Specifications

OPERATIONS
Page 46 MRC-565 Packet Data Radio Operations & Maintenance
seconds to wake the unit up. Applying an external voltage to the Ignition input (IN2+) can also
be used to turn on the power within 10 seconds of applying the voltage.
This mode has the advantage that the receiver is always active, which means that it can respond
to Master station Idle probes at any time. Wake up time to a receive signal is a few milliseconds
5.2.4.3 LPM,ALARM
This mode is the same at LPM,SP except that when there is no data to transmit, the entire radio
receiver is turned off, and current drops to about 50 ma. This mode also uses an interval timer to
wake up the CF processor every 10 seconds. In addition to the timer an internal alarm clock can
also be programmed to wake the CF up at a specific interval. Use the following command to set
an alarm clock interval:
PTW,NN
Applying an external voltage to the Ignition input (IN2+) can also be used to turn on the power
within 10 seconds of applying the voltage.
Where NN is a wake up interval in seconds. Wake up time from this mode is less than 1 second.
5.2.4.4 LPM,PWR
In this mode the CF is held in LPM,SP state until all data is transmitted. It then turns power off
to all internal circuitry except the Alarm clock. In this mode the internal timer is not power on,
so the only way to wake up the unit is to set the PTW to wake up the unit at a specific interval
using the following command:
PTW,NN
Where NN is the wake up interval.
In the is mode you must also set an power time out interval which turn power off:
PTO,XXX
Where XX is the time before power is turned off.
You can also turn power onto to the unit by applying an external voltage(+3 to +12V) to the
Ignition input (IN2+) can also be used to turn on the power at any time.
A summary of the power modes and the expected current while operating in each mode.