Error Codes; Checksum - Mitsubishi Electric MELSERVO-J5 User Manual

Error codes

Error codes are used in the following cases and an error code of single-code length is transmitted.
Once the data from the master station is received, the slave station sends the corresponding error code to the master station.
An error code sent in upper case indicates that the servo is in a normal state, and one in lower case indicates that an alarm
has occurred on the servo.
Error code
In normal state
[A]
[B]
[C]
[D]
[E]
[F]

Checksum

The checksum is an ASCII-coded hexadecimal representing the last 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 No.
STX
or
SOH
[0] [A] [1] [2]
02H 30H 41H 31H 32H 35H 46H 03H
30H + 41H + 31H + 32H + 35H + 46H + 03H
= 152H
Lower 2 digits 52 is sent after conversion into ASCII code [5] [2].
9 COMMUNICATION FUNCTION (MITSUBISHI ELECTRIC AC SERVO PROTOCOL) [A]
508
9.3 Protocol
Error name
At alarm occurrence
[a] Normal
[b] Parity error
[c] Checksum error
[d] Character error
[e] Command error
[f] Data No. error
ETX Checksum
Checksum range
[5] [F]
[5] [2]
Explanation
Transmitted data was processed normally.
A parity error occurred in the transmitted data.
A checksum error occurred in the transmitted data.
An unsupported character was transmitted.
An unsupported command was transmitted.
An unsupported data No. was transmitted.
Remark
Positive
response
Negative
response