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1		-(% class="wikigeneratedid" %)
2		-**Table of Contents:**
3		-
4		-{{toc/}}
5		-
6		-
7	7	= 1. Introduction =
8	8
9		-
10	10	This chapter describe the checklist for not able to access to AT Command in Dragino LoRaWAN End Node base on STM32 chip.
11	11
12		-
13	13	= 2. Not able to send AT Command =
14	14
15		-
16	16	* Do you use a USB to TTL Converter? If you use RS232 converter, it won't work
17	17	* Can you see the output from console.
18	18	* Do you use the correct baudrate:
19		-** (% style="color:blue" %)**Baudrate: 9600**
20		-** (% style="color:blue" %)**Data bits: 8**
21		-** (% style="color:blue" %)**Stop bits: 1**
22		-** (% style="color:blue" %)**Parity: None**
23		-** (% style="color:blue" %)**Flow control: None**
24	24
	11	+(% class="box" %)
	12	+(((
	13	+~** Baudrate: 9600
	14	+~** Data bits: 8
	15	+~** Stop bits: 1
	16	+~** Parity: None
	17	+~** Flow control: None
	18	+)))
	19	+
25	25	* Did you have the hardware RXD pin connected correctly according to the user manual?
26		-* Did you add the (% style="color:blue" %)**ENTER**(%%) and (% style="color:blue" %)**NEW LINE**(%%) after press send. Some serial utility doesn't add them by default. Below is an example for adding new line:
	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:
27	27
28		-[[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"]]
29	29
30	30	Add a new line in some software
31	31
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32	32
33	33	= 3. If you still not able to fix this issue =
34	34
35		-
36	36	please send us below info at support@dragino.com
37	37
38	38	* Screen shot for your serial utility baud rate settings.