Digi TX54, User Manual

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Applications Use Python to access serial ports
TX54 User Guide 718
DeviceInfo
builtins.Exception(builtins.BaseException)
HIDException
builtins.object
Device
...
>>>
5. Use Ctrl-D to exit the Python session. You can also exit the session using exit() or quit() .
Use Python to access serial ports
You can use the Python serial module to access serial ports on your TX54 device that are configured
to be in Application mode. For example, you can configure USB ports to function serial ports and
interact programmatically with those ports. See
Configure Application mode for information about
configuring a serial port in Application mode, and see Add a USB serial port for information about
configuring USB ports on the device to function as serial ports.
To use Python to access serial ports:
1. Log into the TX54 command line as a user with shell access.
Depending on your device configuration, you may be presented with an Access selection
menu . Type shell to access the device shell.
2. Determine the path to the serial port:
# ls /dev/serial/
by-id
by-path by-usb port1 USB_port1 USB_port2
#
3. At the shell prompt, use the python command with no parameters to enter an interactive
Python session:
# python
Python 3.6.13 (default, May
9 2021, 22:49:59)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>
4. Import the serial module:
>>> import serial
>>>
5. You can now perform operations on the serial port. For example, to write a message to the
serial port:
>>> s = serial.Serial("/dev/serial/USB_port1", 115200)
>>> s.write(b"Hello from USB serial port")
26
>>>
6. Use Ctrl-D to exit the Python session. You can also exit the session using exit() or quit() .