1st Generation
Each CAN / CAN FD interface on the 1st generation products has 2 status LEDs:
- Blue LED: receive indicator, quick blink on data reception or received error frames
- Red LED: transmit indicator, quick blink during data transmission
LED Summary Table
Steady On
| LED Pattern | Meaning |
|---|---|
Red steady on | Driver recognized, CAN closed |
Blue steady on | Driver recognized, CAN open |
Slow Blink
| LED Pattern | Meaning |
|---|---|
Red and blue slow blink together | Driver not recognized |
Quick Blink
| LED Pattern | Meaning |
|---|---|
Red quick blink | Data transmission |
Blue quick blink | Data reception or received error frame |
Notes
- On 1st generation products, the blue LED indicates both reception and received error frames, so software logs are recommended when you need to distinguish the exact event.
- If the red and blue LEDs slow blink together while idle, check driver recognition first.