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8	8	This chapter introduces how users can change the uplinkdwell time.
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10	10	= 2. Default uplinkdwelltime =
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12	12	Take AS923 frequency band as an example. We can see the spread spectrum factor corresponding to the data rate.
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14		-[[image:https://wiki.dragino.com/images/2/25/Vbn.png||alt="Vbn.png" height="290" width="523"]]
	15	+[[image:image-20220527091341-1.png]]
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16	16	The device default uplinkdwelltime=1, there are SF7, SF8, SF9 and SF10.
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20	20	Users can use AT commands to set uplinkdwell time.
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22		-[[image:https://wiki.dragino.com/images/thumb/b/bb/Uplinkdwelltime1.png/600px-Uplinkdwelltime1.png||alt="Uplinkdwelltime1.png" height="511" width="600"]]
	23	+[[image:image-20220527091422-2.png]]
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24		-[[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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	26	+[[image:image-20220527091503-3.png]]
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26	26	= 3. Use AT command to set uplinkdwell time =
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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.
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30		-* Use AT command: AT+DWELLT=0, set to Uplink Dwelltime=0.
31		-* Use AT command: AT+DWELLT=1, set to Uplink Dwelltime=1.
	33	+* Use AT command: (% style="color:#4f81bd" %)**AT+DWELLT=0**(%%), set to Uplink Dwelltime=0.
	34	+* Use AT command: (% style="color:#4f81bd" %)**AT+DWELLT=1**(%%), set to Uplink Dwelltime=1.
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33	33	Or via application downlink command:
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35		-* Downlink Payload: 0x2500, Set AT+DWELLT=0 to uplink.
36		-* Downlink Payload: 0x2501, Set AT+DWELLT=1 to uplink.
	38	+* Downlink Payload:** (% style="color:#4f81bd" %)0x2500(%%)**, Set AT+DWELLT=0 to uplink.
	39	+* Downlink Payload: (% style="color:#4f81bd" %)**0x2501**(%%), Set AT+DWELLT=1 to uplink.

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