TTL LEVEL CONVERTER CIRCUIT AND INPUT MODE SELECTION JUMPERS
TTL4/DI3, configured as TTL I/O, can be used as the DATA1 line of the second Wiegand
interface, in combination with TTL3, or any other generic TTL I/O function.
The TTL2-TTL4 front-end circuits have 4.7kOhm pull-up resistors.
When these pins are configured as generic digital inputs, they are protected by a resistor
network, and pulled to ground when not connected. They accept positive voltage levels up
to 40Vdc.
The DI1-DI3 front-end circuits have 2.2kOhm pull-down resistors.
Never apply voltage levels outside the specified operating limits to DI1, DI2 or DI3.
INPUT MODE SELECTION JUMPERS POSITION
WARNING
17
User Guide
