Interpret CAN and LIN module LED colors and patterns to identify port status, communication activity, and error states.

Each LED can display two colors (red or green), which display in the following four patterns:

Table 27. LED Display Patterns
Pattern Meaning
Off No LED illumination
Solid LED fully illuminated
Blink Blinks at a constant rate of several times per second
Activity Blinks in a pseudo-random pattern
Table 28. C Series/PXI Modules and Transceiver Cables (Two LEDs Per Port)—Protocol Independent
Condition/State LED 1 LED 2
Identifying the port. Blinks green Blinks green
Catastrophic error occurred. Blinks red Blinks red
No open session on hardware. Off Off
Open session on hardware. The port is properly powered. The hardware isn't communicating. Solid green Off
Open session on hardware. The port is missing power. Solid red Off
Note Observe the LED behavior for the NI-9860 on the transceiver cables.
Table 29. C Series/PXI Modules and Transceiver Cables (Two LEDs Per Port)—CAN Protocol
Condition/State LED 1 LED 2
Hardware is communicating. The controller is in Error Active state. Solid green Activity green (returns to idle/off one second after last TX or RX)
Hardware is communicating. The controller is in Error Passive state. Solid green Activity red (returns to idle/off one second after last TX or RX)
Hardware is running. The controller transitioned to bus off. Solid green Solid red
Note Observe LED behavior for the NI-9860 on the transceiver cables.
Table 30. C Series/PXI Modules and Transceiver Cables (Two LEDs Per Port)—LIN Protocol
Condition/State LED 1 LED 2
Hardware is communicating. Solid green Activity green (returns to idle/off one second after last TX or RX)
Table 31. USB Devices (One LED Per Port)—USB connection
Condition/State Ready LED
Connected to a port supporting at least USB High Speed operation (USB 2.0+) and usable. Solid red
Not usable. Off
Table 32. USB Devices (One LED Per Port)—USB CAN HS
Condition/State Ready LED
Identifying the port. Blinks green
Catastrophic error occurred. Blinks red
No open session on hardware. Off
Interface is configured. No activity, in error active state. Solid green
Open session on hardware. The port is missing power from bus. Solid red
Hardware is communicating. The controller is in Error Active state. Activity green
Hardware is communicating. The controller is in Error Passive state. Activity red
Hardware is running. The controller transitioned to bus off. Solid red
Table 33. USB Devices (One LED Per Port)—USB LIN
Condition/State Ready LED
Identifying the port. Blinks green
Catastrophic error occurred. Blinks red
No open session on hardware. Off
Open session on hardware. The port is properly powered. Hardware isn't communicating. Solid green
Open session on hardware. The port is missing power from bus. Solid red
Hardware is communicating. Activity green