This document can be found at the following address. Click on the images to enlargeIn the event of malfunction:ELM Electronics has created a very good and practical application note with the voltage levels and a test procedure. The manufacturer FTDI with the component FT232 (more details on the ) and Silicon Labs with the component CP210x (more details on the ).Bluetooth interfaces use an RS interfaces use an RS modem.WiFi allows wireless communication. There are currently two families of components in the ELM327. The difference lies mainly in the components connected to pins 17 and 18 of U1 (ELM327 integrated circuit).For USB interfaces, a VCP (Virtual COM Port) component is used to 'convert' an RS link into USB like USB adaptor cables RS232.
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