Modbus communication protocol
78
A.5.3 Host write slave parameter
Command code 06H. Host can write an parameter by initiating a communication transaction .
E.g.,The decimal system 5000 (1388H) written to the inverter 0101H address whose slave
address is 02
，
host command including:
ADR 02H
CMD 06H
Parameter address high byte
01H
Parameter address low byte
01H
Parameter value high byte
13H
Parameter value low byte
88H
CRC check value low byte
D4
CRC check value high byte
93
The contents of slave reply:
ADR 02H
CMD 06H
Parameter address high byte
01H
Parameter address low byte
01H
Address 0101H content high byte
13H
Address 0101H content low byte
88H
CRC check value low byte
D4
CRC check value high byte
93
A. 6 Data communication address allocation
A.6.1 Function code F00-F26 group communication address
Inverter function parameter’s MODBUS communication address addressing process follows
PPnn way: PP means high byte of the address, corresponding to function parameter’s group
number; nn means low byte of the address,corresponding to function code parameter’s group
internal code. For example:F3.21 function code’s communication address is 0315H, 03H is the hex
form of group number 3, 15H is the hex form of group internal code 21.F00.00~F26.17
communication address is 0000H~1A11H, F26 group fault record parameter start address is
1A00H.
A.6.2 Control command and status word communication address
Variable
Name
Communicat
ion address
Reading-writing
attribute
Command data or response value meaning
Run
command
word
1E00H Reading
and
writing
1:reserved
2:jog stop command
3:forward jog run
4:reversal jog run
5:run
6:stop
7:forward run
8:reversal run
9:fault reset
10:reserved
Serial port value
1E01H
Reading and
F01.02 hundreds=0:5000represents50.00Hz
ENC
