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Can a RS232 be used to send data?
I have two RS232 to USB cables, and I am testing out my code by using one to send data, and the other to receive it. I have them both physically connected to each other. So I wrote some code adapted from a few sources, and I can successfully transfer a series of characters. One program receives the data, the other sends it.
How to write to serial port from Linux command line?
Instead use which you can construct on the command line by typing Ctrl V Ctrl R and Ctrl V Ctrl B. Or it is easier to use an editor to type into a script file. The stty command should work, unless another program is interfering. A common culprit is gpsd which looks for GPS devices being plugged in.
How to communicate with devices via a serial port?
As roderigo mentioned, the device file is most probably called ttyUSB0, but ttyS0 is not impossible. In your program you then open this “file”: fd = open (“/dev/ttyUSB0”, O_RDWR) You can use the functions write and read to send and receive characters from your com port. When you’re finished close the port with close (fd)
What does the second port do in serial?
The second is the shell directing the serial port traffic to any app that you like; this particular app then just relays its stdin to its stdout. Thanks for contributing an answer to Unix & Linux Stack Exchange!
How to read and write from Linux to ttyS0?
A more common configuration would be to configure the virtualization software to allow the VM to access the USB side of a USB-serial converter as a whole: then it would appear in the VM as something like /dev/ttyUSB0 instead (depending on the exact type of the serial converter).
How to connect a Raspi zero to a ttyS0?
If you are using a physical serial connection ( /dev/ttyS0 or /dev/ttyAMA0) on the RasPi side, you should have 40-pin connector on the RasPi Zero W soldered in, and something plugged in to pins 8 and 10 of that connector, as far as I understand. You would also have had to use raspi-config to enable the serial port access.