Trane PIC Installation Operation Maintenance/ Programming page 17

Protocol interface controller, modbus solution for trane chillers and rooftops
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Installation
If the RS485 wire length is less than 100 meters, it is recommended to use
the termination resistor option. Set the 'Resistor' switch to the 'On' position.
See following figure.
ON
OFF
Rx
Tx
A
Ref
B
On
MODBUS
RS485
Resistor
BAS-SVX08D-E4
17

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