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HDX FDX-B Long Dstance Card Reader1. Introduction This is a low frequency card reader module based on RFID technology, which supports ISO 11784/5 international standard protocol. It can read all HDX and FDX-B tags remotely. HDX ear tags can be read up to 80cm, read underground pipe labels up to 220cm. The module communicates through UART, and users can read the tag by sending simple commands through UART without having to understand the complex RF communication protocol, it is widely used …