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