For BDX Signs
GSM Monitor for BDX Signs is designed to monitor and report the operating status of BDX Scrolling signs
via SMS (Short Message Service) of GSM cellular network.
A GSM Monitor services up to two BDX scrolling systems, i.e. a double-sided BDX scrolling sign requires
only one GSM Monitor.
The GSM Monitor can be installed inside BDX scrolling sign. The wiring is as follows.
Power control connected to the main power of the Scrolling system, e.g.
(Cont and Gnd) the 24V DC for SPDE.
Power power supply of the GSM Monitor. Typically connected to
(Pwr and Gnd) the battery of the POPS (Power Off Post Settling) is POPS
Side A connector: connected to synchronisation port of the scrolling system.
Side B connector: connected to synchronisation port of the other scrolling
system in a double-sided sign.
Side A indicator: status indicator of the scrolling system.
Side B indicator: status indicator of the other scrolling system in a double-
SIM CARD slot: slot with a SIM card holder for installing the GSM SIM
Eject button: push to eject the SIM card holder.
GSM indicators: indicators for the GSM network connection
MCU indicators: operation status of the GSM Monitor
The GSM Monitor is shipped with an antenna with an elbow SMA connector. The antenna
socket is wired from the GSM monitor box, and recommended to be fitted on side of the
scrolling sign. Please install the antenna before using the GSM Monitor.
Installing SIM card
GSM Monitor requires a GSM SIM card to operate. Before installing the SIM card, please test it on a GSM
cellular phone and make sure the SIM card is activated, SMS-enabled
and not PIN protected.
To install the SIM card:
Turn off the GSM Monitor;
Press Eject button to take out the SIM card holder;
Place the SIM card on the holder;
Push the holder fully back in the original position.
Testing the GSM Monitor
After installing the SIM card, turn on the GSM Monitor. The red GSM indicator will be on and the green
one blinking. This should last approximately 10 to 15 seconds before the red indicator goes off and the
green one starts blinking at a 3 second interval.
If the red indicator stays on, it means the GSM Monitor is not successfully connected to the cellular
network. Please make sure:
Cellular network is available and the SIM card is activated;
The antenna is properly installed.
Programming the GSM Monitor
The GSM Monitor can be programmed via SMS. Simply use a cellular phone to sent command(s) followed
by parameters to the GSM Monitor.
Command Descriptions Parameter and restriction
Set the dialing number Phone number of 6 to 15 digits. No other characters or
Set the sign identifier ID comprising 4 to 15 alphameric (letters or number)
characters. No symbols, punctuation marks or space.
Mode Set the reporting mode 0 to 7
Report Request status report Parameter not required
Multiple commands delimited by space, comma or semicolon can be sent in one single text message. Both
upper and lower cases are acceptable.
1. Single command 2. Multiple command 3. Invalid command
Base 87654321 ID BDXSign01; ID A-001
The GSM Monitor will send back a text message to every received text message as acknowledgement.
1. 2. 3.
*SPDE001* *SPDE001* *SPDE001*
is turned on. Status=Side is turned off.
Current mode=2 A:OK / Side
A:OK / Side
GSM Monitor supports 7 reporting modes:
Mode Report triggers
0 User request
1 User request, scrolling system error and recovery from error
2 Same as 1, plus, power turned on, power turned off
3 Same as mode 2, plus lapse of every 1 hour
4 Same as mode 2, plus lapse of every 2 hours
5 Same as mode 2, plus lapse of every 4 hours
6 Same as mode 2, plus lapse of every 8 hours
* Power off reporting only possible when POPS (Power Off Poster Settling) option is fitted.
1. 2. 3.
*Unnamed unit* *Unnamed unit* *BDXSign001*
New Dialing New ID Invalid new ID
=87654321 New dialing
A:OK / Side
Conditions Red Green
Starting up Note Flashes every 2 seconds for 20 seconds Flashes briefly every second
Standing by Off Flashed briefly every second
Transceiving On for up to 2 seconds Flashed briefly every second
Shutting down Flashes rapidly for 5 seconds Flashed briefly every second
Fatal error Flashes alternately with the green one Flashes alternately with the red one
Note: If the red indicator stays on when starting up, it is indicated that dialing number has not been set up yet. Automatic
reporting will not work until valid dialing number is set by the “Base” command.
Conditions Red Green
Searching for network On Flashes every second
Standing by Off Flashed briefly every 3 seconds
Transceiving On for up to 3 seconds Flashed briefly every 3 seconds
Error On Off
Side A / Side B indicator
Starting up Flashes every 2 seconds for 5 seconds
Scrolling system normal Flashed briefly every second
Scrolling system error On
OK The scrolling system is operating normally.
OK7 The scrolling system is in set-up mode or manual scrolling mode.
Error0 The scrolling system has stopped due to problem with the scroll end sensors.
Error1 The scrolling system has stopped due to problem with both upper and lower rollers.
Error2 The scrolling system has stopped due to problem with the upper rollers.
Error3 The scrolling system has stopped due to problem with the lower rollers.
Error4 The scrolling system has stopped due to unidentified movement problem.
Error5 Fatal error inside the GSM Monitor.
Off The scrolling system is not operating.
Unknown Unidentifiable conditions.
For further information and support, please contact