Specifications

TC35i AT Command Set
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TC35i_ATC_V01.05 Page 247 of 278 04.08.2003
7.48 AT^SSYNC Configure SYNC Pin
The ^SSYNC command serves to configure the SYNC pin of the TC35i application interface. Please
note that the pin may be assigned different functions, depending on the design of the host applica-
tion.
For detailed information on the SYNC pin of the TC35i module refer to [1]. 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>
Response
OK
Parameter
<mode> 0 Enables the SYNC pin to indicate growing power consump-
tion 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 accom-
modate current drain and thus, supply sufficient current to
the GSM engine if required.
Note: Mode 0 is default mode of the TC35i module.
1 Enables the SYNC pin to control a status LED. On the
TC35i Terminal, this is the LED placed on the front panel. If
you use the TC35i module, the SYNC pin can control an
LED installed in your application.
The LED functions described in Table 17 are applicable
both to the module and the terminal.
Note: Mode 1 is the default mode of the TC35i Terminal.
Note
The SYNC pin mode is stored to the non-volatile Flash memory, and thus
retained after Power Down.
Table 17: Functions of the ME indicated by status LED (if <mode> = 1):
LED status Function
Off
TC35i module: ME is off or running in SLEEP, Alarm or Charge-only mode.
TC35i 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.
75 ms On / 3 s Off Logged to network (monitoring control channels and user interactions). No
call in progress.
On Depending on type of call:
Voice call: Connected to remote party.
Data call: Connected to remote party or exchange of parameters while set-
ting up or disconnecting a call.