LG MASTER-K 120S Series User Manual page 210

Chapter 8 Communication Functions
(5) Example
This example supposes that 2 byte H'AA15 is written in D000 of station No. 1 and BCC value is checked.
① Computer request Format (PC → MASTER-K120S main unit)
Format name Header
Frame (Example) ENQ
ASCII value H05
② For ACK response after execution of command (PC ← MASTER-K120S main unit)
Format name Header
Frame (Example)
ASCII value
③ For NAK response after execution of command(PC ← MASTER-K120S main unit)
Format name Header
Frame (Example) NAK
ASCII value H15
Station Command
Command
No. type
H01 w SB
H3031 H77 H5342
Station No.
ACK H01
H06 H3031
Station No. Command
01
H3031 H77
Device
Device
Length
H06 %DW0000
H3036 H254457303030
Command Command type
W SB
H77 H5342
Command type
W SB
H5342
8-20
Number of
Data Tail
data
H01 HAA15056F EOT
H414131353
H3031 H04
0353646
Tail Frame check
ETX
H03
Error code Tail
Error code (2) ETX
Error code (4) H03
Frame
check
BCC
BCC
Frame check
BCC