Gree GMV BACnet

GMV BACnet Gateway Technical Service Manual
14
Protocol shall refer to the specification.
Start
BMS system equipment issues request
frame which meets the specification of
BACnet protocol to BACnet gateway
BACnet gateway CAN RX/
TX light is blinking
Communication between
BACnet gateway and BMS
system equipment is normal
End
Yes
No
BACnet gateway CAN light is
blinking, its communication
with AC equipment is normal
Abnormal condition
treatment 2
2.3 EXCEPTION HANDLING
Note: Here are several reasons and troubleshooting methods for exception handling under
exception conditions. It not solved, please contact relevant professional Gree staff.
Abnormal condition
treatment 1
BACnet gateway
CAN light is not on
BACnet gateway does not
receive the data from AC unit
The matched resistance
in every nod of CAN
bus are not correctly set
Refer to the dial-up
setting in “1. Hardware
debug” and inspect if the
matched resistance in
CAN bus is correctly set
Communication connection cable
between gateway and AC unit is
not correct or the communication
cable is not connected
Check the continuity of
communication cable: refer
to “3.2 communication
connection” and check if the
communication connection
between BACnet gateway
and AC unit is correct
Communication distance
among CAN bus exceeds 500m
Decrease the communication
distance of CAN bus to 500m,
suggest to install BACnet
gateway nearby the AC