Version 221.2 by Xiaoling on 2022/07/01 17:49
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8 (% _msthash="315238" _msttexthash="18964465" _mstvisible="3" %)**Table of Contents：**
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10 {{toc/}}
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18
19 = 1.  Introduction =
20
21
22 == 1.1  What is LHT52 Temperature & Humidity Sensor ==
23
24
25 (((
26 The Dragino LHT52 Temperature & Humidity sensor is a Long Range LoRaWAN Sensor. It includes a (% style="color:blue" %)**built-in Temperature & Humidity sensor** (%%)and has a USB Type-C sensor connector to connect to external sensors such as external Temperature Sensor.
27 )))
28
29 (((
30 LHT52 (% style="color:blue" %)**senses environment temperature and humidity**(%%) and send these values via long-range wireless LoRaWAN protocol. It targets professional wireless sensor network applications such as food service, smart metering, smart cities, building automation, and so on.
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32
33 (((
34 LHT52 supports(% style="color:blue" %)** 2 x AAA batteries **(%%)and works for a long time up to several years. Use can replace the batteries easily after they are finished.
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36
37 (((
38 LHT52 is fully compatible with LoRaWAN v1.0.3 protocol, it can work with standard LoRaWAN gateway.
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40
41 (((
42 LHT52 supports(% style="color:blue" %)** Datalog feature** (%%)to make sure users won't miss sensor data. It records sensor value for every uplink. These values can be retrieved by LoRaWAN server via downlink command.
43 )))
44
45 (((
46 LHT52 supports(% style="color:blue" %)** temperature alarm feature**(%%). It can uplink alarm in a short interval while temperature exceeds preset limits.
47 )))
48
49 (((
50 *Battery life depends how often to send data, please see [[battery analyzer>>||anchor="H4.2A0PowerConsumptionAnalyze"]].
51 )))
52
53 [[image:1655774519494-861.png]]
54
55
56 == 1.2  Features ==
57
58 * Wall Attachable.
59 * LoRaWAN v1.0.3 Class A protocol.
60 * Built-in Temperature & Humidity sensor
61 * Optional External Probe
62 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915
63 * AT Commands to change parameters
64 * Remote configure parameters via LoRaWAN Downlink
65 * Firmware upgradable via program port
66 * Support 2 x AAA LR03 batteries.
67 * Datalog feature
68 * IP Rating: IP52
69
70
71 == 1.3  Specification ==
72
73
74 **Built-in Temperature Sensor:**
75
76 * Resolution: 0.01 °C
77 * Accuracy Tolerance: Typ ±0.3 °C
78 * Long Term Drift: < 0.02 °C/yr
79 * Operating Range: -20 ~~ 50 °C
80
81 **Built-in Humidity Sensor:**
82
83 * Resolution: 0.1 %RH
84 * Accuracy Tolerance: Typ ±3 %RH
85 * Long Term Drift: < 0.02 °C/yr
86 * Operating Range: 0 ~~ 99.0 %RH(no Dew)
87
88
89 == 1.4  Power Consumption ==
90
91 LHT52 (without external sensor): Idle: 5uA, Transmit: max 110mA
92
93 LHT52 + External Temperature Probe (AS-01): Idle: 6uA, Transmit: max 110mA.
94
95
96
97 == 1.5  Storage & Operation Temperature ==
98
99 -20°C to +50°C
100
101
102
103 == 1.6  Applications ==
104
105 * Smart Buildings & Home Automation
106 * Logistics and Supply Chain Management
107 * Smart Metering
108 * Smart Agriculture
109 * Smart Cities
110 * Smart Factory
111
112
113 = 2.  Operation Mode =
114
115 == 2.1  How it work? ==
116
117 Each LHT52 is shipped with a worldwide unique set of LoRaWAN OTAA keys. To use LHT52 in a LoRaWAN network, user needs to input the OTAA keys in LoRaWAN network server. After this, if LHT52 is under this LoRaWAN network coverage, LHT52 can join the LoRaWAN network and start to transmit sensor data. The default period for each uplink is** 20 minutes**.
118
119
120 == 2.2  How to Activate LHT52? ==
121
122 (% style="color:red" %)** 1.  Open enclosure from below position.**
123
124 [[image:image-20220621093835-1.png]]
125
126
127 (% style="color:red" %)** 2.  Insert 2 x AAA LR03 batteries.**
128
129 [[image:image-20220621093835-2.png]]
130
131
132 (% style="color:red" %)** 3.  Press the reset button to activate device.**
133
134 [[image:image-20220621093835-3.png]]
135
136
137 User can check [[LED Status>>||anchor="H2.8LEDIndicator"]] to know the working state of LHT52.
138
139
140
141 == 2.3  Example to join LoRaWAN network ==
142
143 This section shows an example for how to join the [[TheThingsNetwork>>url:https://www.thethingsnetwork.org/]] LoRaWAN IoT server. Usages with other LoRaWAN IoT servers are of similar procedure.
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145 (% _mstvisible="1" class="wikigeneratedid" %)
146 [[image:1655775912928-657.png]]
147
148 Assume the DLOS8 is already set to connect to [[TTN V3 network >>url:https://eu1.cloud.thethings.network/]]. We need to add the LHT52 device in TTN V3 portal. 
149
150
151 (% style="color:blue" %)**Step 1**(%%):  Create a device in TTN V3 with the OTAA keys from LHT52.
152
153 Each LHT52 is shipped with a sticker with the default DEV EUI as below:
154
155
156 [[image:image-20220617150003-1.jpeg]]
157
158
159 Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
160
161 Add APP EUI in the application.
162
163 choose to create the device manually.
