We have bought one and can confirm that it doesn't exist! It is only a copy of version 1.2 masquarading as 1.5. Online, you will also find common version 1.5. The official versions currently in circulation are 1.3a and 1.4b, 2.1 At their heart is an ELM327 circuit.Īnother thing which may be confusing is the "firmware" version. Only their external aspect and the connection type differ. It's the most expensive one.īelow for illustration, is a photo of the 4 types of interface using this integrated circuit (electronic chip):įrom left to right: a metal box USB interface, a plastic box, a Bluetooth version and the latest WiFi versionĭespite appearances, these 4 interfaces are practically identical, at least electronically. Only the WiFi interfaces can be used with the iPhone/iPad.
Advantages: all PCs are equipped with a USB port. ELM327 USB: A bit more expensive that the RS and requires installation of a USB driver (FTDI or Silicon Labs).ELM327 RS232 (RS or Series): This type of output is gradually disappearing from modern PCs.Right now, there are 4 types of ELM327 interface: And ELM322 supports VPN and the ELM323 KWP. The other interfaces only support one protocol. The most common use a chip made by ELM Electronics.ĮLM327 is the most widely used and practical, supports all OBD protocols. ELM circuit for electronics technicians.Tips and advice for using ELM327 interfaces.
Operating principle of the ELM327 interface.
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