RTcom Radio Modems Bedienungsanleitung PDF herunterladen (Seite 12)

CONNECTIONS

Data and Power :

Data connections should always be made using screened cable. This will ensure maximum rejection of

interference from outside interfering sources. Always use a common ground point.

The RTcom Global, Europa and Outback modems support RS232, RS422 and RS485

communications, both 2 and 4 wire. The RS232 port should be used for short cable runs of up to 10m and

the RS422 and RS485 can be used for extended distances. The modems support various data rates from

1200 to 9600bps depending upon version. All units support 7- and 8- bit ASCII data with even or odd parity

and 1 or 2 stop bits.

Terminal Number Designation WRT

Modem (-Global)

Notes

1 +24V dc supply Supply

2 GND Ground

3 +12V dc supply Supply/Ground

4 GND Ground

5 DTR Optional not

normally needed

6 DCD Optional not

normally needed

7 TXD (RS232) Output data from

modem

8 RXD (RS232) Input data to

modem

9 Z = TX (-) RS485 / RS422

10 Y = TX (+) “

11 A = RX (+) “

12 B = RX (-) “

13 GND Ground

Tab. 1 : Connections for the Global Modems

Terminal Number Designation WRT Modem Notes

1 +24V dc supply

2 GND Ground

3 +12V dc supply

4 GND Ground

5 TXD (RS23) Output data

from modem

6 RXD (RS232) Input data

to modem

7 Y = TX (+) RS485 / RS422

8 Z = TX (-) “

9 B = RX (-) “

10 A = RX (+) “

11 GND Ground

Tab. 2 : Connections for the RTcom – Europa Modem

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 20 21

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