LG GLOFA-GM Series User Manual page 39

Chapter 4 Performance specification
1) How to connect RS-232C connector during modem connection
Cnet I/F module can communicate with devices of long distance as connected with modem. Modem and RS-
232C channel shall be connected as in [Figure4.4] below.
[Figure 4.4] Cable connection between RS-232C and modem
Cnet(9-PIN)
Pin No. Name
1
2
3
4
5
6
7
8
9 RI
[Note] No. 9, RI signal is not used in Cnet I/F module.
2) How to connect connector for RS-232C in null modem mode
In null modem, connector can be connected in 7-wire (with handshake) or 3-wire (without handshake) type.
[Figure 4.5] as of 7-wire connection shows connection drawing when controlling CD(Carrier Detect) signal line by
external devices.
[Figure 4.5] Connection of 7-wire type (with handshake)
Cnet(9-PIN)
Pin No. Name
1
2
3
4
5
6
7
8
9
Connection No. and signal direction
CD
RXD
TXD
DTR
SG
DSR
RTS
CTS
[Note]
Connection No. and signal direction
CD
RXD
TXD
DTR
SG
DSR
RTS
CTS
RI
4-7
Modem side(25-PIN)
Name Pin No.
CD 8
RXD 3
TXD 2
DTR 20
SG 7
DSR 6
RTS 4
CTS 5
RI 22
Computer/communication
devices
Name
CD
RXD
TXD
DTR
SG
DSR
RTS
CTS
RI