Specifications

AT Command Set
TC3X_ATC_01_V04.00 Page 179 of 204 29.05.2002
6.39 AT^SSYNC Configure SYNC Pin
The ^SSYNC command serves to configure the SYNC pin of the GSM engine's ZIF connector.
Please note that the pin may be assigned different functions, depending on the design of the host
application. TC35 Terminal supports only <mode>=1.
For detailed information on the SYNC pin refer to the "Hardware Interface Description" supplied with
your GSM engine. Before changing the mode of the SYNC pin, carefully read the technical
specifications.
Test command
AT^SSYNC=?
Response
^SSYNC: (list of supported <mode>s) OK
Parameter: See write command
Read command
AT^SSYNC?
Response
+SSYNC: <mode> OK
Parameter: See write command
Write command
AT^SSYNC=
<mode>
Note
Response
OK
Parameter
<mode> 0 TC35 / TC37 module: 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 accomodate current drain and
thus, supply sufficient current to the GSM engine if required.
TC35 Terminal: not applicable (do not select mode 0).
1 Enables the SYNC pin to control a status LED. On the TC35
Terminal, this is the LED placed on the front panel. If you use the
TC35 or TC37 module, the SYNC pin can control an LED installed
in your application. The options described below are applicable
both to the module and the terminal.
Note: Mode 1 is the default mode for the TC35 Terminal.
Note
The SYNC pin mode is stored to the non-volatile Flash memory, and thus retained
after Power Down.
Table 10: LED display modes of the ME (if <mode> = 1
LED mode Function
Off
*)
TC35/TC37: ME is off, in SLEEP, Alarm or Charge-only mode.
TC35 Terminal: ME is off or in SLEEP mode.
600 ms On / 600ms Off
*)
No SIM card inserted or no PIN entered, or network search in
progress, or ongoing user authentication, or network login in progress.
75ms On / 3s Off
*)
Logged to network (monitoring control channels and user interactions).
No call in progress.
On
Voice call: Connected to remote party.
Data call: Connected to remote party or exchange of parameters while
setting up or disconnecting a call.
*)
LED Off = SYNC pin low. LED On = SYNC pin high (if LED is connected as described in [1])