2.3.2. LED2.
The LED2 on the front panel indicates the state of USB interface
LED2 state
Description
Constant red light
There is a USB connection at the Full-Speed (up to 12 Mbit/s)
Non-periodic short red
light
Data transfer via USB at the Full-Speed (up to 12 Mbit/s)
Constant green light
There is a USB connection at the High-Speed (up to 480 Mbit/s)
Variable green light
Data transfer via USB at the High-Speed (up to 480 Mbit/s)
Yellow orange light
No USB connection (no cable connected, no drivers installed or the PC
operational system has not found a USB-device E-502)
Periodically changing
red-green glow
E-502 is in the service "bootloader" mode, or after holding RESET
button, or in the software update process.
No lights
Power is off
Slow periodic red light
after power is on
SDRAM test error.
If the E-502 got into this state after power-up, this could be either a sign
of E-502 failure or a sign of the heavy external electromagnetic
environment in which the E-502 is located, which led to a malfunction.
Contact the "L-Card" technical support if the E-502 gets into this state
after turning on the power.
2.3.3. LEDS Link and Activity (on LAN connector) in modifications E-502-P-EU.
Link LED status
Description
Yellow glow
Connected to Ethernet
No glow
No Ethernet connection
Note: in the current manufactured products, the opposite logic of the LINK LED illumination
is possible (this feature is not a malfunction of the E-502). But, in any case, if E-502 is programmed
to operate with USB,
Link
and
Activity
LEDs will not glow.
Activity LED status
Description
Green glow
Data transmission via Ethernet
No glow
No data transmission via Ethernet
How to programmatically resolve the Ethernet interface, explained in p.
2.4. RESET functions
The secret reset button is used to reset the ARM controller, after which the E-502 will normally
restart the ARM-controller. For a normal restart, briefly press the RESET button.
