LG GLOFA-GM Series User Manual page 273

Chapter 8 Exercising program
2) Operation setting
Connect 9-pin to 25-pin cable with dial-up modem and Cnet I/F module via RS-232C channel in the following
type.
[Table 8.6] Modem connection with Cnet I/F module
Cnet (9-pin) male
Pin No.
1
2
3
4
5
6
7
8
9
3) Modem initializing
If mode setting and connection between modem and Cnet I/F module via cable are completed, link phone line to
modem and let PLC powered on to initialize modem. Modem initializing is accomplished by modem initializing
command set previously in Cnet I/F module after powered on. If modem has been successfully initialized, Cnet
LED is displayed as below.
Cnet I/F module LED status in stand-by mode
NAK/PARITY
ERR/EVEN-ODD
MODEM/STOP
RS-232C
The figure above shows the case that modem has been initialized normally. If not initialized, TX LED will flash in
a cycle of 1 sec. in the figure. If so, refer to Chapter 4 How to connect to dial-up modem in the manual to shoot
the trouble.
Connection No. and signal direction
Name
CD
RXD
TXD
DTR
SG
DSR
RTS
CTS
RI
G4L-CUEA
RUN/BPS RUN/BPS
TX/BPS TX/BPS
RX/BPS RX/BPS
ACK/DATA ACK/DATA
NAK/PARITY
ERR/EVEN-ODD
RS-485/STOP
SYS-RUN SYS-ERR
RS-422
RUN/BPS : ALWAYS 'ON'
MODEM/STOP : ALWAYS 'ON'
SYS-RUN : DIMLY 'ON'
8-22
Modem side(25-pin) male
Pin No. Name
CD 8
RXD 3
TXD 2
DTR 20
SG 7
DSR 6
RTS 4
CTS 5
RI 22