Product Overview
The National Instruments USB-6259 Mass Termination is a multifunction data acquisition device for USB based systems. It is part of the NI M Series DAQ family and provides 32 analog input channels with 16 bit resolution and a maximum single channel sampling rate of 1.25 MS/s. The device also includes four analog output channels, 48 digital input and output lines, and two counters. The mass termination version uses high density connectors for organized multi channel wiring.
The USB-6259 Mass Termination is designed for high channel count measurement, automated test, laboratory validation, and control applications that need a compact USB interface. The mass termination connector arrangement reduces cabling complexity in systems that use many analog and digital lines, and it supports the use of compatible terminal blocks and accessory hardware.
Analog Input Performance
The device provides 32 analog input channels with 16 bit resolution and a maximum single channel rate of 1.25 MS/s, with the aggregate rate shared across active channels. Selectable input ranges, including plus or minus 10 V, plus or minus 5 V, and plus or minus 1 V, allow the device to match different signal levels and use the available resolution effectively.
Hardware timed acquisition, external sample clocks, and triggering support repeatable measurement sequences. Multichannel scanning can be configured for single ended or differential connections depending on the accessory and wiring. Differential wiring is often preferred for low level signals and for rejecting common mode noise in industrial environments.
Analog Output and Digital I/O
The device includes four 16 bit analog output channels for control voltages, setpoints, and waveform generation. Hardware timed output produces deterministic waveform sequences, which is useful for stimulus response testing, actuator command profiles, and control loop evaluation. Engineers should confirm the load and settling requirements of the driven device.
Forty eight digital lines provide logic level control, relay driving through external conditioning, and status monitoring. Two 32 bit counters support event counting, frequency measurement, pulse generation, and encoder position tracking. Because analog and digital tasks can share timing signals, the device can implement coordinated mixed signal sequences.
Mass Termination Connectivity
The mass termination version provides high density connectors that bring many signals to a single interface. This reduces the number of separate cables in a multi channel system and simplifies connection to terminal blocks and breakout boards. Engineers should use compatible cables and accessories and should confirm pin assignments before wiring.
Mass termination cables must be properly strain relieved, especially in systems where the device is moved or where cables are routed through cabinets. Shielding and separation from power conductors help maintain signal quality in high channel count systems. Engineers should document the pin mapping and cable design for maintainability.
Timing and Synchronization
NI-DAQmx provides start triggers, reference triggers, pause triggers, and sample clock configuration for the USB-6259 Mass Termination. These features allow acquisition and generation to be aligned with external events or with other DAQ devices. Counter outputs can be routed as triggers, and analog or digital events can gate tasks.
For larger systems, multiple devices can be synchronized using shared timing and trigger signals where supported. Engineers should validate sustained USB throughput for the planned channel count and sample rate, because host performance and USB bandwidth affect continuous streaming performance.
Typical Applications
High channel count analog data acquisition
Mixed signal automated test systems
Analog stimulus and waveform generation
Digital control, monitoring, and event counting
Laboratory measurement and prototype validation
Multi channel USB DAQ systems with mass termination wiring
The USB-6259 Mass Termination provides 32 analog inputs at 1.25 MS/s, 4 analog outputs, 48 digital lines, and 2 counters in a USB DAQ device with high density connectors. Its channel count and NI-DAQmx support make it suitable for demanding multi channel test and measurement applications.
