Keithley / MetraByte PIO-12 Digital I/O Module

The Keithley/MetraByte PIO-12 is a 24-line parallel digital I/O interface board for IBM PC and compatible systems. It has configurable TTL/CMOS-compatible input and output channels via three 8-bit ports, with interrupt capability and flexible address decoding for industrial automation, laboratory research, and educational applications. ## Technical Specifications • Digital I/O Channels: 24 lines across three ports • Port Configuration: Port A and Port B are byte-wide (8 bits each), independently configurable as inputs or outputs. Port C is byte-wide and partitionable into Port C Lower and Port C Upper (4 bits each), each independently configurable as input or output • Logic Levels: TTL/CMOS-compatible with input logic low -0.5V to 0.8V and input logic high 2.0V to 5.0V • Sink Current: 1.7 mA • Source Current: –200 µA • Bus Interface: ISA slot • Address Decoding: 10-bit I/O address decode; uses four consecutive I/O addresses • Interrupt Support: Six interrupt levels available on PC bus with active-low enable line • Power Requirements: ±5V, ±12V from computer supply; +5VDC @ 1.6A typical • Operating Temperature: 0 to 50°C (32 to 122°F) • Storage Temperature: 0 to 70°C (32 to 158°F) • Humidity: 20 to 90% non-condensing ## Key Features • 37-pin D-type connector • CMOS pull-up capability via external 10kΩ resistor to +5V • Compact form factor: 13.2 in L × 4.25 in H × 0.75 in D (335mm × 108mm × 19mm) ## Typical Applications Industrial automation, laboratory instrumentation, real-time device monitoring and control, educational embedded systems development. ## Compatibility & Integration Compatible with IBM PC/XT, PC AT, and compatible computers. Supports DriverLINX software framework with LabVIEW, TestPoint, VisualSCOPE, and ExceLINX drivers. Accessory panels include screw-terminal connectors (STC-37), electromechanical relay boards (ERB-24, ERA-01), and ribbon cable assemblies (C-1800).