Siemens MC55 User Manual download pdf (Page 41)

MC55 AT Command Set

2.8 AT+CFUN

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MC55_ATC_V01.05 Page 41 of 469 2/10/04

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8 CYCLIC SLEEP mode:

In this mode, the serial interface is shortly enabled during paging.

If characters are recognized on the serial interface, the ME stays active for 10

minutes after the last character was sent or received. ME exits SLEEP mode

only, if

AT+CFUN=1 is entered.

To ensure that power saving takes effect immediately, the ME stays active for

only 2 seconds after

<fun>=8 was entered.

9 CYCLIC SLEEP mode:

In this mode, the serial interface is shortly enabled during paging. If characters

are recognized on the serial interface, the ME stays active after the last char-

acter was sent or received for at least the time, which can be configured by

AT^SCFG="PowerSaver/Mode9/Timeout",<cfun9-timeout> (temporary

wakeup).

In contrast to SLEEP modes 5,6,7 and 8 assertion of RTS can also be used to

temporarily wake up the ME. In this case too, activity time is at least the time

set with

AT^SCFG="PowerSaver/Mode9/Timeout",<cfun9-timeout>. RTS

can be activated either from ASC0 or ASC1.

ME exits SLEEP mode only, if

AT+CFUN=1 is entered.

The parameter can only be used if the serial interface is enabled.

Due to the command syntax, you need to enter parameter

<fun>, followed by <rst>, where <fun> is only a

placeholder and has no effect. See examples below.

[0] Placeholder for

<fun> as stated above.

1 ME resets and restarts to full functionality. After reset and restart, PIN 1

authentication is necessary (

AT+CPIN). If autobauding is enabled, it is recom-

mended to wait 3 to 5 seconds before entering the first AT command. For

details on autobauding refer to chapter "4.7.1".

Notes

• If both serial interfaces ASC0 and ASC1 are connected, any functionality level set with AT+CFUN takes effect

on both of them. In Multiplex mode, the CFUN profile is shared by all multiplexer channels.

• If the ME is in Multiplexer mode, it is not recommended to activate SLEEP mode with

AT+CFUN=<fun>. The

best approach to properly control SLEEP mode in this case is to issue the PSC messages described in [5],

chapter "Power saving control".

• When a circuit-switched call is in progress,

<fun>=7 or 8 or 9 can be activated without terminating the call.

However, setting

<fun>=0, 5 or 6 during a circuit-switched call immediately disconnects this call.

• Please keep in mind that power saving works properly only when PIN authentication has been done. If you

attempt to activate power saving while the SIM card is not inserted or the PIN is not correctly entered, the

selected

<fun> level will be set, though power saving does not take effect. For the same reason, power sav-

ing cannot be used if MC55 operates in Alarm mode. Furthermore, in order to accept incoming calls, SMS or

network related URCs in SLEEP mode the ME must be registered when it enters the SLEEP mode.

• To check whether power saving is on, you can query the status with the read command AT+CFUN? only if

the module is in full functionality mode or in CYCLIC SLEEP mode. If available, you can also take advantage

of the status LED controlled by the SYNC pin (see

AT^SSYNC and [2]). The LED remains "off" while the mod-

ule is in any of the SLEEP modes. However, the module can wake up temporarily from power saving without

leaving its CYCLIC SLEEP mode (without changing +CFUN "

<fun>"), e.g. for a network scan after a loss of

radio coverage, or after receipt of serial data during CYCLIC SLEEP mode. During this "temporary wakeup

state" the LED will operate as if the ME was in full functionality mode.

• Recommendation: In NON-CYCLIC SLEEP mode, you can set an RTC alarm to wake up the ME and return

<rst>

(num)

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Siemens MC55 User Manual Page 41

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Siemens MC55 User Manual Page 41

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