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Chapter 8 Communication Functions
8-17
(5) Example
This example supposes that "HFF" is written in M230 of station No. 1 and BCC value is checked.
①
Computer request format (PC
→
MASTER-K120S main unit)
Format name
Header Station No. Command
Command
type
Number of
blocks
Device Length Device Name
Data
Tail
Frame
check
Frame (Example) ENQ H01 w
SS H01 H06 %MW230
H00FF EOT BCC
ASCII value
H05
H3031
H77 H5353
H3031 H3036
H254D5732
3330
H30304646 H04
②
For ACK response after execution of command(PC
←
MASTER-K120S main unit)
Format name
Header
Station No.
Command
Command type
Tail
Frame check
Frame (Example)
ACK H01 w
SS ETX
BCC
ASCII value
H06
H3031
H77
H5353
H03
③
For NAK response after execution of command(PC
←
MASTER-K120S main Unit)
Format name
Header
Station No.
Command
Command type
Error code
Tail
Frame check
Frame (Example)
NAK H01 w SS
Error code (2)
ETX
BCC
ASCII value
H15
H3031
H77
H5353
Error code (4)
H03