Specifications

Table Of Contents
OPERATIONS
Page 45 MRC-565 Packet Data Radio Operations & Maintenance
5.2.3 Setting the Operating Role
To see what ROLE the device is set to enter:
ROLE
The Role must be set to LOS for LOS networks.
5.2.4 Setting the Power Mode
The MRC-565 has several power modes that determine the DC Power consumed when the unit is
in the non-transmit state. These modes do not affect the DC power consumed when in the
transmit state.
There are four Low Power Modes.
5.2.4.1 LPM,OFF
In this mode the unit operates without going to low power modes. A typical current draw for this
mode is about 130 ma, although during certain software functions the current may get as high as
180 ma. These function include FALSH download. The current can be reduced about 20 ma if
the Ethernet interface is not required. To turn off the interface use the turn off any ports that use
the Ethernet port using the ASSIGN command.
ASSIGN,E1F1,OFF
5.2.4.2 LPM,SP
In this mode, the CF and DSP processors operates in a low power mode. The receiver front end
is always active, and will produce an interrupt that wakes up the DSP when RF energy is
detected in the receiver bandwidth (10 kHz). When the DSP receives a wakeup interrupt, it will
demodulate the received signal and start looking for the Correlation pattern that is the front end
of all MBNET 200 data frames. When Correlation is detected, the DSP will wake the CF by
raising the DSP_SP. In this manner the MRC-565 can operate in a relatively low power mode
while still able to respond to received signals from the Master. Once the unit receives and
processes the Received data, it will go back to the LPM.
It should be noted that unit will be in the LPM even if the TXQ has data to send. This means
there is relatively low receive current even when there is data to send as opposed to the MCC
545B LPM which operates at full receive current until all data is sent.
An interrupt timer is built into the hardware that wakes up the CF and DSP every 10 seconds.
This allows an operator typing on the keyboard (holding down the "period" key for about 10