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AL7020S, AL7024S Designer’s Guide
Doc. No. DG_7024E Altec Electronic AG Seite 7 / 32
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2.1 Block Diagramm of GSM Module
2.2 Supported Interfaces
The major hardware signal interfaces of the DF Series SocketGSM Modem are illustrated
in Figure 1-1.
Figure 2-1. Interface Block Diagram
• The RS232 Interface is connected via eight pins to the module.
• The SIM card is connected via 4 pins to the module.
• The Microphone is connected via 2 pins to the module.
• The Speaker is connected via one pin to the module.
• The Indicators are connected via two pins to the module.
• The power supply is connected via one pin to the module.
Socket
GSM
Modem
Module
TTL
Serial
interface
Antenna
Interface
5
3
Leds
2
1
1
Speaker
Microphone
Interface
1
External SIM
(Optional)
3
1