LG GLOFA-GM Series User Manual page 64

Chapter 4 Performance specification
LED status during normal communication
RUN/BPS
TX/BPS
RX/BPS
ACK/DATA
NAK/PARITY
ERR/EVEN-ODD
MODEM/STOP
SYS-RUN
RS-232C
4.4.2.5 Troubleshooting for dial-up modem communication
1) Modem communication of module can be checked if operated normally through LED display. Refer to Checklist
in [Table4.6] to shoot the trouble.
[Table4.8] Checklist for module's LED
LED type If normal
RUN ON
Flash once
initially
TX
Flash if in
Transmission
Flash if in
RX
receiving
G4L-CUEA
RUN/BPS
TX/BPS
RX/BPS
ACK/DATA
NAK/PARITY
ERR/EVEN-ODD
RS-485/STOP
SYS-ERR
RS-422
If abnormal
OFF
Flash
continuously
in a cycle of 1
second
No flash
No flash
RUN/BPS : always 'ON'
TX/BPS : if in transmission, 'ON'
RX/BPS : if in receiving, 'ON'
MODEM/STOP : always 'ON'
SYS-RUN : dimly 'ON'
1) ..Run RS-232C channel operation using Frame Editor
1) Check cable connection between module and modem
2) Reset modem initializing command referring to modem
manual
3) Tx/Rx LEDs shall initially flash once to be normal
1) Check cable connection between module and modem
2) If in user mode, check setting of PLC program and frame
3) If in dedicated mode, check setting of station No.
1) Check if phone line is connected to line terminal of modem
2) Check status of public line
3) Check if data is transmitted from the other station's modem
4) Check cable connection between module and modem if RX
LED of modem flashes while LED of module doesn't flash.
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Action to take