Modbus Gateway(Pro)
17
(2) Communication wire connection between Modbus Gateway(Pro) and air
conditioner:
Step 1: Confirm the master ODU that each Modbus Gateway(Pro) shall be
connected. Please refer to “6.2.2(2) Communicaiton connection between Modbus
Gateway(Pro) 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(Pro) and the G1 and G2 port of wiring board of corresponding
master ODU with communication cable, as shown in step ⑤ in the figure.
(3) DIP switch of Modbus Gateway(Pro):
Step 1: Set address DIP switch of Modbus Gateway(Pro) by referring to chapter
4.3.2.
Step 2: Set matched resistance of Modbus Gateway(Pro) by referring to
chapter 4.3.3–4.3.4.
Note:
① In Modbus bus, if the connected Modbus Gateway(Pro) 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 RS485-1 communication interface of
nearby Modbus Gateway(Pro).
30 Modbus gateways in maximum between two repeaters
Total accumulative length of communication cable
between two repeaters shall not exceed 800m
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