Cyclic Sleep Mode (At+Cfun=5, 6, 7, 8); Cyclic Sleep Mode At+Cfun=9 - FALCOM I56 Hardware Description

I65/I56I HARDWARE DESCRIPTION
from the base station and then immediately resumes power saving. Level 0 is
called NON-CYCLIC SLEEP mode, since the serial interface is not
alternatingly made accessible as in CYCLIC SLEEP mode.
The first wake-up event fully activates the module, enables the serial interface
and terminates the power saving mode. In short, it takes the GSM/GPRS
engine of the I56/I56i back to the highest level of functionality <fun>=1.
RTS_0 is not used for flow control, but to wake up the module.

5.9.3 CYCLIC SLEEP mode (AT+CFUN=5, 6, 7, 8)

The major benefit over the NON-CYCLIC SLEEP mode is that the serial
interface is not permanently blocked and that packet switched calls may go on
without terminating the selected CYCLIC SLEEP mode. This allows the
GSM/GPRS engine of the I56/I56i to become active, for example to perform a
GPRS data transfer, and to resume power saving after the GPRS data transfer is
completed.
The CYCLIC SLEEP modes give you greater flexibility regarding the wake-up
procedures:
For example, in all CYCLIC SLEEP modes, you can enter AT+CFUN=1 to
permanently wake up the module. In modes CFUN=7 and 8, the GSM/GPRS
engine of the I56/I56i automatically resumes power saving, after you have sent
or received a short message or made a call. CFUN=5 and 6 do not offer this
feature, and therefore, are only supported for compatibility with earlier
releases. Please refer to
The CYCLIC SLEEP mode is a dynamic process which alternatingly enables
and disables the serial interface. By setting/resetting the CTS signal, the
module indicates to the application whether or not the UART is active. The
timing of CTS is described below.
Both the application and the module must be configured to use hardware flow
control (RTS/CTS handshake). The default setting of the GSM/GPRS engine
of the I56/I56i is AT\Q0 (no flow control) which must be altered to AT\Q3.
See [4] for details.

5.9.4 CYCLIC SLEEP mode AT+CFUN=9

Mode AT+CFUN=9 is similar to AT+CFUN=7 or 8, but provides two
additional features:
RTS_0 is not intended for flow control (as in modes AT+CFUN=5,6,7
or 8), but can be used to temporarily wake up the module. This way, the
module can quickly wake up and resume power saving, regardless of the
CTS timing controlled by the paging cycle.
The time the module stays active after RTS was asserted or after the last
character was sent or received, can be configured individually using the
command AT^SCFG. Default setting is 2 seconds like in AT+CFUN=7.
The entire range is from 0.5 seconds to 1 hour, selectable in tenths of
seconds. For details see [4].
This confidential document is the property of FALCOM GmbH and may not be copied or circulated without permission.
for a summary of all modes.
Table 18
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