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	1	+(% class="wikigeneratedid" %)
	2	+**Table of Contents:**
	3	+
	4	+{{toc/}}
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	6	+
1	1	= 1. Introduction =
2	2
	9	+
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
	12	+
5	5	= 2. Not able to send AT Command =
6	6
	15	+
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:
	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**
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		-* 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:
	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:
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"]]
	28	+[[image:image-20220527083416-1.png]]
24	24
25	25	Add a new line in some software
26	26
...	...	@@ -27,6 +27,7 @@
27	27
28	28	= 3. If you still not able to fix this issue =
29	29
	35	+
30	30	please send us below info at support@dragino.com
31	31
32	32	* Screen shot for your serial utility baud rate settings.