164
165 Add APP KEY and DEV EUI
166
167
168 [[image:image-20220522232916-3.png||_mstalt="430495" _mstvisible="3"]]
169
170 [[image:1655776122894-257.png]]
171
172
173
174 **Default mode OTAA**
175
176
177 [[image:1655776241177-240.png]]
178
179
180
181 (% style="color:blue" %)**Step 2**(%%):  Use ACT button to activate LHT52 and it will auto join to the TTN V3 network. After join success, it will start to upload sensor data to TTN V3 and user can see in the panel.
182
183 [[image:image-20220621095134-4.png]]
184
185
186
187 == 2.4  Uplink Payload ==
188
189 Uplink payloads include two types: Valid Sensor Value and other status / control command.
190
191 * Valid Sensor Value: Use FPORT=2
192 * Other control command: Use FPORT other than 2.
193
194
195 === 2.4.1  Uplink FPORT~=5, Device Status ===
196
197 Uplink the device configures with FPORT=5. Once LHT52 Joined the network, it will uplink this message to the server. After first uplink, LHT52 will uplink Device Status every 12 hours.
198
199 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:462px" %)
200 |=(% style="width: 99px;" %)**Size (bytes)**|=(% style="width: 62px;" %)**1**|=(% style="width: 80px;" %)**2**|=(% style="width: 82px;" %)**1**|=(% style="width: 85px;" %)**1**|=(% style="width: 46px;" %)**2**
201 |(% style="width:99px" %)**Value**|(% style="width:62px" %)Sensor Model|(% style="width:80px" %)Firmware Version|(% style="width:82px" %)Frequency Band|(% style="width:85px" %)Sub-band|(% style="width:46px" %)BAT
202
203 [[image:image-20220621100550-5.png]]
204
205 Example Payload (FPort=5):  [[image:image-20220621105116-11.png]]
206
207
208 (% style="color:#4472c4" %)**Sensor Model**(%%): For LHT52, this value is 0x09.
209
210 (% style="color:#4472c4" %)**Firmware Version**(%%): 0x0100, Means: v1.0.0 version.
211
212 (% style="color:#4472c4" %)**Frequency Band**:
213
214 *0x01: EU868
215
216 *0x02: US915
217
218 *0x03: IN865
219
220 *0x04: AU915
221
222 *0x05: KZ865
223
224 *0x06: RU864
225
226 *0x07: AS923
227
228 *0x08: AS923-1
229
230 *0x09: AS923-2
231
232 *0x0a: AS923-3
233
234
235 (% style="color:#4472c4" %)**Sub-Band**(%%): value 0x00 ~~ 0x08(only for CN470, AU915,US915. Others are0x00)
236
237 (% style="color:#4472c4" %)**BAT**(%%): shows the battery voltage for LHT52.
238
239 Ex1: 0x0B3A = 2874mV
240
241
242 Use can also get the Device Status uplink through the downlink command:
243
244 (% style="color:#4472c4" %)**Downlink:  0x2301**
245
246
247 [[image:image-20220621100550-6.png||height="504" width="1491"]]
248
249
250
251 === 2.4.2  Uplink FPORT~=2, Real time sensor value ===
252
253 LHT52 will send this uplink after Device Status uplink once join LoRaWAN network successfully. And it will periodically send this uplink. Default interval is 20 minutes and [[can be changed>>||anchor="H3.1A0DownlinkCommandSet"]].
254
255 Uplink uses FPORT=2 and every 20 minutes send one uplink by default.
256
257 (% _mstvisible="1" border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:426px" %)
258 (% _mstvisible="3" %)|=(% _mstvisible="4" style="width: 97px;" %)(% _mstvisible="5" %)
259 (((
260 (% _mstvisible="6" %)
261 (% _msthash="1817478" _msttexthash="161122" _mstvisible="8" %)**Size(bytes)**
262 )))|=(% _mstvisible="4" style="width: 39px;" %)(% _mstvisible="5" %)
263 (((
264 (% _mstvisible="6" %)
265 (% _msthash="1817479" _msttexthash="4550" _mstvisible="8" %)**2**
266 )))|=(% _mstvisible="4" style="width: 100px;" %)(% _mstvisible="5" %)
267 (((
268 (% _mstvisible="6" %)
269 (% _msthash="1817480" _msttexthash="4550" _mstvisible="8" %)**2**
270 )))|=(% _mstvisible="4" style="width: 77px;" %)(% _mstvisible="5" %)
271 (((
272 (% _mstvisible="6" %)
273 (% _msthash="1817481" _msttexthash="4550" _mstvisible="8" %)**2**
274 )))|=(% _mstvisible="4" style="width: 47px;" %)(% _mstvisible="5" %)
275 (((
276 (% _mstvisible="6" %)
277 (% _msthash="1817482" _msttexthash="4459" _mstvisible="8" %)**1**
278 )))|=(% _mstvisible="4" style="width: 51px;" %)(% _mstvisible="5" %)
279 (((
280 (% _mstvisible="6" %)
281 (% _msthash="1817483" _msttexthash="4732" _mstvisible="8" %)**4**
282 )))
283 (% _mstvisible="3" %)|(% _mstvisible="4" style="width:97px" %)(% _mstvisible="5" %)
284 (((
285 (% _mstvisible="6" %)
286 (% _msthash="1817484" _msttexthash="60203" _mstvisible="8" %)**Value**
287 )))|(% _mstvisible="4" style="width:39px" %)(% _mstvisible="5" %)
288 (((
289 (% _mstvisible="6" %)
290 [[Temperature>>||anchor="HTemperature26ExternalTemperature:" _msthash="2224742" _msttexthash="405769" _mstvisible="8"]]
