10
1.3.2
Communication Connection
Communication system of Modbus Gateway(Mini) includes:
（1）Communication between Modbus Gateway(Mini) and BMS;
（2）Communication between Modbus Gateway(Mini) and air conditioner.
1.3.2.1
Material Selection of Communication Cable
Communication system
Material of cable
Communication
cable L(m)
Cable diameter
(mm
2
)
Material
standard
Remark
Communication between
Modbus Gateway(Mini)
and BMS
Light/Ordinary PVC
sheathed twisted pair
copper wire(RVV)
L≤800 ≥2×0.75
IEC60227-
5:2007
When communication
distance exceeds
800m, photoelectric
isolation repeater shall
be added
Communication between
Modbus Gateway(Mini)
and air conditioner
Light/Ordinary PVC
sheathed twisted pair
copper wire(RVV)
L≤500 ≥2×0.75
IEC60227-
5:2007
The length of
communication cable
shall not exceed 500m
1.3.2.2
Communication Connection Way
Notice! All communication cables of Modbus Gateway(Mini) must be connected in series instead of in star mode.
（1）Communicaiton connection between Modbus Gateway(Mini) and BMS;
(2) Communication connection between Modbus Gateway(Mini) and air conditioner (n is air conditioner quantity, n≤16);
Modbus Gateway(Mini)
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