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© National Instruments Corporation 9 NI USB-9229/9239 User Guide and Specifications
LED Indicator
The NI USB-9229/9239 device has a green LED next to the USB
connector. The LED indicator indicates device status, as listed in Table 1.
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 installed
on it. If your device is not blinking, make sure your computer has the latest
version of NI-DAQmx installed on it, and the computer is not in standby
mode.
Wiring the NI USB-9229/9239
Note Table 2 illustrates the accessories available from ni.com for use with the
NI USB-9229/9239.
The NI USB-9229/9239 has four 2-terminal detachable screw-terminal
connectors that provide connections for four simultaneously sampled,
isolated analog input channels. Connect the positive signal of the signal
source to the AI+ terminal, and connect the negative signal of the signal
Table 1. LED State/Device Status
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 Connected to USB Full-Speed port. Device
performance might be affected. Refer to the
Specifications section for more information.
Quadruple-blink Device error. Refer to ni.com/support.
Table 2. Accessories
Accessory Accessory Description
NI 9971 Strain relief and high-voltage backshell
NI 9976 2-position screw-terminal plug