XT65/XT75 Hardware Interface Overview
3.1 Operating Modes
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XT65_XT75_HO_v00.130
Page 19 of 67
2006-10-12
Confidential / Preliminary
3.1
Operating Modes
The table below briefly summarizes the various operating modes available for the module.
Table 5:
Overview of operating modes
Normal operation
GSM / GPRS SLEEP
Various power save modes set with AT+CFUN command.
Software is active to minimum extent. If the module was regis-
tered to the GSM network in IDLE mode, it is registered and pag-
ing with the BTS in SLEEP mode, too. Power saving can be
chosen at different levels: The NON-CYCLIC SLEEP mode
(AT+CFUN=0) disables the AT interface. The CYCLIC SLEEP
modes AT+CFUN=7 and 9 alternatingly activate and deactivate
the AT interfaces to allow permanent access to all AT com-
mands.
GSM IDLE
Software is active. Once registered to the GSM network, paging
with BTS is carried out. The module is ready to send and receive.
GSM TALK
Connection between two subscribers is in progress. Power con-
sumption depends on network coverage individual settings, such
as DTX off/on, FR/EFR/HR, hopping sequences, antenna.
GPRS IDLE
EGPRS IDLE
Module is ready for GPRS/EGPRS data transfer, but no data is
currently sent or received. Power consumption depends on net-
work settings and GPRS/EGPRS configuration (e.g. multislot
settings).
GPRS DATA
EGPRS DATA
GPRS/EGPRS data transfer in progress. Power consumption
depends on network settings (e.g. power control level), uplink /
downlink data rates, GPRS configuration (e.g. used multislot set-
tings) and reduction of maximum output power.
POWER DOWN
Normal shutdown after sending the AT^SMSO command.
Only a voltage regulator is active for powering the RTC. Software is not active. Interfaces
are not accessible. Operating voltage (connected to BATT+) remains applied.
Airplane mode
Airplane mode shuts down the radio part of the module, causes the module to log off from
the GSM/GPRS network and disables all AT commands whose execution requires a radio
connection.
Airplane mode can be controlled by using the AT commands AT^SCFG and AT+CALA:
• With AT^SCFG=MEopMode/Airplane/OnStart the module can be configured to enter
the Airplane mode each time when switched on or reset.
• The parameter AT^SCFG=MEopMode/Airplane can be used to switch back and forth
between Normal mode and Airplane mode any time during operation.
• Setting an alarm time with AT+CALA followed by AT^SMSO wakes the module up into
Airplane mode at the scheduled time.
Charge-only mode Limited operation for battery powered applications. Enables charging while module is
detached from GSM network. Limited number of AT commands is accessible. Charge-
only mode applies when the charger is connected if the module was powered down with
AT^SMSO.
Charge mode dur-
ing normal opera-
tion
Normal operation (SLEEP, IDLE, TALK, GPRS/EGPRS IDLE, GPRS/EGPRS DATA) and
charging running in parallel. Charge mode changes to Charge-only mode when the mod-
ule is powered down before charging has been completed.