✅ Core Specifications (Official Simplified Version)

?? Interfaces

Device side: 68-pin female SCSI (for NI-660x counter card, such as 6601/6602/6608/PXI-6612, etc.)

BNC total: 14 channels BNC (50Ω, shielded)

8 channels dedicated BNC: PFI0 to PFI7 (programmable function interface, bidirectional)

6 user-defined BNC: can be mapped to internal signals

Spring terminals: 30-pin spring terminals (covering all I/O, +5V, GND, encoder/trigger signals)

?? Built-in Functions (Key Different from 2110)

TTL function generator: can output adjustable square waves/pulse trains, used for testing counter trigger

Orthogonal encoder simulation: 2 channels of terminals can simulate A/B phase pulses (24 pulses/rotation)

Low-pass filter: built-in, smooths trigger output, reduces spikes

Status LED: each digital I/O is equipped with an LED, intuitively displays level status

?? Mechanical / Environmental

Shell: fully metal shield (anti EMI)

Size: 19.05 × 10.48 × 3.51 cm (same as 2110)

Temperature: 0 ~ 55°C (operating)

Installation: desktop installation (standard accessories)

?? Usage and Positioning

One-sentence positioning: BNC-2121 is a dedicated BNC front end + signal source simulator for NI-660x counter card, used for frequency / period / encoder / trigger testing, not for analog quantity acquisition (that is 2110).

Typical scenarios:

Quick wiring of BNC for counter/timer card (660x)

No need for external signal source: directly use built-in square waves/encoder signals to test 660x card

Frequency, pulse width, event counting, orthogonal encoder measurement

Trigger signal conditioning and monitoring