Frame Structure - LG MASTER-K 120S Series User Manual

Chapter 8 Communication Functions

8.1.3 Frame Structure

1) Base Format
(1) Request frame(external communication device → MASTER-K120S main unit), (Max. 256 Bytes)
Header Station
(ENQ) number
(2) ACK Response frame (MASTER-K120S main unit → external communication device, when receiving data normally)
Header Station
(ACK) number
(3) NAK Response frame (MASTER-K120S main unit → external communication device,
Header Station
(NAK) number
Remark
1) Used control codes are as follows. Be familiar with the following control codes. Because they are importantly
used for communication.
Codes Hex value
ENQ
ACK
NAK
EOT
ETX
Command Command type
(max. 256 Bytes)
Command
Command
type
Command Command type
Name
H05 Enquire
H06 Acknowledge
H15 Not Acknowledge
H04 End of Text
H03 End Text
Structurized data area
Structurized data area or null code
when receiving data abnormally) (max. 256 Bytes)
Error code (ASCII 4 Byte)
Contents
Request frame initial code
ACK response frame initial code
NAK response frame initial code
Request frame ending ASCII code
Response frame ending ASCII code
8-5
Tail Frame check
(EOT) (BCC)
Tail Frame check
(ETX) (BCC)
Tail Frame check
(ETX) (BCC)