Re: [E3-hacking] E3 serial connection

On Tuesday 21 February 2006 18:08, Jonathan McDowell wrote: [...]

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• If you just wire it up, it may work, but you run some risk of frying

the UART in the E3.

True; I have mine wired up at present with no converter or level shifter.

Hmm.

[...]

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• You can wire it up to an E2 line level converter and it will work.

True if taken together I believe; you need an E2 style converter plus an inverter.

If I were to wire it up to an E2 converter *backwards* --- so that logic 0 was -5V and logic 1 was 0V --- would the tolerances in the E3's UART and the converter's own chip make it work? After all, if the E3 can cope with +/- 25V for RS232, it ought to be tough enough to manage -5V...