves. Its job is also to time the correct delay from the actual trigger received to the correct time actual inhibiting should start. (START OF DATA DELAY) Now let us look at the INHIBIT MODE Parameters for each slave channel in more detail Firstly the most crucial setting for the master channel is SYNC ON INHIBIT setting and this Determines how the slaves interpret the inhibit Start and END events. If SYNC ON INHIBIT is set to on , then the slaves will attempt to get shots fired at or before the end of the inhibit period and by so doing destroy any precise timing relationship that was first established between the channels as a function of the MESH DELAYS that were applied at general reset (system boot or all channels set to RUN) If SYNC ON INHIBIT is set to off, then the slaves will interpret the LATE FINISH and EARLY START Parameters In a different way assuming they are in fact turned on . But no matter what happens the precise timing relationship set between the firing of all the channels will be maintained. It can be said that SYNC ON INHIBIT ON would be the way to extract the very most from a channel which had to be inhibited , but at the cost of possible cross channel interference , however in some cases this may not be the case.

In the next section of the handbook we will look at the operation of all the INHIBIT Parameters as they operate with the Sync ON INHIBIT parameter set to ON or OFF.

SmarT-Trigger 4 Operation handbook
Inhibit Detailed operation LATE FINISH and PULL ( SYNC ON INHIBIT Turned Off ) Late finish is the ability of any slave channel to decide on outputting an extra fire pulse after the actual start of Inhibiting has taken place. Late finish can only happen when the user has supplied a suitable value of PULL Parameter. The PULL parameter is the time in Milliseconds after INHIBIT START that an extra shot can be allowed for that channel. Example INHIBIT START has occurred for channel 2 and it has a PULL of 45 mSec The channel itself detects that there is another 34 mSec to its next logical fire output, in this case if LATE FINISH Is set to ON then an extra Shot would be issued 34mSec after start of Inhibiting has taken place. This extra shot would be flagged on the front panel LED's for that channel as INHIBIT LED ON , and the FIRE and EXTRA LED's on together For that extra shot. LATE FINISH and PULL (SYNC ON INHIBIT Turned On ) Late finish is the ability of any slave channel to decide on outputting an extra fire pulse at the actual start of Inhibiting .Late finish can only happen when the user has supplied a suitable value of PULL

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Parameter. The PULL parameter is the time in Milliseconds by which the time base of the particular channel can be shortened in order to output a faster pulse for that channel. Example INHIBIT START has occurred for channel 2 and it has a PULL of 45 mSec The channel itself detects that there is another 34 mSec to its next logical fire output, in this case if LATE FINISH Is set to ON ,then an extra Shot would be issued at the start of Inhibit. This would result in a shortened time base for that channel on this extra shot of 34 mSec, Say the normal rate was 200 mSec , then the extra shot would have occurred 166mSec after the previous shot. This extra shot would be flagged on the front panel LED's for that channel as INHIBIT LED ON, and the FIRE and EXTRA LED's on together For the shot. It can be seen from these two definitions for LATE FINISH and PULL Parameters that they have quite different meanings depending on how the Master channel has been set up. SYNC on INHIBIT On or OFF. SYNC on inhibit is the most important setting for the whole system, its important this fact is understood and appreciated by all operators of the SmarT-Trigger 4 system.

EARLY START (SYNC ON INHIBIT Turned off) Early Start is a period of time (shorter than the INHIBIT Period for the channel) after which the channel will attempt to output shots. The Time base of the channel has not been affected when INHIBIT STARTED and each time the timer for that channel times out during inhibit period the channel is checking to see if the next shot will fall outside The period of EARLY START, if such a condition is detected then a logical fire output pulse will be issued but of course this pulse will be an EXTRA pulse as it comes before the end of the inhibit period. The slave channel will take off the INHIBIT Status on its front panel LED when it receives the "End Inhibit" signal across the data bus from the Master channel. EARLY START (SYNC ON INHIBIT Turned on) Early Start is a period of time (shorter than the INHIBIT Period for the channel) at which the channel will fire an output shot. The time base will be reset about this new time and there after output pulses at its normal rate starting with this first EXTRA Early Start Shot. This EXTRA Shot will be flagged as an EXTRA Shot on the front Panel of the interface unit. The Slave channel will take off the INHIBIT Status on its front panel LED when it receives the "End Inhibit" signal across the data bus from the Master channel. STRICT INHIBIT (SYNC ON INHIBIT Turned off) When a slave channel has STRICT inhibit set on , then LATE and EARLY are overridden, with STRICT Inhibit The channel will not issue a shot at or after inhibit start, The channel will only allow logical outputs after Inhibit End. The Period of STRICT Inhibit is set by the INHIBIT PERIOD for each individual channel. STRICT INHIBIT (SYNC ON INHIBIT Turned on) When a slave channel has STRICT inhibit set on , then LATE and EARLY are overridden, with STRICT Inhibit The channel will not issue a shot at or after inhibit start, The channel will issue a shot at Inhibit End and its time base will be synced at this point .The Period of STRICT Inhibit is set by the INHIBIT PERIOD for each individual channel.

