Hello,

I want to test the LORA protocol for a while and spoiled myself lately.

I have tested Draguino LORA gateway, but don't really like it, neither the support and will not use it for my current project.

So I bought a REYAX RYLR406 which is a LORA antenna transceiver module and perfect size for my project.

As you can see, there is a receive/transmit pin for UART communication.

I want to use Node-RED for this project.

Do I simply need to use "Serial" node to send the AT command?

I will start my test as soon as I can and will let you know how it went.

Best regards,

HugoD

Hello,

Just to let you know I moved a step further and found the way to configure the module from computer using the "AT command" the manual is referring to.

I used a "USB to 3.3v TTL PIN Header Cable" I bought some years ago and the Arduino IDE.

All I had to do is connect the TX of the cable to the RX of the LORA module, the RX of the cable to the TX of the LORA module, ground and VCC (+3.3V).

You can use a jumper between ground and RST pin to reset the module to default value.

Once the connection were done, I connected the USB to the computer and select the good COM port in Arduino IDE.

Default baud rate of the LORA module is 115200 as you can see in page 9/15 of the manual I joined to the first post.

Finally, all you have to do is test the communication using "AT" command with the following selection.

You get a "satisfying" +OK when everything is good.

I will continue my test in my spare time and tell you how it went when connect to IOT2040!!!

Best regards,

HugoD

Hello,

Here is the parameters I used for my two LORA modules.

Module 1:

• AT+ADDRESS=65000 (this is a unique address you will use to send data between modules)
• AT+NETWORKID=9 (devices must be in the same group called "NetworkId" to communicate between each other)
• AT+BAND=915000000 (This is in function of your permitted local region frequency band)
  • 868 MHz for Europe
  • 915 MHz for North America
  • 433 MHz band for Asia
• AT+PARAMETER=12,3,1,7 (this is for over 3km communication distance)

Best regards,

HugoD

AT+ADDRESS?

AT+NETWORKID?

AT+BAND?

AT+PARAMETER?

Here is the result:

Module 1:

Module 2:

Hello,

Following the below manual, I connected the LORA module to X11 and X13.

SIMATIC IOT2020, SIMATIC IOT2040 (page 49-54-55)

X11 pin 1 (RxD) connect to TXD of LORA Module

X11 pin 2 (TxD) connect to RXD of LORA Module

X13 pin 4 (+3.3V) connect to VDD of LORA Module

X13 pin 6 (GND) connect to GND of LORA Module

I had to go into iot2000setup with PuTTY to "Enable UART0 on Pins D0 & D1".

Next, I create a simple flow into Node-RED I will show in the following post.

Best regards,

HugoD

Hello,

As promise, here is the flow:

Here is the exported clipboard:

[{"id":"a7259f8c.62945","type":"serial in","z":"4f3082c5.60a51c","name":"","serial":"714ecfd3.ee408","x":240,"y":100,"wires":[["391303e.82372fc"]]},{"id":"dc77e8.9da10818","type":"serial out","z":"4f3082c5.60a51c","name":"","serial":"714ecfd3.ee408","x":680,"y":60,"wires":[]},{"id":"391303e.82372fc","type":"debug","z":"4f3082c5.60a51c","name":"","active":true,"console":"false","complete":"false","x":390,"y":100,"wires":[]},{"id":"293546cd.825eea","type":"inject","z":"4f3082c5.60a51c","name":"","topic":"","payload":"AT+ADDRESS?","payloadType":"str","repeat":"","crontab":"","once":false,"x":220,"y":60,"wires":[["92021a6.f23ede8"]]},{"id":"92021a6.f23ede8","type":"function","z":"4f3082c5.60a51c","name":"Add carriage return and line feed","func":"msg.payload = msg.payload+\"\\r\"+\"\\n\"; \nreturn msg;\n//\\r - Carriage Return   0x0D - 13\n//\\n - Line Feed          0x0A  - 10","outputs":1,"noerr":0,"x":460,"y":60,"wires":[["dc77e8.9da10818"]]},{"id":"714ecfd3.ee408","type":"serial-port","z":"","serialport":"/dev/ttyS0","serialbaud":"115200","databits":"8","parity":"none","stopbits":"1","newline":"10","bin":"false","out":"time","addchar":false}]

Here is the result in the debug window:

Best regards,

HugoD