RTcom Radio Modems Bedienungsanleitung PDF herunterladen (Seite 13)

Data and Power cont'd :

Pin number Designation WRT Modem Notes

1 DCD Optional not

normally needed

2 RX (data) RS232 input data to

modem

3 TX (data) RS232 output data

from modem

4 RTS Optional not normally

needed

5 GND Ground

6 B = RX (-) RS485 / RS422

7 A = RX (+) “

8 +Vs Supply 7.5 to 15V dc

9 N/C No Connection

10 GND Ground

11 Z = TX (-) RS485/RS422

12 Y = TX (+) “

13 +Vs Optional supply

connection

14 GND Optional

15 +Vs Optional supply

connection

Tab. 3 : Connection for the Universal & Plastic Housed Global Modem

NB. with RS422 & RS485 connections, it is the responsibility of the system builder to ensure that the

connections are correctly terminated. Normally, cables with an impedance of greater than 100 Ohms

should be used and terminating resistors (120R between A-B and Z-Y) may also be required.

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RTcom Radio Modems Bedienungsanleitung Seite 13