COM Port                                Modem

   DB-9 Socket                            DB-25 Plug___

Pin   Function                       Function            Pin

2      Receive                        Receive              3

3      Transmit                       Transmit             2

5      Signal Ground              Signal Ground    7

      COM Port                               Modem

   DB-25 Socket                         DB-25  Plug      

Pin   Function                       Function            Pin

2      Transmit                       Transmit              2

3      Receive                         Receive              3

7      Signal Ground              Signal Ground     7

Cable: Modem to Modem 

  +R     ---------------    +T

   -R     ---------------     -T

  +T      ---------------   +R

   -T     ---------------     -R

Testing Modem Connection 

1. Connect modem to computer and machine.

2. Plug modem into 115 VAC.  Front panel LEDs (TD and RD) on  modem should be green.

3. Turn on computer and machine.  Start CSSDNC Server.

4. Send Operator Message.  LEDs on modem should quickly blink Red