Re: serial port question

On 10/5/23 17:28, paul beard wrote:
> Not strictly FreeBSD-based but adjacent, surely…
> 
> I have a 3D printer that has a serial port connection through USB but 
> it's not working through the various apps that obscure the details in 
> the name of "convenience." You know what I mean. I like convenience as 
> much as anyone but sometimes I just have to get on with it. Does anyone 
> have experience in communicating with really simple machines over a 
> serial connection? It's not always easy to ID the serial device but 
> that's a separate problem. Allegedly I can communicate up to 115k but 
> I'll settle for a lot less to send simple commands like M502 or M500.

   If memory serves, multiple device permissions may be needed for the 
one device node to work. I had the following rules in a /etc/devfs.rules 
entry (which involves a header+/etc/rc.conf entry fi I recall). Likely 
only the first two mattered but I don't remember now.
add path 'cuaU*' mode 0777 group operator
add path 'ttyU*' mode 0777 group operator
add path 'usb/*' mode 0660 group operator

   Other posts are also correct about some software not searching 
through port labels when they vary from Linux. Most of my effort was put 
toward keeping a Makerbot Thing-O-Matic working off and on over the 
years but that kept me mostly just playing with replicatorg due to its 
incompatibilities with other software that I someday need to setup a 
workflow to migrate to. reprap software I had started to get basic 
control from but recall manually patching its list of checked and 
available ports when I did it years ago.

   It isn't recommended but I have been known to either test software as 
root, or change many more permissions than I need to figure out how to 
get things working.

   If you say what printer/software you are working with, others may be 
able to chime in with more specifics.