View serial printer output on a Raspberry Pi using Python
View serial printer output on a Raspberry Pi using Python
I don’t recognize the exact pinout or function of each connector on the header. You mentioned you can use the screw terminal label, which helps. Double-check the wiring diagram or consult the device’s manual for a correct configuration. Let me know if you need guidance on interpreting the labels. Thanks!
The TX and RX lines appear correctly crossed, ensuring TX ≠ RX and RX ≠ TX. If flow control is involved, the device should respond to RTS and wait for CTS, so those connections must also be matched. You’ll likely need to exchange the wires at one end. The missing component is the ground connection (5 GND), which should be connected. Other adapter settings like RI, DSR, DTR, and DCD can be left unchanged. In software, enable hardware flow control (RTS/CTS). For your USB serial adapter, test it by connecting it to a Raspberry Pi and checking if /dev/ttyUSBx is created.
I'd keep those configurations unchanged (1200 8N1). For a graphical setup on your Raspberry Pi, installing PuTTY would be straightforward—likely available in the default repos. You can configure it for a serial connection on /dev/ttyUSB0 using the settings from your screenshot and enable hardware flow control. If that doesn't work, consider using the minicom command-line tool, which might simplify the process compared to trying to get the screen to function.
I'll try again soon—corrupted package installs forced the reinstall. I'll update you once I've tested minicom; I'm running on a 1GB system and don't want it to strain the desktop.
Hi @Alfihar, I changed to using the screw terminals. The RS232 indicator on the alarm board lit up! When I asked it to print, it confirmed it was working. In the second update, I connected via cat /dev/ttyUSB0, but no output to the minicom. In the third update, trying cat < /dev/ttyUSB0 showed a file—possibly an issue with baud rate or format.
Adjust the command line parameters as requested. Use setting A as /dev/ttyUSB0 and E as 1200 8N1. Then attempt to activate the alarm system again. For viewing output with cat, modify the port settings via stty. Minicom remains the simpler choice.
Noted your recent post update. It's a positive sign, just ensure the configurations are accurate. Since the cat appears active, you might want to test: stty -F /dev/ttyUSB0 1200. You can also use stty -F /dev/ttyUSB0 -a. After adjusting, try running cat again.