Gree VRF - Modbus RTU Communication Setup; Communication Material Selection; Gateway-AC Connection Method

Gree VRF Protocol Gateway
11
4.1 Selection of communication material
Communication
system
Cable material
Communication
cable L(m)
Cable diameter
(mm
2
)
Material standard Remark
The communication
between gateway
and BMS via
Modbus bus
Shielding
light/general
PVC sleeve
twisted pair
copper core
cord
L≤800 ≥2x0.75 IEC 60227- 5:2007
When the
communication
distance is over
800m
4.2 Connecting method of communication between gateway
and air conditioner
Caution!
Communication connecting wire of gateway must adopt string connection, rather
than star connection.