Hello

I am trying with a ucontroller using minicom.
When i use with SL6 (Scientific Linux 6), when i start minicom i get no response, only:

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Welcome to minicom 2.3

OPTIONS: I18n
Compiled on Mar 22 2017, 12:42:01.
Port /dev/ttyUSB2

Press CTRL-A Z for help on special keys
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I know it work, because when i use my laptop with ubuntu 20 it works. But due software question with the programs i am using i realy need to use SL6.

Thank you in advance

That seems a normal response, so are you saying CTRL-X or CTRL-A Z doesn't work? Did you start it as root, or use sudo?

Change the flow control settings (CTRL-A-O -> Serial port settings -> F and/or G).

If you get no response, it's probably because Minicom expects a handshake line to go active, while the equipment isn't using hardware handshaking at all.

It works, but i cant type or send anything to the hardware i am communicating

I already put NO flow control in hardware and software, and in my Ubuntu machine it works!!!

Well you can turn on local terminal echo to confirm the appnis working.

Have you confirmed that the resource is ttyUSB2? Nothing saying it's going to be identical from distro to distro And what about echo to or cat from that resource?

It would have been helpful if you had mentioned that in your initial post.

That leaves the speed settings, and of course the actual serial port device name, as mentioned by rmistler.

The terminal Local echo works fine, with ctrl a + e.

I typed in terminal , and only appears Sorry, for not mentioning
So i put the speed to 460800 , 8N1

And you're sure that's correct?

The 8N1 part seems reasonable, but 460800 is just ridiculously fast for most terminal applications, and wouldn't even be supported by many serial ports, as older chips max out at 115200.

yeah, its correct

It almost looks like ttyUSB2 is a "stale" device. If you unplug and reconnect the device does the system create ttyUSB2?

Do you have any udev rules to always create ttyUSB2 for this device?

No, it changes the port name. Now its in USB0, but i always change this in minicom port configuration, so thats not the problem

Well if you confirm the device name, you can use stty to see the port settings, and adjust them actually. Determine if 460800 is valid or something else.

You actually can use two terminals, one to echo to the port and one to cat the output from the port:And in the other terminal:To test operation.

Ok, i did this and got nothing in the terminal that i wrote the cat command

It would be nice to know more about this ucontroller and what chipset it is using. Post the output of the lsusb command for the device.

Here it is

Bus 001 Device 007: ID 10c4:ea60 Cygnal Integrated Products, Inc. CP2102/CP2109 UART Bridge Controller [CP210x family]