NI BNC-2121 Connector Accessory for 660X Devices

The BNC-2121 is a terminal block accessory that expands signal connectivity for NI 660X counter/timer devices. It provides simultaneous access to all I/O signals via eight dedicated BNC connectors, six user-defined BNC connectors, and spring terminals for PFI (Programmable Function Interface) lines. The accessory connects via a 68-position cable and enables pulse-train generation, trigger signal conditioning, quadrature encoder signal processing at 24 pulses per encoder revolution, and TTL-compatible function generation. An integrated low-pass filter minimizes glitches in trigger outputs. Desktop-mountable with status indicators for power and all digital I/O channels, the BNC-2121 simplifies signal routing in laboratory and test environments while maintaining signal integrity across multiple signal types.

– Technical Specifications

• Eight dedicated BNC connectors
• Six user-defined BNC connectors
• Six user-defined bidirectional spring terminals
• Two spring terminals for quadrature encoder signals
• Spring terminals for PFI lines (bidirectional)
• Quadrature encoder capability: 24 pulses per revolution
• Function generator output: TTL-compatible square waves
• Low-pass filter for trigger signal conditioning
• Power status LED and individual LED indicators for each digital I/O channel
• Dimensions: 26.7 × 11.2 × 5.5 cm (10.69 × 4.41 × 2.05 in.)
• Desktop mount configuration
• Connection: 68-position cable (e.g., SH68-68 or R6868)

– Key Features

• Pulse-train signal generation from counter outputs
• Trigger signal support with integrated filtering to reduce glitches
• Quadrature encoder input/output with defined pulse rate
• Function generator for test signal development
• Full visibility of device status through LED indicators
• Spring terminal and BNC connector combination for flexible signal routing

– Typical Applications

• Counter/timer function validation and characterization
• Pulse train measurement and generation
• Encoder signal simulation and acquisition
• Trigger signal conditioning in test systems
• Multi-signal laboratory test configurations

– Compatibility & Integration

Designed exclusively for NI 660X counter/timer devices, including PCI-6601 and PCI-6602 models. Requires appropriate 68-position cable for device connection.