Table Of Contents

USB-6218 BNC Pinout

Version:
    Last Modified: September 18, 2017

    Table 1. Default Counter/Timer Terminals
    Counter/Timer Signal Default PFI Terminal
    CTR 0 SRC PFI 0
    CTR 0 GATE PFI 1
    CTR 0 AUX PFI 9
    CTR 0 OUT PFI 4
    CTR 0 A PFI 0
    CTR 0 Z PFI 1
    CTR 0 B PFI 9
    CTR 1 SRC PFI 3
    CTR 1 GATE PFI 2
    CTR 1 AUX PFI 10
    CTR 1 OUT PFI 5
    CTR 1 A PFI 3
    CTR 1 Z PFI 2
    CTR 1 B PFI 10
    FREQ OUT PFI 6
    Table 2. Signal Descriptions
    Signal Reference Description

    AI GND

    Analog Input Ground—These terminals are the reference point for single-ended AI measurements in RSE mode and the bias current return point for DIFF measurements. All ground references—AI GND, AO GND, and D GND—are connected on the device.

    AI <0..7>, AI <16..23>

    Varies

    Analog Input Channels—For differential measurements, the BNC pin and shield are the positive and negative inputs of the differential analog input channel. Refer to the NI USB-621x User Manual for information about the FS/GS switch selection and single-ended measurement options.

    AI SENSE

    Analog Input Sense—In NRSE mode, the reference for each AI <0..31> signal is AI SENSE.

    AO <0,1>

    Analog Output Channels—These terminals supply voltage output.

    AO GND

    Analog Output GroundAO GND is the reference for AO. All ground references—AI GND, AO GND, and D GND—are connected on the device.

    D GND

    Digital GroundD GND supplies the reference for port 0, port 1 digital channels, PFI, and +5 V. All ground references—AI GND, AO GND, and D GND—are connected on the device.

    +5 V

    D GND

    +5 V Power Source—These terminals provide a +5 V power source or can be used to externally power the digital outputs.

    P0.<0..7> (IN)

    D GND

    Programmable Function Interface or Static Digital Input ChannelsEach PFI terminal can be used to supply an external source for AI, AO, or counter/timer inputs. You also can use these terminals as static digital input lines.

    P1.<0..7> (OUT)

    D GND

    Programmable Function Interface or Static Digital Output ChannelsYou can route many different internal AI, AO, or counter/timer outputs to each PFI terminal. You also can use these terminals as static digital output lines.

    USER

    User-Defined Channel—The USER BNC connector allows you to use a BNC connector for a digital or timing I/O signal of your choice. The USER BNC connector is internally routed to the USER screw terminal.

    Table 3. LED State/Device Status
    POWER/ACT Device Status
    Off Device is not powered or device error. Refer to ni.com/support if device is powered.
    On Device error. Refer to ni.com/support.
    Single-blink Device operating normally. Device connected to USB Hi-Speed port.
    Double-blink Device connected to USB Full-Speed port. Device performance might be affected.

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