UPS2000-(6 kVA-20 kVA)
Modbus Protocol Development Guide
1 Communication Protocol
Issue 02 (2016-03-10)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
5
Set toggle 4 to ON, as shown in
. This indicates that the Modbus protocol is
enabled. If both toggles 5 and 6 are set to ON, it indicates a two-wire system. If both of them
are set to OFF, it indicates a four-wire system.
Figure 1-3
Functional DIP switch S1
Table 1-2
Description of the functional DIP switch S1
Toggle Switch
Definition
Settings
Remarks
1
Reserved
ON: 0
OFF: 1
Toggle switches 1, 2, and 3 are
used together to set a 3-bit baud
rate.
Currently, the software version
supports only a baud rate of 9600
bits/s (in this case, toggle switches
1, 2, and 3 are ON).
2
Reserved
ON: 0
OFF: 1
3
Reserved
ON: 0
OFF: 1
4
RS485
protocol toggle
switch
ON: 0
OFF: 1
0: Modbus protocol
5
Toggle switch
for selecting a
two-wire or
four-wire
system
ON: two-wire
system
OFF: four-wire
system
Toggle switches 5 and 6 must be
both ON or both OFF.
6
Toggle switch
for selecting a
two-wire or
four-wire
system
7
Control area
network
(CAN)
build-out
resistor toggle
switch
ON: match
OFF: no match
None
8
RS485
build-out
ON: match
OFF: no match
None
