LG GLOFA-GM Series User Manual page 319

Chapter 9 Diagnosis function
9.1.2 Procedure of Loop-Back self diagnosis
Procedure of Loop-Back self diagnosis is as follows.
1) Let RS-232C/RS-422 channels connected respectively as shown in [Figure 9.2] & [Figure 9.3].
2) Set operation mode setting switch to Loop-Back Test mode.
3) After self-diagnosis is started as powered on, check LED display per channel if normal or not.
4) Self-diagnosis will be repeated until powered off.
[Figure 9.2] RS-232C cable connection
Cnet (9-PIN)
Pin No. Name
1
2 RXD
3 TXD
4 DTR
5
6 DSR
7 RTS
8 CTS
9
[Figure 9.3] RS-422 cable connection
Cnet
Pin No. Name
1
2
3
4
5
6
Connection No. and Signal direction
CD
SG
RI
Cable connection
RDA
RDB
SDA
SDB
S.G
F.G
9-2