Rockwell Automation RECOMM-PBUS PROFIBUS Communications Module - Manual (Page 19)

Installing the PROFIBUS Module 3-3
Only use cable that conforms to PROFIBUS cable standards.
Belden #3079A PROFIBUS cable or equivalent is recommended.
Figure 3.2 – ERNI and Phoenix Subcon Connectors
Figure 3.3 – Network Wiring Diagram
ERNI Connector Phoenix Subcon Plus 1M Connector
B A B A B A B A A B A B
Table 3.1 – RECOMM-PBUS DB-9 Pin Layout
Terminal Signal Function
Housing Shield
1 Not connected
2 Not connected
3 B-LINE Positive RxD/TxD,
according to RS485
specification
4 RTS Request to send
5 GND BUS Isolated GND from
bus