Version 215.59 by Xiaoling on 2022/06/22 15:47
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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.
31 )))
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.
35 )))
36
37 (((
38 LHT52 is fully compatible with LoRaWAN v1.0.3 protocol, it can work with standard LoRaWAN gateway.
39 )))
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 = 2.  Operation Mode =
113
114 == 2.1  How it work? ==
115
116 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**.
117
118
119 == 2.2  How to Activate LHT52? ==
120
121 (% style="color:red" %)** 1.  Open enclosure from below position.**
122
123 [[image:image-20220621093835-1.png]]
124
125
126 (% style="color:red" %)** 2.  Insert 2 x AAA LR03 batteries.**
127
128 [[image:image-20220621093835-2.png]]
129
130
131 (% style="color:red" %)** 3.  Press the reset button to activate device.**
132
133 [[image:image-20220621093835-3.png]]
134
135
136 User can check [[LED Status>>||anchor="H2.8LEDIndicator"]] to know the working state of LHT52.
137
138
139
140 == 2.3  Example to join LoRaWAN network ==
141
142 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.
143
144 (% _mstvisible="1" class="wikigeneratedid" %)
145 [[image:1655775912928-657.png]]
146
147 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. 
148
149
150 (% style="color:blue" %)**Step 1**(%%):  Create a device in TTN V3 with the OTAA keys from LHT52.
151
152 Each LHT52 is shipped with a sticker with the default DEV EUI as below:
153
154
155 [[image:image-20220617150003-1.jpeg]]
156
157
158 Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
159
160 Add APP EUI in the application.
161
162 choose to create the device manually.
163
164 Add APP KEY and DEV EUI
165
166
167 [[image:image-20220522232916-3.png||_mstalt="430495" _mstvisible="3"]]
168
169 [[image:1655776122894-257.png]]
170
171
172
173 **Default mode OTAA**
174
175
176 [[image:1655776241177-240.png]]
177
178
179
180 (% 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.
181
182 [[image:image-20220621095134-4.png]]
183
184
185
186 == 2.4  Uplink Payload ==
187
188 Uplink payloads include two types: Valid Sensor Value and other status / control command.
189
190 * Valid Sensor Value: Use FPORT=2
191 * Other control command: Use FPORT other than 2.
192
193 === 2.4.1  Uplink FPORT~=5, Device Status ===
194
195 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.
196
197 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:462px" %)
198 |=(% 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**
199 |(% 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
200
201 [[image:image-20220621100550-5.png]]
202
203 Example Payload (FPort=5):  [[image:image-20220621105116-11.png]]
204
205
206 (% style="color:#4472c4" %)**Sensor Model**(%%): For LHT52, this value is 0x09.
207
208 (% style="color:#4472c4" %)**Firmware Version**(%%): 0x0100, Means: v1.0.0 version.
209
210 (% style="color:#4472c4" %)**Frequency Band**:
211
212 *0x01: EU868
213
214 *0x02: US915
215
216 *0x03: IN865
217
218 *0x04: AU915
219
220 *0x05: KZ865
221
222 *0x06: RU864
223
224 *0x07: AS923
225
226 *0x08: AS923-1
227
228 *0x09: AS923-2
229
230 *0x0a: AS923-3
231
232
233 (% style="color:#4472c4" %)**Sub-Band**(%%): value 0x00 ~~ 0x08(only for CN470, AU915,US915. Others are0x00)
234
235 (% style="color:#4472c4" %)**BAT**(%%): shows the battery voltage for LHT52.
236
237 Ex1: 0x0B3A = 2874mV
238
239
240 Use can also get the Device Status uplink through the downlink command:
241
242 (% style="color:#4472c4" %)**Downlink:  0x2301**
243
244
245 [[image:image-20220621100550-6.png||height="504" width="1491"]]
246
247
248
249 === 2.4.2  Uplink FPORT~=2, Real time sensor value ===
250
251 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"]].
