Westermo RD-48 - Manual (Page 27)

27 6153-2004
9. Application example
Normally star networks is not allowed in RS-422/485 applications. Using the RD-48
makes it possible to create branches up to 1200 m. Observe that the RD-48 should be
connected a maximum of 30 cm from the bus.
Observe setting of termination and fail-safe.
RD-48
RD-48
RD-48
RD-48 RD-48 RD-48 RD-48 RD-48 RD-48 RD-48 RD-48
RD-48
RD-48
+5V 0V
Line
Termination
and fail-safe
R–
R+
= Termination and fail-safe
Note ! It is not possible to have more than 8 repeaters in serial connection
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
1 2 3 4
1 2 3 4