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  1. #1
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    Jan 2015
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    Question Hitachi RCI MODbus issue



    Hi there,

    I am currently having some issues with controlling a Hitachi RCI split through a HC-A32MB MODBUS interface. I am receiving communications from the device and can make setpoint changes etc. but when reading from the registers I only get the “SET” and nothing from “STATUS.”

    There is a constant error 61 coming back from the device which I believe means a loss of communication from the indoor unit, but this isn’t actually happening as I can see the supply and return air temperatures updating in realtime, plus I can make setpoint changes instantly!

    The controls cables are all shielded and not running near to any power lines so any interference is highly unlikely.

    Has anyone had a similar problem before and could possibly point me in the right direction?

    Apologies if this isn't the right location for this post.

    Many thanks,

    Jordan.



  2. #2
    Join Date
    Oct 2006
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    Bucks, U.K.
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    Re: Hitachi RCI MODbus issue

    Have you got the correct termination resistors on the comms line.

  3. #3
    Join Date
    May 2010
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    japan
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    Re: Hitachi RCI MODbus issue

    not 61.It is b1. I think.
    Address refrigerant system configuration error

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