GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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3. Connection Steps
(1) Connection between the Modbus gateway and the Gree web-based remote monitoring and control
system
Step 1: confirm the first Modbus gateway (Modbus gateway 1) to be connected to the Gree web-based
remote monitoring and control system, and then connect RS485-1 interface R+ and R- of this Modbus
gateway to the optoelectric converter interface R+ and R- or BMS through communication lines. (see ①)
Step 2: connect RS485-1 interface R+ and R- of Modbus gateway 1 to the second Modbus gateway
(Modbus gateway 2) RS485-1 interface R+ and R- through communication lines. (see ②)
Step 3: follow the same way as in Step 2 to connect other Modbus gateways in series. (see ③)
(2) Connection between the Modbus gateway and the air conditioning system
Step1: confirm the master units to be connected to each Modbus gateway. Serial connection should be
applied as described in Section 5.2.2.(2) Communication lines between the Modbus gateway and the air
conditioning system. (see ④)
Step 2: connect the Modbus gateway‗s CAN interface G1 and G2 to the interface G1 and G2 at the
terminal board of the corresponding master unit. (see ⑤)
Step 3: when two Modbus gateways (gateway 2 and gateway 3) are required for one CAN2 network,
connect one gateway's (gateway 2) CAN interface G1 and G2 to the interface G1 and G2 at the terminal
board of the master unit, and then connect the other gateway's (gateway 3) interface G1 and G2 to the
interface G1 and G2 of the former gateway (gateway 2). (see ⑥ and ⑦)
※ CAN2 network: Please refer to the system network diagram.
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