LED Behavior
- Updated2025-02-04
- 2 minute(s) read
LED Behavior
Refer to the following tables to understand the meaning of different LED behaviors on your CAN or LIN 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 |
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 |
Note LED behavior for the NI-9860 can be observed
on the transceiver cables.
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 |
Note LED behavior for the NI-9860 can be observed
on the transceiver cables.
Condition/State | LED 1 | LED 2 |
---|---|---|
Hardware is communicating | Solid green | Activity green (returns to idle/off one second after last TX or RX) |
Condition/State | Ready LED |
---|---|
Connected to a port supporting at least USB High Speed operation (USB 2.0+) and usable. |
Solid red |
Unusable | Off |
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 red |
Hardware is running and controller transitioned to bus off | Solid red |
Condition/State | Ready LED |
---|---|
Port identification | Blinks green |
Catastrophic error | Blinks red |
No open session on hardware | Off |
Open session on hardware port is properly powered, and hardware is not communicating | Solid green |
Open session on hardware, port is missing power from bus | Solid red |
Hardware is communicating | Activity green |