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The transmission message and reception message have the following struc-ture.
Header Address Length Data Error check Terminator
Item Function
Header Set the data that indicates the beginning of the message.
Address Set the node number or other identifier that indicates the
destination for the message.
Length The data length (number of bytes) is added automatically.
Data Set the message contents.
Error check code Set SUM, LRC, or CRC as the error check code. The specified
error check code will be added automatically when transmitting.
When receiving, error control will be performed automatically
based on the error check code specified in the message and
the specified amount (length) of data will be received.
Terminator Set the data that indicates the end of the message.
The following attributes can be set for each item in the transmission or receptionmessage. The abbreviation “R M” stands for reception message and “T M”stands for transmission message.
Data attribute Header Address Length Data Error check Terminator
T M R M T M R M T M R M T M R M T M R M T M R M
Constant ASCII
“”
HEX
[]
Yes Yes Ye s Yes --- --- Yes Yes --- --- Ye s Yes
Special characters
CR, STX, etc. Ye s Yes --- --- --- --- Yes Yes --- --- Yes Ye s
No variable
conversion First-order equation
using variable (N) --- --- Yes Yes --- --- Ye s Yes --- --- --- ---
Wild card () --- --- --- Yes --- --- --- Yes --- --- --- ---
Read word (R) --- --- Yes Ye s --- --- Yes Yes --- --- --- ---
Write word (W) --- --- --- Ye s --- --- --- Yes --- --- --- ---
Automatic variable:
LNG --- --- --- --- Yes Yes --- --- --- --- --- ---
Automatic variable:
SUM, LRC, and CRC --- --- --- --- --- --- --- --- Ye s Yes --- ---
Variable
ASC First-order equation
using variable (N) --- --- Yes Yes --- --- Ye s Yes --- --- --- ---
conversion Wild card () --- --- --- Yes --- --- --- Yes --- --- --- ---
Read word (R) --- --- Yes Ye s --- --- Yes Yes --- --- --- ---
Write word (W) --- --- --- Ye s --- --- --- Yes --- --- --- ---
Automatic variable:
LNG --- --- --- --- Yes --- --- --- --- --- --- ---
Automatic variable:
SUM, LRC, and CRC --- --- --- --- --- --- --- --- Ye s --- --- ---
Variable
HEX First-order equation
using variable (N) --- --- Yes Yes --- --- Ye s Yes --- --- --- ---
conversion Wild card () --- --- --- Yes --- --- --- Yes --- --- --- ---
Read word (R) --- --- Yes Ye s --- --- Yes Yes --- --- --- ---
Write word (W) --- --- --- Ye s --- --- --- Yes --- --- --- ---
Automatic variable:
LNG --- --- --- --- --- Yes --- --- --- --- --- ---
Automatic variable:
SUM, LRC, and CRC --- --- --- --- --- --- --- --- --- Yes --- ---
Transmission/ReceptionMessage Structure
The Protocol Macro Function Section 8-6