
IDP 800 Terminal Series - Hardware Guide
T209, Version 01 6 © SkyWave Proprietary
Table 2
Satellite Modem Operating Modes
Operating Mode
Description
Transmit
In Transmit mode the modem is transmitting a signal to the
gateway.
Receive
In Receive mode the modem is attempting or actively listening to
the satellite (listening on the bulletin board channel or on a traffic
channel).
Sleep
This is the time between wake-up intervals. When a terminal is
going to sleep, it stops receiving messages for a wake-up period.
Both the terminal and gateway track the wake-up interval.
Consequently, when a terminal is in Sleep mode it does not miss
messages.
Idle
With IsatData Pro, a modem only receives messages in one of the
10 half second sub-frames. Idle mode is when the modem turns off
its receiver waiting for its next assigned sub-frame. The modem
automatically enters Idle mode on its own, independent of the
application.
1.6.3 GPS
GPS is a modem peripheral that is either on or off.
The GPS device on the modem is powered on. The GPS can be powered on
independently of the IsatData Pro receiver.
1.6.4 Application Peripherals
These peripherals are either on/off. Power consumption is affected when they are
powered on.
Table 3
Application Peripherals
Operating Mode
Description
RS-232 On/Off
When the RS-232 is on the RS-232 transmit driver is enabled and
the serial clocks are active.
LED On/Off
The LED can be enabled by the software.
I/O Active/Inactive
The I/O can be configured as an input or output. Power
consumption consumed by the I/O is defined in section 3.2.2.