EM8 User's Manual
Appendix 1:Rs485 Communication Protocol
92
code when users try to modify these parameters.
6: Illegal function code
It will return this error code when the code address in the message is invalid (it is not the specified
encoding address in the status monitoring list and function parameter list).
Remark
●
Parameter value=setting parameter value/minimum unit.
For example, set the blackout restart waiting time as 5.6s. The minimum unit is 0.1, parameter
value=5.6/0.1=56 hexadecimal number is 38H. Look for the minimum unit for each parameter in the
function code list.
(2)Processing data
●
Master command frame: running word.
Slave response frame
:
status word
Data meaning: The running word is data of the master controlling the slave. The status word is data of the
response from the slave running. The detailed meaning is below:
Data type: hexadecimal notation, double byte, upper byte is behind.
Running word
:
(upper computer
→ inverter)
Bit
Meaning
Function description
0
Reserve
1
Normal running
1: Make a normal running command to the slave(inverter)
0: Invalid
2
Reversal running
1: Make a reversal running to the slave(inverter)
0: Invalid
3
Error reset
1: Error reset
0: Invalid
4
Master control
valid
1: The running word and setting value in the current data frame update the
old data. Reset this point if you want to finish this control task.
0: The running word and setting value in the current data is invalid. the
inverter should keep the control word and setting value in the last time.
5
Reserve
6
Reverse
7
Reserve
8
Free stop
1: Give a free stop command to the slave(inverter)
0: Invalid
9
Reserve
10
Reserve
11
Reserve
12
Reserve
13
Reserve
14
Normal inching
turning
1: Give a normal inching turning command to the slave(inverter)
0: Invalid
15
Reverse JOG
1: Give a reverse JOG command to the slave(inverter)
0: Invalid
Remark
●
Priority of the control order: forward inching turning, reversal inching turning, forward running, reversal
running, free stop.
