GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
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setting is applicable to initial installation and debug.
2.1.7.2 Communication Debug Between Modbus Gateways and Air Conditioning Units
Step 1: Set matched resistance of CAN2 bus.
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
As shown in the preceding figure, the master ODU and the Modbus gateway at both ends of the
CAN2 bus need to be configured with matched resistance.
The following figure shows how to set matched resistance on the Modbus gateway at the end of the
CAN2 bus:
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
The following figure shows how to add matched resistance on the master ODU:
Master outdoor unit
Matched
resistance
Step 2: Power off air conditioning units and Modbus gateways and then power them on.
Step 3: View communication LEDs.
Check whether the CAN_RX LED corresponding to the Modbus gateway is flashing. If not, check
whether the G_TX LED corresponding to the master ODU whose centralized control address is 0 is
flashing or steady on. If not, check communication lines and DIP settings.
2.1.7.3 DIP Switch Setting for Modbus Gateways
Step 1: Set Modbus gateway address.
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