Command - Furuno Felcom 250 Service Manual

2. Command

The commands used for the satellite acquiring sequence which is sent from the
Communication unit to the Antenna unit are as follows;
ATB_FREQ_ELEVATION
Specify the Channel and the elevation angle by the command for shifting to
SEEK_ELEVATION_ST, and execute searching by the specified Channel and
elevation angle.
ATB_FREQ_UPDATE
Specify the Channel by the command for shifting to SEEK1_ST. Unlike the
ATB_FREQ_ELEVATION command, it will start searches for all points. The
searching elevation angles are 15, 45, and 75 degrees.
TU_SIGNAL_STAT
A command for notifying whether sufficient signals are gained from the satellite,
and is effective when the system is set to tracking status.
TU_SIGNAL_STAT = 1: When the Communication unit identifies the
signal acquired during tracking status as unwanted signal, it will send this
command. After this command is sent, the antenna STATUS will change to
SEEK2_ST. However, when the threshold for SEEK2_ST is low when the
signal is detected, the status will change to SEEK_ELEVATION_ST.
ATB_STATUS_REQ
It requests for the STATUS of the Antenna unit at an interval of 1 second.
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11.2 Antenna Unit: FB-1500/1250