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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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