MagTek IntelliStripe 60 99875135 - Manual (Page 22)

IntelliStripe 60, TTL Insertion Reader
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There are two options for power-fail unlatch, designated L3 and L4. These options differ only in
how the power-fail and motor voltage are applied to the board. 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. For the L3 option,
this capacitor can be connected to the reader through a header on the board. For the L4 option,
the external capacitor is connected to the 26-pin I/O connector and power for the latch motor is
provided through a Schottky diode from Vcc (pin 11).