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Last modified by Xiaoling on 2024/08/16 11:25
From version 19.2
edited by Xiaoling
on 2022/12/29 17:40
Change comment: There is no comment for this version
To version 24.1
edited by Xiaoling
on 2024/08/16 11:25
Change comment: There is no comment for this version

Summary

Details

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Content
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4 4  
5 5  
6 6  
7 +
8 +
7 7  = 1.  OverView =
8 8  
9 9  
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35 35  
36 36  **End node actually value when TXP=0 and DR=0**
37 37  
38 -(% border="1.5" cellspacing="4" style="background-color:#ffffcc; color:black; width:1002px" %)
39 -|(% style="width:134px" %)**Frequency band**|(% style="width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="width:362px" %)(((
40 +(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:1002px" %)
41 +|(% style="background-color:#4f81bd; color:white; width:134px" %)**Frequency band**|(% style="background-color:#4f81bd; color:white; width:400px" %)**Output Power in LoRa Module (consider 2dB antenna)**|(% style="background-color:#4f81bd; color:white; width:362px" %)(((
40 40  **Spreading Factor(Higher SF can transmit further)**
41 -)))|(% style="width:102px" %)**Band Width**
43 +)))|(% style="background-color:#4f81bd; color:white; width:102px" %)**Band Width**
42 42  |(% style="width:134px" %)**EU868**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz
43 43  |(% style="width:134px" %)**US915**|(% style="width:400px" %)20 or 22 dBm (depends on max output of module)|(% style="width:362px" %)SF=10|(% style="width:102px" %)125Khz
44 44  |(% style="width:134px" %)**AS923**|(% style="width:400px" %)14dBm|(% style="width:362px" %)SF=12|(% style="width:102px" %)125Khz
45 45  
46 -
47 -
48 48  == 2.2  Adaptive Data Rate (ADR) and set max distance ==
49 49  
50 50  
51 -**ADR** is the feature that Server will ask End Node to adjust the TXP and DR according to some rules in the server. This is for the purpose of Network Management and Optimize End Node battery life-time.
51 +(% style="color:#037691" %)**ADR**(%%) is the feature that Server will ask End Node to adjust the TXP and DR according to some rules in the server. This is for the purpose of Network Management and Optimize End Node battery life-time.
52 52  
53 53  
54 54  By default, ADR is turn on((% style="color:#037691" %)**AT+ADR=1**) (%%)so End node ADR feature is enable.
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58 58  
59 59  (% style="color:#037691" %)**AT+ADR=0**
60 60  
61 -(% style="color:#037691" %)**AT+DR=0**
61 +(% style="color:#037691" %)**AT+DR=0     **~/~/(%%) Use longest distance modulation
62 62  
63 -(% style="color:#037691" %)**AT+TXP=0**
63 +(% style="color:#037691" %)**AT+TXP=0   **(%%)~/~/ Use max power   For EU868, max power can be is AT+TXP=50
64 64  
65 65  
66 66  This can be downlink via the LoRaWAN downlink command, see [[this link>>url:http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/#H8.2UseDownlinkCommandtosetafixuplinkDR]] for reference.
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71 71  
72 72  According to the above technology, if we have a problem on the distance, we can first check if the end node is trying to longest distance modulation already. We can see that from the LoRaWAN server. Below is an example from Chirpstack.
73 73  
74 -
75 75  We can see the traffic in gateway's page and know that the distance is SF12 / BW125. (note, server is not able to know Transmit Power settings from End Node)
76 76  
77 -
78 78  [[image:image-20221006185826-3.png]]
79 79  
80 80  
... ... @@ -83,15 +83,25 @@
83 83  
84 84  Below are the settings for longest distance transmission. ( will reduce battery life)
85 85  
86 -* (% style="color:#037691" %)**AT+ADR=0**     (%%)~/~/  Disable ADR
87 -* (% style="color:#037691" %)**AT+DR=  0**     (%%)~/~/  Use the smallest DR
88 -* (% style="color:#037691" %)**AT+TXP=0**    (%%) ~/~/  Use max power.
84 +* (% style="color:#037691" %)**AT+ADR=0**          (%%)~/~/  Disable ADR  (% style="color:#037691" %)**(downlinkpayload: 2200FFFF)**
85 +* (% style="color:#037691" %)**AT+DR=0**           (%%)~/~/  Use the smallest DR,the longest distance modulation (% style="color:#037691" %)**(downlinkpayload: 220000FF)**
86 +* (% style="color:#037691" %)**AT+TXP=0**          (%%)~/~/  Use max power   For EU868, max power can be is AT+TXP=50 (% style="color:#037691" %)** (downlinkpayload: 22000000)**
89 89  
90 90  
91 91  
90 +== 2.5 Debug in Software ==
91 +
92 +
93 +Dragino can help client to debug the software for the distance issue. In the case , please send us below info:
94 +
95 +* Detail packets include for Join Request, Join Accept, Uplink & Downlink, These packets should include:
96 +** RSSI, DataRate, FCNT, Frequency.
97 +** MIC command detail & Payload detail.
98 +
99 +
92 92  = 3.  Analyze at the hardware side =
93 93  
94 -== 3.1  Check if the antenna path is good ~-~- For LSn50v2 series end node ==
102 +== 3.1  Check if the antenna path is good ~-~- For LSN50v2 series end node ==
95 95  
96 96  
97 97  a) Open Enclosure and Check if the antenna connection to module is good.
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98 98  
99 99  b) check if the connector match.
100 100  
101 -
102 102  [[image:image-20221016081725-1.png||height="426" width="706"]]
103 103  
104 104  
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141 141  
142 142  Below is the output log in gateway side ( SSH Access to Gateway and Check Station log)
143 143  
144 -
145 145  [[image:image-20221006185826-4.png]]
146 146  
147 147  
... ... @@ -170,6 +170,11 @@
170 170  [[image:image-20221101000006-1.png||height="353" width="931"]]
171 171  
172 172  
179 += 6. Use a repeater =
173 173  
174 174  
182 +In some cases, user can consider use a repeater for limitation transmition.
183 +
184 +See here for how to set up: [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20All%20Gateway%20models/LoRaWAN%20IoT%20Kit%20v3%20User%20Manual/#H7.Example6:LimitedLoRaWANrelay >>http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20All%20Gateway%20models/LoRaWAN%20IoT%20Kit%20v3%20User%20Manual/#H7.Example6:LimitedLoRaWANrelay]]
185 +
175 175