Cellular Connection state and Signal Strength

Supported hardware and firmware

The “Cellular Connection state and Signal Strength”-report is available on the x530/x540 in firmware 3.16 and up. Please upgrade your firmware if you are running an older version.

This article explains a feature added in firmware 3.16, which informs you about the current state of the cellular connection. This, in turn, helps you to better understand the current state and easily see if any changes you make have a positive impact.


Lenze x530/x540 models can be connected via a cellular network and have a connection to the X4 Cloud in this way. While cellular providers have improved the stability of their networks over time, bad signal or a bad connection might still occur (not always due to the fault of the provider).

The cause of these problems can be cumbersome as we see in the following examples:

  • The factory hall can act as a Faraday cage;
  • The masts of the service provider are too far away;
  • Other devices create too much noise;
  • The SIM provider doesn’t allow a M2M connection;
  • The settings of the SIM card are set incorrectly;

Via the “Cellular Connection state and Signal Strength”-report, the local web interface on the x500, it is possible to troubleshoot most of these problems by yourself as it provides the necessary information on the cellular signal and the connection.

How do I access this report?

You can access the cellular report by following the next few steps. If you are connected to the LAN of the x530/x540, you can skip step 1.

  1. Set up a VPN connection (details).
  2. Look up the LAN IP address of the x500 (visible on the x500s [Config] tab in the X4 Cloud).
  3. Open a new tab in your browser and enter the x500s LAN IP address.

Details explained

The web interface will only show information when the cellular connection is enabled and may look as follows:



It is not possible to change the configuration of the x500 via this interface.

If the x500 is online, you can make the necessary changes online and push these to the x500. If the router is offline, you can create a new configuration file to change the WAN configuration. Do not remove the x500 from your company and don’t forget to import the device configuration onto the X4 Cloud once the x500 is back online.

The available information is divided into three parts:


The section provides all the information regarding the SIM card and its state.

StateOverall state 
Card stateShows if the SIM card is presentCards can get stolen or in a very rare case the SIM card isn’t recognized
Pin stateTells if a pincode is set via the configurationIt doesn’t show the actual pincode
ErrorDescription in case of error state 


The section provides all the information regarding the cellular signal.

TypeThe type of the connectionThe following connections are possible: lte, umts, gsm, cdma, td-scdma
ConnectionHuman interpretation of signal 
RSSIReceived Signal Strength Indicator (RSSI) is an estimated measurement of how well a device can hear, detect, and receive signals from each access point.The following formula is used:
RSSI = noise + serving cell power + interference power.
This value is only present with LTE-30 dBm is Very good
-67 dBm is Good
-70 dBm is OK
-80 dBm is Not Good
-90 dBm is Useless
RSRQReference Signal Received Quality (RSRQ) indicates the quality of the received reference signal. The RSRQ measurement provides additional information when RSRP is not sufficient to make a reliable handover or cell reselection decision.This value is only present with LTE>= -10 dB is Excellent
-10 to -15 dB is Good
-15 to -20 dB is Fair to Poor.
<-100dB is No Signal
RSRPReference Signals Received Power (RSRP) is the power of the LTE Reference Signals spread over the full bandwidth and narrowband.This value is only present with LTE>= -80 dBm is Excellent
-80 to -90 dBm is Good
-90 to -100 dBm is Fair to Poor
<-100dm is No Signal
SNRSignal to Noise Ratio 


The section provides all the information regarding the network connection.

TimeCurrent time on the x500To correlate screenshots for example
StateCurrent state of setting up network connectionSearching
APNThe Access Point Name (APN) is used to tell to the carrier to which Packet Data Network (PDN) a mobile data user wants to communicate with. Without an APN the carrier doesn’t have all the information to set up the correct connection for the device.Every SIM provider has one or multiple APNs. If the APN isn’t provided with the SIM card it is advisable to contact the provider to obtain the correct APN.
PLMNPublic Land Mobile Network (PLMN) shows the specific operator and the region it is operating in. For example: T-Mobile. 
RoamingModem roaming modeIf the modem has to register on a non-native network.
Data connectionActual data connection activeWhen no connection active check APN or SIM card activated.

Easy access

If you would like to check the cellular connection and the signal strength easily via the X4 Cloud (on a regular base), you can! Simply add an HTTP service following these few steps:

  • Go to [Services] and add a service .
  • Enter the target’s name (e.g. “x500”), leave the IP address blank, and click on [Next].
  • Select the service type: [HTTP server].
  • Change the name of the service (e.g. “Cellular information”) and click on [Add].

The service is now created and easily available from the [Info] tab.