USB LED Descriptions
The USB serial two and four-port hardware uses bicolor LEDs to indicate device and port status. The following table describes these LEDs; the following figure shows their location.
|Ready||Dim Red—Powered, but not connected to USB (USB-485/4 only)|
Red—Powered and connected to USB, but not fully configured
Yellow—Device is ready (normal operation)
Blinking Red or Red-Yellow—Device error. Contact NI.
|Port x||Solid Red—Port is open, but no valid signals detected (USB-232 only)|
Solid Green—Port is open
Blinking Yellow—Port is transmitting
Blinking Green—Port is receiving
Alternated Blinking Green/Yellow—Port is transmitting and receiving
Blinking Red—Port error (framing error, FIFO overrun, or parity error)