SmarT-Trigger 4 Operation handbook
Mesh Delays and synchronising outputs SmarT-Trigger 4 brings together for the first time in one system all a survey vessels source triggering requirements . As all channels are timed from a highly accurate common quarter mSec clock its possible to get not only accurately synchronised outputs at a precise timing relationship to each other, but also to maintain this precise relationship over a very long period of time without the need for frequent system timer resets. No matter what the time base period of any two channels are first set to, when the system forces all channels to a RUN condition , and assuming no mesh delays are applied , the very first output pulses from all channels will be exactly in sync. Then depending on the time base relationship, successive shots may or may not be in sync. By selecting time base periods that can first be synchronised, we can then make use of the MESH DELAY feature of SmarT-Trigger 4 to affect some degree of interference control over all the sources being fired.

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For A start point one must assume that we can for example select fire rates of 125mSec 250msec 375mSec 500mSec etc .etc as choosing firing rates other than multiples of one another will not be capable of being synchronised by the firing controller. Uneven or badly ordered firing rates will..... ALLWAYS CREATE INTERFERENCE However assuming we can for the majority of the sources select what are termed as "MESHABLE" rates then SmarT-Trigger 4 can give the user precise control over where each source trigger appears in relationship to the other triggers and in so doing give an effective interference reduction tool wherever multiple sources are being fired. If we take an example of 250mSec and 500mSec firing rates applied to two channels. Without MESH delays applied these channels would always be firing exactly at the same time on every second fire from the channel set to 250mSec. This may not be an ideal situation with regard these two sources interfering with one another. By applying a MESH DELAY of 120mSec to the channel that is firing at 250mSec we create a situation where there is always at least 120mSec clear between any one fire at 500mSEc rate and the channel firing at 250mSec rate. In order to help the operator appreciate and to see the affect of removing or adding mesh delays to any firing situation , the system provides a graphic representation of the fire output of the system with and without mesh delays applied. This display feature of the system is accessed under the menu command HARDWARE Show Firing as shown below .

Figure 11:) Show Firing Menu Command

The next page shows the graphic display form that comes up under the above menu command.

SmarT-Trigger 4 Operation handbook
Mesh Delays and synchronising outputs

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Figure 12:) Graphic Display Panel for Mesh Delay Display The graphic display has two display panels , the top panel will display all channels that are currently set to a RUN condition at their rate , and the bottom panel will display the same only with the mesh delays applied. The individual channels fire output displays can be turned on or off by clicking on the channel number labels, ch3 and ch4 are set to off for the purposes of this particular display. Channel 1 in RED has the 500mSEc time base rate applied and channel 2 in GREEN has the 250mSec rate, the top panel shows how the outputs would look if there were no mesh delays applied and the bottom panel shows the actual situation with a mesh delay of 120mSec applied to channel 2 . Other features of this Graphic display panel are that if Drop Shots are slected for any channel they can also be represented in this graphic display. The Scale along the top is that of Channel 2 , but by turning off and then on channel 1 , the scale along the top of the display will be for channel 1.

