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Keyboard GPS Video Overlay Units
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| The GPSKBD units are designed to meet the needs of those who require a flexible text interface combined with a
GPS video text overlay. Four lines of GPS data can be displayed as shown below. The data position on each line
is fixed, but each line can be moved to any line location on the screen or hidden dependent on the user requirement.
In addition four lines of text can be edited from a PS/2 keyboard and positioned as a block on the screen. Three
versions of the unit are available. GPSKBD-I-5HZ has an internal GPS receiver with an integrated antenna. GPSKBD-E-5HZ
has an internal GPS receiver and an external antenna. Both units have a 5Hz update rate. The GPSKBD is designed
to be compatible with any GPS receiver which sends data using the NMEA 0183 standard. It is supplied with a cable
and gender changer to allow it to be interfaced with a GPS receiver's PC cable. |
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| The GPSKBD unit can be used with any GPS receiver with NMEA 0183 RS232 serial output. 4800 baud 8N1. |
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The GPS data can be displayed in four default configurations as shown below.
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| The speed over ground display can be switched between knots, kilometres per hour or miles per hour. The character
background can be toggled on and off. The altititude display can be shown in feet or metres. The date can be shown
in either the standard DD/MM/YY format or the North American MM/DD/YY format. The time is displayed according to
a user selected +/- 12 hour timezone offset from the GPS UTC time. The character size cannot be changed by the
user, although some customisation of the character set is possible. Please contact us before you make your order
for details of customisation. The gps data display configuration cannot be changed. |
| The table below summarises the data types and user selectable options displayed by the unit, with the NMEA data
sentence each is derived from. If you are unfamiliar with the serial output of the GPS receiver you intend to use
with the GPSKBD unit you should connect it to a PC and use hyperterminal to check that the GPRMC,
GPRMC and GPVTG data sentences are transmitted. If they are not refer to the documentation
from your receiver's manufacturer for the method required to enable NMEA output. |
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Data sentence |
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Latitude |
$GPRMC |
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Longitude |
$GPRMC |
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Time ( User selected timezone offset ) |
$GPRMC |
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Date ( DD/MM/YY or MM/DD/YY format ) |
$GPRMC |
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Heading ( Track made good, degrees true ) |
$GPRMC |
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Speed over ground ( in knots, kph or mph* ) |
$GPRMC, $GPVTG |
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Altitude ( in metres or feet* above / below mean-sea-level (geoid) ) |
$GPGGA |
| *Calculated by the unit. Accurate to +/- 1. |
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| The GPSKBD units are housed in an ABS plastic enclosure with phono connectors for video in / out and a 2.1mm DC
power socket. They are designed to be powered from the same power supply as the camera and so the units do not
have a power switch. Keyboard connection is via a 6-pin mini DIN socket for a PS/2 keyboard. A keyboards is not
included. Order the FLEXKYBD item for use with these units. These units
will not work with USB only keyboards which require PC operating system support. They will only work with
standard PS/2 keyboards and USB keyboards which implement PS/2 functionality. The latter can be connected via a
USB to PS/2 adapter. Flexible keyboards similar to the one shown above are compatible if they have PS/2 functionality. |
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| Suitability |
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| The GPSKBD units is suitable for a wide range of visual survey tasks. However it should be understood that the
standard unit will not always provide a continuously stationary display when the unit is stationary. Even when
a GPS receiver is stationary each calculated position can be different from the last due to the sources of error in the GPS system. These errors will give the appearance of random motion
of the GPS receiver even when stationary or occasional jumps in position when stopped, particularly among high
buildings which can produce multipath errors. |
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| GPSKBD |
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Four lines of 26 characters, font and character size fixed |
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UK English or US / International English keyboard mapping available* |
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Compatible with colour and mono composite video signals. 1Vp-p. PAL or NTSC |
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Dimensions 110 x 65 x 28mm LxWxH |
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Power supply required 9 - 12V DC |
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Power consumption 50mA (without keyboard) |
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Operating Temp. 0° - 85°C |
| *All units are shipped with US / International English keyboard mapping unless ordered from the UK. |
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| GPSKBD-E-5HZ |
GPS Receiver with external Antenna* |
| GPSKBD-I-5HZ |
GPS Receiver with integrated Antenna** |
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High performance MTK-3301 GPS chipset 32 parallel channel all-in-view tracking |
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Very high sensitivity (Tracking Sensitivity: -158 dBm) |
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Rapid Time To First Fix at low signal level, Cold start average 41 seconds, Hot start average 1 second |
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WAAS & ENGOS supported |
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Position Accuracy 10 meters 2D RMS, 5 meters 2D RMS WAAS enabled |
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Datum WGS-84 |
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© The BlackBoxCameraTM Company Limited 2009
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