EST-520 display manual

[alan_sh]

I found the official document quite sparse and hard to read, so I've created my own and included all the error codes I could find. Feel free to download and share it.

https://www.dropbox.com/s/dpuxvjc63eiberl/Controlling%20the%20EST-520%20V2.2.pdf?dl=1

Any questions, just ask.

Alan