SYNCHRONISING TO EXTERNAL EVENTS
When the Time base period of a particular channel is not a "MESHABLE" time period , such as would be the case for the time base period normally applied to a side scan sonar for example , Its still possible to prevent other sources interfering with the Sonar Channel. By using the SYNC EVENT feature of any channel , its possible to arrange that a known interfering source is actually fired from the same channel in SmarT-Trigger 4 that is firing the source that is being interfered with. Once a trigger for the interfering source can be obtained from some other system, this trigger should be applied to the external trigger input of the Sonar channel and the SYNC EVENT feature should be turned on for the sonar channel. The Trigger to source for the interfering source will now be available on the TRIGGER TO RECORDER output From the sonar channel. Setting the Print Delay period for the sonar channel will move the occurrence of the interfering source with respect to the Sonar sweep time. This method will only work satisfactorily when the interfering source is being fired much more slowly than the source that is being interfered with. However when the reverse is the case , then the faster interfering source should also have its fire output applied to the external trigger input of another channel with that channels trigger Count set to some divide by "n" figure (2, 3, 4, etc), in this way its possible to get exact sub multiples of the faster interfering source trigger to be applied to the slower source that is being interfered with.

SmarT-Trigger 4 Operation handbook
Removing worst case Interference.

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As with most situations where multiple sources are interfering with one another, its often possible to find that no matter how you fire a particular system with respect to another, they always interfere with one another. This can be for reasons of water depth or sea bed conditions.

Assuming that by using mesh delays on SmarT-Trigger 4 the user has created a single area of sweep time for the interfered with source where there is no occurrence of the interfering source, but they are still interfering .

There is still one very powerful tool at the users disposal with SmarT-Trigger 4, its possible to knock out or drop Every "n" Th. shot for a particular channel. In shallow water conditions its often the second or third sweep of a particular system where the interfering source is getting in.

Assuming the slower source is causing interference on the faster firing system, The user could select to drop Every 4th, 5th or 6th shot from the slower source.

Rather than get into complex calculations with respect to Second third and fourth sweeps for a given system in a given water depth , the SmarT-Trigger 4 system gives The engineer a very fast TRY IT AND SEE approach.

The Graphic display of the firing out put as described previously may help in at least appreciating what dropping the "n" Th. shot from a particular channel will look like in the output from the system. This display will also show the situation with and without dropped shots.

SmarT-Trigger 4 Operation handbook
System installation. SmarT-trigger 4 Operational software comes on one installation Disk. The System should be installed On any windows 3.1/Win 95 machine by the standard windows installation procedures.

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The system will install standard SET-UP files for the smart trigger unit, these set-up files are stored in the default installation path on the users machine. The set-up files are files with a *.TRG , the installation software will also install an INI file in the root directory of the users PC hard disk. This file stores the SmarT-Trigger Path information for the machine. Four Separate EXE files are installed by the installation Software. SIM4.EXE SMART4.EXE TRIG4.EXE SMARTT.EXE SmarT-Tator 4 Simulator software (Runs SmarT-Tator 4 on its own) SmarT-Tator 4 operation software (Runs SmarT-Tator 4 on its own) SmarT-Trigger 4 operation software (Runs SmarT-Trigger 4 on its own ) Joint Tator 4 Trigger 4 operating software (Runs both systems together) JOINT SYSTEM OPERATION If joint system operation is required then the SmarT-Tator unit should be connected first in line from the PC on the serial Line, The serial output from the Tator4 system should be connected to the serial Input of the SmarT-Trigger 4 system. Joint System operation will only work with this configuration. SMARTT.EXE is the operating program to use in this dual system configuration. The SmarT-Trigger control software runs behind the SmarT-Tator control screen software , the unit is run from a menu on the SmarT-Tator control screen, once this menu is selected the Trigger control screen is visible and setup and control Is achieved from within this control screen. Once SmarT-Trigger system has been initialised and set up, then the Trigger control screen can be minimised and further routine control of the system can be achieved from a small mimic control Panel display for SmarT-Trigger within the SmarT-Tator operating screen. Once this mimic control panel is visible , The SmarT-Trigger Control program is running in the background, and the SmarT-Trigger system can be controlled from this control panel.

Figure 13:) Trigger Mimic Control Panel The mimic control panel on the SmarT-Tator screen will satisfy most online control requirements for the smarttrigger system , however if particular channels require detailed set-up changes, then the trigger application itself must be brought up and the set-up changes made from there. The SmarT-Trigger 4 portion of the joint system program can be shut down , and can be re started at a later time from the menu command within the SmarT-Tator control screen, but if the SmarT-Tator 4 program is shut down , this shuts the whole program down. The SmarT-Trigger control screen can be minimised and if This is done the SmarT-Tator screen comes back up, and if the SmarT-Tator 4 screen is minimised and if SmarT-Trigger is running in the background, then the SmarT-Trigger control screen will come up. This dual program action gives quick and easy access to both trigger channels control and set ups and also to the remote channels of the SmarT-Tator unit.

