NMX920 OEM Integrators Guide
Page 12 of 21
6.4. Shutdown
The NMX920 can be placed back into
POWER-OFF MODE
by issuing the MASC
FO command.
The NMX920 will terminate MOBITEX network activities, send an INACTIVE to the
network, issue the MASC FO reply and shut down power to internal devices to
enter
POWER-OFF MODE
. It is important that the correct shutdown procedure be
used each time the modem is shutdown to prevent lose of buffered messages, and
to keep the network informed of the modem’s status.
The NMX920 can toggle between
EXPRESS/BATTERY SAVE MODE
and
POWER-OFF MODE
by repeating sections 6.3 and 6.1.
6.5. Removal of power
The NMX920 controls the internal distribution of power from the PWR pins using
digitally controllable switches and regulators. While there is no mechanism for
completely disconnecting power from the NMX920 without externally removing the
power source from the interface, the NMX920 can enter a very low power state
(
POWER-OFF MODE
) under direct control. It is preferable to use this low power
mode rather than disconnecting power from the
External Interface
.
If power must be removed from the
External Interface
the following procedure
should be followed to ensure data integrity and network compatibility:
1. Shut down NMX920 via the MASC FO command.
2. Wait for MASC FO response from the NMX920 to indicate that it has shut
down.
3. Remove electrical power from the interface
Following this procedure will ensure that the network is properly notified and no
buffered messages are lost.
