MC55 AT Command Set
17.6 AT^SSYNC s
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MC55_ATC_V01.05 Page 438 of 469 2/10/04
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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 suffici ent current to
the GSM engine if required.
1 LED mode:
Enables the SYNC pin to drive a status LED installed in y our application
according to the specifications provided in [2].
The coding of the LED is described in Chapter 17.6.1.
Note
• The selected <mode> is stored to the non-volatile Flash memory, and thus retained after Power Down.
17.6.1 ME status indicated by status LED patterns
The following table lists the possible patterns of status LED behavior, and d escribes the ME status indicated by
each pattern for <mode>=1
Table 17.2: Modes of the LED and indicated ME functions
LED behavior AT^SSYNC parameter <mode>= 1
Off ME is off, or ME is running in Alarm mode or Charge-only mode or SLEEP mode
(cf. AT+CFUN).
600 ms on / 600ms off ME is in full functionality mode (AT+CFUN= 1) and no SIM card inserted or no PIN
entered; or the ME is in SLEEP mode or full functionality mode while network
search, user authentication or network login are in progress.
75 ms on / 3 s off ME is registered to the GSM network (monitoring control channels and u ser inter-
actions). No call is in progress.
ME is in full functionality mode (AT+CFUN= 1) or in a "temporary wake-up state"
after characters have been detected on the serial interface in CYCLIC SLEEP
mode. The AT interface is fully accessible.
75 ms on / 75 ms off /
75 ms on / 3 s off
One or more GPRS contexts activated.
Flashing LED is on when data packets were exchanged in GPRS online mode during the
last second.
On Depending on type of call:
Voice call: Connected to remote party.
Data call: Connected to remote party or exchange of parameters while setting u p
or disconnecting a call.