Mitsubishi Electric MELSEC FX Series - Control Protocol Parts Explained

FX communication
Computer link 7
7-8
7.4.3 Control Protocol Parts Explained
This is to explain the content of data set in each control procedure.
1 ) Control codes
The control codes are listed below.
a ) The programmable controller initializes the transmission sequence when receiving any
one of ENQ, ACK, NAK, and starts.
b ) When EOT, or CL code is received as follows, the programmable controller initializes the
transmission sequence. At this time, no response is made from the programmable
controller.
Signal
Code
(Hexadecimal)
Description Signal
Code
(Hexadecimal)
Description
STX 02H Start of Text LF 0AH Line Feed
ETX 03H End of Text CL 0CH Clear
EOT 04H End of Transmission CR 0DH Carriage Return
ENQ 05H Enquiry NAK 15H Not Acknowledge
ACK 06H Acknowledge
Format 1 Format 4
C
L
Computer
Programmable
controller
or
E
O
T
C
L
Computer
Programmable
controller
or
E
O
T
C
R
C
R
L
F
L
F