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FS#3402 - RUT955: Seriously broken #6573
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dangowrt: RS-232 is connected via USB needs driver and is available on /dev/ttyACM0. What exactly doesn't work? (I'm sitting next to the device and it does work for me) |
tophirsch: RS-232 is working totally fine, just select the correct kmods for usb-serial. RS-485 is causing some trouble, but I managed to find a fix/workaround. First there is this kernel trace at boot and whenever I try to open the serial port with picocom: Commenting the dtr-gpios entry in //target/linux/ath79/dts/ar9344_teltonika_rut955.dts// out, lets the kernel trace disappear and leads to the second problem: the RUT955 is only able to receive data via RS-485, transmission does not work. This issue can be resolved by modifying the pin muxing in //target/linux/ath79/dts/ar9344_teltonika_rut9xx.dtsi//: According to the Teltonike SDK the tx pin is 18, but <0x10 0x4f000000 0xff000000> configures GPIO19 at 0x1804003C. As I'm not that familiar with devicetree, I dont know if commenting out dtr-gpios has no side effects, so be carefull. Device used: Teltonika RUT955 (Batch: 102) |
Any news here ? I have aRUT955, running 22.03.2, and having trouble to get the built-in RS485 to work. I am building my custom images (from source), and I see quite some differences in target/linux/ath79/dts/ar9344_teltonika_rut955.dts compared to above mentioned patch or https://patchwork.ozlabs.org/project/openwrt/patch/20200212143804.GA519559@makrotopia.org/ |
reinerotto:
RS485 and RS232 (DB9) unusable on my recent RUT955, batch 84.
I want to use RS485 (in worst case, RS232) for modbus comms.
However, my custom built image basically works, incl. mqtt, mwan3, LTE (EC25) etc.
The firmware from TELTONIKA runs without problems.
For strange boot log, pls refere to
https://forum.openwrt.org/t/teltonika-rut955-tainted-kernel-ath1/77335/2
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