Mitsubishi Melsec-L Series User Manual page 120

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POINT
Only one Length can be placed in a packet.
When there is no element other than a Length, an element error occurs.
When the number of digits of calculation result is greater than that specified in
"Data Length", digits greater than the specified digit are omitted (ignored).
Example) When "2 bytes" is specified in "Data Length" and the calculation result
is "123 bytes", the data length is considered as "23".
When any of a Non-conversion variable (Variable length), Conversion variable
(Variable number of data), Conversion variable (Fixed number of data/Variable
number of digits 1), and Non-verified reception (Variable number of characters)
is placed behind a Length and they are not included in the calculation range of
the Length, place any of the following data immediate after the Non-conversion
variable (Variable length), Conversion variable (Variable length) or Non-verified
reception.
Static Data
Terminator
Check code + Static Data
Check code + Terminator
When "Code Type" is "ASCII Hexadecimal", a corresponding packet is regarded
as a mismatch packet if a string except for "0"-"9" "A"-"F" "a"-"f" is received.
When "Code Type" is "ASCII Decimal", a corresponding packet is regarded as a
mismatch packet if a string except for "0"-"9" is received.
1: Excluding a case where "Number of data" is '1' and "Delimiter" is not 'No delimiter'.
9 DATA COMMUNICATION USING THE PREDEFINED PROTOCOL
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