Trane PIC - Page 17

Installation
17BAS-SVX08D-E4
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.
MODBUS
TxRx
RS485
A Ref B
Resistor
On
ON
OFF