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13. COMMUNICATION FUNCTIONS
13.5 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
13.6 Checksum
Checksum range
Check
Checksum range
ETX
STX or
SOH
St
at
ion n
u
mbe
r
The check sum is a JIS8-coded hexadecimal representing the lower two digits of the sum of JIS8-coded
hexadecimal numbers up to ETX, with the exception of the first control code (STX or S0H).
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].
