Connect MKS-SGEN_L-V2 and RPi3 via RX TX

[rom-ka1]

Hello! No connection MKS-SGEN_L-V2 and RPi3 via RX TX, using port AUX-1.

3-pin connector cable MKS-SGEN_L-V2 GND(black) TX(blue) RX(red) -> RPi3 GND(black) TX(red) RX(blue)

/boot/config.txt add dtoverlay=pi3-miniuart-bt

/boot/cmdline.txt delete console=serial0,115200

printer.cfg

[mcu]
serial = /dev/ttyAMA0
restart_method = command

make menuconfig

[*] Enable extra low-level configuration options
    Micro-controller Architecture (LPC176x (Smoothieboard))  --->
    Processor model (lpc1769 (120 MHz))  --->
[*] Target board uses Smoothieware bootloader
    Communication interface (Serial)  --->
(250000) Baud rate for serial port (NEW)
[ ] Specify a custom step pulse duration (NEW)
()  GPIO pins to set at micro-controller startup (NEW)

Using a USB cable, there is a connection. klippy.log

[rom-ka1]

Installed Octoprint and Marlin, the connection via RX TX works.

I installed the klipper on octoprint, the connection via the USB cable is working.

Configured via RX TX, the connection does not work.

in the logs the same connection error.

Starting serial connect
Timeout on connect
Wait for identify_response
Traceback (most recent call last):
  File "/home/pi/klipper/klippy/serialhdl.py", line 65, in _get_identify_data
    params = self.send_with_response(msg, 'identify_response')
  File "/home/pi/klipper/klippy/serialhdl.py", line 249, in send_with_response
    return src.get_response([cmd], self.default_cmd_queue)
  File "/home/pi/klipper/klippy/serialhdl.py", line 306, in get_response
    cmd_queue)
  File "/home/pi/klipper/klippy/serialhdl.py", line 241, in raw_send_wait_ack
    raise error("Serial connection closed")
error: Serial connection closed

[mks-viva]

You can sned 'ls /dev/serial/by-id/*' and get serial port

[rom-ka1]

[mks-viva]

You can try to restart putty.exe

[rom-ka1]

Restarting. Nothing changed.

[rom-ka1]

I need to connect via UART, not via a USB cable.

[mks-viva]

I have not tried using the serial port