GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
315
When the Modbus gateway is located at either end of the CAN2 bus, it shall be coupled with a
matched resistance and the eighth position should be set to ―0‖.
When the Modbus gateway is located at neither end of the CAN2 bus, no matched resistance is
required the eighth position should be set to ―1‖.
ODU system 2
Master outdoor unit 1
ODU system 16
Master outdoor unit 1
ODU system 1
Master outdoor unit 1
……
With the matched
resistance
With the matched
resistance
Without the
matched resistance
Without the
matched resistance
CAN2 bus
Master ODU of Master ODU of Master ODU of
ODU system 1 ODU system 2 ODU system n
ODU system 2
Master outdoor unit 1
ODU system 16
Master outdoor unit 1
ODU system 1
Master outdoor unit 1
……
With the matched
resistance
With the matched
resistance
Without the
matched resistance
Without the
matched resistance
CAN2 bus
The following figure shows how to set matched resistance:
8
With
matched
resistance
configured
Without
matched
resistance
configured
8
indicates the position
of toggle switch
Function
1 65432 7 8
0
1
0
1
NOTE:
The master ODU at either end of the CAN2 bus must be configured with matched resistance
as well. The following figure shows how to set matched resistance for GMV5 DC converter multi-online
air conditioning units and specific position:
Master outdoor unit
Matched
resistance
Master ODU
Matched resistance
4) Function DIP Switch-RS485 Bus Matched Resistance Setting
The seventh position of this function DIP switch is used to set the matched resistance for the RS485
bus (herein, it is the Modbus bus)
The RS485 bus should be terminated with a matched resistance to avoid signal reflex along the
transmission line.
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