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5 error codes, 6 checksum, Communication functions – MITSUBISHI ELECTRIC MELSERVO MR-J2S- A User Manual

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14 - 8

14. COMMUNICATION FUNCTIONS

14.5 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

Error name

Description

Remarks

[A]

[a]

Normal operation

Data transmitted was processed properly.

Positive response

[B]

[b]

Parity error

Parity error occurred in the transmitted data.

[C]

[c]

Checksum error

Checksum error occurred in the transmitted data.

[D]

[d]

Character error

Character not existing in the specifications was
transmitted.

[E]

[e]

Command error

Command not existing in the specifications was
transmitted.

[F]

[f]

Data No. error

Data No. not existing in the specifications was
transmitted.

Negative response

14.6 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).

Check

Checksum range

ETX

STX or
SOH

Station number

S
T
X

02H

[0]

30H

[A]

41H

[1]

31H

[2]

32H

[5]

35H

[F]

46H

E
T
X

[5] [2]

03H

30H 41H 31H 32H 35H 46H 03H
152H

(Example)

Lower 2 digits 52 is sent after conversion into ASCII code [5][2].