Internal RS-232 enable

Here list the method to enable internal RS-232 pin header

*Only for Jemii-150D-PoE and Jemii-150A-PoE

Jemii-150 Series use Device-Tree Overlay to enable internal RS-232 function

1KB

RS-232_enable.dts

Open

After download the RS-232 dts file, please follow below instructions to enable function

# go to the same folder with RS-232.dts
# compile dts file to dtbo

INPUT_DTS=RS-232_enable.dts
OUTPUT_DTBO=RS-232_enable.dtbo
dtc -I dts -O dtb -@ -o $OUTPUT_DTBO $INPUT_DTS

# put the dtbo file to /boot/ folder

sudo cp ./RS-232_enable.dtbo /boot/

And then, please manually adjust the extlinux.conf to enable device-tree overlay

sudo gedit /boot/extlinux/extlinux.conf

Please add FDT to connect to the device-tree conf you are using

As for the dtb file, you can check the file by checking the kernel dtb file. They should be aligned.

And then add OVERLAYS to connect to /boot/RS-232.dtbo

After you reboot Jemii-150, the internal RS-232 would be enabled

sudo reboot

# you can check UART status: cat /proc/device-tree/bus@0/serial@3110000/status
# should be: okay