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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
	14	+
10	10	= 2. Default uplinkdwelltime =
11	11
	17	+
12	12	Take AS923 frequency band as an example. We can see the spread spectrum factor corresponding to the data rate.
13	13
14		-[[image:https://wiki.dragino.com/images/2/25/Vbn.png||alt="Vbn.png" height="290" width="523"]]
15	15
16		-The device default uplinkdwelltime=1, there are SF7, SF8, SF9 and SF10.
	21	+[[image:image-20220527091341-1.png]]
17	17
18		-If users want to ues SF11 and SF12, they need to set uplinkdwelltime=0.
19	19
	24	+The device default (% style="color:blue" %)**uplinkdwelltime=1**(%%), there are **SF7, SF8, SF9 and SF10**.
	25	+
	26	+If users want to ues **SF11 and SF12,** they need to set (% style="color:blue" %)**uplinkdwelltime=0**.
	27	+
20	20	Users can use AT commands to set uplinkdwell time.
21	21
22		-[[image:https://wiki.dragino.com/images/thumb/b/bb/Uplinkdwelltime1.png/600px-Uplinkdwelltime1.png||alt="Uplinkdwelltime1.png" height="511" width="600"]]
23	23
24		-[[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]]
25	25
	33	+
	34	+[[image:image-20220527091503-3.png]]
	35	+
	36	+
26	26	= 3. Use AT command to set uplinkdwell time =
27	27
	39	+
28	28	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.
29	29
30		-* Use AT command: AT+DWELLT=0, set to Uplink Dwelltime=0.
31		-* 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.
32	32
	44	+* Use AT command: (% style="color:blue" %)**AT+DWELLT=1**(%%),  set to Uplink Dwelltime=1.
	45	+
33	33	Or via application downlink command:
34	34
35		-* Downlink Payload: 0x2500, Set AT+DWELLT=0 to uplink.
36		-* 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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