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Chapter 4 – Interfaces

Wireless ModemModule GSM/GPRS Developer’s Guide 33

Chapter 4 – Interfaces

This chapter describes the ModemModule interfaces.

• Flashing LED

• SIM Interface

• RF Interface

• DTE/DCE Interface Rates

Flashing LED

The flashing LED signal is used to indicate the working mode of the ModemModule.

Table 4-1: LED and ModemModule Status

Signal ModemModule Status

OFF Download mode or switched OFF>

Continuously lit Switched ON (not registered on the network)ON

Flashing Switched ON (registered on the network)

SIM Interface

The internal SIM interface of the SocketModule supports 3V SIMs only.

Note: This interface is fully compliant with GSM 11.11 recommendations concerning the SIM functionality.

Five Signals Are Available

SIMVCC: SIM power supply.

SIMRST: reset.

SIMCLK: clock.

SIMDATA: I/O port.

SIMPRES1 SIM card detect.

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