Westermo ED-10 TCP - Manual (Page 11)

11 6609-2211
2-wire termination
4-wire termination
5.2.1 RS-422/485 general advice
=Termination
ED-10
Slave unit Slave unit Slave unit
ED-10
Slave unit Slave unit Slave unit
Max 0.3 metre
=Termination
T+
T–
A B A B A B
R+
R–
T+
T–
R– R+ R+ T– T– B’ A’ B A T+ T+ R–
Termination recommendations
The RS-422/485 line must be terminated.The receiver of master and receiver of final bus
slave shall be terminated.
RS-422/485 connection pins can be differently named. For some brands the T+ corre-
sponds to A, but other brands might use some other naming convention.
If a unit does not work it can help to swap A and B.
5 4 3 2 1
4-wire
5 4 3 2 1
2-wire
Twisted pair cable is recommended