291 )))|(% _mstvisible="4" style="width:100px" %)(% _mstvisible="5" %)
292 (((
293 (% _mstvisible="6" %)
294 (((
295 (% _mstvisible="7" %)
296 [[Humidity>>||anchor="HHumidity:" _msthash="2224744" _msttexthash="117429" _mstvisible="8"]]
297
298 (% _mstvisible="7" %)
299
300 )))
301 )))|(% _mstvisible="4" style="width:77px" %)(% _mstvisible="5" %)
302 (((
303 (% _mstvisible="6" %)
304 (((
305 (% _mstvisible="7" %)
306 [[External Temperature>>||anchor="HTemperature26ExternalTemperature:" _msthash="2224742" _msttexthash="405769" _mstvisible="8"]]
307 )))
308 )))|(% _mstvisible="4" style="width:47px" %)(% _mstvisible="5" %)
309 (((
310 (% _mstvisible="6" %)
311 [[Ext>>||anchor="HExtension23" _msthash="1817486" _msttexthash="32331" _mstvisible="7"]] #
312 )))|(% _mstvisible="4" style="width:51px" %)(((
313 [[Unix TimeStamp>>||anchor="H2.6.1A0UnixTimeStamp" _msthash="1817487" _msttexthash="116545" _mstvisible="7"]]
314 )))
315
316 **Temperature:**
317
318 [[image:image-20220621101526-7.png]]
319
320 Example Payload (FPort=2):  (% style="background-color:yellow" %)**08 CD 02 20 7F FF 01 61 CD 4E DD**
321
322
323 ==== (% style="color:blue" %)**Temperature & External Temperature:**(%%) ====
324
325 * Example1:  0x08CD/100=22.53℃
326 * Example2:  (0xF5C6-65536)/100=-26.18℃
327
328 ==== (% style="color:blue" %)**Humidity:**(%%) ====
329
330 * Humidity:    0x0220/10=54.4%
331
332 ==== (% style="color:blue" %)**Extension #**(%%) ====
333
334 Bytes for External Sensor:
335
336 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:310px" %)
337 |=(% style="width: 103px;" %)**EXT # Value**|=(% style="width: 203px;" %)**External Sensor Probe**
338 |(% style="width:103px" %)0x01|(% style="width:203px" %)Sensor AS-01, Temperature
339
340
341 === 2.4.3  Uplink FPORT~=3, Datalog sensor value ===
342
343 LHT52 stores sensor value and user can retrieve these history value via downlink command. The Datalog sensor value are sent via FPORT=3.
344
345 [[image:image-20220621101659-8.png||height="515" width="1381"]](% style="display:none" %)
346
347
348 * Each data entry is 11 bytes, to save airtime and battery, LHT52 will send max bytes according to the current DR and Frequency bands.(% style="display:none" %)
349
350 For example, in US915 band, the max payload for different DR is:
351
352 1. DR0: max is 11 bytes so one entry of data
353 1. DR1: max is 53 bytes so devices will upload 4 entries of data (total 44 bytes)
354 1. DR2: total payload includes 11 entries of data
355 1. DR3: total payload includes 22 entries of data.
356
357 (% style="color:red" %)**Notice**: LHT52 will save 178 set of history data, If device doesn't have any data in the polling time. Device will uplink 11 bytes of 0.
358
359 See more info about the [[Datalog feature>>||anchor="H2.6A0DatalogFeature"]].
360
361
362
363 === 2.4.4  Uplink FPORT~=4, DS18B20 ID ===
364
365 User can get external DS18B20 ID through the downlink command.
366
367 Downlink:  0x2302
368
369 [[image:image-20220621101853-9.png||height="529" width="1366"]]
370
371 Example Payload (FPort=4):  (% style="color:#037691" %)**28 86 63 B2 00 00 00 9F**
372
373 The External DS18B20 ID is 0x28 86 63 B2 00 00 00 9F
374
375
376
377 === 2.4.5  Decoder in TTN V3 ===
378
379 In LoRaWAN protocol, the uplink payload is HEX format, user need to add a payload formatter/decoder in LoRaWAN Server to get human friendly string.
380
381 In TTN , add formatter as below:
382
383 [[image:image-20220621102026-10.png]]
384
385 (((
386 Please check the decoder from this link:
387 )))
388
389 (((
390 [[https:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LHT52/Decoder/>>url:https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LHT52/Decoder/]] 
391 )))
392
393 (% style="display:none" %) (%%)
394
395 (% style="display:none" %) (%%)
396
397 == 2.5 Show data on Datacake ==
398
399 (((
400 Datacake IoT platform provides a human friendly interface to show the sensor data in charts, once we have sensor data in TTN V3, we can use Datacake to connect to TTN V3 and see the data in Datacake. Below are the steps:
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402
403 (((
404
405 )))
406
407 (((
408 (% style="color:blue" %)**Step 1**(%%):  Be sure that your device is programmed and properly connected to the LoRaWAN network.
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410
411 (((
412 (% style="color:blue" %)**Step 2**(%%):  Configure your Application to forward data to Datacake you will need to add integration. Go to TTN V3 Console ~-~-> Applications ~-~-> Integrations ~-~-> Add Integrations.
