Honeywell SmartVFD HVAC MR4 User Manual page 59

Honeywell
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If the drive is the last device on the bus, the bus termination must be set.
Locate the DIP switches to the right of the control keypad of the drive and turn
the switch for the RS485 bus termination resistor to position ON. Biasing is built
in the termination resistor. See also step 7 on page 58.
4
Unless already done for the other control cables,
cut free the opening on the drive cover for the
RS485 cable (protection class IP21).
5
ON
RS485*
Current AO1
Current
AI2
Current
AI1
* Bus termination resistor
C
ONTROL UNIT
OFF
Voltage
Voltage
Voltage