Siemens SINAUT ST7 - GSM;GPRS Modem MD720-3; Displays and Connectors

Installing and putting a SINAUT modem into operation
5.3 GSM/GPRS modem MD720-3
Station control system
184 System Manual, 07/2009, C79000-G8976-C178-07
5.3 GSM/GPRS modem MD720-3
Introduction
This section describes the design of the MD720-3 modem, its connectors and display
elements.
5.3.1 Displays and connectors
The following figure shows the front view of the MD720-3 modem.
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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 5- 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