LG GLOFA-GM Series, Руководство пользователя, Страница: 206 / 358

Chapter 7 Communication function
7-87
2) Response format(for PLC of ACK response)
Format
Name
Header
Station
No.
Command Command type
DOMAIN_SIZE
(Dec 4 Bytes)
Tail Frame check
Frame(value) ENQ H01 P(p) UN(D) 00001298 ETX BCC
ASCII value H05 H3031 H50(70) H554E(44) H3030303031323938 H03
9
DOMAIN_SIZE means the size of the domain saved in PLC. This size is of ASCII code converted from
decimal. Station number, commands, and type of command are the same as in computer request format.
9
BCC : When command is one of lower case(p), only one lower byte of the value resulted by adding 1 byte
each to ASCII values from ACK to ETX is converted into ASCII, added to BCC, and sent. Surely send
upload command within I sec. after receiving this frame.
3) Response format(for PLC of NAK response)
Format
Name
Header
Station
No.
Command Command type
Error code
(HEX 2 Bytes)
Tail Frame check
Frame (Ex.) NAK H10 P(p) UN H1132 ETX BCC
ASCII value H15 H3130 H50(70) H554E H31313332 H03
9
Station number, commands, and type of command are the same as in computer request format.
9
BCC : When command is one of lower case(p), only one lower byte of the value resulted by adding 1 byte
each to ASCII values from NAK to ETX is converted into ASCII, added to BCC, and sent.
9
Error code is HEX and 2 bytes(ASCII code, 4 bytes), which indicates type of error.
4) Example of use
In case Domain name is set to PLC_pgm.
(Computer request format)
Format
Name
Header
Station
No.
Command
Command
type
DM_LEN DM_NAME Tail Frame check
Frame (Ex.) ENQ H01 P(p) UN H07 PLC_pgm EOT BCC
ASCII value H05 H3031 H50(70) H554E H3037 H504C435F52570676D H04