Communication Mode At The Physical Layer - Huawei UPS2000 Development Manual

UPS2000-(6 kVA-20 kVA)
Modbus Protocol Development Guide
Pin
No.
7
8
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1.4 Communication Mode at the Physical Layer

After the slave nodes are powered on or reset, and run steadily, the slave nodes respond to the
read or write commands. When the slave nodes receive the relevant command, the slave
nodes return the queried information to the master node under normal conditions. Under
abnormal conditions, the slave nodes return the specific error codes corresponding to the error
types.
Table 1-4
Table 1-4 Error code list
No.
0x01
0x02
0x03
0x04
0x05
Issue 02 (2016-03-10)
Signal
None
None
lists the error codes.
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Corresponding Signal of RS232-RS485
Adapter
Two-wire system
N/A
N/A
Name
Invalid function code
Invalid parameter
Invalid data
Slave node execution failed
Reload the start command
1 Communication Protocol
Four-wire system
N/A
N/A
Description
Slave nodes received
unsupported or incorrect
function codes.
Slave nodes received invalid
function code parameters.
Slave nodes received invalid
data such as CRC checking
error.
Slave nodes failed to
respond to the command.
Slave nodes are busy.
8