XT55 AT Command Set - Wireless Data Modules

XT55 AT Command Set2.8 AT+CFUNsby AT^SCFG="PowerSaver/Mode9/Timeout", (temporary wakeup).In contrast to SLEEP modes 5,6,7 and 8 assertion of RTS can also be used totemporarily wake up the ME. In this case too, activity time is at least the timeset with AT^SCFG="PowerSaver/Mode9/Timeout",. RTS can beactivated either from ASC0 or ASC1.ME exits SLEEP mode only, if AT+CFUN=1 is entered. (num)The parameter can only be used if the serial interface is enabled.Due to the command syntax, you need to enter parameter , followed by , where is only aplaceholder and has no effect. See examples below.[0] Placeholder for as stated above.1 ME resets and restarts to full functionality. After reset and restart, PIN 1authentication is necessary (AT+CPIN). If autobauding is enabled, it is recommendedto wait 3 to 5 seconds before entering the first AT command. Fordetails on autobauding refer to Section 4.7.1, Autobauding.Notes• If both serial interfaces ASC0 and ASC1 are connected, any functionality level set with AT+CFUN takes effecton 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=. Thebest approach to properly control SLEEP mode in this case is to issue the PSC messages described in [5],Section "Power saving control".• When a circuit-switched call is in progress, =7 or 8 or 9 can be activated without terminating the call.However, setting =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 youattempt to activate power saving while the SIM card is not inserted or the PIN is not correctly entered, theselected level will be set, though power saving does not take effect. For the same reason, power savingcannot be used if XT55 operates in Alarm mode. Furthermore, in order to accept incoming calls, SMS ornetwork 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 ifthe module is in full functionality mode or in CYCLIC SLEEP mode. If available, you can also take advantageof the status LED controlled by the SYNC pin (see AT^SSYNC and [2]). The LED remains "off" while the moduleis in any of the SLEEP modes. However, the module can wake up temporarily from power saving withoutleaving its CYCLIC SLEEP mode (without changing +CFUN ""), e.g. for a network scan after a loss ofradio coverage, or after receipt of serial data during CYCLIC SLEEP mode. During this "temporary wakeupstate" 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 returnto full functionality. This is a useful approach because, in this mode, the AT interface is not accessible.ExamplesEXAMPLE 1To check the level of functionality use the read command:AT+CFUN?+CFUN: 1Default mode after ME was restartedRemember that the AT interface is not accessible in NON-CYCLIC SLEEP mode. Consequently, the readcommand is only useful when the ME is set to full functionality or, when is set to 5, 6, 7, 8 or 9.AT+CFUN?+CFUN: 5CYCLIC SLEEP modeEXAMPLE 2To set the ME to NON-CYCLIC SLEEP mode enterAT+CFUN=0OKXT55_ATC_V03.03 Page 38 of 459 9/9/05Confidential / Released