Use this article when no data is visible on the dashboard and you want to check whether the gateway itself is the cause.
In this step, you check the LED indicators on the gateway to determine:
whether the gateway is powered on,
whether it is connected to the cloud,
and whether it is able to send data.
You are doing this to rule out power, connectivity, startup, or signal issues before checking configurations or data sources.
The LED status gives immediate feedback on what the gateway is doing.
Based on the LED behavior, you can decide:
whether to wait,
whether to take corrective action,
or whether the issue is not caused by the gateway.
Identify your gateway type
Calculus gateways use different LED layouts depending on the model.
Click on the name of the model to go to the relevant section below.
C04
2 LEDs (Power and Status)C06W / C07W
5 LEDs (Power, Status, Connected, Expansion LEDs)CX
Multiple LEDs without individual meanings
C04 Gateway
What to check
Power LED
Green (solid)
The gateway is powered on.
If something is wrong
Off
The gateway is not receiving power.
Status LED
Green (solid)
The gateway is connected and operating normally.Blue (briefly on during startup)
The gateway is starting up.Purple (blinking)
The gateway is running on its internal battery and will enter sleep mode.Other colors
The gateway is updating its software.
If something is wrong
Red (solid)
The gateway is not connected.
What this means for missing data
If the Power LED is off, the gateway cannot send data.
If the Status LED is red, the gateway is not connected and no data will be sent.
If the gateway is updating or starting up, data may not be available yet.
What you can do
Make sure the gateway is powered on.
Allow 10 minutes after startup or updates.
Restore external power if the gateway is running on battery.
Restart the gateway if the Status LED remains red for more than 10 minutes.
Check that all antenna connections are firmly attached to the gateway.
If the Status LED remains red after an hour:
Replace the gateway.
In depth explanation
If you want to have a more in depth knowledge about the behavior of the LEDs, check the following article.
C06W / C07W Gateway
What to check
Power LED
Green (solid)
Gateway is powered on.
If something is wrong
Off
The gateway is not receiving power.
Status LED
Green (blinking)
The gateway is starting up.Green (solid)
The gateway is operating normally.Red–Orange (blinking)
The gateway is restarting automatically.
If something is wrong
Red (solid)
The gateway has detected a problem and is restarting.
Connected LED
Green (solid)
The gateway is connected to the cloud.Red (blinking)
The gateway is waiting for a connection.Orange (blinking)
Data is being uploaded.
If something is wrong
Red (solid)
The gateway is not connected to the cloud.
What this means for missing data
If the Power LED is off, no data can be sent.
If the Connected LED is red, the gateway is unable to connect to the cloud.
If the gateway is restarting, data may be temporarily unavailable.
What you can do
Check the power supply and cabling.
Check that all antenna connections are firmly attached to the gateway.
Wait 10 minutes during startup or restart.
Restart the gateway if the Connected LED remains red for more than 10 minutes.
If the Connected LED remains red after an hour:
C06: replace the gateway.
C07: check whether the SIM card is present, correctly inserted, and clean.
In depth explanation
If you want to have a more in depth knowledge about the behavior of the LEDs, check the following article.
CX Gateway
What to check
After power-up, the logo should light up within a few minutes.
The logo should briefly animate and then turn solid green.
Indicator lights at the bottom of the device may show:
Blue: The device is initializing or configuring.
Orange: Insufficient signal strength.
When external power is removed, all LEDs turn red.
This is expected behavior. Normal operation resumes automatically when power is restored.
If something is wrong
The logo does not turn solid green.
The bottom indicator light is orange.
What this means for missing data
If the device never reaches a stable green state, data may not be sent.
Poor signal strength can prevent data transmission.
Battery operation is temporary and may interrupt data transmission.
What you can do
Ensure the device is powered on.
Improve reception by repositioning the device.
Restore external power if the device is running on battery.
Contact support if the device does not complete startup.
In depth explanation
If you want to have a more in depth knowledge about the behavior of the LEDs, check the following article.
Summary
Gateway LEDs help determine whether missing data is caused by:
Power issues
Connection problems
Startup or update processes
Signal quality
Checking the LEDs first helps avoid unnecessary configuration changes and narrows down the cause.
If the LEDs indicate normal operation and no data is visible, continue troubleshooting by checking the current activity of the assets.