A new line of Modbus based IO modules for data acquisition and other applications are available now. These IO modules offer good reliability, low-cost solution for distributed IO applications. They are portable, easy integrated with existing Modbus network, and simple to use for end users. Various types of IO modules are available for different kinds of requirements. All IO modules have LED indications for visualisation of IO status (Digital) and fault diagnostic analysis. Some models with high isolation among inputs are also available for special applications. IO Studio software is used to setup communication of IO modules and checks the IO status in PC for diagnosis purpose. With modes RTU protocol, these IO modules configured as slaves will be easy to communicate with Modbus master such as SCADA/PLC/HMI. All IO modules have 2 wire RS485 interface with Modbus RTU Protocol.