SmarT-Trigger 4 Operation handbook 19 inch Rack Mount Unit

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Fig 14:) System Block Diagram

Above is the System BLOCK DIAGRAM , it shows the outputs of each slave channel and the control and data lines used by the master channel to control the slave channels

SmarT-Trigger 4 Operation handbook The Rear Panel Connections

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Fig 15:) Rear Panel channel connections Each channel has four output pulses at the Top Trigger to Source Top Left Two BNC Sockets Trigger to Recorder Top Right Two BNC Sockets Each Channel has two input trigger connections External Pulse Middle Left BNC socket External Closure Middle Right BNC Socket Each Channel has four output closures Bottom four BNC Sockets MASTER CONTROL POWER AND SERIAL CONNECTIONS

Fig 16:) Master Control connections RS232 Input is the serial Link to the PC from either the PC direct or via SmarT-Tator 4 in a dual system installation. 9-12VDc Input power jack , Any DC Supply less than 28V can be used (At least 100mA capability) High Voltage Pulse outputs are at the DC supply Voltage. Tip is positive , system is diode protected. The Master channel has an external PULSE or Closure input BNC Socket, connected to trigger from the master System to indicate the start of the Inhibit period.

SmarT-Trigger 4 Operation handbook Front Panel LED Display

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Fig 17:) Front Panel LED Display Sequence There are four LED's per channel , External LED RED indicates the system is in External mode and is being fired by external pulse or closure inputs to that channel. When the channel is being triggered the EXTERNAL Led should flash with the FIRE LED When the EXTERNAL LED is on all the time on its own indicates the system is in external mode and waiting for its first external trigger. Fire LED GREEN Indicates the channel is firing at the time base rate for that channel Inhibit LED RED Indicates the channel is in INHIBIT period Extra LED YELLOW Indicates the channel is in the OFF condition when flashing on its own and no triggers Are output from the channel. Also when flashes with the FIRE led and the INHIBIT light is on that the channel has issued an EXTRA Shot.

SmarT-Trigger 4 Operation handbook Trouble shooting
Bootup The SmarT-Trigger 4 Interface unit sends two attention request characters at boot to the PC system. The System should then have its entire set-up downloaded to the interface unit by the PC. If this does not happen for any reason. Its best to first Test the communications link with the Control Program Itself.

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Under the Menu Command HARDWARE there are two Test Menu commands TEST SLAVE Channels And TEST MASTER Channel, with the TEST MASTER menu command , a small extra test panel will become available where its possible to send an interrogation character to the Interface unit to test the serial link Between the PC and the interface unit . This Test should always result in the Unit reporting a SMART-TRIGGER RESET condition in the PC program when a floating message box will appear with this status displayed.

Fig :18) Master Channel Test Hardware The BAD CHAR Button will always reply with a Floating message display indicating that a BAD CHARACTER Was sent to the Interface unit. Clicking On the menu HARDWARE TEST MASTER CHANNEL will remove this extra test panel. Its important to note that while checking the serial lines to and from the Interface unit, that the Transmit line From the Interface unit will only have valid RS232 levels at the exact moment of transmission as its a normally Tri-stated Port and is only enabled for transmit to the PC. The cable between the PC and the SmarT-Trigger unit should be a standard 1 to 1 cable. This also applies if the SmarT-Trigger is connected to the RS232 output of a SmarT-Tator 4 system. Slave channel outputs and LED's Under the HARDWARE menu mentioned above , the user should click on the TEST SLAVE CHANNELS menu command and another small test panel will become available for testing the Slave channels I/O. For these tests communication is established, and the channel with which there appears to be a problem with, Is made the current active channel , by clicking on its Function Key F1 F2 F3 or F4 to force it to a RUN STOP Or STANDBY condition.

