LED indication

Edge

This article contains the description of LED indication and all device states of Unipi Edge.

Description of indications LEDs

Label	Function	Meaning	Colour
PWR	On	Supply voltage indication	Red
ACT	Blinking	Indicates that operating system is running Can be customized	Green
Digital inputs (DI)	On	Indication of log.1 at the input	Green
Digital outputs (DO)	On	Indication of output in active state	Green
TX (S)	On	Indication of serial line broadcasting	Green
RX (S)	On	Indication of serial line receiving	Green
User LEDs (X)	Selectable	Programmable user LEDs	Green
WiFi (optional)	On	Indication of wireless connection	Green

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Note:
Behavior of the ACT LED can be changed. You can find the setting in /sys/class/leds/act-led/. It is set to timer mode by default

Description of LTE LEDs

LED	OFF	ON	Flashing
SIM	LTE service (daemon) is not active (disabled or not installed)	SIM is OK	Slow - No sim inserted (or SIM corrupted) Fast - wrong PIN
NET	Not registered to LTE network	Registered to network	—
SIG	No signal	Excellent signal	Signal quality - faster ∼ better
INT	No WAN access	Unit online, backup active (or single interface only)	Slow - connected via the primary WAN interface, backup inactive Fast - connected via backup WAN interface

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Note:
All LEDs flashing — LTE module is restarting.

Description of the individual device states

The following chapters describe all LED states for the Unipi Edge:

Normal startup
Run in service mode
Upload/Backup OS
Standard functions - communication via RS-485, DirectSwitch indication, MasterWatchDog, …
FW update on I/O boards

All LEDs are off

State: Power-Off

The unit power supply is unplugged. If the PWR LED does not change its state on the unit even after connecting the power supply, try another power supply. If the state does not change after replacing the power supply, it is likely that the unit has been damaged. In this case, please contact technical support.

PWR is On

State: Power-On

The unit is powered. If the unit is run in regular or service mode and it remains in this state longer than a minute without change, it is possible that it is damaged. In this case, please contact technical support.

This state also happens, when the unit is in initialization mode.

PWR is On, ACT is On with short blinks

State: OS on main processor is running

ACT LED:
ON: 2000ms / OFF: 50ms

The device's OS is running. The device works correctly.

PWR is On, ACT is On with short blinks, TX and RX are blinking

State: RS-485 traffic

TX/RX LED:
randomly blinking

The program in the unit communicates via a serial line S1-RS485.

PWR is On, ACT is Off and the rest is blinking

State: Service mode

Blinking speed:
ON: 600ms / OFF: 600ms

Unit is in service mode.

PWR is On, ACT is Off and the rest is blinking rapidly

State: Flashing/Backup

Blinking speed:
ON: 80ms / OFF: 80ms

Indication of flashing or backup of OS.

Description of special states of the unit

DirectSwitch function

The DirectSwitch function is implemented directly in the microprocessor of the I/O and is therefore independent of the control SW i.e., also of communication with inputs and outputs. You can read more about this function in the article about description of inputs and outputs. The function can be configured in one of three modes, their short description and illustrative LED indication can be found below:

DirectSwitch Copy

Input state is copied to the output.

DirectSwitch Inverse-copy

Negated state of the input is set on the output.

DirectSwitch Toggle

If a rising edge is detected on the input, the output state is negated.

Master Watchdog

If the function is enabled on the microprocessor, the processor continuously monitors the communication from the computing module. If no commands are detected during the set time, the section processor automatically restarts and sets the saved default configuration. You can read more about this function in the article about description of inputs and outputs.

I/O board firmware update

When flashing FW I/O board, all LEDs in the top and bottom row are On, except for every fourth. LEDs that are not fitted are also included in this rule.

Completion of the update is indicated by turning On every second LED and subsequent restart of the I/O board is indicated by turning On all LEDs, including ACT.

The Unipi Edge unit can run in three modes. In the regular, in the service and in the initialization mode. Each of these modes is indicated by a specific blinking of the LEDs.

In regular mode

In regular mode, you may encounter the following LED states:

Behaviour description	Meaning	Off	On
All LEDs are on for 300 ms	Start of the processor (power connection)	-	300ms
Every other is on (even)	SW reset of processor	-	1000ms
All but every fourth light is on	Firmware update. Do not turn off the unit!	-	>1000ms

Service mode

(i)

If you are looking up for a guide on how to enter and use the service mode, please visit this article.

The SERVICE (SVC) button is pressed and held before plugging in the power supply. After plugging the power supply in, the “uboot” bootloader will start first. The SERVICE button can be released approximately 5 seconds after plugging in the power supply.

After a while, the service mode starts, indicated by the slow blinking of all diodes, except PWR and ACT.

Initialization mode

(i)

If you are looking up for a guide on how to enter and use the initialization mode, please visit this article.