• USB2Serial-Adapter (e.g. CP2102 or FTDI, known problems with Profilic- and ch340g-Chipsets)
• using Uart-Pins (not 40-pin-connector)
• each TX ⇒ RX (r2 tx to rx of usb2serial, tx of usb2serial to r2 rx)
• application for PC:
  • Linux: minicom
  • Windows: putty
• settings: 115200 8N1 FlowControl: off

micro-usb-cp2102-adapter: https://www.ebay.de/itm/CP2102-MICRO-USB-to-UART-TTL-Module-6-Pin-Serial-Converter-STC-Replace-FT232/401269171476

Windows-driver for CP2102: https://www.silabs.com/products/development-tools/software/usb-to-uart-bridge-vcp-drivers cp210x_universal_windows_driver.zip

reg-file Putty-session (com-port must be changed): bpi-r2-serial-putty-reg.zip

first get name of device:

grep ttyUSB /var/log/syslog
Oct 15 12:44:59 Frank-Laptop kernel: [ 5113.456306] usb 3-1: cp210x converter now attached to ttyUSB0

ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 Mai 10 15:12 /dev/ttyUSB0
#add current user to group dialout (for access to tty-device)
sudo adduser $USER dialout
#login/logout needed to join the group
#show groups of the user
groups
frank adm dialout cdrom sudo dip plugdev lpadmin sambashare

Install minicom & setup

sudo apt-get install minicom
sudo minicom -s

          +-----[configuration]------+
          | Filenames and paths      |
          | File transfer protocols  |
          | Serial port setup        |  <<<<<<<<<<<<
          | Modem and dialing        |
          | Screen and keyboard      |
          | Save setup as dfl        |
          | Save setup as..          |
          | Exit                     |
          | Exit from Minicom        |
          +--------------------------+

  +-----------------------------------------------------------------------+
  | A -    Serial Device      : /dev/ttyUSB0                              |
  | B - Lockfile Location     : /var/lock                                 |
  | C -   Callin Program      :                                           |
  | D -  Callout Program      :                                           |
  | E -    Bps/Par/Bits       : 115200 8N1                                |
  | F - Hardware Flow Control : No                                        |
  | G - Software Flow Control : No                                        |
  |                                                                       |
  |    Change which setting?                                              |
  +-----------------------------------------------------------------------+

• “save as .dfl”
• “Exit from Minicom”

now start minicom as user (without sudo)

exit with Ctrl+a,q or Ctrl+a,x