Data Sheet

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Combine this Tibbit with terminal block devices — #20 (nine terminal blocks) or #21 (four terminal
blocks). Note that #21 doesn't provide the ground line, and using this Tibbit requires the ground
line between the outside world and your system. Hence, if you use Tibbit #21 you will need to
"steal" the ground somewhere else.
One additional possible use of this Tibbit is for the emulation of clock/data or Wiegand card
readers. Our programmable devices (such as TPP2 and TPP3 ) have the unique ability to output data
in the clock/data or Wiegand format. This is achieved through the ser. object running in the
clock/data or Wiegand mode. Card readers usually have open collector outputs so this Tibbit is
ideally suited as the hardware front-end for the job. For this to work, the Tibbit has to be connected
to the TX and RTS lines of the CPU's UART (see [SER] ).
As with many "real" readers, the equipment on the receiving end will need pull-up resistors.
LEDs
There are four red LEDs which are connected to four control lines. All LEDs are buered (using logic
gates) and light up for the LOW state of control lines (i.e. when transistors are in the opened state).
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Tibbit Module