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414
415 (((
416 ~1. Add Datacake:
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418
419 (((
420 2. Select default key as Access Key:
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422
423 (((
424 3. In Datacake console ([[https:~~/~~/datacake.co/>>url:https://datacake.co/]]) , add LHT52:
425 )))
426
427 (((
428 Please refer to the figure below
429 )))
430
431
432 [[image:image-20220621112422-1.png]]
433
434
435 Log in to DATACAKE, copy the API under the account
436
437 [[image:image-20220621112422-2.png]]
438
439
440 [[image:image-20220621112422-3.png]]
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442
443
444 [[image:image-20220621112422-4.png||height="741" width="1237"]]
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447 [[image:image-20220621112422-5.png||height="314" width="1226"]]
448
449
450 [[image:image-20220621112422-6.png]]
451
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453 [[image:image-20220621112422-7.png]]
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455 [[image:image-20220621112422-8.png]]
456
457
458 [[image:image-20220621112422-9.png||height="338" width="1211"]]
459
460
461 [[image:image-20220621112422-10.png||height="372" width="1215"]]
462
463
464 Copy and paste the [[TTN decoder>>url:https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LHT52/Decoder/]] here and save
465
466 [[image:image-20220621112422-11.png||height="575" width="1215"]]
467
468
469 Visual widgets please read the DATACAKE documentation
470
471 [[image:image-20220622154805-1.png]]
472
473
474
475 == 2.6  Datalog Feature ==
476
477 (% _msthash="315262" _msttexthash="32283004" _mstvisible="1" %)
478 When user want to retrieve sensor value, he can send a poll command from the IoT platform to ask sensor to send value in the required time slot.
479
480
481 === 2.6.1  Unix TimeStamp ===
482
483 Unix TimeStamp shows the sampling time of uplink payload. format base on
484
485 [[image:image-20220523001219-11.png||_mstalt="450450" _mstvisible="3" height="97" width="627"]]
486
487 User can get this time from link:  [[https:~~/~~/www.epochconverter.com/>>url:https://www.epochconverter.com/||_mstvisible="3"]] :
488
489 For example: if the Unix Timestamp we got is hex 0x60137afd, we can convert it to Decimal: 1611889405. and then convert to the time: 2021 – Jan ~-~- 29 Friday 03:03:25 (GMT)
490
491
492 [[image:1655782409139-256.png]]
493
494
495
496 === 2.6.2  Poll sensor value ===
497
498 (((
499 User can poll sensor value based on timestamps from the server. Below is the downlink command.
500 )))
501
502 (((
503 Timestamp start and Timestamp end use Unix TimeStamp format as mentioned above. Devices will reply with all data log during this time period, use the uplink interval.
504 )))
505
506 (((
507 For example, downlink command [[image:image-20220621113526-13.png]] (% _mstvisible="3" style="display:none" %)
508 )))
509
510 (((
511 Is to check 2020/12/1 07:40:00 to 2020/12/1 08:40:00's data
512 )))
513
514 (((
515 Uplink Internal =5s，means LHT52 will send one packet every 5s. range 5~~255s.
516 )))
517
518
519
520 === 2.6.3  Datalog Uplink payload ===
521
522 See [[Uplink FPORT=3, Datalog sensor value>>||anchor="H2.4.3A0UplinkFPORT3D32CDatalogsensorvalue"]]
523
524 (% style="display:none" %) (%%)
525
526 (% style="display:none" %) (%%)
527
528 == 2.7  Alarm Mode ==
529
530 (((
531 When device is in Alarm mode, it will check the built-in sensor temperature in a short interval. If the temperature exceeds the pre-configure range, it will send an uplink immediately.
532 )))
533
534 (((
535 The alarm mode can be modified by AT command or downlink, Alarm mode is disabled by default.
536 )))
537
538 (((
539 If you need to enable the Alarm mode, please refer to the following
540 )))
541
542 (((
543 (% style="color:red" %)**Note: Alarm mode will increase the power consumption, we recommend extending the normal uplink time (20 minutes default) when enable this feature.**
544 )))
545
546 (((
547
548 )))
549
550 (((
551 (% style="color:blue" %)**AT Commands for Alarm mode:**
552 )))
553
554 (((
555 (% style="color:#037691" %)**AT+WMOD=1**(%%)**: ** Enable/Disable Alarm Mode. (0:Disable, 1: Enable),need to reset the node to take effect
556 )))
557
558 (((
559 (% style="color:#037691" %)**AT+CITEMP=1**(%%)**: ** The interval to check temperature for Alarm. (Unit: minute)
560 )))
561
562 (((
563 (% style="color:#037691" %)**AT+ARTEMP=-40,125**(%%)**:   ** Set the normal temperature range from -40°C to 125°C
564 )))
565
566 (((
567 Suppose you want to set the normal temperature from 15°C to 50°C, and turn on the alarm mode, and check the temperature every 2 minutes. Please refer to the following
568 )))
569
570 [[image:image-20220621114109-14.png]]
571
572 [[image:image-20220621114109-15.png]]
573
574
575 (((
576 Modification via downlink,Take TTN_V3 as an example((% style="color:red" %)downlink commands, please refer to the downlink command set for details(%%))
577 )))
578
579 (((
580 In order to ensure that the node is indeed modified by downlink, I reset the node to factory settings first.
581 )))
582
583 [[image:image-20220621114109-16.png]]
584
585
586 [[image:image-20220621114109-17.png||height="583" width="1274"]]
587
588 [[image:image-20220621114109-18.png]]
589
590
591 Or use a downlink directly: AA010002000F0032 ([[See command info>>||anchor="H3.1A0DownlinkCommandSet"]])
592
593 [[image:image-20220621114109-19.png||height="178" width="1292"]]
594
595
596
597 == 2.8 LED Indicator ==
598
599 (((
600 The LHT52 has a triple color LED which for easy showing different stage.
601 )))
602
603
604 (((
605 (% style="color:#037691" %)**In a normal working state**:
606 )))
607
608 * When the node is restarted, (% style="color:green" %)GREEN, (% style="color:red" %)RED(%%) and (% style="color:blue" %)BLUE(%%) are sequentially lit.
609
610 * During OTAA Join:
611 ** **For each Join Request uplink:** the (% style="color:green" %)GREEN LED (%%)will blink once.
