Wireless I/O Modules products ICP-DAS products Remote I/O Module and Unit Wireless I/O Modules ZigBee ZigBee is a specification based on the IEEE 802.15.4 standard for wireless personal area networks (WPANs). Wi-Fi The WF-2000 and tWF series support Modbus/TCP and UDP protocol and the network encryption configuration, which make perfect integration to SCADA software. RF RFU-IO is a RF wireless I/O unit that uses the Modbus communication protocol. It can be equipped with an ICPDAS XV series I/O module.