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2		- **Contents:**
	2	+ **Table of** **Contents:**
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4	4	{{toc/}}
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9	9	= 1. Introduction =
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11	11	This chapter introduces how users can change the uplinkdwell time.
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14	14	= 2. Default uplinkdwelltime =
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16	16	Take AS923 frequency band as an example. We can see the spread spectrum factor corresponding to the data rate.
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18	18	[[image:image-20220527091341-1.png]]
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25	25	Users can use AT commands to set uplinkdwell time.
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27	27	[[image:image-20220527091422-2.png]]
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33	33	= 3. Use AT command to set uplinkdwell time =
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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.
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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:#4f81bd" %)**AT+DWELLT=0**(%%),  set to Uplink Dwelltime=0.
	43	+* Use AT command: (% style="color:#4f81bd" %)**AT+DWELLT=1**(%%),  set to Uplink Dwelltime=1.
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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.
	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.