The Keysight U2651A is a USB modular isolated digital input/output device that delivers 32 isolated digital input channels and 32 isolated digital output channels—64 opto-isolated digital lines total. It connects via USB 2.0 with USBTMC-USB488 standard support and operates standalone or within a modular chassis system. The device provides 1250 Vrms transient isolation protection, handles input voltages from 10 to 24 V, and supports output voltages up to 35 V maximum. An on-board isolated +5 V supply simplifies testing and integration. Windows-compatible with SCPI and IVI-COM command support, the U2651A integrates with Keysight VEE, MATLAB, LabVIEW, and Visual Studio environments. Bundled Keysight Measurement Manager software and BenchVue enablement streamline setup and data logging.
Technical Specifications
• Digital channels: 32 input, 32 output (64 opto-isolated lines total)
• USB interface: USB 2.0 (480 Mbps)
• Isolation: 1250 Vrms transient protection
• Input voltage range: 10 to 24 V DC
• Output voltage: up to 35 V maximum
• External supply voltage: 5 to 35 V (for external loads)
• On-board isolated supply: +5 V
• Power consumption: +12 VDC, 260 mA maximum
• Connector: 100-pin SCSI-II
• Dimensions: 120 × 182.40 × 44 mm (with casing); 105 × 174.54 × 25 mm (without casing)
• Weight: 565 g (with casing)
• Operating temperature: 0 to +55 °C
• Storage temperature: –20 to 70 °C
– Key Features
• Virtual Port grouping: Assign any eight input/output bits to a single virtual port for simultaneous operations
• Interrupt function: Automatic triggering on digital state change
• Command logger: Captures configuration commands and exports as code snippets
• SCPI and IVI-COM support for standardized instrument control
• Standalone or modular chassis deployment options
– Typical Applications
• Industrial control and process monitoring
• Data acquisition systems requiring galvanic isolation
• Digital signal routing and switching
• Real-time event capture and triggering
– Compatibility & Integration
Supported development environments: Keysight VEE, MATLAB R2007a, NI LabVIEW, Microsoft Visual Studio, Visual Studio .NET, C/C++, and Visual Basic 6. Compliant with CE marking, WEEE Directive (2002/96/EC), IEC 61326-1:2002, and tested to IEC/EN 60068-2 (Shock and Vibration).
