Linux USB to Serial Port Converter Question

Targets Linux
21

I think that RS232 doesnt provide for supplying power, so using the DTR (or any other line) for that purpose is going to be at the mercy of the driver and the power that the USB-RS232 is able to provide.

there are LOTS of articles on a DDG search saying that linux is not good at supporting DTR/DSR

you might try running something like

stty -F /dev/ttyUSB0 2400 -crtscts cdsrdtr

before you start your program and then reading /dev/ttyUSB0 as a regular file in Xojo

but then, i seem to recall that was what i did on SCO Unix in bash scripts. it may not be useful in linux.

22

Sure, well, I’m pretty sure it’s a Xojo issue because we were able to communicate regularly via CuteCom. The client found that DTR does get set via CuteCom but not via the Xojo application.

If you have any reference articles I’d love to pass them on to the client.

23

Hi Bob,

here are two threads from ubuntu showing similar issues. They are a little old, but then RS232 is quite old.

http://askubuntu.com/questions/465628/my-prolific-technology-inc-pl2303-serial-port-adapter-doesnt-work-in-either-u

see answer #4
http://ubuntuforums.org/showthread.php?t=1717311

if you get me the wiring diagram of the serial connection, i can mock it up and see if i can find a way to make it work.