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The NI USB-9215 Series device has a green LED next to the USB 
connector. The LED indicator indicates device status, as listed in Table 2. 
When the device is connected to a USB port, the LED blinks steadily to 
indicate that the device is initialized and is receiving power from the 
connection.

If the LED is not blinking, it may mean that the device is not initialized or 
the computer is in standby mode. In order for the device to be recognized, 
the device must be connected to a computer that has NI-DAQmx or 
NI-DAQmx Base installed on it. If your device is not blinking, make sure 
your computer has the latest version of NI-DAQmx or NI-DAQmx Base 
installed on it, and the computer is not in standby mode.

The NI USB-9215 Series provides connections for four differential analog 
input channels. The NI USB-9215A with BNC has four BNC connectors.

A high voltage screw terminal backshell must be installed when using hazardous 

voltages (>42.4 V

pk

, 60 VDC) with the NI USB-9215 Series. 

The NI 9932 10-terminal, detachable, high voltage, screw-terminal backshell 

accessory works with the NI USB-9215 Series and is available from 

ni.com

. For more 

information about installing the backshell, refer to the 

 section.

Table 2.  LED State/Device Status

Not lit

Device not connected or in suspend.

On, not blinking

Device connected, but no module installed.

Single-blink

Operating normally.

Double-blink

NI USB-9215A only—Connected to USB 
Full-Speed port. Device performance might 
be affected. Refer to the 

section for more information.

Quadruple-blink

Device error. Refer to 

ni.com/support

.