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2		- **Table of** **Contents:**
3		-
4		-{{toc/}}
5		-
6		-
7		-
8		-
9	9	= 1. Introduction =
10	10
11		-
12	12	This chapter introduces how users can change the uplinkdwell time.
13	13
14		-
15	15	= 2. Default uplinkdwelltime =
16	16
17		-
18	18	Take AS923 frequency band as an example. We can see the spread spectrum factor corresponding to the data rate.
19	19
	9	+[[image:https://wiki.dragino.com/images/2/25/Vbn.png||alt="Vbn.png" height="290" width="523"]]
20	20
21		-[[image:image-20220527091341-1.png]]
	11	+The device default uplinkdwelltime=1, there are SF7, SF8, SF9 and SF10.
22	22
	13	+If users want to ues SF11 and SF12, they need to set uplinkdwelltime=0.
23	23
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		-
28	28	Users can use AT commands to set uplinkdwell time.
29	29
	17	+[[image:https://wiki.dragino.com/images/thumb/b/bb/Uplinkdwelltime1.png/600px-Uplinkdwelltime1.png||alt="Uplinkdwelltime1.png" height="511" width="600"]]
30	30
31		-[[image:image-20220527091422-2.png]]
	19	+[[image:https://wiki.dragino.com/images/thumb/7/78/Uplinkdwelltime2.png/600px-Uplinkdwelltime2.png||alt="Uplinkdwelltime2.png" height="301" width="600"]]
32	32
33		-
34		-[[image:image-20220527091503-3.png]]
35		-
36		-
37	37	= 3. Use AT command to set uplinkdwell time =
38	38
39		-
40	40	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.
41	41
42		-* Use AT command: (% style="color:blue" %)**AT+DWELLT=0**(%%),  set to Uplink Dwelltime=0.
	25	+* Use AT command: AT+DWELLT=0, set to Uplink Dwelltime=0.
	26	+* Use AT command: AT+DWELLT=1, set to Uplink Dwelltime=1.
43	43
44		-* Use AT command: (% style="color:blue" %)**AT+DWELLT=1**(%%),  set to Uplink Dwelltime=1.
45		-
46	46	Or via application downlink command:
47	47
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.
	30	+* Downlink Payload: 0x2500, Set AT+DWELLT=0 to uplink.
	31	+* Downlink Payload: 0x2501, Set AT+DWELLT=1 to uplink.

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