Motorola AT Commands G24-L Informações Técnicas descarregar pdf (Página 41)

Chapter 2: Hardware Interface Description

November 15, 2008 G24-L Module Hardware Description 15

Turning the G24-L Off

There are several ways to turn the G24-L off:

• Asserting the ON_N signal low for a minimum of 2 seconds.

• Setting the IGN signal low.

• AT command.

Turning the G24-L Off Using ON_N

Asserting the ON_N signal low for a minimum of 2 seconds will turn G24-L off. This will initiate

a normal power-off process, which includes disabling of all applications interfaces (UART, SIM

card, audio, etc.) and closing the network connection.

Figure 2-5 illustrates the power-off timings when using the ON_N signal.

Figure 2-5: ON_N Power Off Timing

Turning the G24-L Off Using IGN

The IGN signal may be used to power off G24-L only if it was also used to power it on. When the

IGN signal is set low, G24-L will turn off. This will initiate a normal power-off process, which

includes disabling of all applications interfaces (UART, SIM card, audio, etc.) and closing the

network connection.

The IGN signal will not power off G24-L before 30 seconds have elapsed since G24-L was

powered-on. This delay mechanism is implemented to protect G24-L from unexpected transients

on the IGN line during power up, particularly when applying vehicle cranking waveforms.

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Motorola AT Commands G24-L Informações Técnicas Página 41