Connection timeout -MKS Gen L

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1

I need some help please,
I saw some issues like mine but none for a MKS gen L, I looked into the others trying to look for any clues to my situation but couldn't make any progress

I had no problem the first time I flashed but a week ago it started to act funky and wouldn't let me upload new Klipper printer.cfg files so i decided to flash again Octoprint, now I'm getting this 'timeout connection' error message

  • i changed usb cable (short original one)
  • lowered baudrate
  • switched the usb port
  • bought a new micro sd (32gb)
  • I even tried with a different board

rpi 3b+
mks gen L
Tronxy x5s
Windows

Serial log looks like:
2019-06-26 06:01:27,967 - Connecting to: /dev/ttyUSB0
2019-06-26 06:01:27,989 - Changing monitoring state from "Offline" to "Opening serial port"
2019-06-26 06:01:27,995 - Connected to: Serial<id=0x6ef2edf0, open=True>(port='/dev/ttyUSB0', baudrate=250000, bytesize=8, parity='N', stopbits=1, timeout=10.0, xonxoff=False, rtscts=False, dsrdtr=False), starting monitor
2019-06-26 06:01:27,997 - Changing monitoring state from "Opening serial port" to "Connecting"
2019-06-26 06:01:28,013 - Send: N0 M110 N0*125
2019-06-26 06:01:38,999 - There was a timeout while trying to connect to the printer
2019-06-26 06:01:39,009 - Changing monitoring state from "Connecting" to "Offline"
2019-06-26 06:01:39,021 - Connection closed, closing down monitor

octoprint (1).log (98.7 KB) serial.log (296 Bytes)

2

Have you tried setting your firmware to use a lower baudrate. I have one printer that just can't keep up with 250000 for some reason. Also, what happens when you just set the port and baudrate to auto?

3

Thanks for helping Terry,
I have tried auto and I tried also the 125 baudrate but it ends the same with a connection error

4

Why do you want to change these? These work on my setup which is pretty much identical to yours except that my printer is an Ender 3 but with an MKS Gen L.
You seem to have tried everything I would've tried. Except replace the RPi. Any chance you have another one you can try? If not, it may be worth buying another one. It doesn't hurt to have a spare lying around.

5

I was thinking about it, I would however like to know if it is a faulty RPi or if there is something in the code that could be changed to solve it

6

I'm starting to belive that there is something to do with traces of older installition interfering - now I have this problem with the board Klipper was already installed on but not with a new one..

7

FYI:
XON/XOFF is a software flow control that is not used on every serial connection.
RTS/CTS and DSR/DTR are for hardware
flow control and require more connections.
These flow controls belong tor the RS232 standard: https://en.wikipedia.org/wiki/RS-232

8

Ok.
But like I suspected it was due to the older installation, I reinstalled Klipper and the problem was gone - no idea how to explain it because of lack of knowledge :man_shrugging:t2: