User's Manual

Smart Machine Smart Decision
SIM5320A_Hardware Design_V1.01 2011-2-29
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3.3 UART Interface
SIM5320A provides a UART (universal asynchronous serial transmission) port. It consists of a flexible
7-wire serial interface. The module is as the DCE (Data Communication Equipment) and the client PC is
as the DTE (Data Terminal Equipment). AT commands are entered and serial communication is performed
through UART interface. The application circuit is in the following figures.
Figure 20: Full modem
Figure 21: Null modem