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    Table 1. NI 5791 AUX I/O Connector Pin Assignments
    AUX I/O Connector Pin Signal Signal Description
    1 DIO Port 0 (0) Bidirectional single-ended (SE) digital I/O (DIO) data channel.
    2 GND Ground reference for signals.
    3 DIO Port 0 (1) Bidirectional SE DIO data channel.
    4 DIO Port 0 (2) Bidirectional SE DIO data channel.
    5 GND Ground reference for signals.
    6 DIO Port 0 (3) Bidirectional SE DIO data channel.
    7 DIO Port 1 (0) Bidirectional SE DIO data channel.
    8 GND Ground reference for signals.
    9 DIO Port 1 (1) Bidirectional SE DIO data channel.
    10 DIO Port 1 (2) Bidirectional SE DIO data channel.
    11 GND Ground reference for signals.
    12 DIO Port 1 (3) Bidirectional SE DIO data channel.
    13 PFI 0 Bidirectional SE DIO data channel.
    14 NC No connect.
    15 PFI 1 Bidirectional SE DIO data channel.
    16 PFI 2 Bidirectional SE DIO data channel.
    17 GND Ground reference for signals.
    18 +5 V +5 V power (10 mA maximum).
    19 PFI 3 Bidirectional SE DIO data channel.
    Caution  

    The AUX I/O connector accepts a standard, third-party HDMI cable, but the AUX I/O port is not an HDMI interface. Do not connect the AUX I/O port on the NI 5791 to the HDMI port of another device. NI is not liable for any damage resulting from such signal connections.