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Step 2: Connect the RS485 communication port of Modbus Gateway(Mini) (-
Modbus Gateway(Mini)1) with the RS485 communication port of the second
Modbus Gateway(Mini) (Modbus Gateway(Mini)2 as shown in the figure) with
communication cable; as shown in step ② in the figure.
Step 3: The other Modbus Gateway(Mini)shall be connected in series; as shown
in step ③ in the figure.
（2）Communication wire connection between Modbus Gateway(Mini) and air
conditioner:
Step 1: Confirm the master ODU that each Modbus Gateway(Mini) shall be
connected (set master ODU with SA8 DIP). Please refer to “7.2.2(2)
Communicaiton connection between Modbus Gateway(Mini) and air conditioner”
and adopt series connection, as shown in step ④ in the figure.
Step 2: Connect the G1 and G2 port of CAN communication interface of Modbus
Gateway(Mini) and the G1 and G2 port of wiring board of corresponding master
ODU with communication cable, as shown in step ⑤ in the figure.
※ CAN2 network: Detailed meaning please refer to topology introduction.
（3）Modbus Gateway(Mini) DIP setting:
Step one: Set address DIP of Modbus Gateway(Mini);
Step two: Refer to Chapter 5.3.4 to set matching resistance of Modbus Gateway
(Mini);
Note:
1. In Modbus bus, if the connected Modbus Gateway(Mini) exceeds 30 or
communication distance exceeds 800m, one photoelectric isolation repeater shall
be added. Connect the R+ and R- port of photoelectric isolation repeater with the R
+ and R- port of RS485 communication port of nearby Modbus Gateway(Mini).
Modbus Gateway(Mini)
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