Fig: 19) Slave Test Hardware The LEDS ON LEDS OFF Buttons will turn on and off all the Front panel LED's for the current active channel , enabling a confidence check to be made on all that channels front panel LED's. Spare LED's can be found in the Spares KIT.( these LED's are cut with a Short Lead indicating the Cathode) The LED's used in SmarT-Trigger 4 are very low current LED's and should only fail in very rare conditions. Where concern is regarding the PULSE or CLOSURE I/O from a particular channel then the PULSE ON PULSE OFF Buttons will toggle the A and B outputs as well as the four closures for the channel so confidence Checks can be made with an AVO connected to the relevant outputs at the rear panel. OutPut Failure If for any reason an output from a particular channel fails , changing the output driver chip is a simple task. Remove the Top cover of the interface unit , locate the channel concerned (looking into unit from the front Panel Channel 1 is the second PCB from the LEFT , channel four is the PCB on the far Right hand side)

SmarT-Trigger 4 Operation handbook Trouble shooting
OutPut Failure Changing out a Driver Chip Locate the 20 Way Ribbon connector which connects the particular channels PCB to the Various I/O connectors on the rear panel. IC1 is the Four Closure output Chip , this IC can be seen in Front of the 20 Way ribbon connector PL1 , The Four Pulse Output Chip is IC2 , which is on the far side of PL1 and it will

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be necessary to remove the ribbon connector to get access to IC2 . NB Note the PCB orientation of both IC1 and IC2 , Replace IC2 For Four Pulse Output problems , and IC1 for problems with closure Outputs.

Fig :20) Driver Chip PCB Layout Both IC1 and IC2 are identical four transistor Opto Drivers and are readily available from Radio Spares As Part ISQ74 Part number 307-064, there are several chips provided in the systems Spares Kit. System Clock Failure In the event of a system clock failure , the symptoms of which will be as follows , The system powers up and Is downloaded with the parameters , but immediately after this action the PC warns of a system CLOCK FAILURE with a floating Message box display. All LED's will go out and stay out, The main system clock is generated by an 8 Pin RISC Micro device which is located on Channel one PCB to the left hand side of the Ribbon connector that connects channel one PCB to its Front panel LED's. The system spares kit contains a replacement 1/4 mSec clock generator (PIC I2C508) This device is an EPROM device and should have a window cover attached with its version number of software. Locate channel one PCB the second PCB from the left hand side looking into the interface unit from the Front panel, remove the Micro Device IC7 and replace with system spare unit.

Fig :21) System Clock Generator PCB Layout

Power Supply Problems The System is powered from a standard AC wall adapter type DC power supply , the entire system is diode protected with a single 1N4001 Diode fitted at the DC power Jack on the rear panel. A spare diode 1N4001 will be found in the spares kit. The Next section of Trouble shooting deals with problems that may be experienced with the 9-12V dc power supply.

SmarT-Trigger 4 Operation handbook Trouble shooting

Power Supply Problems

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The 9-12 Volt Dc Power supply is common to all cards within the system. There are Six printed Circuit cards Far left hand Bulkhead is the Serial interface card which receives its 9V supply directly from the Master Card Which in turn receives its 9V supply directly from the ON/OFF Switch. The remaining Slave cards also have their supply fed from the Master card via the main control Ribbon cable which connects from card to card in the system. Below is a simplified layout diagram of the power connections in the SmarT-Trigger 4 system

Fig:22) Power Supply block Diagram It can be seen from the diagram above that each card has its own 5V regulator these regulators are standard 100mAmp 78L05ACP (Motorola part) , Spare regulators will be found in the Spares Kit. A problem on any one card will drag down the entire 9V supply , so its a case of first disconnecting all the slaves at The Slave output Connector PL2 connector to the BUS on the Master channel. If a regulator does fail and needs to be changed, the 5V Regulator on both the Master and Slave cards can be found above PL2 the BUS ribbon connector and is idented "7805" on the silkscreen.

Further Information Further troubleshooting information can be obtained from Rovtec Systems web site at http://indigo.ie/~rovtec Where the latest updated versions of all the current Rovtec Systems handbooks can be obtained. Or by email requests to rovtec@indigo.ie

Rovtec Systems. (May 1998) Ford De Fyne Naul Co Dublin Ireland. Fax 353-1-8413868 email rovtec@indigo.ie Embedded Control Solutions For The High Resolution Survey Industry


				
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