adccommunitymod (AutomationDirect) asked a question.
Rs485 into grunfos pump
Created Date: November 13,2013
Created By: dieseltwitch
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Got on a job today and was hooking up drives to the 485 network, then I got to a grundfos cre pump and when I popped off the cover rather then the +,- and gnd I see a RS485A, RS485Y and RS485B... Can any one translate?
Created Date: November 13,2013
Created by: bcarlton
A Specification sheet referrs to 'Fieldbus communication port (RS485) '. In other literature Grundfos refers to Modbus on RS485. But I didn't see a document showing registers.
This literature doesn't seem to document the wire connections.
This one seems to have more. They call the connections 'GENIbus ' but they do specify 'RS485-A '. Concerning that protocol they simply say 'Contact Grundfos for further details '.
Googling a bit more found this document on the protocol itself.
Created Date: November 14,2013
Created by: Tinker
Well, on Wikipedia regarding RS485 pin labeling, they say: "A aka (-) " and "B aka (+) ". And from one Grundfos PDF I found, Y is the shield connection (though said PDF did not indicate the polarity of A & B)
You might find this helpfull: http://www.bb-elec.com/Learning-Center/All-White-Papers/Serial/%E2%80%A2-Polarities-for-Differential-Pair-Signals-(RS-422.aspx
Created Date: November 17,2013
Created by: dieseltwitch
I 've given up on trying to find info. I talked to grundfos tech support and they refuse to release their registry info. Morons! so I 've gone to just controlling it via a 0-10VDC... no feed back but the primary goal is accomplished.
Created Date: November 13,2013
Created by: dieseltwitch
Got on a job today and was hooking up drives to the 485 network, then I got to a grundfos cre pump and when I popped off the cover rather then the +,- and gnd I see a RS485A, RS485Y and RS485B... Can any one translate?