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2		- **Contents:**
	2	+ **Table of** **Contents:**
3	3
4	4	{{toc/}}
5	5
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	7	+
	8	+
6	6	= 1. Introduction =
7	7
	11	+
8	8	This chapter introduces how users can change the uplinkdwell time.
9	9
10	10
11	11	= 2. Default uplinkdwelltime =
12	12
	17	+
13	13	Take AS923 frequency band as an example. We can see the spread spectrum factor corresponding to the data rate.
14	14
	20	+
15	15	[[image:image-20220527091341-1.png]]
16	16
17		-The device default uplinkdwelltime=1, there are SF7, SF8, SF9 and SF10.
18	18
19		-If users want to ues SF11 and SF12, they need to set uplinkdwelltime=0.
	24	+The device default (% style="color:blue" %)**uplinkdwelltime=1**(%%), there are **SF7, SF8, SF9 and SF10**.
20	20
	26	+If users want to ues **SF11 and SF12,** they need to set (% style="color:blue" %)**uplinkdwelltime=0**.
	27	+
21	21	Users can use AT commands to set uplinkdwell time.
22	22
23		-[[image:https://wiki.dragino.com/images/thumb/b/bb/Uplinkdwelltime1.png/600px-Uplinkdwelltime1.png||alt="Uplinkdwelltime1.png" height="511" width="600"]]
24	24
25		-[[image:https://wiki.dragino.com/images/thumb/7/78/Uplinkdwelltime2.png/600px-Uplinkdwelltime2.png||alt="Uplinkdwelltime2.png" height="301" width="600"]]
	31	+[[image:image-20220527091422-2.png]]
26	26
	33	+
	34	+[[image:image-20220527091503-3.png]]
	35	+
	36	+
27	27	= 3. Use AT command to set uplinkdwell time =
28	28
	39	+
29	29	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.
30	30
31		-* Use AT command: AT+DWELLT=0, set to Uplink Dwelltime=0.
32		-* Use AT command: AT+DWELLT=1, set to Uplink Dwelltime=1.
	42	+* Use AT command: (% style="color:blue" %)**AT+DWELLT=0**(%%),  set to Uplink Dwelltime=0.
33	33
	44	+* Use AT command: (% style="color:blue" %)**AT+DWELLT=1**(%%),  set to Uplink Dwelltime=1.
	45	+
34	34	Or via application downlink command:
35	35
36		-* Downlink Payload: 0x2500, Set AT+DWELLT=0 to uplink.
37		-* Downlink Payload: 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.

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