2nd Generation
Second-generation CAN products use an independent SYS indicator for system status and one tri-color indicator for each CAN channel.
SYS Indicator
| Indicator Pattern | Meaning |
|---|---|
| Steady on | Normal operation |
| Slow blink | Boot mode |
| Quick blink | Upgrade in progress |
CAN Channel Indicators
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 |
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.