Mitsubishi Electric MELSEC FX Series - Basic Formats of Dedicated Protocol

FX communication
Computer link 7
7-5
7
7.4 Basic Formats of Dedicated Protocol
There are two formats for the dedicated protocol; which may be selected by setting special data
register D8120(see chapter 6).
The difference between these two formats is whether CR
+
LF is added to each block or not.
The protocols are format 1 and format 4. (The format names conform to the computer link unit for
the A series programmable controller.)
Note:
*1 Whether or not to add sum check code can be selected using the communication format
special data register D8120.
*2 Whether or not to add terminating CR
+
LF codes is determined by the protocol selected.
(
)
Control code
Station No.
PLC No.
Command
Message wait
Character
Sum check code *1
Control code CR/LF *2
)
(
Basic format of transmitted data.