April 2018
Beginner
552 pages
13h 58m
English
Once you have connected the USB-to-RS232 device to Raspberry Pi, check to see whether a new serial device is listed by typing the following command:
dmesg | grep tty
The dmesg command lists events that occur on the system; using grep, we can filter any messages that mention tty, as shown in the following code:
[ 2409.195407] usb 1-1.2: pl2303 converter now attached to ttyUSB0
This shows that a PL2303-based USB-RS232 device was attached (2,409 seconds after startup) and allocated the ttyUSB0 identity. You will see that a new serial device has been added within the /dev/ directory (usually /dev/ttyUSB0 or something similar).
If the device has not been detected, you can try steps similar to ...