252
253 Uplink uses FPORT=2 and every 20 minutes send one uplink by default.
254
255 (% _mstvisible="1" border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:426px" %)
256 (% _mstvisible="3" %)|=(% _mstvisible="4" style="width: 97px;" %)(% _mstvisible="5" %)
257 (((
258 (% _mstvisible="6" %)
259 (% _msthash="1817478" _msttexthash="161122" _mstvisible="8" %)**Size(bytes)**
260 )))|=(% _mstvisible="4" style="width: 39px;" %)(% _mstvisible="5" %)
261 (((
262 (% _mstvisible="6" %)
263 (% _msthash="1817479" _msttexthash="4550" _mstvisible="8" %)**2**
264 )))|=(% _mstvisible="4" style="width: 100px;" %)(% _mstvisible="5" %)
265 (((
266 (% _mstvisible="6" %)
267 (% _msthash="1817480" _msttexthash="4550" _mstvisible="8" %)**2**
268 )))|=(% _mstvisible="4" style="width: 77px;" %)(% _mstvisible="5" %)
269 (((
270 (% _mstvisible="6" %)
271 (% _msthash="1817481" _msttexthash="4550" _mstvisible="8" %)**2**
272 )))|=(% _mstvisible="4" style="width: 47px;" %)(% _mstvisible="5" %)
273 (((
274 (% _mstvisible="6" %)
275 (% _msthash="1817482" _msttexthash="4459" _mstvisible="8" %)**1**
276 )))|=(% _mstvisible="4" style="width: 51px;" %)(% _mstvisible="5" %)
277 (((
278 (% _mstvisible="6" %)
279 (% _msthash="1817483" _msttexthash="4732" _mstvisible="8" %)**4**
280 )))
281 (% _mstvisible="3" %)|(% _mstvisible="4" style="width:97px" %)(% _mstvisible="5" %)
282 (((
283 (% _mstvisible="6" %)
284 (% _msthash="1817484" _msttexthash="60203" _mstvisible="8" %)**Value**
285 )))|(% _mstvisible="4" style="width:39px" %)(% _mstvisible="5" %)
286 (((
287 (% _mstvisible="6" %)
288 [[Temperature>>||anchor="HTemperature26ExternalTemperature:" _msthash="2224742" _msttexthash="405769" _mstvisible="8"]]
289 )))|(% _mstvisible="4" style="width:100px" %)(% _mstvisible="5" %)
290 (((
291 (% _mstvisible="6" %)
292 (((
293 (% _mstvisible="7" %)
294 [[Humidity>>||anchor="HHumidity:" _msthash="2224744" _msttexthash="117429" _mstvisible="8"]]
295
296 (% _mstvisible="7" %)
297
298 )))
299 )))|(% _mstvisible="4" style="width:77px" %)(% _mstvisible="5" %)
300 (((
301 (% _mstvisible="6" %)
302 (((
303 (% _mstvisible="7" %)
304 [[External Temperature>>||anchor="HTemperature26ExternalTemperature:" _msthash="2224742" _msttexthash="405769" _mstvisible="8"]]
305 )))
306 )))|(% _mstvisible="4" style="width:47px" %)(% _mstvisible="5" %)
307 (((
308 (% _mstvisible="6" %)
309 [[Ext>>||anchor="HExtension23" _msthash="1817486" _msttexthash="32331" _mstvisible="7"]] #
310 )))|(% _mstvisible="4" style="width:51px" %)(((
311 [[Unix TimeStamp>>||anchor="H2.6.1A0UnixTimeStamp" _msthash="1817487" _msttexthash="116545" _mstvisible="7"]]
312 )))
313
314 **Temperature:**
315
316 [[image:image-20220621101526-7.png]]
317
318 Example Payload (FPort=2):  (% style="background-color:yellow" %)**08 CD 02 20 7F FF 01 61 CD 4E DD**
319
320
321 ==== **Temperature & External Temperature:** ====
322
323 * Example1:  0x08CD/100=22.53℃
324 * Example2:  (0xF5C6-65536)/100=-26.18℃
325
326 ==== **Humidity:** ====
327
328 * Humidity:    0x0220/10=54.4%
329
330 ==== **Extension #** ====
331
332 Bytes for External Sensor:
333
334 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:310px" %)
335 |=(% style="width: 103px;" %)**EXT # Value**|=(% style="width: 203px;" %)**External Sensor Probe**
336 |(% style="width:103px" %)0x01|(% style="width:203px" %)Sensor AS-01, Temperature
337
338 === 2.4.3  Uplink FPORT~=3, Datalog sensor value ===
339
340 LHT52 stores sensor value and user can retrieve these history value via downlink command. The Datalog sensor value are sent via FPORT=3.
341
342 [[image:image-20220621101659-8.png]]
343
344
345 * Each data entry is 11 bytes, to save airtime and battery, LHT52 will send max bytes according to the current DR and Frequency bands.
346
347 For example, in US915 band, the max payload for different DR is:
348
349 1. DR0: max is 11 bytes so one entry of data
350 1. DR1: max is 53 bytes so devices will upload 4 entries of data (total 44 bytes)
351 1. DR2: total payload includes 11 entries of data
352 1. DR3: total payload includes 22 entries of data.
353
354 (% 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.
355
356 See more info about the [[Datalog feature>>||anchor="H2.6A0DatalogFeature"]].
357
358
359
360
361 === 2.4.4  Uplink FPORT~=4, DS18B20 ID ===
362
363 User can get external DS18B20 ID through the downlink command.
364
365 Downlink:0x2302
366
367 [[image:image-20220621101853-9.png]]
368
369 Example Payload (FPort=4):  (% style="color:#037691" %)**28 86 63 B2 00 00 00 9F**
370
371 The External DS18B20 ID is 0x28 86 63 B2 00 00 00 9F
372
373
374
375 === 2.4.5  Decoder in TTN V3 ===
376
377 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.
