Communication Protocol
112
For details, please refer to the following table:
High byte Meaning Low byte Meaning
01 Universal type
02 For water supply
03
Middle frequency
1500HZ
00 CHV
04
Middle frequency
3000HZ
01 Universal type
01 CHE
02
Middle frequency
1500HZ
02 CHF 01 Universal type
If the operation fails, the inverter will reply a message formed by failure command and
error code. The failure command is (Command＋0x80). The error code indicates the
reason of the error; see the table below.
Value Name Mean
01H
Illegal
command
The command from master can not be executed. The reason
maybe:
1. This command is only for new version and this version
can not realize.
2. Slave is in fault status and can not execute it.
02H
Illegal data
address.
Some of the operation addresses are invalid or not allowed
to access.
03H Illegal value
When there are invalid data in the message framed received
by slave.
Note: This error code does not indicate the data value to
write exceed the range, but indicate the message frame is a
illegal frame.
06H Slave busy Inverter is busy(EEPROM is storing)
10H
Password
error
The password written to the password check address is not
same as the password set by P7.00.
11H Check error
The CRC (RTU mode) or LRC (ASCII mode) check not
passed.
12H
Written not
allowed.
It only happen in write command, the reason maybe:
1. the data to write exceed the range of according
parameter
2. The parameter should not be modified now.
3. The terminal has already been used.
13H
System
locked
When password protection take effect and user does not
unlock it, write/read the function parameter will return this
error.
Protocol data unit format of writing single parameter:
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