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| 4/13/2008 6:49 AM | |
Joined: 9/27/2006 Last visit: 11/12/2024 Posts: 12293 Rating:
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Hello zognjanovic; The S7-200 Modbus stopbit setting is fixed at one, you cannot change it. See this excerpt from the S7-200_e system manual: The parameter Parity is set to match the parity of the Modbus master. All settings use one stop bit. The cable is standard RS-485, either Profibus cable + connectors as in the following FAQ example or pins 3-->3. 8-->8 and 5-->5 (signal grounding) on a Sub-D 9 pin connector. Make sure yiour ground pins are connected and your cable should be OK, at first glance. http://support.automation.siemens.com/WW/view/en/27832511 If you have a RS-232 to RS-485 converter, you could use Hyperterminal just to see if the master is sending Modbus datacorrectly,and use a standard downloadable Modbus tester program with the slave(Modtest or Modscan come to mind). Hope this helps, Daniel Chartier |
| 1/30/2017 9:50 AM | |
Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating:
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New question published by afeef is split to a separate thread with the subject RS485 pin out details of port in CPU 226. Best regards |
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