1) The UP communication port of 1# repeater is connected to the communication port of 10# IDU, and the
DOWN communication port of 1# repeater is connected to the communication port of 11# IDU.
2) The UP communication port of 2# repeater is connected to the communication port of 20# IDU, and the
DOWN communication port of 2# repeater is connected to the communication port of 21# IDU.
3) For each repeater added, 10 IDUs and 200 m communication distance can be added. A refrigerant
system allows the addition of a maximum of 2 repeaters and can connect to up to 30 IDUs. If more than 30
IDUs are connected, please allocate separate refrigerant systems.
3. If communication cables connecting the communication ports of the repeater, IDU and ODU form a
closed loop, it will cause a communication fault.
4. RS-485 communication cables must be connected hand in hand. If communication is unstable, a
matching resistor needs to be added to the last IDU on the PQ (in the accessory bag of the ODU). However,
a matching resistor should not be added between M1 and M2. Otherwise, a communication fault may occur.
5. To select the communication mode MDV-Link (M1M2), users must go to the ODU menu item to change
the mode (For the setting method, refer to the ODU Installation Manual). Otherwise, communication faults
may occur.
6. The V8 platform ODU typically uses the V8 communication protocol. If there are any IDUs that use a
non-V8 platform, users must go to the ODU menu item to change the communication protocol (Please refer
to the ODU Installation Manual for setup instructions). Otherwise, these IDUs will display communication
fault codes (For the code number, please refer to the IDU wiring nameplate).
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