The Keithley KPCI-3160 is a PCI-based parallel digital I/O board delivering 96 TTL-level digital I/O lines organized into four 24-bit groups for data acquisition, process control, prototyping, and parallel communications. Each 24-bit group subdivides into three independent 8-bit ports (PA, PB, PC), with the PC port further subdividable into two 4-bit half ports. All ports configure independently as inputs or outputs via software control and default to input mode on power-up or reset.
The board’s high-current driver outputs sink 64 mA and source 15 mA, enabling direct control of relays, LEDs, and solid-state I/O modules without additional interface circuitry. PA, PB, and PC ports remain readable and writable at all times without affecting external signal levels. External interrupt capability on pins 24 and 25 supports external clocking and latching of digital I/O data.
## Technical Specifications
**Digital I/O Architecture**
• 96 TTL-level digital I/O lines total
• Four 24-bit groups, each containing three 8-bit ports (PA, PB, PC)
• PC port subdivides into two independent 4-bit half ports
• Software-configurable input/output per port
• Default input mode on power-up and reset
• Read/write access independent of external signal levels
**Current Drive**
• Sink current: 64 mA
• Source current: 15 mA
**Interrupt & Clocking**
• External interrupts on pins 24 and 25
• External clocking and data latching support
**Interface & Power**
• 100-pin connector
• +5 V from host computer (do not connect external +5 V)
• PCI bus interface
## Key Features
• Direct relay, LED, and solid-state I/O module control without external interface circuitry
• Independent port configuration under software control
• Simultaneous hardware and software access to all digital I/O lines
• Installation Category I and Category II signal compatibility (IEC 60664)
## Typical Applications
• Factory automation
• Switch and contact status monitoring
• Process control systems
• Digital signal switching and routing
## Compatibility & Integration
The KPCI-3160 supports industry-standard solid-state relay accessories including SSIO-24 and PB-24SM modules. Compatible connectors and cable assemblies include CONN-3160-D1, CACC-2000, STA-50, and STP-50. Not supported in Microsoft Windows 7 64-bit environments.
