RTcom Radio Modems user manual Connections, Terminal Number Designation WRT Modem

CONNECTIONS

Data connections should always be made using screened cable. This will insure maximum rejection of interference from outside sources. Always use a common ground point.

The RTcom Global, Eurpoa, MAX 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 over 100m. The modems support various data rates from 1200 to 9600bps depending upon version. All units support 7 and 8-bit ASCII even an odd parity and 1 or 2 stop bits.

Terminal Number	Designation WRT Modem	Notes
1	+24V dc supply
2	GND	Ground
3	+12V dc supply
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
Connections for the Global and Max modems
Terminal Number	Designation WRT Modem	Notes
1	+24V dc supply
2	GND	Ground
3	+12V dc supply
4	GND	Ground
5	TXD (RS232)	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

Connections for the RTcom-Europa Modem

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