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2		- **Contents:**
	2	+ **Table of** **Contents:**
3	3
4	4	{{toc/}}
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8	8
9	9	= 1. Introduction =
10	10
	11	+
11	11	This chapter introduces how users can change the uplinkdwell time.
12	12
13	13
14	14	= 2. Default uplinkdwelltime =
15	15
	17	+
16	16	Take AS923 frequency band as an example. We can see the spread spectrum factor corresponding to the data rate.
17	17
	20	+
18	18	[[image:image-20220527091341-1.png]]
19	19
20	20
21		-The device default uplinkdwelltime=1, there are SF7, SF8, SF9 and SF10.
	24	+The device default (% style="color:blue" %)**uplinkdwelltime=1**(%%), there are **SF7, SF8, SF9 and SF10**.
22	22
23		-If users want to ues SF11 and SF12, they need to set uplinkdwelltime=0.
	26	+If users want to ues **SF11 and SF12,** they need to set (% style="color:blue" %)**uplinkdwelltime=0**.
24	24
25	25	Users can use AT commands to set uplinkdwell time.
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	30	+
27	27	[[image:image-20220527091422-2.png]]
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29	29
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32	32
33	33	= 3. Use AT command to set uplinkdwell time =
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	39	+
35	35	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.
36	36
37		-* Use AT command: (% style="color:#4f81bd" %)**AT+DWELLT=0**(%%), set to Uplink Dwelltime=0.
38		-* Use AT command: (% style="color:#4f81bd" %)**AT+DWELLT=1**(%%), set to Uplink Dwelltime=1.
	42	+* Use AT command: (% style="color:blue" %)**AT+DWELLT=0**(%%),  set to Uplink Dwelltime=0.
39	39
	44	+* Use AT command: (% style="color:blue" %)**AT+DWELLT=1**(%%),  set to Uplink Dwelltime=1.
	45	+
40	40	Or via application downlink command:
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42		-* Downlink Payload:** (% style="color:#4f81bd" %)0x2500(%%)**, Set AT+DWELLT=0 to uplink.
43		-* Downlink Payload: (% style="color:#4f81bd" %)**0x2501**(%%), Set AT+DWELLT=1 to uplink.
	48	+* Downlink Payload:** (% style="color:blue" %)0x2500(%%)**,  Set AT+DWELLT=0 to uplink.
	49	+
	50	+* Downlink Payload: (% style="color:blue" %)**0x2501**(%%),  Set AT+DWELLT=1 to uplink.