> 2.19.1 | Power down the ME

> This section comprises the subsections Description, Used AT Commands, Flow Chart, Hints and Example. To move to these subsections please use the Navigation Frame or the appropriate buttons on the toolbar.

> 2.19.1.1 | Description

> The best and safest approach to turn off the ME is using the AT command AT^SMSO. This procedure lets the ME log off from the network and allows the software to enter a safe state before disconnecting the power supply. Low level of the ME’s output pin VDD indicates that the procedure has completed and the ME has entered the POWER DOWN mode. If supported by the type of GSM module, the URC “^SHUTDOWN” will additionally notify that the ME is about to enter the POWER DOWN mode.
> From POWER DOWN mode, the ME can be restarted to normal operation when the corresponding hardware pin is tied to ground. Depending on the type of module, this is either the IGT pin or the KEY7 pin. See also Section 2.20.3.
> For further details on the POWER DOWN mode and instructions of how to enter and quit the mode see [1] and [2].

> 2.19.1.2 | Used AT commands

> Command | Explanation
> AT^SMSO | Switch off mobile station

> For further details about the commands see [2].

> 2.19.1.3 | Flow chart

> Figure 176: Power down the ME

> 2.19.1.4 | Hints

> • | After using the command AT^SMSO it is not possible to send any other AT commands.

> • | The second way to verify that the ME is turned off, is to monitor the VDD pin.

> • | The low state of the VDD pin definitely indicates that the modul ist switched off.

> 2.19.1.5 | Example

> ***************************************
> Comment: Power down the ME
> ***************************************
> Subscr 1 Send: AT^SMSO
> Subscr 1 Receive: AT^SMSO
> Subscr 1 Receive: ^SMSO: MS OFF
> Subscr 1 Receive:
> Subscr 1 Receive: OK
> Subscr 1 Receive: ^SHUTDOWN (not supported by all products)