OSD-232+ Evaluation Board

OSD-232+ Evaluation Board

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The EB-OSD-232+™ evaluation board accelerates the evaluation of the OSD-232+ on-screen composite video character and graphic overlay module.  The EB-OSD-232+™ includes an on-board 28 pin DIP socket, 5 volt regulator, DC power jack, power switch, power status LED, dip switches, female DB-9 RS-232 serial jack, and for future enhancements momentary push buttons and I2C eeprom socket.

The EB-OSD-232+™ evaluation board also includes a Windows PC based demonstration utility for the OSD-232+™, 6’ PC RS-232 serial cable, and wall power supply.



  • Dimensions: 3.00" L x 3.94” W x .7" H
  • Weight: 2.1 oz. (with OSD-232+™ module installed)
  • Input voltage: 7.0 to 14.0 volts DC (200 ma max)
  • DC connector: 2.1 mm x 5.5 mm, center tip positive
  • Video connectors: RCA
  • RS-232 connector: Female DB-9
    • Pin 2 - OSD-232+™ serial out
    • Pin 3 - OSD-232+™ serial in
    • Pin 5 - Ground
  • RS-232 serial or TTL input: 9,600 or 19,200 baud, 8 data bits, 1 stop bit, inverted data
  • Operating temperature: -40C to +85C (extended temperature range standard)


OSD-232+™ Installation

It is very important the OSD-232+™ module is inserted into the 28 pin DIP socket of the EB-OSD-232+™ board in the proper orientation.  Pin 1 of the OSD-232+™ module is near the white square on the top left corner of the board.  Pin 1 of the EB-OSD-232+™ 28 pin DIP socket is indicated with a notch on the top of the socket.

Dip Switches:

DIP switch inputs are only checked during power-up.

DIP # Description
1 RS-232 baud rate
           OFF   = 9,600 baud
           ON    = 19,200 baud
2 NTSC or PAL video format
           OFF   = NTSC
           ON    = PAL
3 Display font screen
           OFF   = Do nothing
           ON    = Display font screen        
4 Firmware flash update
           OFF   = Do nothing
           ON    = Enter OSD-232+™ firmware flash update



All OSD-232+™ jumper pins are TTL levels (0 and +5 VDC)

Jumper: JP5
Pin # OSD-232+™ Input / Output Label Description
1 Output CTS RS-232 clear to send (future enhancement)
2 N/A GND RS-232 ground
3 Input RTS RS-232 request to send (future enhancement)


Jumper: JP6
Reserved (pins 1 - 6)


Jumper: JP7
Pin # OSD-232+™ Input / Output Label Description
1 Input + Output GPIO 0 General purpose I/O (future enhancement)
2 Input + Output GPIO 1 General purpose I/O (future enhancement)
3 N/A GND Ground
4 Output VSYNC Vertical sync output of video input
            Low = video vertical sync interval
            High = not video vertical sync interval
5 Output HSYNC Horizontal sync output of video input
            Low = video horizontal sync interval
            High = not video horizontal sync interval
6 Output LOS Loss of sync of video input
            Low = video present on input
            High = no video present on input




Trouble Shooting Tips:

Problem Solution
Green LED off (unit won’t power up)
  • Verify power supply output is 7.0 to 14.0 volts DC when attached
  • Verify the 250ma internal fuse is good
Garbage characters on screen or text not displayed
  • Verify using correct RS-232 com port on PC
  • Verify communication baud rate 9,600 or 19,200
  • Enable DIP 3 to generate the font test screen
  • Use the supplied PC demonstration utility to verify the unit is working properly


Warranty & Service:

If the product fails to perform as described in our product description or specification, within 1 year from the date of shipment to the buyer, we will repair or replace the product and/or accessories originally supplied. Failure due to improper installation, misuse, abuse or accident is not covered by this warranty. Incidental and consequential damages are not covered by this warranty. The buyer must first obtain a Return Material Authorization number by calling (248) 588-4400, or send email to support@icircuits.com. Ship the defective product (with RMA number) to Intuitive Circuits, 3928 Wardlow Ct., Troy, MI 48083, freight prepaid.