V-Data VED-M Operation Manual - Decode Mode
3
Decode Mode
If GPS input is not present on power-up, the VED will enter the decode mode when edge-
coded video is detected. In the decode mode, GPS data is output in RS-232 form (4800 baud, 8
data bits, 1 stop bit, no parity) each time the edge-code changes, which is normally once per
second. If the edge-code is not changing such as when the VCR is paused, the output repeats at
intervals of about 1.5 seconds. If edge-code is absent or unreadable, a "?" is displayed at the top
of the edge code column on each read attempt.
The VED output in decode mode is formatted as a $GPRMC message to simulate the
output of a GPS receiver. The $GPRMC message contains local time determined by the hour
offset rather than UTC time. This avoids a discrepancy between the output data and the time
displayed on the video monitor. Magnetic deviation is not included in the message. A dummy
$GPGSA message is output for compatibility with certain moving map programs, but the
message contains no valid data.
Computer Adapter Cable
This optional "Y" adapter cable allows a computer to monitor live GPS data from the
receiver in encode mode, and playback GPS data in decode mode. Wiring is as follows:
Connector
DB15F
DB15M
DB9F
Connections
4 - - - - - - - - white - - - - - - -
4
5 - - - - - - - - blue - - - - - - - - 5
8 - - - - - - - - green - - - - - - - 8
10 - - - - - - - red - - - - - - - - 10
11 - - - - - - - orange - - - - - - 11
14 - - - - - - - black - - - - - - - 14
15 - - - - - - - brown - - - - - - 15
6 - - - - - - - red - - - - - - - - - 2
7 - - - - - - - green - - - - - - - 3
13 - - - - - - black - - - - - - - 5
S-Video (Y/C) Adapter
This option adapts the BNC video in/out connectors on the VED to 4 pin mini-DIN
connectors for use with S-Video (Y/C) cameras and recorders. Separation of luminance and
chrominance is preserved.
AC Power Adapter
This option is a 9 VDC, 500 milliamp output wall transformer which allows the VED to
be used with 120 VAC, 60Hz power.