Connecting the Profibus DP bus
(Original Document)
Illustration
Female 9-pin Sub-D RS 485 connector.
Description
Number
Description
1
Shield
2
M24: 24 V output voltage ground
3
RxD/TxD-P: positive data transmission (RD+ / TD+)
4
CNTR-P: positive repeater monitoring signal (direction monitoring): not used
5
DGND: data transmission ground
6
VP: line termination bias voltage
7
P24: output voltage 24 V
8
RxD/TxD-N: negative data transmission (RD- / TD-)
9
CNTR-N: negative repeater monitoring signal (direction monitoring): not used
NOTE: RxD/TxD-P, DGND, VP, RxD/TxD-N signals are mandatory. The other signals are optional.