612 ** **Once Join Successful:** the (% style="color:green" %)GREEN LED(%%) will be solid on for 5 seconds.
613
614 * After joined, for each uplink, the (% style="color:blue" %)BLUE LED(%%) or (% style="color:green" %)GREEN LED (%%)will blink once.
615 ** (% style="color:blue" %)BLUE LED(%%) when external sensor is connected
616 ** (% style="color:green" %)GREEN LED(%%) when external sensor is not connected
617
618 * For each success downlink, the (% style="color:purple" %)PURPLE LED(%%) will blink once
619
620 (((
621 (% style="color:#037691" %)**In AT Command Mode:**
622 )))
623
624 (((
625 If user use console cable to send AT Command to LHT52, the (% style="color:red" %)**RED LED**(%%) will always on until:
626 )))
627
628 * Power off/on LHT52
629 * Press reset button of LHT52.
630 * Send an AT Command: AT+CLPM=1
631
632 (% style="display:none" %) (%%)
633
634
635 == 2.9 Button ==
636
637 Press the button LHT52 will reset and join network again.
638
639
640
641 = 3.  Configure LHT52 via AT command or LoRaWAN downlink =
642
643 Use can configure LHT52 via AT Command or LoRaWAN Downlink.
644
645 * AT Command Connection: See [[FAQ>>||anchor="H6.FAQ"]].
646
647 * LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]]
648
649 There are two kinds of commands to configure LHT52, they are:
650
651 * (% style="color:#4f81bd" %)**General Commands:**
652
653 These commands are to configure:
654
655 * General system settings like: uplink interval.
656
657 * LoRaWAN protocol & radio-related commands.
658
659 They are the same for all Dragino Devices which supports DLWS-005 LoRaWAN Stack(Note~*~*). These commands can be found on the wiki: [[End Device Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
660
661
662 * (% style="color:#4f81bd" %)**Commands special design for LHT52**
663
664 These commands are only valid for LHT52, as below:
665
666
667 == 3.1  Downlink Command Set ==
668
669
670 (% border="1" cellpadding="0" cellspacing="10" style="background-color:#ffffcc; color:green; width:500px" %)
671 |=(% style="width: 100px;" %)**Command Example**|=(% style="width: 150px;" %)**Function**|=(% style="width: 100px;" %)**Response**|=(% style="width: 150px;" %)**Downlink**
672 |(% style="width:161px" %)AT+TDC=?|(% style="width:138px" %)View current TDC time|(% style="width:243px" %)(((
673 1200000
674
675
676 OK
677 )))|(% style="width:1001px" %)Default 1200000(ms)
678 |(% style="width:161px" %)AT+TDC=300000|(% style="width:138px" %)Set TDC time|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
679 0X0100012C:
680
681 01:fixed command
682
683 00012C:0X00012C=300(seconds)
684 )))
685 |(% style="width:161px" %)ATZ|(% style="width:138px" %)Reset node|(% style="width:243px" %) |(% style="width:1001px" %)0x04FF
686 |(% style="width:161px" %)AT+FDR|(% style="width:138px" %)Restore factory settings|(% style="width:243px" %) |(% style="width:1001px" %)0X04FE
687 |(% style="width:161px" %)AT+CFM=?|(% style="width:138px" %)View the current confirmation mode status|(% style="width:243px" %)(((
688 0
689
690 OK
691 )))|(% style="width:1001px" %)Default 0
692 |(% style="width:161px" %)AT+CFM=1|(% style="width:138px" %)Turn on confirmation mode|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
693 0x0500:close
694
695 0x0501:open
696
697 05:fixed command
698 )))
699 |(% style="width:161px" %)AT+CHE=?|(% style="width:138px" %)View the current sub-band select 0-7, the default is 0|(% style="width:243px" %)(((
700 0
701
702 OK
703 )))|(% style="width:1001px" %)Default 0
704 |(% style="width:161px" %)AT+CHE=2|(% style="width:138px" %)(((
705 Set subband to 2
706
707 (CN470,US915,AU915)
708 )))|(% style="width:243px" %)(((
709 Attention:Take effect after ATZ
710
711 OK
712
713
714 )))|(% style="width:1001px" %)(((
715 0X0702:
716
717 07:fixed command
718
719 02:Select subband 2
720 )))
721 |(% style="width:161px" %)AT+WMOD=?|(% style="width:138px" %)View the current alarm mode status|(% style="width:243px" %)(((
722 0
723
724 OK
725 )))|(% style="width:1001px" %)Default 0
726 |(% style="width:161px" %)AT+WMOD=1|(% style="width:138px" %)Turn on alarm mode|(% style="width:243px" %)(((
727 Attention:Take effect after ATZ
728
729 OK
730
731
732 )))|(% style="width:1001px" %)(((
733 0xA501:open
734
735 0XA500:close
736
737 A5:fixed command
738
739
740 )))
741 |(% style="width:161px" %)AT+CITEMP=?|(% style="width:138px" %)View the current temperature detection time interval|(% style="width:243px" %)(((
742 1
743
744 OK
745 )))|(% style="width:1001px" %)Default 1(min)
746 |(% style="width:161px" %)AT+CITEMP=2|(% style="width:138px" %)Set the temperature detection time interval to 2min|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
747 0XA70002
748
749 A7:fixed command
750
751 0002:0X0002=2(min)
752 )))
753 |(% style="width:161px" %)AT+NJM=?|(% style="width:138px" %)Check the current network connection method|(% style="width:243px" %)(((
754 1
755
756 OK
757 )))|(% style="width:1001px" %)Default 1
758 |(% style="width:161px" %)AT+NJM=0|(% style="width:138px" %)Change the network connection method to ABP|(% style="width:243px" %)(((
