The module PICO-EXT is an extension module for the PICO family (PICO-O2, PICO-PH, PICO-T). This module provides 4 analog outputs and a Modbus interface. The module has two digital interfaces, a RS485 interface and a UART interface. The UART interface is connected to the OEM module from the PICO family. The RS485 interface can be connected to a Modbus bus. The 4 analog outputs consist of 2 current outputs and 2 voltage outputs, which can be used even if the module is not operated via the Modbus interface. The module PICO-EXT can only be operated, if a PICO module is connected to them. If this is not the case, the PICO-EXT will not start up and no Modbus communication is possible!