378
379 In TTN , add formatter as below:
380
381 [[image:image-20220621102026-10.png]]
382
383 (((
384 Please check the decoder from this link:
385
386 (((
387 [[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/]]
388
389
390
391
392 == 2.5 Show data on Datacake ==
393
394 (((
395 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:
396 )))
397
398 (((
399
400 )))
401
402 (((
403 (% style="color:blue" %)**Step 1**(%%):  Be sure that your device is programmed and properly connected to the LoRaWAN network.
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405
406 (((
407 (% 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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409
410 (((
411 ~1. Add Datacake:
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413
414 (((
415 2. Select default key as Access Key:
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417
418 (((
419 3. In Datacake console ([[https:~~/~~/datacake.co/>>url:https://datacake.co/]]) , add LHT52:
420 )))
421
422 (((
423 Please refer to the figure below
424 )))
425
426
427 [[image:image-20220621112422-1.png]]
428
429
430
431 Log in to DATACAKE, copy the API under the account
432
433 [[image:image-20220621112422-2.png]]
434
435
436 [[image:image-20220621112422-3.png]]
437
438
439
440 [[image:image-20220621112422-4.png]]
441
442
443 [[image:image-20220621112422-5.png]]
444
445
446 [[image:image-20220621112422-6.png]]
447
448
449 [[image:image-20220621112422-7.png]]
450
451 [[image:image-20220621112422-8.png]]
452
453
454 [[image:image-20220621112422-9.png]]
455
456
457 [[image:image-20220621112422-10.png||height="372" width="1215"]]
458
459
460 Copy and paste the [[TTN decoder>>url:https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LHT52/Decoder/]] here and save
461
462 [[image:image-20220621112422-11.png||height="575" width="1215"]]
463
464
465 Visual widgets please read the DATACAKE documentation
466
467 [[image:image-20220621112422-12.png||height="713" width="1180"]]
468
469
470
471 == 2.6  Datalog Feature ==
472
473 (% _msthash="315262" _msttexthash="32283004" _mstvisible="1" %)
474 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.
475
476
477
478 === 2.6.1  Unix TimeStamp ===
479
480 Unix TimeStamp shows the sampling time of uplink payload. format base on
481
482 [[image:image-20220523001219-11.png||_mstalt="450450" _mstvisible="3" height="97" width="627"]]
483
484 User can get this time from link:  [[https:~~/~~/www.epochconverter.com/>>url:https://www.epochconverter.com/||_mstvisible="3"]] :
485
486 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)
487
488
489 [[image:1655782409139-256.png]]
490
491
492
493 === 2.6.2  Poll sensor value ===
494
495 (((
496 User can poll sensor value based on timestamps from the server. Below is the downlink command.
497 )))
498
499 (((
500 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.
501 )))
502
503 (((
504 For example, downlink command [[image:image-20220621113526-13.png]] (% _mstvisible="3" style="display:none" %)
505 )))
506
507 (((
508 Is to check 2020/12/1 07:40:00 to 2020/12/1 08:40:00's data
509 )))
510
511 (((
512 Uplink Internal =5s，means LHT52 will send one packet every 5s. range 5~~255s.
513 )))
514
515
516
517 === 2.6.3  Datalog Uplink payload ===
518
519 See [[Uplink FPORT=3, Datalog sensor value>>||anchor="H2.4.3A0UplinkFPORT3D32CDatalogsensorvalue"]]
520
521
522
523 == 2.7  Alarm Mode ==
524
525 (((
526 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.
527 )))
528
529 (((
530 The alarm mode can be modified by AT command or downlink, Alarm mode is disabled by default.
531 )))
532
533 (((
534 If you need to enable the Alarm mode, please refer to the following
535 )))
536
537 (((
538 (% 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.**
539 )))
540
541 (((
542
543 )))
544
545 (((
546 (% style="color:blue" %)**AT Commands for Alarm mode:**
547 )))
548
549 (((
550 (% style="color:#037691" %)**AT+WMOD=1**(%%)**: ** Enable/Disable Alarm Mode. (0:Disable, 1: Enable),need to reset the node to take effect
551 )))
552
553 (((
554 (% style="color:#037691" %)**AT+CITEMP=1**(%%)**: ** The interval to check temperature for Alarm. (Unit: minute)
555 )))
556
557 (((
558 (% style="color:#037691" %)**AT+ARTEMP=-40,125**(%%)**:   ** Set the normal temperature range from -40°C to 125°C
559 )))
560
561 (((
562 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
563 )))
564
565 [[image:image-20220621114109-14.png]]
566
567 [[image:image-20220621114109-15.png]]
568
569
570 (((
571 Modification via downlink,Take TTN_V3 as an example((% style="color:red" %)downlink commands, please refer to the downlink command set for details(%%))
572 )))
