Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 752)

APPENDIXES
Technical Appendixes
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WM_DEV_OAT_UGD_049 - 001 APPENDIXES August 23, 2007
3 Technical Appendixes
3.1 Working Modes
3.1.1 Working Mode Description
Wireless CPU
® can work in different modes. Each one is characterized by:
• power consumption,
• Open AT
® power processing,
• feature availability.
3.1.1.1 Fast Idle Mode
This is the default mode for Wireless CPU ® .
There is no feature restriction in this mode.
3.1.1.2 Slow Idle Mode
This mode is a low power consumption mode. In this mode the Wireless CPU ® has
restricted access to peripheral interfaces, thereby UARTs, USB, SPIs, I2C, GPIOs,
ADCs and Buzzer are not available.
To enable or disable this mode use AT+W32K command.
The mode activation and deactivation is initiated when the customer device is
connected to the serial interface (DTE). DTR pin must be pulled DOWN for requesting
activation of the Slow idle mode. To deactivate this mode DTR pin must be pulled UP.
All details are described in chapter 3.7 'Specifications of Power down Control
mechanism through serial Ports (physical Ù RS232 ports or virtual Ù CMUX ports)'.
When this mode is activated, the Wireless CPU ® requires 1 to 15 seconds to power
down consumption. In this state, a 32 kHz internal clock is used during the inactivity
stage.
Then, the Wireless CPU ® can automatically wake up on unsolicited events such as:
• GSM paging,
• external interruption,
• key press,
• alarm,
• Open AT
® timer expiration.
During the wake up period, the Wireless CPU ® will have the same characteristic as
Fast idle mode in terms of power consumption and Open AT ® power processing.
The Wireless CPU ® automatically switches back to idle state after all Open AT ®
treatments.