I have this module mounted on a breakout board bought from AliExpress. I have it connected to a linux pc via a ch341 usb to 3.3v uart converter. I’m using minicom, 115200,8,1,N.
When I apply power I get “Welcome to RAK811”.
When I try to enter AT commands there is no echo and no response from the 811. I have tried adding CR & LF in the minicom options to no avail.
I can even reflash its firmware using the ST flashing tool so that says that my connections are OK.
This should be simple, what am I missing?
Hi, try using linux picocom with local echo and terminate with control chars…
$ picocom -b 115200 --echo /dev/ttyXXXX
…
…
… enter AT commands and terminate each AT command with ctrl-j
…
I have not used RAK811 but have experienced same issue with other modules.
ctrl-m might also work.
maybe a level problem ? the Rx/Tx lines should be 3V3
this a my (unsorted) browserfolder 811 dump 
- https://create.arduino.cc/projecthub/naresh-krish/integrate-node-red-with-rak811-lora-node-using-the-ttn-c4564a
- https://github.com/RAKWireless/RAK811-AT-Command/tree/master/Application%20Notes
- https://github.com/RAKWireless/RAK811-AT-Command/blob/master/Arduino/RAK811/RAK811.h
- https://github.com/RAKWireless/RAK811-AT-Command/tree/master/Arduino/RAK811/examples
- RAK811 Lora Module Connecting to TTN
- https://github.com/RAKWireless/RAK811-AT-Command/blob/master/Software%20Development/RAK811 LoRa AT Command V1.3.pdf
- https://github.com/RAKWireless/RAK811-AT-Command
- https://www.hackster.io/naresh-krish/using-the-rak811-lora-module-with-arduino-a38de8
- https://create.arduino.cc/projecthub/naresh-krish/getting-started-with-the-rak811-lora-node-67f157
- https://www.hackster.io/naresh-krish/using-the-rak-811-lora-node-with-android-things-13f7df
Despite telling minicom to add crlf it didn’t make the difference. I hacked up a perl script to make sure crlf was sent. It answers now. Thanks for the links.
difference between 811 and 811-N series
first I updated my rak811-N with firmware V2022
info and tool> http://www.rakwireless.com/en/download/RAK811-N/Firmware%20upgrade
that went smooth, just be carefull you select the right bin file
after updating connected to usb-serial sending some AT commands
to make testing (behaviour) more easy I’m programming 'function buttons and writing some testscripts
the results can be used to write an arduino sketch , or other mcu, later to control this module
