User's Manual

PCS3_HD_v01.000-03
Confidential / Preliminary
Page 34 of 101
2013-10-21
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PCS3 Hardware Interface Description
3.4 Power Saving
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3.4.3 Wake up from or Disabling Power Saving
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The RTS0 line can be used to wake up the module from its power saving SLEEP mode. RTS0
activation (high to low transition) may be employed to cut short pauses between listening to
paging messages. Following an RTS toggle the module will return to SLEEP mode 5 seconds
after the last character was sent over the interface. This default delay period can be configured
using the AT^SCFG parameter "MEopMode/PwrSave", <PwrSaveDelay>.
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If not regularly woken up from power saving (through network requirements or by means of
RTS toggling as described above), the power saving timeout recommended for the AT^SCFG
parameter "MEopMode/PwrSave", <PwrSaveTimeout> ensures that the module regularly
wakes up from its power saving state (SLEEP mode). It is recommended to configure a regular
module wake up, especially if the radio interface is switched off (Airplane mode) and the mod-
ule is connected via serial interface (i.e., AT^SDPORT=2) to an external application without di-
rect access to its RTS0 line (e.g., an application using standard Windows/Linux serial device
drivers).
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The AT^SCFG parameter "MEopMode/PwrSave", <PwrSaveMode> can be used to disable
power saving completely, i.e., the module will no longer enter SLEEP mode but remain in IDLE
mode instead. Please note that if this setting is used to avoid implementing hardware hand-
shaking on ASC0, it is mandatory to have RTS0 pulled down or left open (an internal pull down
is available).
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For more information on power saving and the appropriate AT^SCFG parameters to configure
the power save behavior see [1].