Casio IT-2000W Technical Reference Manual page 256

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Category Detail Code
Protocol
Error
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Protocol
Error (File)
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Internal Error
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Command error (undefined function code).
Command error (undefined sub-function code).
Command error (not execute command).
Check sum error.
Command sequence error.
Sequence number error.
Other protocol error.
Parameter error.
Timeout error.
Read only file access error.
Parameter error.
Command buffer overflow.
Receive data analysis.
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Description