SIRETTA ZETA- P Series, Руководство по оборудованию

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42
ZETA-xxP Series
Hardware Manual
rev D
Download Latest Edition
ZETA-NLP Power Enhancements
The ZETA-NLP has been designed to operate in an ultra low power state as standard.
There have been a number of enhancements made to the functional operation of the
unit to help accommodate low power operation in normal use. When running in full
power mode the unit makes use of a very efficient power supply and all components
have been optimized for reduced current loss across the entire design.
ZETA-NLP Ultra Low Power Mode
The ZETA-NLP has a special mode of operation which forces the unit to drop down
to a ultra low power state where the modem is still operational and registered on the
network but is functionally asleep. This allows for the modem to remain connected to
the network and be ready to send and receive data using a fraction of the energy.
This ultra low power state is achieved by setting the following AT command to the
modem:
AT+CFUN=5
Once this command has been issued then the modem is ready to enter ultra low
power mode. To activate low power mode and put the modem in to a dormant state
the DTR line must be de-asserted on the serial port.
When the device has entered ultra low power mode the CTS line will be de-asserted
indicating that the device has gone into ultra low power state. At this point the serial
port is also deactivated and the modem will not respond to AT commands and will
appear to be off. To bring the modem back to normal power state and communicate
with the modem again it is necessary to assert the DTR line and the modem will leave
its dormant state and become fully active again for normal operation. When in the
dormant ultra low power state an incoming call request or incoming SMS will force
the modem to enter its full power mode and the modem is able to be used as normal.
This mode allows the modem to consume very little current whilst it is not in use
but be available for use locally by asserting the DTR line. The modem power on and
power lines will remain active throughout and can also be used to turn the modem
completely off.