Casio IT-2000W - Manual (Page 256)

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End Code
Category Detail Code
Protocol
Error
Description
01h 00h Command error (undefined function code).
01h 01h Command error (undefined sub-function code).
01h 02h Command error (not execute command).
01h 03h Check sum error.
01h 04h Command sequence error.
01h 05h Sequence number error.
01h 06h Other protocol error.
01h 07h Parameter error.
01h 08h Timeout error.
Protocol
Error (File)
04h 00h Read only file access error.
Internal Error
0Fh 01h Parameter error.
0Fh 02h Command buffer overflow.
0Fh 03h Receive data analysis.