Mitsubishi Electric GT14 User Manual page 1440

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Error code list
When faulty, the error code is stored in SD2.
For details of error code stored in SD2, the error contents, cause and measures, refer to the following:
When an error other than those to be stored in SD2 occurs, at faulty, only the NAK response is executed.
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Precautions
(1) Batch reading/writing crossing over different devices
When using the batch read (0, A) or batch write (1, B) command, do not batch read/write crossing over different
devices.
This will cause an error response.
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61. MICROCOMPUTER CONNECTION (SERIAL)
61.5 Message Formats
61.4.5  Details and actions for errors (error codes) stored into SD2