ProSoft Technology 5201-MNET-101S - Manual (Page 55)

IEC-101 Slave ♦ ProLinx Communication Gateway Gateway Communication Ports
IEC 60870-5-101 v3 Slave (Firmware version 3.xx) Protocol Manual
ProSoft Technology, Inc. Page 55 of 159
August 6, 2010
3.3.4 RS-422
The RS-422 interface requires a single four or five wire cable. The Common
connection is optional, depending on the RS-422 network devices used. The
cable required for this interface is shown below:
3.3.5 RS-485 Application Port(s)
The RS-485 interface requires a single two or three wire cable. The Common
connection is optional, depending on the RS-485 network devices used. The
cable required for this interface is shown below:
Note: Terminating resistors are generally not required on the RS-485 network, unless you are
experiencing communication problems that can be attributed to signal echoes or reflections. In
these cases, installing a 120-ohm terminating resistor between pins 1 and 8 on the gateway
connector end of the RS-485 line may improve communication quality.
3.3.6 RS-485 and RS-422 Tip
If communication in the RS-422 or RS-485 mode does not work at first, despite
all attempts, try switching termination polarities. Some manufacturers interpret +
and -, or A and B, polarities differently.