ModProBus RF Modbus Modem What is ModProBus Modem? ModProBus RF modem is a product that enables wireless transmission of incoming data via RS232 and RS485 ports. Data communication can be made with ModProBus modem in wireless Modbus RTU and wireless Modbus ASCII protocols. It can work in harmony with many industrial products such as Scada, PLC, HMI Panel, Industrial I/O, and thus offers an advanced solution for wireless automation systems.