2nd Generation
Each CAN channel on 2nd generation CAN products uses one tri-color LED to indicate channel state, communication events, and bus faults.
LED Summary Table
Steady On
| LED Pattern | Meaning |
|---|---|
Yellow steady on | Channel closed |
Cyan steady on | Normal Mode, channel open, TX and RX enabled |
Green steady on | Listen Only Mode, receive only |
Red steady on | Bus-Off, severe bus error, channel unavailable |
Slow Blink
| LED Pattern | Meaning |
|---|---|
RGB slow blink | Driver not recognized or not fully loaded |
Quick Blink
| LED Pattern | Meaning |
|---|---|
Blue quick blink | Transmit success |
Green quick blink | Receive success |
Red quick blink | An error frame appears on the CAN bus[1] |
[1] Detailed error states and error counters can be viewed with kcan_monitor and related software tools.
Combined Quick Blink
| LED Pattern | Meaning |
|---|---|
Green → Blue → Off | The same LED rotates within one 300ms cycle as green 100ms → blue 100ms → off 100ms, indicating RX + TX at the same time |
Green → Blue → Red | The same LED rotates within one 300ms cycle as green 100ms → blue 100ms → red 100ms, indicating RX + TX + ERR at the same time |
Notes
- Quick blink uses a
300mscycle and is used for TX, RX, and error indication. - Combined quick blink uses
TDMtime slots: this is not multiple LEDs lighting in parallel, but the same LED rotating through color slots. - In
Listen Only Mode, the green background and green RX event use the same color, so the RX blink may look less obvious. This is expected behavior.