2
Functional description
2.1 Architecture
fig. 5 Modem Functional architecture
2.2 RS232 serial link
2.2.1 General
presentation
The RS232 interface performs the voltage level adaptation (V24/CMOS
⇔
V24/V28) between the internal SIMCOM module (DCE) and the external world
(DTE).
The RS232 interface is protected (by ESD protection) against electrostatic
surges on the RS232 lines.
Filtering guarantees:
¾
EMI/RFI protection in input and output,
¾
Signal
smoothing.
A flexible 6-wire serial interface is available complying with RS232 protocol
signaling.
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