Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 775)

APPENDIXES
Technical Appendixes
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WM_DEV_OAT_UGD_049 - 001 APPENDIXES August 23, 2007
3.7.2.3 Wavecom 32K Low Consumption Mode
This mode is based on a slower clock (32KHz) that is used instead of 13MHz clock.
Most of hardware blocks are stopped. It is aimed at reducing the power
consumption.
This mode is entered and left automatically if the feature is allowed.
To activate this mode, the "+W32K" AT command must be used.
It is authorized or not by peripherals (such as UARTs, Buses, …) and mainly driven by
GSM/GPRS protocols and Hardware Layers: this mode is entered when no
GSM/GPRS activity is required (no communication is in progress, no paging is in
progress, …).
Regarding UARTs and serial ports activity, 32K low consumption mode may be
entered as soon as V24 sleep mode global state is "asleep".
Wavecom Wireless CPU ® decides on its own to leave 32K low consumption at each
GSM/GPRS paging occasion.
During, this little time (which is operator dependant), UARTs are activated again so
that DTR state changes can be processed.
When this mode is activated, no data can be exchanged on RXD and TXD lines. Only
Wireless CPU ® status changes can be monitored (DTR and RTS changes) by the DCE.
3.7.3 Summary
To summarize the 3 definitions, the following schematics describe the functional links
between, serial port sleep mode single state manager, serial ports sleep mode global
state manager and W32K sleep mode manager.