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2		- **Contents:**
	2	+ **Table of** **Contents:**
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4	4	{{toc/}}
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6	6	= 1. Introduction =
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8	8	This chapter introduces how users can change the uplinkdwell time.
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10	10
11	11	= 2. Default uplinkdwelltime =
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13	13	Take AS923 frequency band as an example. We can see the spread spectrum factor corresponding to the data rate.
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15	15	[[image:image-20220527091341-1.png]]
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17	17	The device default uplinkdwelltime=1, there are SF7, SF8, SF9 and SF10.
18	18
19	19	If users want to ues SF11 and SF12, they need to set uplinkdwelltime=0.
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20	20
21	21	Users can use AT commands to set uplinkdwell time.
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23	23	[[image:image-20220527091422-2.png]]
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29	29	= 3. Use AT command to set uplinkdwell time =
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31	31	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.
32	32
33		-* Use AT command: AT+DWELLT=0, set to Uplink Dwelltime=0.
34		-* Use AT command: 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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36	36	Or via application downlink command:
37	37
38		-* Downlink Payload: 0x2500, Set AT+DWELLT=0 to uplink.
39		-* Downlink Payload: 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.