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Privacy PolicyHere’s a helpful write-up about and the download process. Understanding PLX DAQ: A Bridge Between PLCs and PCs PLX DAQ (often referred to as PLX-DAQ) is a free data acquisition add-on tool for Microsoft Excel, created by Parallax Inc. It allows Excel to read live data from various hardware devices—most commonly PLCs (Programmable Logic Controllers) using Modbus RTU/TCP , as well as microcontrollers like the Parallax Propeller or BASIC Stamp.