759 Attention:Take effect after ATZ
760
761 OK
762
763
764 )))|(% style="width:1001px" %)(((
765 0X2000:ABP
766
767 0x2001:OTAA
768
769 20:fixed command
770
771
772 )))
773 |(% style="width:161px" %)AT+RPL=?|(% style="width:138px" %)View current RPL settings|(% style="width:243px" %)(((
774 0
775
776 OK
777 )))|(% style="width:1001px" %)Default 0
778 |(% style="width:161px" %)AT+RPL=1|(% style="width:138px" %)set RPL=1|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
779 0x2101:
780
781 21:fixed command
782
783 01:for details, check wiki
784 )))
785 |(% style="width:161px" %)AT+ADR=?|(% style="width:138px" %)View current ADR status|(% style="width:243px" %)(((
786 1
787
788 OK
789 )))|(% style="width:1001px" %)Default 0
790 |(% style="width:161px" %)AT+ADR=0|(% style="width:138px" %)Set the ADR state to off|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
791 0x2200:close
792
793 0x2201:open
794
795 22:fixed command
796 )))
797 |(% style="width:161px" %)AT+DR=?|(% style="width:138px" %)View the current DR settings|(% style="width:243px" %)OK|(% style="width:1001px" %)
798 |(% style="width:161px" %)AT+DR=1|(% style="width:138px" %)(((
799 set DR to 1
800
801 It takes effect only when ADR=0
802 )))|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
803 0X22000101:
804
805 00:ADR=0
806
807 01:DR=1
808
809 01:TXP=1
810
811 22:fixed command
812 )))
813 |(% style="width:161px" %)AT+TXP=?|(% style="width:138px" %)View the current TXP|(% style="width:243px" %)OK|(% style="width:1001px" %)
814 |(% style="width:161px" %)AT+TXP=1|(% style="width:138px" %)(((
815 set TXP to 1
816
817 It takes effect only when ADR=0
818 )))|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
819 0X22000101:
820
821 00:ADR=0
822
823 01:DR=1
824
825 01:TXP=1
826
827 22:fixed command
828 )))
829 |(% style="width:161px" %) |(% style="width:138px" %)Upload node configuration or DS18B20 ID|(% style="width:243px" %) |(% style="width:1001px" %)(((
830 0X2301:Upload node configuration
831
832 0x2302:Upload DS18B20 ID
833
834 23:fixed command
835 )))
836 |(% style="width:161px" %)AT+DWELL=?|(% style="width:138px" %)Check the high-rate upload settings|(% style="width:243px" %)(((
837 1
838
839 OK
840 )))|(% style="width:1001px" %)Default 1
841 |(% style="width:161px" %)AT+DWELL=1|(% style="width:138px" %)(((
842 Set high rate upload
843
844 (AS923,AU915)
845 )))|(% style="width:243px" %)(((
846 Attention:Take effect after ATZ
847
848 OK
849
850
851 )))|(% style="width:1001px" %)(((
852 0x2501:close
853
854 0x2500:open
855
856 25:fixed command
857
858 for details, check wiki
859 )))
860 |(% style="width:161px" %)AT+RJTDC=?|(% style="width:138px" %)View current RJTDC set time|(% style="width:243px" %)(((
861 20
862
863 OK
864 )))|(% style="width:1001px" %)Default 20(min)
865 |(% style="width:161px" %)AT+RJTDC=10|(% style="width:138px" %)Set RJTDC time interval|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
866 0X26000A:
867
868 26:fixed command
869
870 000A:0X000A=10(min)
871
872 for details, check wiki
873 )))
874 |(% style="width:161px" %) |(% style="width:138px" %)Retrieve stored data for a specified period of time|(% style="width:243px" %) |(% style="width:1001px" %)(((
875 0X3161DE7C7061DE8A800A:
876
877 31:fixed command
878
879 61DE7C70:0X61DE7C70=2022/1/12 15:00:00
880
881 61DE8A80:0X61DE8A80=2022/1/12 16:00:00
882
883 0A:0X0A=10(second)
884
885 View details 2.6.2
886 )))
887 |(% style="width:161px" %)AT+DDETECT=?|(% style="width:138px" %)View the current DDETECT setting status and time|(% style="width:243px" %)(((
888 0,1440
889
890 OK
891 )))|(% style="width:1001px" %)Default 0,1440(min)
892 |(% style="width:161px" %)AT+DDETECT=1,1440|(% style="width:138px" %)(((
893 Set DDETECT setting status and time
894
895 ((% style="color:red" %)When the node does not receive the downlink packet within the set time, it will re-enter the network(%%))
896 )))|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
897 0X320005A0:close
898
899 0X320105A0:open
900
901 32:fixed command
902
903 05A0:0X05A0=1440(min)
904 )))
905 |(% style="width:161px" %) |(% style="width:138px" %)(((
906 Downlink Modification Alarm Mode
907
908 (AT+WMOD,AT+CITEMP,AT+ARTEMP)
909 )))|(% style="width:243px" %) |(% style="width:1001px" %)(((
910 0XAA010002000F00032:
911
912 AA:fixed command
913
914 01:0X01=1(AT+MOD)
915
916 0002:0X0002=2(AT+CITEMP)
917
918 000F:0X000F=15(AT+ARTEMP)
919
920 0032:0X0032=50(AT+ARTEMP)
921 )))
922
923
924
925
926 == 3.2  Set Password ==
927
928 Feature: Set device password, max 9 digits.
929
930 (% style="color:#4f81bd" %)**AT Command: AT+PWORD**
931
932 [[image:image-20220523151052-5.png||_mstalt="428623" _mstvisible="3"]]
933
934
935 (% style="color:#4f81bd" %)**Downlink Command:**
936
937 No downlink command for this feature.
938
939
940
941 = 4.  Battery & How to replace =
942
943 == 4.1  Battery Type and replace ==
944
945 LHT52 uses 2 x AAA LR03(1.5v) batteries. If the batteries running low (shows 2.1v in the platform). User can buy generic AAA battery and replace it.
