15
Chapter 4. Communication
z
End codes
End code Description Condition Operation
00 (Normal) Normal end*
• The transmitted message was normal. The value that was read is returned.
99 (Error) Undefined
command
• The first two characters in the
application layer were an undefined
command.
Only the end code is returned (no data is
appended).
40 (Error) Error in the
number of data
words
• A non-numeric character was used for
the number of data words.
• The number of data words was 0.
• The number of data words was greater
than the number of accessible data
words.
• A character other than a comma (“,”) was
immediately before the number of data
words.
Only the end code is returned (no data is
appended).
41 (Error) Data address error
• A non-numeric character was used for
the data address.
• The start data address was not
specified.
• The data address was 255 or lower.
• The data address was 32678 or higher.
• A character other than a comma (“,”) was
immediately before the data address.
Only the end code is returned (no data is
appended).
* If the start address was normal but a later address causes a data address error, “0” is returned as the data from the abnormal
address.
z
Maximum number of data words read per message
16
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