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1	1	= 1. Introduction =
2	2
3		-
4	4	This chapter describe the checklist for not able to access to AT Command in Dragino LoRaWAN End Node base on STM32 chip.
5	5
6		-
7	7	= 2. Not able to send AT Command =
8	8
9		-
10	10	* Do you use a USB to TTL Converter? If you use RS232 converter, it won't work
11	11	* Can you see the output from console.
12	12	* Do you use the correct baudrate:
13		-** (% style="color:blue" %)**Baudrate: 9600**
14		-** (% style="color:blue" %)**Data bits: 8**
15		-** (% style="color:blue" %)**Stop bits: 1**
16		-** (% style="color:blue" %)**Parity: None**
17		-** (% style="color:blue" %)**Flow control: None**
18	18
	11	+(% class="box" %)
	12	+(((
	13	+~** Baudrate: 9600
	14	+~** Data bits: 8
	15	+~** Stop bits: 1
	16	+~** Parity: None
	17	+~** Flow control: None
	18	+)))
	19	+
19	19	* Did you have the hardware RXD pin connected correctly according to the user manual?
20	20	* 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:
21	21
22		-[[image:image-20220527083416-1.png]]
	23	+[[image:https://wiki.dragino.com/images/thumb/5/5c/UART_access_1.png/600px-UART_access_1.png||height="419" width="600"]]
23	23
24	24	Add a new line in some software
25	25
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26	26
27	27	= 3. If you still not able to fix this issue =
28	28
29		-
30	30	please send us below info at support@dragino.com
31	31
32	32	* Screen shot for your serial utility baud rate settings.

image-20220527083416-1.png

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1		-XWiki.Xiaoling

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