REYAX RYLR890 LoRa transmitter test

published: 8 October 2020 / updated 8 October 2020

Required test environment

To test and configure the LoRa REYAX RYLR890 transmission module, you must have a USB / RS232 adapter:
The TTL/serial converter CP2102.

You also need a terminal program, Tera Term for example:
Install and use the Tera Term terminal

RYLR890 transmitter connection diagram to the CP210 USB / RSR232 converter:

In this view, the RYLR890 transmitter is seen from the front, antenna on the right (not shown on the diagram).

CAUTION: the RYLR890 transmitter must imperatively be supplied with 3.3 volts.

Here is the photo of the final connection between the CP210 converter and the RYLR890 transmitter:

Click on Configuration and select Terminal:

For the transmit, select CR+LF

Validate this setting by clicking on OK.

Click on Configuation and select serial link:

Select the serial baud rate to 115200.

Validate this setting by clicking on OK.

Connect the CP2102 to a USB output on your PC.

Start a connection by clicking on File and select New connection.

To use the link between Tera Term and the RYLR890 transmitter, click on Control and select Broadcast Command:

You must have two windows, one for the transmission display with the RYLR890 transmitter, the other window to transmit AT commands:

Here, in the Broadcast Command window, type the AT command, the result is displayed in the main window of the Tera Term terminal.