Table Of Contents
CAN LED Behavior
Last Modified: May 21, 2018
Refer to the following tables to understand the meaning of different LED behaviors on your CAN module.
Each LED can display two colors (red or green), which display in the following four 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 1. NI 9860/9861/9862 C Series Modules and Transceiver Cables (Two LEDs Per Port)—Protocol Independent
| Condition/State | LED 1 | LED 2 |
|---|---|---|
| Port identification | Blinks green | Blinks green |
| Catastrophic error | Blinks red | Blinks red |
| No open session on hardware | Off | Off |
| Open session on hardware, port is properly powered, and hardware is not communicating | Solid green | Off |
| Open session on hardware, port is missing power | Solid red | Off |
Table 2. NI 9860/9861/9862 C Series Modules and Transceiver Cables (Two LEDs Per Port)—CAN Protocol
| Condition/State | LED 1 | LED 2 |
|---|---|---|
| Hardware is communicating, and controller is in Error Active state | Solid green | Activity green (returns to idle/off one second after last TX or RX) |
| Hardware is communicating, and controller is in Error Passive state | Solid green | Activity red (returns to idle/off one second after last TX or RX) |
| Hardware is running, and controller transitioned to bus off | Solid green | Solid red |
Table 3. 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 amber |
| Unusable | Off |
Table 4. USB Devices (One LED Per Port)—USB CAN HS
| Condition/State | Ready LED |
|---|---|
| Port identification | Blinks green |
| Catastrophic error | Blinks red |
| No open session on hardware | Off |
| Interface is configured, no activity, in error active state | Solid green |
| Open session on hardware, port is missing power from bus | Solid red |
| Hardware is communicating and controller is in Error Active state | Activity green |
| Hardware is communicating and controller is in Error Passive state | Activity amber |
| Hardware is running and controller transitioned to bus off | Solid red |