Error Codes; Checksum - Mitsubishi Electric Melservo MR-J3-A Instruction Manual

13. COMMUNICATION FUNCTION

13.3.3 Error codes

Error codes are used in the following cases and an error code of single-code length is transmitted.
On receipt of data from the master station, the slave station sends the error code corresponding to that data to
the master station.
The error code sent in upper case indicates that the servo is normal and the one in lower case indicates that an
alarm occurred.
Error code
Servo normal Servo alarm
[A] [a]
[B] [b]
[C] [c]
[D] [d]
[E] [e]
[F] [f]

13.3.4 Checksum

The check sum is a ASCII-coded hexadecimal representing the lower two digits of the sum of ASCII-coded
hexadecimal numbers up to ETX, with the exception of the first control code (STX or SOH).
Station number
STX or
SOH
Checksum range
Error name
Normal operation Data transmitted was processed properly.
Parity error Parity error occurred in the transmitted data.
Checksum error Checksum error occurred in the transmitted data.
Character not existing in the specifications was
Character error
transmitted.
Command not existing in the specifications was
Command error
transmitted.
Data No. not existing in the specifications was
Data No. error
transmitted.
(Example)
ETX Check
Description
S
[0] [A] [1] [2]
T
X
02H 30H 41H 31H 32H
30H 41H 31H 32H 35H 46H 03H
152H
Lower 2 digits 52 is sent after conversion into ASCII code [5][2].
13 - 7
Remarks
Positive response
Negative response
E
[5] [F] [5] [2]
T
X
35H 46H 03H