Mitsubishi GOT1000 Series Connection Manual page 802

4 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.
5 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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19.5 Message Formats
19.5.7 Formats 14, 15 (GOT-F900 series microcomputer connection)
Section 19.4.5 Details and actions for errors (error codes) stored into SD2