Table Of Contents

USB-232/4 Pinout

    Last Modified: March 20, 2017

    Table 1. Signal Descriptions
    Signal Description
    DCD Data Carrier Detect.
    RXD Received Data.
    TXD Transmitted Data.
    DTR Data Terminal Ready.
    GND Ground.
    DSR Data Set Ready.
    RTS Request To Send.
    CTS Clear To Send.
    RI Ring Indicator.
    Table 2. LED State/Device Status
    LED LED Color LED State Device Status
    READY Red Dimly lit Powered, but not connected to USB (self-powered USB only).
    Lit Powered and connected to USB, but not fully configured.
    Yellow Lit Device is ready (normal operation).
    Red or Red/Yellow Blinking Device error. Contact NI.
    PORT x Red Lit Port is open, but no valid signals detected.
    Blinking Port error (framing error, FIFO overrun, or parity error).
    Green Lit Port is open.
    Blinking Port is receiving.
    Yellow Blinking Port is transmitting.
    Green/Yellow Blinking Port is transmitting and receiving.

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