946
947 (% style="color:red" %)**Note: **
948
949 1.  The LHT52 doesn't have any screw, use can use nail to open it by the middle.
950
951 [[image:image-20220621143535-5.png]]
952
953
954 2.  Make sure the direction is correct when install the AAA batteries.
955
956 [[image:image-20220621143535-6.png]]
957
958
959
960 == 4.2  Power Consumption Analyze ==
961
962 Dragino battery powered product are all runs in Low Power mode. We have an update battery calculator which base on the measurement of the real device. User can use this calculator to check the battery life and calculate the battery life if want to use different transmit interval.
963
964 Instruction to use as below:
965
966 (% style="color:blue" %)**Step 1**(%%):  Downlink the up-to-date DRAGINO_Battery_Life_Prediction_Table.xlsx from:
967
968 [[https:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/Battery_Analyze/>>url:https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/Battery_Analyze/]]
969
970
971 (% style="color:blue" %)**Step 2**(%%):  (% style="display:none" %) (%%)Open it and choose
972
973 * Product Model
974 * Uplink Interval
975 * Working Mode
976
977 And the Life expectation in difference case will be shown on the right.
978
979 [[image:image-20220621143643-7.png||height="429" width="1326"]]
980
981
982
983 = 5.  Sensors and Accessories =
984
985 == 5.1  Temperature Probe (AS-01) ==
986
987 External Temperature Probe base on DS18B20. (note: Default Package doesn't include AS-01)
988
989 [[image:image-20220621141939-4.png||height="315" width="279"]] [[image:image-20220621141546-2.png||height="308" width="205"]](% style="display:none" %)
990
991
992 **External Temperature Probe (AS-01):(% style="display:none" %) (%%)**
993
994 * Resolution: 0.0625 °C
995 * ±0.5°C accuracy from -10°C to +85°C
996 * ±2°C accuracy from -55°C to +125°C
997 * Operating Range: -55 °C ~~ 125 °C
998 * Cable Length: 2 meters
999
1000
1001
1002 == 5.2  Program Converter (AS-02) ==
1003
1004 AS-02 is an optional accessory, it is USB Type-C converter. AS-02 provide below feature:
1005
1006 1. Access AT console of LHT52 when used with USB-TTL adapter. [[See this link>>||anchor="H6.1HowtouseATCommandtoconfigureLHT52"]].
1007 1. Update firmware to LHT52 when used with DAP-Link adapter.  [[See this link>>doc:Main.Firmware Upgrade Instruction.WebHome||anchor="H2.3LHT52"]].
1008
1009 [[image:image-20220621141724-3.png]]
1010
1011
1012
1013 = 6. FAQ =
1014
1015 == 6.1 How to use AT Command to configure LHT52 ==
1016
1017 LHT52 supports AT Command set. User can use a USB to TTL adapter plus the Program Cable to connect to LHT52 for using AT command, as below.
1018
1019 [[image:image-20220621144150-8.png||height="537" width="724"]]
1020
1021
1022 **Connection:**
1023
1024 * (% style="background-color:yellow" %)USB to TTL GND <~-~-> Program Converter GND pin
1025 * (% style="background-color:yellow" %)USB to TTL RXD  <~-~-> Program Converter D+ pin
1026 * (% style="background-color:yellow" %)USB to TTL TXD  <~-~-> Program Converter A11 pin
1027
1028 It is also possible to connect using DAPLink
1029
1030 [[image:image-20220621144235-9.png||height="485" width="729"]]
1031
1032 (((
1033 **Connection:**
1034 )))
1035
1036 * (((
1037 (% style="background-color:yellow" %)USB to DAP-LINK GND <~-~-> Program Converter GND pin
1038 )))
1039 * (((
1040 (% style="background-color:yellow" %)USB to DAP-LINK RXD  <~-~-> Program Converter D+ pin
1041 )))
1042 * (((
1043 (% style="background-color:yellow" %)USB to DAP-LINK TXD  <~-~-> Program Converter A11 pin
1044 )))
1045
1046 (((
1047
1048
1049 In PC, User needs to set **serial tool**(such as [[putty>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to (% style="color:green" %)**115200**(%%) to access to access serial console for LHT52. The AT commands are disable by default and need to enter password (default:(% style="color:green" %)**123456**(%%)) to active it. Timeout to input AT Command is 5 min, after 5-minute, user need to input password again.
