MCM-1350 and Kohler
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mpiquette
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Wednesday 22 June 2005 11:59:23 pm |
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MCM-1350 and Kohler
I have a SLC 5/03 with an MCM-1350. Both ports are Modbus Masters. Port 1 is communicating fine with a Modbus device. Port 2 is connected rs-485 to a Kohler Decision Maker 550. We can not establish communication with this device. I have tried different baud rates, parity and stop bit settings. Kohler is basically giving me the run around - no one there has experience connecting Modbus. Any ideas?
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jsanders
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Friday 24 June 2005 5:28:26 am |
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RE:MCM-1350 and Kohler
A few things to check...
Be sure you set our module jumper for RS-485 mode and use our DB9 to screw terminal adapter to connect your two-wire RS-485 cable to our module. This adapter has DB9 pins 7 & 8 jumpered, as required for our module to communicate.
Also, you'll need to create commands in the 3150-MCM ladder to poll the Kohler for data. To create these commands, you'll need a Slave ID # from the controller configuration and a Modbus data map from Kohler. According to their website, a document called, "TP-6113, Modbus Communications Protocol Operations Manual for Decision Maker 550", should give you information on the unit's Modbus interface. So far, we have been unsuccessful in obtaining a copy of this manual
You might also try reversing the two RS-485 leads. Sometimes, this helps.
If you can get Kohler to supply their document, you could send it, along with a copy of your ladder program to Prosoft Technical Support for further assistance. Please send your e-mail to: support@psft.com
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