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Trend IQ3 XNC Modbus Comms Help

thread236-301975

Trend IQ3 XNC Modbus Comms Help

Trend IQ3 XNC Modbus Comms Help

(OP)
Hi All, I am working on a system where I am using a Trend XNC controller to communicate to 2 Eliwell ERT400 AHU controllers via a RS485 2 core network and the Eliwell BUS Adaptor 150's.

I have setup the Trend controller ok and the Modbus driver stores to read data from the Eliwell ERT400 controllers which is all working.

I cannot write information from the Trend to the Eliwell controllers i.e. heating setpoint or ON/OFF signal etc.

I have tried many different command strings to try and sort this out.

I have all of the Eliwell doc's and register address details but cannot work out the right Modbus command or correct setting within the ERT400 to allow data to be accepted.

Has anyone had any dealings with this kind of setup ? any tips, ideas or info would be of great help at this point.

Many thanks  

 
 
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