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Smart Machine Smart Decision
Tona
The time to power on again after Tpw-
0
-
-
s
User can also use the AT command
“
AT+CPOF
”
to power down the module. After that, the AT commands
cannot be executed any longer. The module enters the POWER DOWN mode, only the RTC is still active.
For details, refer to
Document [1]
.
3.3
UART Interface
SIM5215&SIM5216 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.
In order to prevent the UART signals of the module damaged due to voltage spikes or ESD, some resistors
can be added on UART signals. The values of resistors are
adjusted
according to the actual circuit.
The application circuit is in the following figures.
Figure 18: Full modem
Figure 19: Null modem
SIM5215&SIM5216_Hardware Design_V2.02
2012-08-31
28
Содержание SIM5215
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