Communication Procedure Example - Mitsubishi Electric MELSERVO-J5 User Manual

Communication procedure example

The following example reads the set value of alarm history (last alarm) from the servo amplifier of station 0.
Data item
Station No.
Command
Data No.
No
3 consecutive times?
Error processing
9 COMMUNICATION FUNCTION (MITSUBISHI ELECTRIC AC SERVO PROTOCOL) [A]
510
9.3 Protocol
Value
0
33
10
Start
Data make-up
Checksum calculation and
addition
Addition of SOH to make up
transmission data
Data transmission
Data receive
Is there receive data?
Yes
Yes
Other than error code
[A] or [a]?
No
Yes
Receive data analysis
End
Description
Servo amplifier station No. 0
Reading command
Alarm history (last alarm)
Station No. Command
Data = [0] + 3 3 +
STX
= [0] [3] [3]
[1] [0]
STX
Checksum = 30H + 33H + 33H + 02H + 31H + 30H + 03H =
Transmission data = SOH
No
No
300 ms elapsed?
Yes
No
3 consecutive times?
Yes
100 ms after EOT transmission
Error processing
Data No.
+ 1 0 + ETX
ETX
+ 0 + 3 3 + + 1 0 + ETX
STX
Master station
Master station
Master station
FCH
+ F C 46H 43H
Slave station
Slave station
Slave station