maemo.org - Talk - Headphone-port to serial

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Headphone-port to serial

Headphone port of Pinephone can switched to serial port with dip-switch, I know there is cable for USB-port that make it look to PC as serial port.

But my question what hardware needed to make headphone-port more like standard RS232C serial port (accept +/- 15V input) or midi i/o ports (31,250 baud 5V) or RS-422 (+/- 6V), now port is 3.3V. I think software side is ready for that.

Re: Headphone-port to serial

Is this what you were looking for? It describes the serial port configuration, including the pinout and signal levels.

It sounds like you want a signal level shifter. It is pretty simple to make if you have an electronics background, or you can get some off-the-shelf product, such as this (note I don't know anything about that product, I only just found it by typing "3.3V to RS232" in DDG).

Re: Headphone-port to serial

Quote:

Originally Posted by pichlo (Post 1575672)

It sounds like you want a signal level shifter. It is pretty simple to make if you have an electronics background, or you can get some off-the-shelf product, such as this (note I don't know anything about that product, I only just found it by typing "3.3V to RS232" in DDG).

I think I tried same query with DDG some days ago and I didn't get that, it looks good "Maximum RS232 voltage range of the IC can receive is –25V to +25V" so I don't brake it easily...it seems that it only need power of 3.3V, so it should look almost ready solution. Although RS232C port should be male not female. Anyway thanks.