Installing and putting a SINAUT modem into operation
6.2 GSM modem MD720-3
SINAUT ST7 Station control system - System Manual
228
System Manual, 05/2007, C79000-G8976-C178-06
6.2.1
Displays and connectors
The following figure shows the front view of the MD720-3 modem.
1
2
3
4
5
6
Connector for 24 V DC power supply
SET button for service functions
Antenna connector
Display elements
9-pin connector X1 (RS-232 female)
Order number of the modem
Front view of the MD720-3
modem
LED displays of the MD720-3
The following table summarizes the meaning and activity of the three LEDs on the front of
the modem.
Table 6-1
Meaning of the LEDs on the front of the MD720-3
LED
Status
Description
S, Q, C together
Flash on and off in sequence (fast)
Flash slowly (in sync)
Flash on and off in sequence (slow)
Flash fast (in sync)
Booting
Service mode
Update
Error
S (Status)
Flashes slowly
Flashes fast
Waiting for PIN input
PIN error/ SIM error
Q (Quality)
Flashes slowly
Flashes once at intervals
Flashes twice at intervals
Flashes three times at intervals
Always ON
OFF
Logging into GSM network
Field strength inadequate
Field strength adequate
Field strength good
Field strength very good
Waiting for PIN
C (Connect)
Flashing
Terminal mode activated
Flashes slowly: once per second; flashes fast: four times per second