Wiegand Timing; Magstripe Timing - Nedap uPASS REACH Installation Manual

UPASS REACH | INSTALLATION GUIDE
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3.4.2 WIEGAND TIMING

In the figure below the Wiegand protocol timing is specified.
Tpw
5V
DATA-1
0V
5V
DATA-0
0V
Timing constants:
Tpi Pulse interval time
Tpw Pulse width time
Figure 12: Wiegand protocol timing

3.4.3 MAGSTRIPE TIMING

In the figure below the timing for one magstripe character is specified. Each bit
consists out of one period low (220µsec) and two periods high (440µsec). The bit
times have an accuracy of 10 percent. The data-signal RDP is valid and stable on the
falling edge of the clock-signal RCP.
660µsec
5V
RCP
0V
5V
RDP
0V
l s b
0 1
Timing constants:
Clock period 660µsec
Clock high 440µsec
Clock low 220µsec
Data preamble 11msec
Data postamble 11msec
Figure 13: Magstripe protocol timing one character
The CLS card loaded signal will be active (=low) during the complete transmission.
Before and after the data 16 clock pulses are generated (postamble and preamble).
The number of data characters is determined by the tag.
Below is an example of a complete magstripe event.
Tpw
Tpi Tpi
1msec
50µsec
3300µsec
220µsec
m s b odd par i t y
1 0 1
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