Wire termination 4-wire termination, Twisted pair cable is recommended – Westermo ED-10 TCP User Manual
Page 11
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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
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