VCP25.1 Project Planning Manual - Bosch Rexroth

7-6 Bosch Rexroth AG | Electric Drives and Controls Rexroth IndraControl VCP 25 | R911299720 / 02Interfaces7.1.2 RS485 (X3-SER1)The interface is suitable for point-to-point and for multi-point connections.The wires belonging together are marked with „A“ and „B“. Somedescriptions refer to the pins with „+“ and „-“ , where A = + and B = -.Signal Logic 1 U A - U B = +0.3 V i.e. (U A > U B )7.1.2.1 Pin AssignmentFig. 7-6:25 pin D-SUB female connector stripConnector in the small operator terminal: 25-pin D-SUB female connectorstripPin Designation Function8 T(A) Transmitted data (+)9 T(B) Transmitted data (-)11 SGND Signal Ground22 R(A) Received data (+)23 R(B) Received data (-)Fig. 7-7: Pin assignment RS485The D-SUB connector strips must be shielded sufficiently. See chapter„Shielding D-SUB Connectors“ on page 7-23.7.1.2.2 TerminationFor point-to-point connections, always activate the termination. Formulti-point connections, only activate the termination at the cable end.