Tresco Radar Overlay - Operator’s manual
Page 21
Interface Descriptions
Interface from Radar to PC
The radar is the main navigation instrument that controls the quality of the radar
picture. The PC follows these settings and uses the radar video in slave mode. So,
when the range or the off-center position on the radar is changed, the Radar
Overlay changes accordingly.
Radar echo video signal interface
The radar echo video signal is captured at the end of the processing stages from
the main radar. This has the unique advantage that the Tresco Radar Overlay has
the same high-quality echo image as the main radar. The communication to the
RIB in the Tresco-PC is done by a VGA- or DVI-cable.
Radar parameters interface
The radar parameters such as Sea, rain, gain, tune, range, off-center and color-
scheme are directly interpreted from the video signal. So, no extra physical
interface is required to obtain this data.
Ship’s heading marker(SHM) or “Bearing Zero” interface
This signal indicates when the radar antenna is updating bow echoes at 0 degrees
head-up. This electrical pulse is fed to the Data-Set-Ready contact of a RS-232
port on the PC. If necessary, a serial port already used for NMEA data, can be
shared to also input this signal.
Although not absolutely necessary, this interface allows the Tresco chart drawing
engine to synchronize with the scanner.
Interface from PC to Radar
The standalone radar is not controlled by this product in anyway. It is the PC that
works in slave mode and adapts to the settings controlled by the radar console.
