MagTek IntelliStripe 60 99875135 - Manual (Page 25)

Appendix A. Options
17
A snap-action switch is operated by the latch mechanism. The signal at the interface I/O
connector is open when the latch is disengaged and is grounded when the latch is engaged.
The latch is controlled by the Latch Control signal. The latch is engaged when the Latch Control
signal transitions from ground to Vcc. The latch is disengaged when the Latch Control signal
transitions from Vcc to ground. It takes about 40ms for the latch to completely engage or
disengage.
POWER-FAIL LATCH RELEASE OPTION, L3
The externally mounted Latch Release Capacitor is shown in Figure A-3.
Note
See Appendix C, Figure C-1, for location of J2 on far side of PCB.
Figure A-3. Latch Release Capacitor
The power fail unlatch option disengages the latch during a power failure. This option is
triggered when Vcc falls below 4.5 volts. An external backup capacitor is required for this
option to function. This capacitor can be connected to the reader through a header on the board.