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  1. #1
    Join Date
    Feb 2009
    Location
    MA
    Posts
    10

    York YLAA BACnet MS/TP integration

    I am trying to integrate with a York YLAA chiller via BACnet MS/TP as described in the attached documentation.

    The P1 MAC address is fixed a 2, P1 DE Modifier address = 0, P1 DE modifier offset = 0. Baud rate, stop bits etc match my front end settings. P1 protocol = BACnet. The comm wire is on TB1 on the control panel. Polarity OK.

    There is no response from the chiller. Anything obvious I'm missing? I see activity on TB1 +/- terminals when the buss is disconnected. Tx light blinking, no Rx. Also activity present on the front end (Tridium JACE) 485 port.

    Anyone know the purpose of the DE modifier parameters?
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  2. #2
    Join Date
    Feb 2009
    Location
    MA
    Posts
    10
    Never mind. It turns out the JACE RS-485 terminal block label is installed backwards.

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