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1	1	= 1. Introduction =
2	2
	3	+
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
5	5
6	6	= 2. Not able to send AT Command =
7	7
	9	+
8	8	* Do you use a USB to TTL Converter? If you use RS232 converter, it won't work
9	9	* Can you see the output from console.
10	10	* 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**
11	11
12		-(% class="box" %)
13		-(((
14		-~** Baudrate: 9600
15		-~** Data bits: 8
16		-~** Stop bits: 1
17		-~** Parity: None
18		-~** Flow control: None
19		-)))
20		-
21	21	* Did you have the hardware RXD pin connected correctly according to the user manual?
22	22	* 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:
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28	28
29	29	= 3. If you still not able to fix this issue =
30	30
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31	31	please send us below info at support@dragino.com
32	32
33	33	* Screen shot for your serial utility baud rate settings.