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On Screen Display Project Board Connections
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This page gives instructions for the connection of our on screen display project boards to power,
video in and video out.
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Power and Video Connections
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The positions for the connection of power, video in and video out are clearly marked on the video overlay board
shown in insert A below right. A 9 - 12V DC regulated power supply should be connected to the points marked +12V
and 0V as shown in inserts B and C, close up, below right. Care should obviously be taken in connecting the power
supply. Although the designated power connection points are protected against accidental reverse polarity connection,
connecting the power elsewhere on the board will result in its failure. Our warranty specifically excludes failure
due to improper connections. Please ensure that all soldering or other connection work is done in accordance with
these instructions.
The video connections shown in this example are made with screened coaxial cable suitable for video signals. The
lapped screen which carries the video ground from the camera is connected to the video ground on the board. Care
should be taken to ensure that the video grounds and power ground are connected separately. |
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5V Power Connections
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| The 9 - 12V DC regulated power supply is reduced to 5V DC by the 500mA switch mode regulator on the video overlay
board. This 5V output is available to power a user designed circuit. The connection point for the 5V output is
shown in the highlighted insert below left, marked 5V. WARNING: There is no
polarity protection on the 5V output. Short circuiting this point on the board to ground, either directly or via
the attached circuit, will damage or destroy the video overlay circuit. The warranty is void in such cases. The
board may also be powered from an external circuit with a 5V power supply connected to this point. |
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Serial Connections
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| The video overlay board provides clearly marked RS232 connection points highlighted in the insert below left. These
are shown connected bottom left. The TX (transmit) and RX (receive) refer to the overlay board signals. Connections
from these points should be made to equipment with an RS232 interface such as a PC, PDA or GPS receiver. The PC
or other serial TX line, shown as red below, should be connected to the overlay board at the point marked RX. The
PC or other serial RX line, shown as yellow below, should be connected to the overlay board at the point marked
TX. The serial ground should be connected at the point marked GND. If the wires from the board are terminated with
a male or female DB9 connector this should be connected as shown below. |
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Serial Connection Points
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| DB9 cable signals |
| Signal |
Male Pin No. |
Female Socket No. |
| RS232 TX |
Pin 3 |
Socket 2 |
| RS232 RX |
Pin 2 |
Socket 3 |
| GND |
Pin 5 |
Socket 5 |
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RS232 Serial Connections
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TTL Serial Connections
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| The 5V TTL serial connection points are highlighted in the insert top left. These points should be used to connect
either a microcontroller or other serial interface to the board. The point marked RB1 is the board TTL RX. This
is the point that should be connected to the microcontroller data out TX line, shown in red above right. The point
marked RB2 is the board TTL TX. This should be connected to the microcontroller data in RX line, shown in yellow
above right. The ground connection should made to the point marked GND. |
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© The BlackBoxCameraTM Company Limited 2009
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