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	2	+ **Table of** **Contents:**
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	4	+{{toc/}}
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1	1	= 1. Introduction =
2	2
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3	3	This chapter introduces how users can change the uplinkdwell time.
4	4
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5	5	= 2. Default uplinkdwelltime =
6	6
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7	7	Take AS923 frequency band as an example. We can see the spread spectrum factor corresponding to the data rate.
8	8
9		-[[image:https://wiki.dragino.com/images/2/25/Vbn.png||alt="Vbn.png" height="290" width="523"]]
10	10
11		-The device default uplinkdwelltime=1, there are SF7, SF8, SF9 and SF10.
	21	+[[image:image-20220527091341-1.png]]
12	12
13		-If users want to ues SF11 and SF12, they need to set uplinkdwelltime=0.
14	14
	24	+The device default (% style="color:blue" %)**uplinkdwelltime=1**(%%), there are **SF7, SF8, SF9 and SF10**.
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	26	+If users want to ues **SF11 and SF12,** they need to set (% style="color:blue" %)**uplinkdwelltime=0**.
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15	15	Users can use AT commands to set uplinkdwell time.
16	16
17		-[[image:https://wiki.dragino.com/images/thumb/b/bb/Uplinkdwelltime1.png/600px-Uplinkdwelltime1.png||alt="Uplinkdwelltime1.png" height="511" width="600"]]
18	18
19		-[[image:https://wiki.dragino.com/images/thumb/7/78/Uplinkdwelltime2.png/600px-Uplinkdwelltime2.png||alt="Uplinkdwelltime2.png" height="301" width="600"]]
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20	20
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	34	+[[image:image-20220527091503-3.png]]
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21	21	= 3. Use AT command to set uplinkdwell time =
22	22
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23	23	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.
24	24
25		-* Use AT command: AT+DWELLT=0, set to Uplink Dwelltime=0.
26		-* 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.
27	27
	44	+* Use AT command: (% style="color:blue" %)**AT+DWELLT=1**(%%),  set to Uplink Dwelltime=1.
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28	28	Or via application downlink command:
29	29
30		-* Downlink Payload: 0x2500, Set AT+DWELLT=0 to uplink.
31		-* 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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