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Modbus Communication Protocol
41
C-09
Input terminal status
1009H
C-10
Output terminal status
100AH
C-11 Reserved
C-12
Analog input CCI value
100CH
C-13 Reserved
C-14 Reserved
7.6 Communication error processing
Inverter receiving data packet detecting error, when it finds read-write
parameter address or parameter value illegal, answer to the host with communication
error answer packet. Communication error answer packet take (Host command code
+80H) as command code, with 1 byte error code.
Format for communication error answer packet as follows:
ADR 01H
CMD 83H/86H
communication error code
01H~06H
(
for details, please check
below table
)
Low byte of CRC check value
Obtain by calculating
High byte of CRC check value
Obtain by calculating
Meaning for each communication error code value as follows:
Communication error code value
Type of communication error
0x01
CRC check error
0x02 Command
code
illegal
0x03
Register address visited illegal
0x04
Value to write register illegal
0x05
Not allow to modify parameter
0x06
number of read register illegal
7.7 Data frame examples
7.7.1 Start #1 inverter running
Data
Field
slave
Addr
ess
command
code
Register
addr
ess
High byte
Register
addr
ess
low byte
Data
High byte
Data
Low byte
CRC
low bit
CRC
high bit
Host
command
frame
01 06 20 00 00 05 42 09
Slave
respond
frame
01 06 20 00 00 05 42 09
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