Gree GMV5 Series Service Manual page 311

By default, ―A7‖ is displayed.
LED1
Function code Display mode Current progress Display mode Current state Display mode
Flash
A7
2. Press SW2 (▼) on the master ODU to select the function code n5 (setting of IDU number
offset) and press SW7 to confirm. The following is displayed:
LED1
Function code Display mode Current progress Display mode Current state Display mode
ON
n5
3. While number offset waits for being confirmed, press SW7 to enter number offset state.
―Press SW7 to confirm" is displayed.
LED1
Function code Display mode Current progress Display mode Current state Display mode
n5 ON
In this case, all IDU numbers will be automatically offset. One minute later, conflict is
addressed and the system returns to normal. The offset can be set on only the master ODU
whose centralized control address is 0.
Note: If the quantity of conflict IDU numbers is not large, you are advised to manually set
them using Gree Debugger, control panel, or remote control. Manual setting is applicable to
intra-ODU conflicts only, not affecting numbers of other IDUs. If the quantity is large,
automatic offset is recommended, which is easy to realize. However, numbers of normal
ODUs may be altered. Automatic setting is applicable to initial installation and debug.
7.2 Communication Debug Between Modbus Gateways and Air Conditioning Units
Step 1: Set matched resistance of CAN2 bus.
ODU system 1 ODU system 2
Master outdoor unit 1 Master outdoor unit 1
Master ODU of Master ODU of
ODU system 1 ODU system 2
Master outdoor unit 1 Master outdoor unit 1
ODU system 1 ODU system 2
With the matched Without the
resistance matched resistance
With the matched
Without the
resistance matched resistance
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:
0
1
1 2 3 4
Function
The following figure shows how to add matched resistance on the master ODU:
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
LED2
00
LED2
00
LED2
00
CAN2 bus
CAN2 bus
......
......
5 6 7 8
LED3
Flash 00
LED3
Flash 00
LED3
ON 00
ODU system 16
Master outdoor unit 1
Master ODU of
ODU system 16
Master outdoor unit 1
ODU system n
With the matched
Without the
resistance
matched resistance
With the matched
Without the
resistance
matched resistance
With
matched
Without
resistance
matched
configured
resistance
configured
8 8
indicates the position
of toggle switch
308
Flash
Flash
ON
0
1