Modbus Gateway(Pro) Technical Service Manual
13
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 II.
Step 2: Set matched resistance of Modbus Gateway(Pro) by referring to chapter II.
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
②. In “The eighth switch of function DIP switch – setting of CAN2 bus matched resistance”, the
setting method of matched resistance of Modbus Gateway(Pro) is introduced. Meanwhile, the
master ODU in the first and end systems of CAN2 bus shall be set as with matched resistance.
In the following, the detailed setting position and method of matched resistance of GMV 5 DC
inverter multi VRF are taken as example.
※CAN2 bus: Detailed meaning please refer to topology introduction.
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