4. Device installation | 4.3 - Hardware construction | 51
Allocation of the D-sub 9-pin plug connector
Pin assignment Signal Color Description
Housing S Screen
1 not connected
2 not connected
3 RxD/TxD-P (positive)
according to
RS-485 specification
red Send/receive data
Data core B/D (P)
4 if required RTS "Request To Send" (only when
using a repeater)
5 DGND Insulated GND to RS-485 side
6 VP Insulated power supply+5V to
RS-485 side
7 not connected
8 RxD/TxD-N (negative)
according to
RS-485 specification
grün Send/receive data
Data core A/D (N)
9 not connected
Note:
Only plug connections with integrated terminating resistors may be used.
The terminating resistor must be turned on in the last slave.
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