CANdle U
ser’s Guide
www.ctr-electronics.com 1/17/2022
Cross The Road Electronics Page 8 1/17/2022
1.7. LED States
The CANdle features a
tri-color LED
that indicates CAN bus health and general status (similar to other CTR-
Electronics CAN devices). This feature can be used to confirm proper CAN bus and power wiring. The table below
shows the possible color patterns and their respective CANdle states.
LED Color
5V out / V+ out
Description
Off
Disabled
CANdle is not powered/ plugged in.
Check power cabling to the CANdle.
Also confirm software configuration has not disabled LED
explicitly.
(Note 1)
Yellow
/
Green
(LED is never off)
Disabled
Device is in bootloader, most likely because field-upgrade failed
in middle of event.
Inspect CAN bus wiring and re-field-upgrade using Phoenix Tuner.
If device has valid firmware, turn device off, wait 10 seconds, and
turn device on to boot strap it.
In this state, the 5V and V+ outputs are off to prevent accidental
shorting.
Red
/
Yellow
(LED is never off)
Disabled
(
…
if firmware determines
this is required)
Hardware is damaged.
Slow Red Blink
Configurable/On
(Note 2)
Check CAN Bus health and connection to the CANdle/Pixel pulse
train connection to the CANdle.
In this state, the output of the CANdle is determined by
configuration.
Rapid Red Blink
Off
Device has faulted and has disabled outputs to prevent hardware
damage.
Check Phoenix Tuner self-test to diagnose what fault occurred.
Check wiring to ensure no shorts across output leads.
Yellow Blink
Configurable/On
(Note 2)
CAN bus detected but no commands are being received. Most
likely no CANdle object created in software.
Green Blink
Configurable/On
(Note 2)
CANdle is actively controlled either via CAN or through the pixel
pulse train.
Note 1:
Software configuration allows customers to turn off tri-color LED when loss of signal occurs (CAN bus or pulse-train) as some applications
may require absolutely no light when disconnected. In such a case, consider this as a potential cause of why the LED is off.
Note 2:
The outputs are controlled by software configuration.
