View source for Talk:RPi Serial Connection

I have confirmed that this adapter works with a synology TTL serial comm port. [[1]] also confirmed the voltage is 3.3 from this convertor as loads of people were worried about degradation or failure using a 5v ttl serial convertor Waiting on the real thing to try it out.

Fassett (talk)

I suggest to create a new page regarding the manual configuration needed to prevent Linux from using the serial port and place a link here because a) the text of that section is by far much longer than the other 2 methods b) almost everybody will use the other 2 methods and very-very few the manual one

When the serial port is opened there is a 32 us negative pulse on TXD (http://www.raspberrypi.org/forums/viewtopic.php?f=44&t=49867). Although many devices are error tolerant and thus not affected by this glitch, some are not and cannot easily be modified to deal with it. I would like to add a section to this page describing the glitch and how it can be avoided. It is difficult to search for information about this glitch. I did not find the linked forum post until I included 32us in the search string, and I only thought to measure the pulse because I was writing a new forum post myself. The glitch occurs when the serial port is opened, so the solution is to keep it open. This can be accomplished in bash with:

cat >/dev/ttyAMA0 &

If there are no objections I will add a small section on this glitch to this page in a few days.