Appendix Communication Protocol GK600 User Manual
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Application layer
protocol data unit
Data length (number of bytes)
Range
Parameter
1
0x80 + parameter
Error code
1
Check
LRC or CRC
Error codes supported by Modbus protocol are listed in the table below:
Appendix Table 21 Error codes
Error codes
Meanings of error codes
0x01
Illegal parameter
0x02
Illegal register address
0x03
Data error, i.e. data are out of upper limit or lower limit
0x04
Slave operation failed, including errors caused by invalid data
although there are in the range
0x05
Command is valid and being processed, mainly used for storing data
to non-volatile storage
0x06
Slave is busy, please try again later; mainly used for storing data into
non-volatile storage
0x18
Message frame error: including message length error and check error
0x20
Parameter is not changeable
0x21
Parameter is not changeable during the running
0x22
Parameter is under password protection
Drive control parameters are used for start, stop and run frequency setting. By detecting drive
status parameters, run status and run mode can be obtained. Drive control parameters and
status parameters are shown in appendix table 22.
Appendix Table 22 Control parameters
Register address
Parameter name
Save at power
loss
0x6200
Control command word
No
0x6201
Master frequency setting
Yes
0x6202
Auxiliary frequency setting
Yes
0x6203
Master frequency setting
No
0x6204
Auxiliary frequency setting
No
0x6205
Multi-step frequency setting
No
