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S7 200 communication.

12/11/2010 8:01 PM	Rate (0)
nandgate Posts: 319 Rating: (9)	i have a CPU 226 CN module that has to be linked with op77b HMI. can anyone suggest me how to establish communication between them using rs 485 interface? Is the pin configuration 3-3, 5-5 and 8-8 O.K ( using 9 pin connectors).
nandgate Posts: 319 Rating: (9)
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12/13/2010 10:59 AM	Rate (0)
seb_nancy Posts: 37 Rating: (0)	According to the documentation of the OP77B, see link below : http://support.automation.siemens.com/WW/view/en/18796568 for RS 485 : 1 N.c 2 M 3 LTG-B 4 RTS-AS 5 GND 6 DC +5V 7 DC 24 V in 8 LTG-A 9 RTS-AS
seb_nancy Posts: 37 Rating: (0)	Last edited by: O_Moderator at: 12/13/2010 11:10 AM link edited
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12/14/2010 6:05 PM	Rate (0)
nandgate Posts: 319 Rating: (9)	thanks it is working well.
nandgate Posts: 319 Rating: (9)
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