304
Tibbo Project System (TPS)
© Tibbo Technology Inc.
7.2.9.19
#08, M1S: Wiegand and Clock/Data Reader Port
Function:
Wiegand and clock/data reader port plus one open collector output
Category:
Input/output module
Special needs:
Power requirements:
5V/20mA
Mates with:
See also:
Details
Our programmable devices (such as
and
) have the unique ability to
process input from card readers with clock/data or Wiegand interface. This is
achieved through the ser. object running in the clock/data or Wiegand mode. Tibbit
#08 implements necessary hardware.
In order to be able to process card reader output, this Tibbit has to be connected
to the RX and CTS lines of the CPU's UART (see
).
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