Gree GMV BACnet

GMV BACnet Gateway Technical Service Manual
10
Notice!
Main control ODU or gateway at the top/end of CAN bus must be with matched resistance;
otherwise the communication might be wrong!
※
CAN bus: specific meaning shall refer to the specification Internet topological graph.
※
The No.8 dial-up button in function dial-up machine shall be used in the setting in the matched
resistance of CAN bus in this gateway.
When the gateway is at the top/end of CAN bus, the gateway shall be with the matched
resistance, then dial the No.8 function dial-up machine to 0;
When the gateway is not at the top/end of CAN bus, the gateway is not with the matched
resistance, then dial it to 1.
main control unit of
ODU system 2
main control unit of
ODU system n
main control unit of
ODU system 1
……
set to be with the
matched resistance
set to be with the
matched resistance
set not to be with the
matched resistance
set not to be with the
matched resistance
CAN bus
main control unit
of ODU system 2
main control unit
of ODU system n
main control unit
of ODU system 1
……
set to be with the
matched resistance
set to be with the
matched resistance
set not to be with the
matched resistance
set not to be with
the matched
resistance
CAN bus
n stands for the quantity of ODU system, n≤16.
Dial-up setting graph for the matched resistance
：
8
with the
matched
resistance
not with
the
matched
resistance
8
is the location for dial-up button
function
1 65432 7 8
0
1
0
1
1.2 LED DISPLAY
The above LED indicator is mainly consisting of two parts: status indicator (run, alarm, power)
and communication indicator (CAN, RS485, RS2332). The following table is the working status of
each indicator.