subscribe to our Youtube
Thank you for your question,
Please specify what kind of sensor are you using,
In most cases you can connect LLS fuel sensors using RS232 / RS485.
Please make sure to select the RS232 / RS485 as LLS, if this type of sensor is connected. In other cases you can also use RS232 TCP link mode.
Please check the FMB125 wiring scheme on available connections.
More description on modes can be found in our wiki: