Mitsubishi Electric MR-J4, Instruction Manual

Page: 538 / 794

14. COMMUNICATION FUNCTION (MITSUBISHI GENERAL-PURPOSE AC SERVO PROTOCOL)
14 - 9
14.3.8 Communication procedure example
The following example reads the set value of alarm history (last alarm) from the servo amplifier of station 0.
Data item Value Description
Station No. 0 Servo amplifier station 0
Command 3 3 Reading command
Data No. 1 0 Alarm history (last alarm)
Data = [0]
= [0] [3] [3]
Transmission data =
Other than error code
[A] or [a]?
3 consecutive times?
300 ms elapsed?
Start
Data make-up
Checksum calculation and
addition
Addition of SOH to make up
transmission data
Data transmission
Data receive
3 consecutive times?
Receive data analysis
End
100 ms after EOT transmission
Error processing Error processing
No
Yes
Yes
Yes
No
No
No
No
Yes
Yes
Master station
Is there receive data?
Command Data No.
Checksum = 30H + 33H + 33H + 02H + 31H + 30H + 03H =
46H 43H
Station No.
Slave station
Master station Slave station
Master station Slave station
ETX STX
ETX STX 3 3 1 0 + + + +
ETX SOH 0 STX 3 3 1 C F 0 + + + + + +
FCH
[1] [0]