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?