Could you post a link to the "usb to RJ45 serial cable"?I'm running Raspberry Pi OS Lite Bookworm on Raspberry Pi 3. I've bought a usb to RJ45 serial cable that plugs in the ethernet port to access the Pi without ssh. When I try to access the serial terminal through PuTTY on Windows, it floods the console with white blocks. I switch to minicom on Linux and it responds by flooding error character when I type anything.
I have enabled UART and disabled bluetooth by adding enable_uart=1 and dtoverlay=disable-bt (I also tried dtoverlay=pi3-disable-bt) to config.txt at the boot partition, and enabled the serial interface through raspi-config. But after that it's still not working.
I notice that posts on the forum suggest that there should be a /dev/serial0 and /dev/serial1 as softlinks to the underlying ttyAMA0 and ttyS0. But I only see serial0, ttyAMA0 and ttyS0 present. Also all posts I can find online are about disabling the serial terminal interface and using the serial to connect to other devices.
Is there anything I'm missing? Or should I just get a normal ethernet cable or usb to serial cable instead?
Kernel versionCode:
$ uname -aLinux pie 6.12.96+rpt-rpi-v8 #1 SMP PREEMPT Debian 1:6.12.96-1+rpt1 (2026-07-24) aarch64 GNU/Linux
If it plugs into the Pi's Ethernet port then the serial settings on the Pi will have precisely zero effect. If it plugs into the Windows machine's Ethernet port it will, but it's not clear from your post.
Aside from that, have you matched the baud rate in putty or minicom?
Statistics: Posted by ame — Fri Sep 11, 2026 8:23 pm
