Siemens MC55 manual ME status indicated by status LED patterns, Atssync parameter mode=

MC55 AT Command Set

17.6 AT^SSYNC

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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 sufficient current to
	the GSM engine if required.
1	LED mode:
	Enables the SYNC pin to drive a status LED installed in your 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.

17.6.1ME status indicated by status LED patterns

The following table lists the possible patterns of status LED behavior, and describes 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 user 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 /	One or more GPRS contexts activated.
75 ms on / 3 s off
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 up
	or disconnecting a call.

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