Accessing the target system (Dunfell)

Owned by Hai Nam Tran
Last updated: 24. Jan 2023 by Bernd Mierzowski
3 min read

There are several ways to access the target SECO Northern Europe System from a host system, including:

  • Serial console: console access via RS-232

  • SSH: encrypted console access and file transfer over Ethernet

  • SFTP: file upload and download over Ethernet

Each of the following chapters describes one of these possibilities and, where applicable, gives a short example of how to use it. For all examples, the SECO Northern Europe target system is assumed to have the IP address 192.168.1.1.

Serial console

The easiest way to access the target is via the serial console. In order to connect to the serial console, the following method is recommended:

  • RS232 on Molex Micro-Fit connector

To use the RS232 connection, connect the first RS232 port of your target system using a COM port of your PC or a USB-to-RS232 converter using a null modem cable.

For a working connection, the signals TXD and RXD have to be connected cross-over in the same way like a null modem cable does. The location of the RS232 connector and the necessary pins can be found in the hardware manual corresponding to your device. RS-232 cable will be a part of the starter kit which you would have received along with the device..

Example: Location of the RS232 connector on a 7" device (upper) and on a 5" device (lower)

Pin

Name

Description

Pin

Name

Description

1

GND

Ground

2

RS232_TXD1

Port#1: Transmit data (Output)

3

RS232_RXD1

Port#1: Receive data (Input)

4

RS232_RTS1

Request-to-send (Output)

5

RS232_CTS1

Clear-to-send (Input)

Example: Pinning of the RS232 connector

With the serial connection set up, start your favorite terminal program (e.g. minicom) with the following settings:

  • 115200 baud

  • 8 data bits

  • no parity

  • 1 stop bit

  • no hardware flow control

  • no software flow control

If you are using the RS232 connection, you should see debug messages in the terminal from the very first moment when the target is powered. After the boot process has finished, you will see the Linux login shell:

Garz & Fricke Yocto BSP (based on Poky) @VERSION@ santaro /dev/ttymxc0 santaro login:

You can log in as user root without any password by default.

If you face any problem in connecting the PC to HMI using RS-232 cable Please refer the following

trouble shoot link

SSH console

Using SSH, you can access the console of the device and copy files to or from the target. Please note that SSH must be installed on the host system in order to gain access.

To login via SSH, type on the host system:

$ ssh root@192.168.1.1

The first time you access the target system from the host system, the target is added to the list of known hosts. You have to confirm this step in order to establish the connection.

The authenticity of host '192.168.1.1 (192.168.1.1)' can't be established. RSA key fingerprint is e5:86:89:19:50:a5:46:52:15:35:e5:0e:d2:d1:f9:62. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '192.168.1.1' (RSA) to the list of known hosts. root@santaro:~#

To return to your host system’s console, type:

You can use secure copy (scp) on the device or the host system to copy files from or to the device.

To copy the file myapp from the host’s current working directory to the target’s /usr/bin directory, type on the host’s console:

To copy the target’s /usr/bin/myapp file back to the host’s current working directory, type:

Uploading files with SFTP

You can exchange files between the host system and the target system using an SFTP (Secure FTP) client on
the host system. Simply choose your favorite SFTP client (e.g. FileZilla) and connect to sftp://192.168.1.1 with user root and no password.