1. Introduction

This chapter describe the checklist for not able to access to AT Command in Dragino LoRaWAN End Node base on STM32 chip.

2. Not able to send AT Command

• Do you use a USB to TTL Converter? If you use RS232 converter, it won't work
• Can you see the output from console.
• Do you use the correct baudrate:

** Baudrate: 9600 
** Data bits: 8
** Stop bits: 1
** Parity: None
** Flow control: None

• Did you have the hardware RXD pin connected correctly according to the user manual?
• Did you add the ENTER and NEW LINE after press send. Some serial utility doesn't add them by default. Below is an example for adding new line:

Add a new line in some software

3. If you still not able to fix this issue

please send us below info at support@dragino.com

• Screen shot for your serial utility baud rate settings.
• Screen shot of your serial console.
• A photo shows clearly how you use USB-TTL adapter connect to the device.