Video Text Overlay Unit with PC keyboard interface, Real Time Clock & On Screen Counter RTCKBD-E Order RTCKBD Order Documentation The RTCKBD units allow a PC keyboard to be used to create text overlays to annotate a video picture. They are designed for general purpose video inspection tasks. For full details of the unit's operation please see the documentation. The RTCKBD-E unit is housed in an ABS plastic enclosure with phono connectors for video in / out and a 2.1mm DC power socket. It is designed to be powered from the same power supply as the camera and so the unit does not have a power switch. Keyboard connection is via a 6-pin mini DIN socket for a PS/2 keyboard. 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, not included, are compatible if they have PS/2 functionality. To use the RTCKBD you will need to make connections for the keyboard, video in, video out and power as described on the RTCKBD overlay board connections page. The RTCKBD-E unit has a 3.5mm jack socket for connecting an external rotary encoder or other circuit to provide the input to the on screen count. A 3.5mm jack plug is supplied with the unit. The counter display increments / decrements by 1 between +9999 and -9999. Please note that the counter is not a direct distance measurement. You will need to know the counts per turn and turns per distance measurement given by the encoder used to read the display. A prescale constant between 1 and 2048 can be set to allow the counter display to be adjusted to match the external count source. The position of the decimal point in the count display can be changed to one of four positions. The direction pin is pulled high internally to give a positive count by default if left unconnected. When used with a incremental rotary encoder connect channel A to counter and channel B to direction as shown below. For details please see the RTCKBD overlay board connections page. Counter Pin 0 - 5V TTL, count on the rising edge Direction Pin 5V TTL logic high for + count, 0V TTL logic low for - count Ground Common Ground Features Eight separate text pages 26 x14 characters PAL, 26 x 11 rows NTSC. Font and character size fixed. 24 hour format Real Time Clock UK English or US International keyboard mapping available. Compatible with colour and mono composite video signals. 1Vp-p. PAL or NTSC RTCKBD-E dimensions 110 x 65 x 28mm LxWxH RTCKBD dimensions 60 x 54 x 20mm LxWxH Power supply required 9 - 12V DC Power consumption 50mA (without keyboard) Operating Temp. 0° - 85°C Home Back Order © The BlackBoxCameraTM Company Limited 2010