Data Sheet

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When connecting a clock/data reader, wire the clock line to IO1, and the data line to IO2. Set the
CONTROL line to LOW — this selects the clock/data mode for the Tibbit's hardware.
When connecting a Wiegand reader, wire the W0 line to IO1, W1 line -- to IO2. Set the CONTROL line
to HIGH to select the Wiegand mode.
Most card readers with clock/data and Wiegand interfaces have open collector outputs. Such
outputs require pull-up resistors on the receiving end. On this Tibbit, the role of pull-up resistors is
played by opto-LEDs and resistors connected in series. The original version of this Tibbit required
5V power to be connected to the IO line 3. On the new Tibbit #08 of the revision B, line IO3 is
connected to the internal 5V power (the diagram above shows this modication in red color). This
modication spares you from the necessity to provide external power for pull-ups. You can even
use IO3 line to power your reader (if the reader can run on 5V and your TPS system has enough
spare power). Revision B devices are marked by a small round sticker with letter "B". The sticker is
on the side of the Tibbit.
Tibbit #08 has a standalone open collector output controlled through LINE D. Set LINE D LOW to
open the transistor. When left unconnected, the line defaults to HIGH (hence, the transistor is
closed).
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 reader and your system. Hence, if you use Tibbit #21 you will need to "steal" the
ground somewhere else.
Check out the Tibbit #11 (four open collector outputs) if you are looking to emulate clock/data or
Wiegand reader output (that is, of you want to turn your device into a reader that outputs data).
LEDs
There are four LEDs: two red and two green. Red LEDs are connected to the CONTROL and OC line.
Green LEDs are connected to W0&1 and W1 lines. All LEDs are buered (with logic gates) and light
up for the LOW state of control lines.
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