LG GLOFA-GM Series User Manual page 193

Chapter 7 Communication function
1) Request format(PC -> PLC)
Format
Header
Name
Frame (Ex.) ENQ
ASCII value H05
PI_N_LEN is where the number of PI name's characters is displayed.
PI_N_NAME is where PI name is displayed.
When PI name is executed as specified, the max.number of characters is 16.
If no name is required, use D instead of N in command type. If D has been used, PI_N_LEN and
PI_N_NAME are unnecessary.
PI_N_NAME shall be the name to specify or default name of 'P_Program'.
BCC : When command is one of lower case(m), 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.
[Table 7.22] Command type
RN(D) Starts PLC start-up(RN = PI name, RD= Default)
PN(D) Temporarily stops what is in operation. (PN = PI name, PD= Default)
SN(D) Switches temporarily stopped PLC to program mode (stops it). SN = PI name, SD = Default
EN(D) Restarts temporarily stopped PLC. (EN = PI name, ED= Default)
2) Response format(for PLC of ACK response)
Format
Name
Frame (Ex.)
ASCII value
Station number, commands, and type of command are the same as in computer request format.
BCC : When command is one of lower case(m), 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.
Station No. Command
H10 M(m)
H3130 H4D(6D)
Header Station No.
ACK H10
H06 H3130
Command type PI_N_LEN
RN H04
H524E H3034
Command Command type
M(m) RN
H4D(6D) 524E
7-74
Frame
PI_N_NAME Tail
check
LGIS EOT BCC
H4C474953 H04
Tail Frame check
ETX BCC
H03