LG GLOFA-GM Series User Manual

Chapter 7 Communication function
7-35
7.2.2 Frame structure
1) Basic structure
A) Request frame (External communication devices → Cnet I/F module)
(Max. 256 Byte)
Header
(ENQ)
Station
No.
Command
Command
type
Structured data area
Tail
(EOT)
Frame check
(BCC)
B) ACK Response frame(Cnet I/F module → External communication devices, if data is received normally)
(Max. 256 Byte )
Header
(ACK)
Station
No.
Command
Command
type
structured data area or NULL
Tail
(ETX)
Frame check
(BCC)
C) NAK Response frame(Cnet I/F module → External communication devices, if data is received abnormally)
Header
(NAK)
Station
No.
Command
Command
type
Error code( ASCII 4 byte )
Tail
(ETX)
Frame check
(BCC)
D) Control codes of dedicated communication: [Table7.10] shows arranged control codes used as Header& Tail
of frame in dedicated communication as arranged. Other control codes than those are not used..
[Table7.10] ASCII control characters
Code HEX. value Abbreviation Contents
ENQ(Header) H05 Enquiry Start code of request frame
ACK(Header) H06 Acknowledge Start code of ACK response frame
NAK(Header) H15 Not Acknowledge Start code of NAK response frame
EOT(Tail) H04 End of Text End ASCII code of request frame
ETX(Tail) H03 End Text End ASCII code of response frame

LG GLOFA-GM Series Specifications

General

Brand	LG
Model	GLOFA-GM Series
Category	Controller
Language	English