The Keysight U2651A is a USB modular isolated digital I/O device that delivers 32 opto-isolated input channels and 32 opto-isolated output channels—64 total digital lines—for data acquisition and control in industrial automation, test, and laboratory environments. Built-in 1250 Vrms transient voltage protection between I/O lines shields equipment and personnel from ground loops and high-voltage transients. The device connects to a host PC via Hi-Speed USB 2.0 (480 Mbps) and supports USBTMC-USB488 protocol. An on-board isolated +5 V supply enables quick prototyping without external power sources.
Technical Specifications
Digital I/O Architecture
• 32 isolated digital input channels
• 32 isolated digital output channels
• Input voltage range: 10 to 24 V
• Output voltage (external load): up to 35 V maximum
• External supply voltage: 5 to 35 V
• Opto-isolation with 1250 Vrms transient protection between I/O lines
Connectivity & Interface
• Hi-Speed USB 2.0 (480 Mbps) host interface
• USBTMC-USB488 standards compliance
• On-board isolated +5 V power supply
Physical & Environmental
• Dimensions: 44 mm (H) × 120 mm (W) × 182.4 mm (L)
• Weight: approximately 565 g
• Operating temperature: 0°C to +55°C
– Key Features
• Interrupt-driven architecture automatically triggers on digital state change, reducing PC overhead
• Virtual port grouping functionality for flexible channel organization
• Standalone or modular system integration
• Optional U2903A or U2904A terminal blocks for streamlined connections
– Typical Applications
Industrial automation, supervisory control and data acquisition (SCADA), equipment protection in high-voltage environments, ground isolation testing, and laboratory digital signal routing.
– Compatibility & Integration
Supports Keysight VEE, MATLAB R2007a, NI LabVIEW, and Microsoft Visual Studio environments. Programming available in Visual Basic, C++, and C#. SCPI and IVI-COM protocols supported. BenchVue-enabled for instrument control and test automation. Keysight Measurement Manager (AMM) software included for configuration and data logging; command logger captures setup commands for VEE code generation. Requires Microsoft Windows operating system.
