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Quick Start Guide Short Haul Modem

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					Telebyte 209 Short Haul Modem




                                                                                     Quick Start Guide
This document provides installation instructions for the Telebyte 209 Short Haul
Modem. This short haul modem can be used to assist in long-distance, direct-
connect host computer to PXL-250 access control network connections. The
Telebyte 209 is fully compatible with PC/AT serial communication ports and
requires no external power for its operation.


Specifications
Dimensions
     0.85 inches High x 1.30 inches Wide x 3.00 inches Long
     (2.16 cm H x 3.30 cm W x 7.62 cm L)

Connector
     DB-9F with screw connection terminals

Cable Run Distance
      using Belden 9502 or its equivalent

           Data Rate (KBPS)                  Wire Gauge
                                    19           24             26
               9600 Baud         4.9 Miles    3.1 Miles      1.8 Miles

                Table 1 – Cable Run Distances per Wire Gauge




                                                                                     Short Haul Modem




                           1530 Old Oakland Road, Suite 100                 01850-001 Rev. B
                           San Jose, CA 95112 USA
                           (800) 260-5265 (408) 451-2520 FAX (408) 441-0309       Page 1 of 5
                                         Telebyte 209 Short Haul Modem
                    Installation
Quick Start Guide
                    The short haul modems are shipped in pairs. One modem is attached to the PXL-
                    250 master controller on the access control network. The other is attached to the
                    host computer's COM port.

                    Connecting to the Controller
                         • The DB-9 connector on the modem and the controller are both female.
                             To make the modem to controller connection a DB-9 male-to-male
                             connector is provided (see Figure 1). Set the switch on the modem to
                             the DTE position.




                                                                               MODEL 209FT
                                                            DTE DCE TELEBYTE




                                                                                             Short-Haul
                                                                                              Modem




                                                                                                DB-9
                                                                                             Male to Male
                                                                                              Connector
Short Haul Modem




                                                       PXL-250 Controller




                                      Figure 1 – Controller to Modem Connection




                                    1530 Old Oakland Road, Suite 100                 01850-001 Rev. B
                                    San Jose, CA 95112 USA
                                    (800) 260-5265 (408) 451-2520 FAX (408) 441-0309       Page 2 of 5
Telebyte 209 Short Haul Modem
Connecting to the Host Computer
     • If the host computer's COM port uses a DB-25 connector a DB-25 to




                                                                                            Quick Start Guide
         DB-9 reduction plug must be used.

      •   If the reduction plug uses a "straight-through" connection (pins 2 and 3
          on the 25 pin side go straight through pins 2 and 3 on the 9 pin side)
          set the switch on the modem to the DCE position (see Figure 2).




                                       DTE DCE TELEBYTE


                                                          MODEL 209FT
                                                                        Short-Haul
                                                                         Modem




                                                                          DB-25 to DB-9
                                                                         Straight-Through
                                                                            Connector




                                                                                            Short Haul Modem
                                    Host Computer




                Figure 2 – Host Computer to Modem Connection
                        Straight-Through Reduction Plug




                           1530 Old Oakland Road, Suite 100                 01850-001 Rev. B
                           San Jose, CA 95112 USA
                           (800) 260-5265 (408) 451-2520 FAX (408) 441-0309       Page 3 of 5
                                          Telebyte 209 Short Haul Modem
                          •   If the reduction plug uses a "2-3 twisted" connection (pin 2 on the 25
Quick Start Guide
                              pin side goes to pin 3 on the 9 pin side and pin 3 on the 25 pin side
                              goes to pin 2 on the 9 pin side) set the switch on the modem to the
                              DTE position (see Figure 3).




                                                           DTE DCE TELEBYTE


                                                                              MODEL 209FT
                                                                                            Short-Haul
                                                                                             Modem




                                                                                              DB-25 to DB-9
                                                                                                2-3 Twist
                                                                                               Connector




                                                        Host Computer
Short Haul Modem




                                    Figure 3 – Host Computer to Modem Connection
                                               2-3 Twisted Reduction Plug


                    NOTE: Each modem has a small switch allowing the modem to be set for use
                    with either DTE or DCE devices. Please ensure that each modem's switch is set
                    correctly. The position of the slot in the switch does not correspond to the
                    DTE/DCE position setting. Insert a thin-blade screwdriver into the switch slot and
                    verify the switch is turned completely counter-clockwise for a DTE application or
                    verify the switch is turned completely clockwise for a DCE application.



                                     1530 Old Oakland Road, Suite 100                 01850-001 Rev. B
                                     San Jose, CA 95112 USA
                                     (800) 260-5265 (408) 451-2520 FAX (408) 441-0309       Page 4 of 5
Telebyte 209 Short Haul Modem
Modem to Modem Wiring
     • Two sets of twisted pair cables are used to connect the modems.




                                                                                  Quick Start Guide
        Connect the cable between the two modems as shown in Figure 4.
        The shield wire is not connected at either end of the cable.




            DTE DCE   TELEBYTE               R+
                                             T-
                                             T+
                                             R-
              MODEL 209FT

                                     1 Twisted
                                        Pair


                                                              1 Twisted
                                                                 Pair


            DTE DCE   TELEBYTE               R+
                                             T-
                                             T+
                                             R-
              MODEL 209FT




                                                                                  Short Haul Modem
                Figure 4 – Modem to Modem Wiring Diagram




                        1530 Old Oakland Road, Suite 100                 01850-001 Rev. B
                        San Jose, CA 95112 USA
                        (800) 260-5265 (408) 451-2520 FAX (408) 441-0309       Page 5 of 5

				
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