Ax terminal blocks perform two functions: ADC and low voltage load control. Before measuring voltage, set the corresponding low voltage load control output to the "off" position. For example, if you are connecting to terminal A1, disable A1_OUT in the web interface (section Relays & FETs).
Connect your source to the terminal. The voltage value will immediately appear in the web interface on the ADCs. The value is also translated into the MQTT message system.
