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Profibus db9 pinout Directory
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RS485,RS423,RS422,RS232 Pinout Table

DB-9 Male Pin RS-232 RS-485
1 DCD RXD+
2 RxD TxD+
3 TxD TxD-
4 DTR RxD-
5 Ground Signal Ground Signal
6 Reserved CTS-
7 RTS RTS-
8 CTS RTS+
9 Reserved CTS+


2-Wires,4-Wire RS485 Connections Diagram and pinout


2-wire RS485 Connections


4-wire RS485 Connections

PLCS.net - Interactive Q & A - Siemens S7-300 & Citect SCADA COMMS
I havn't been able to find the Siemens MPI pinout. ... I have to comunicate via PROFIBUS with S7 protocol or DP, the applicom card PC1500PFB and PLC siemens ...

Active
The pinout of the DB9 connector ensures straightforward wiring. ... The PROFIBUS DP interface complies with European field bus standard EN50170 and ...

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