Chapter 17 – Hardware-Related Commands

Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 280

17.4 AT^SSYNC Configure SYNC Pin

Description: The AT^SSYNC command serves to configure the SYNC pin of the application interface. Please

note that the SYNC pin may be assigned different functions: Depending on the design of the host

application, the pin can either be used to indicate the current consumption in a transmit burst or

to drive a status LED connected to the specified pin.

Syntax: Test Command: AT^SSYNC=?

Response: ^SSYNC:list of supported <mode>s

Read Command: AT^SSYNC?

Response: ^SSYNC:<mode>

Write Command: AT^SSYNC=<mode>

Response: OK

Parameter:

<mode> Operation mode of the SYNC pin. Setting is stored in non-volatile memory.

0 SYNC mode:

Enables the SYNC pin to indicate growing power consumption during a transmit burst.

You can make use of the signal generated by the SYNC pin, if power consumption is your

concern. To do so, ensure that your application is capable of processing the signal. Your

platform design must be such that the incoming signal causes other components to draw

less current. In short, this allows your application to accommodate current drain and thus,

supply sufficient current to the GSM engine if required. Default.

1 LED mode:

Enables the SYNC pin to drive a status LED installed in your application.

The coding of the LED is described in "ME Status Indicated by Status LED Patterns"

below.

2 LED mode:

Like <mode>=1, but additionally, enables different LED signals in SLEEP mode depending

on the status of PIN authentication and network registration. See AT+CFUN for SLEEP

mode details.

ME Status Indicated by Status LED Patterns

The following table lists the possible patterns of status LED behavior and describes the ME operating status

indicated by each pattern if AT^SSYNC parameter <mode>=1 and <mode>=2. To better monitor the operating

states while power saving is enabled, we recommend that priority be given to <mode>=2.

During the transition from one LED pattern to another the "on" and/or "off" periods of the LED may vary in length.

This is because an event that triggers the change may occur any time and, thus, truncate the current LED

pattern at any point.

Modes of the LED and indicated ME functions.

LED Behavior ME operating status if AT^SSYNC=1 ME operating status if AT^SSYNC=2

Permanently off ME is in one of the following modes:

POWER DOWN mode

AIRPLANE mode

NON-CYCLIC SLEEP mode

CYCLIC SLEEP mode with no

temporary wake-up event in progress

ME is in the following mode:

POWER DOWN mode

AIRPLANE mode.

600 ms on / 600ms off Limited Network Service: No SIM card

inserted or no PIN entered, or network

search in progress, or ongoing user

authentication, or network login in

progress.

Same as for AT^SSYNC=1

75 ms on / 3 s off IDLE mode: The mobile is registered to

the GSM network (monitoring control

channels and user interactions). No call

is in progress.

Same as for AT^SSYNC=1

75 ms on / 75 ms off /

75 ms on / 3 s off

One or more GPRS contexts activated. Same as for AT^SSYNC=1

500 ms on / 25 ms off Packet switched data transfer in

progress.

Same as for AT^SSYNC=1

Table continued on next page

1 2 ... 275 276 277 278 279 280 281 282 283 284 285 ... 307 308

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