Addi-Data ADDICOM PA 7400 Series Technical Description page 17

PA 7400
Parallel port
Compatibility: ................................................. TTL- compatible
Input at logic "0": ............................................ max 0.8 V
Input at logic "1": ............................................ min 2.2 V
Output at logic "0": ......................................... max 0.4 V / 6 mA
Output at logic "1": ......................................... min 2.4 V / 6 mA
Addressing: ..................................................... LPT1-3
Interrupt lines: ................................................. IRQ5, IRQ7
Safety:
Optical isolation: ............................................. 1000 V
Overvoltage protection: .................................. through transil diodes
Voltage reversal protection: ............................ through transil diodes
Protection against short-circuit: ....................... for RS422/RS485 through PTC
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Technical description Chapter 4