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1	1	(% class="wikigeneratedid" %)
2		- **Table of** **Contents:**
	2	+ **Contents:**
3	3
4	4	{{toc/}}
5	5
6		-
7		-
8		-
9	9	= 1. Introduction =
10	10
11		-
12	12	This chapter introduces how users can change the uplinkdwell time.
13	13
14	14
15	15	= 2. Default uplinkdwelltime =
16	16
17		-
18	18	Take AS923 frequency band as an example. We can see the spread spectrum factor corresponding to the data rate.
19	19
20		-
21	21	[[image:image-20220527091341-1.png]]
22	22
23		-
24	24	The device default uplinkdwelltime=1, there are SF7, SF8, SF9 and SF10.
25	25
26	26	If users want to ues SF11 and SF12, they need to set uplinkdwelltime=0.
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27	27
28	28	Users can use AT commands to set uplinkdwell time.
29	29
30		-
31	31	[[image:image-20220527091422-2.png]]
32	32
33	33
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36	36
37	37	= 3. Use AT command to set uplinkdwell time =
38	38
39		-
40	40	Since Dragino LoRaWAN Stack DR_LWS_005, user is able to set the uplink Dwelltime in AS923 and AU915 manual or use a application side downlink command to set it.
41	41
42		-* Use AT command: (% style="color:#4f81bd" %)**AT+DWELLT=0**(%%),  set to Uplink Dwelltime=0.
43		-* Use AT command: (% style="color:#4f81bd" %)**AT+DWELLT=1**(%%),  set to Uplink Dwelltime=1.
	33	+* Use AT command: (% style="color:#4f81bd" %)**AT+DWELLT=0**(%%), set to Uplink Dwelltime=0.
	34	+* Use AT command: (% style="color:#4f81bd" %)**AT+DWELLT=1**(%%), set to Uplink Dwelltime=1.
44	44
45		-
46		-
47	47	Or via application downlink command:
48	48
49		-* Downlink Payload:** (% style="color:#4f81bd" %)0x2500(%%)**,  Set AT+DWELLT=0 to uplink.
50		-* Downlink Payload: (% style="color:#4f81bd" %)**0x2501**(%%),  Set AT+DWELLT=1 to uplink.
	38	+* Downlink Payload:** (% style="color:#4f81bd" %)0x2500(%%)**, Set AT+DWELLT=0 to uplink.
	39	+* Downlink Payload: (% style="color:#4f81bd" %)**0x2501**(%%), Set AT+DWELLT=1 to uplink.