7-6
Bosch Rexroth AG | Electric Drives and Controls
Interfaces
7.1.2
RS485 (X3-SER1)
7.1.2.1 Pin Assignment
7.1.2.2 Termination
The interface is suitable for point-to-point and for multi-point connec-
tions.
The wires belonging together are marked with „A" and „B". Some
descriptions refer to the pins with „+" and „-" , where A = + and B = -.
Signal Logic 1
U
Signal Logic 0
U
Fig. 7-6: 25 pin D-SUB female connector strip
Connector in the small operator terminal: 25-pin D-SUB female con-
nector strip
Pin Designation Function
8
T(A)
Transmitted data (+)
9
T(B)
Transmitted data (-)
11
SGND
Signal Ground
22
R(A)
Received data (+)
23
R(B)
Received data (-)
Fig. 7-7: Pin assignment RS485
The D-SUB connector strips must be shielded sufficiently. See chapter
„Shielding D-SUB Connectors" on page 7-23.
For point-to-point connections, always activate the termination. For
multi-point connections, only activate the termination at the cable end.
Rexroth IndraControl VCP 25 | R911299720 / 02
- U
<= -0.3 V i.e. (U
A
B
A
- U
>= +0.3 V i.e. (U
A
B
< U
)
B
> U
)
A
B