1050 )))
1051
1052 (((
1053 Input password and ATZ to activate LHT52,As shown below:
1054 )))
1055
1056
1057 [[image:image-20220621144235-10.png]]
1058
1059
1060
1061 == 6.2  AT Command and Downlink ==
1062
1063 (((
1064 Sending ATZ will reboot the node
1065 )))
1066
1067 (((
1068 Sending AT+FDR will restore the node to factory settings
1069 )))
1070
1071 (((
1072 Get the node's AT command setting by sending AT+CFG
1073 )))
1074
1075 (((
1076
1077 )))
1078
1079 (((
1080 **Example：**                                           
1081 )))
1082
1083 (((
1084 AT+VER=EU868 v1.0
1085 )))
1086
1087 (((
1088 AT+NJM=1          
1089 )))
1090
1091 (((
1092 AT+DEUI=25 32 12 45 65 26 12 35
1093 )))
1094
1095 (((
1096 AT+APPEUI=25 32 12 45 65 26 32 16
1097 )))
1098
1099 (((
1100 AT+APPKEY=25 32 12 45 65 26 32 16 89 48 85 65 45 87 89 55
1101 )))
1102
1103 (((
1104 AT+DADDR=00 00 00 00
1105 )))
1106
1107 (((
1108 AT+APPSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1109 )))
1110
1111 (((
1112 AT+NWKSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1113 )))
1114
1115 (((
1116 AT+NWKID=00 00 00 13
1117 )))
1118
1119 (((
1120 AT+ADR=1
1121 )))
1122
1123 (((
1124 AT+DR=5
1125 )))
1126
1127 (((
1128 AT+TXP=1
1129 )))
1130
1131 (((
1132 AT+CHS=0
1133 )))
1134
1135 (((
1136 AT+CLASS=A
1137 )))
1138
1139 (((
1140 AT+CFM=0
1141 )))
1142
1143 (((
1144 AT+JN1DL=5000
1145 )))
1146
1147 (((
1148 AT+JN2DL=6000
1149 )))
1150
1151 (((
1152 AT+RX1DL=5000
1153 )))
1154
1155 (((
1156 AT+RX2DL=6000
1157 )))
1158
1159 (((
1160 AT+RX1WTO=24
1161 )))
1162
1163 (((
1164 AT+RX2WTO=6
1165 )))
1166
1167 (((
1168 AT+RX2FQ=869525000
1169 )))
1170
1171 (((
1172 AT+RX2DR=0
1173 )))
1174
1175 (((
1176 AT+RPL=0
1177 )))
1178
1179 (((
1180 AT+FCU=6
1181 )))
1182
1183 (((
1184 AT+FCD=0
1185 )))
1186
1187 (((
1188 AT+CFS=0
1189 )))
1190
1191 (((
1192 AT+NJS=1
1193 )))
1194
1195 (((
1196 AT+DCS=0
1197 )))
1198
1199 (((
1200 AT+PNM=1
1201 )))
1202
1203 (((
1204 AT+PWORD=123456
1205 )))
1206
1207 (((
1208 AT+EXT=1
1209 )))
1210
1211 (((
1212 AT+TDC=120000
1213 )))
1214
1215 (((
1216 AT+TIMESTAMP=1640851037 2021 12 30 7 57 17
1217 )))
1218
1219 (((
1220 AT+RJTDC=20
1221 )))
1222
1223 (((
1224 AT+DDETECT=0,1440
1225 )))
1226
1227 (((
1228 AT+WMOD=0
1229 )))
1230
1231 (((
1232 AT+CITEMP=1
1233 )))
1234
1235 (((
1236 AT+ARTEMP=-40,125
1237 )))
1238
1239 (((
1240 Send AT+PDTA=? to get the stored 174 data
1241 )))
1242
1243
1244 (((
1245 **Example：**
1246 )))
1247
1248 [[image:image-20220621144804-11.png]]
1249
1250
1251
1252 == 6.3  How to upgrade the firmware? ==
1253
1254 LHT52 requires a program converter to upload images to LHT52, which is used to upload image to LHT52 for:
1255
1256 * Support new features
1257 * For bug fix
1258 * Change LoRaWAN bands.
1259
1260 (((
1261 User can check this link for the detail of operation of firmware upgrade: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction.WebHome||anchor="H2.3LHT52"]]
1262 )))
1263
1264
1265
1266 == 6.4  How to change the LoRa Frequency Bands/Region? ==
1267
1268 User can follow the introduction for [[how to upgrade image>>||anchor="H6.3A0Howtoupgradethefirmware3F"]]. When download the images, choose the required image file for download.
1269
1270
1271
1272 = 7. Order Info =
1273
1274 == 7.1  Main Device ==
1275
1276 (((
1277 Part Number: (% style="color:#4472c4" %)**LHT65N-XX**
1278 )))
1279
1280 (((
1281 (% style="color:#4472c4" %)**XX **(%%): The default frequency band
1282 )))
1283
1284 * (% style="color:red" %)**AS923**(%%)**: **LoRaWAN AS923 band
1285 * (% style="color:red" %)**AU915**(%%)**: **LoRaWAN AU915 band
1286 * (% style="color:red" %)**EU433**(%%)**: **LoRaWAN EU433 band
1287 * (% style="color:red" %)**EU868**(%%)**:** LoRaWAN EU868 band
1288 * (% style="color:red" %)**KR920**(%%)**: **LoRaWAN KR920 band
1289 * (% style="color:red" %)**US915**(%%)**: **LoRaWAN US915 band
1290 * (% style="color:red" %)**IN865**(%%)**:  **LoRaWAN IN865 band
1291 * (% style="color:red" %)**CN470**(%%)**: **LoRaWAN CN470 band
1292
1293
1294
1295 == 7.2  Accessories ==
1296
1297 (% style="color:red" %)Note: below accessories are not include in the main device package, need to order separately.
1298
1299 **Temperature Probe: (% style="color:red" %)AS-01(%%)**
1300
1301 **Program Converter: (% style="color:red" %)AS-02(%%)**
1302
1303
1304
1305 = 8. Packing Info =
1306
1307 **Package Includes**:
1308
1309 * LHT52 Temperature & Humidity Sensor x 1
1310
1311
1312
1313 = 9. Support =
1314
1315 * Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before-mentioned schedule.
1316 * Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]].
1317
1318
1319
1320 = 10. FCC Warning =
1321
1322 This device complies with part 15 of the FCC Rules.Operation is subject to the following two conditions:
1323
1324 (1) This device may not cause harmful interference;
1325
1326 (2) this device must accept any interference received,including interference that may cause undesired operation.
1327

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