573
574 (((
575 In order to ensure that the node is indeed modified by downlink, I reset the node to factory settings first.
576 )))
577
578 [[image:image-20220621114109-16.png]]
579
580
581 [[image:image-20220621114109-17.png||height="583" width="1274"]]
582
583 [[image:image-20220621114109-18.png]]
584
585
586 Or use a downlink directly: AA010002000F0032 ([[See command info>>||anchor="H3.1A0DownlinkCommandSet"]])
587
588 [[image:image-20220621114109-19.png||height="178" width="1292"]]
589
590
591
592 == 2.8 LED Indicator ==
593
594 (((
595 The LHT52 has a triple color LED which for easy showing different stage.
596 )))
597
598
599 (((
600 (% style="color:#037691" %)**In a normal working state**:
601 )))
602
603 * When the node is restarted, (% style="color:green" %)GREEN, (% style="color:red" %)RED(%%) and (% style="color:blue" %)BLUE(%%) are sequentially lit.
604
605 * During OTAA Join:
606 ** **For each Join Request uplink:** the (% style="color:green" %)GREEN LED (%%)will blink once.
607 ** **Once Join Successful:** the (% style="color:green" %)GREEN LED(%%) will be solid on for 5 seconds.
608
609 * After joined, for each uplink, the (% style="color:blue" %)BLUE LED(%%) or (% style="color:green" %)GREEN LED (%%)will blink once.
610 ** (% style="color:blue" %)BLUE LED(%%) when external sensor is connected
611 ** (% style="color:green" %)GREEN LED(%%) when external sensor is not connected
612
613 * For each success downlink, the (% style="color:purple" %)PURPLE LED(%%) will blink once
614
615
616 (((
617 (% style="color:#037691" %)**In AT Command Mode:**
618 )))
619
620 (((
621 If user use console cable to send AT Command to LHT52, the (% style="color:red" %)**RED LED**(%%) will always on until:
622 )))
623
624 * Power off/on LHT52
625 * Press reset button of LHT52.
626 * Send an AT Command: AT+CLPM=1
627
628
629
630 == 2.9 Button ==
631
632 Press the button LHT52 will reset and join network again.
633
634
635
636 = 3.  Configure LHT52 via AT command or LoRaWAN downlink =
637
638 Use can configure LHT52 via AT Command or LoRaWAN Downlink.
639
640 * AT Command Connection: See [[FAQ>>||anchor="H6.FAQ"]].
641
642 * LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]]
643
644 There are two kinds of commands to configure LHT52, they are:
645
646 * (% style="color:#4f81bd" %)**General Commands:**
647
648 These commands are to configure:
649
650 * General system settings like: uplink interval.
651
652 * LoRaWAN protocol & radio-related commands.
653
654 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]]
655
656
657 * (% style="color:#4f81bd" %)**Commands special design for LHT52**
658
659 These commands are only valid for LHT52, as below:
660
661
662 == 3.1  Downlink Command Set ==
663
664
665 (% border="1" cellpadding="0" cellspacing="10" style="background-color:#ffffcc; color:green; width:500px" %)
666 |=(% style="width: 100px;" %)**Command Example**|=(% style="width: 150px;" %)**Function**|=(% style="width: 100px;" %)**Response**|=(% style="width: 150px;" %)**Downlink**
667 |(% style="width:161px" %)AT+TDC=?|(% style="width:138px" %)View current TDC time|(% style="width:243px" %)(((
668 1200000
669
670
671 OK
672 )))|(% style="width:1001px" %)Default 1200000(ms)
673 |(% style="width:161px" %)AT+TDC=300000|(% style="width:138px" %)Set TDC time|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
674 0X0100012C:
675
676 01:fixed command
677
678 00012C:0X00012C=300(seconds)
679 )))
680 |(% style="width:161px" %)ATZ|(% style="width:138px" %)Reset node|(% style="width:243px" %) |(% style="width:1001px" %)0x04FF
681 |(% style="width:161px" %)AT+FDR|(% style="width:138px" %)Restore factory settings|(% style="width:243px" %) |(% style="width:1001px" %)0X04FE
682 |(% style="width:161px" %)AT+CFM=?|(% style="width:138px" %)View the current confirmation mode status|(% style="width:243px" %)(((
683 0
684
685 OK
686 )))|(% style="width:1001px" %)Default 0
687 |(% style="width:161px" %)AT+CFM=1|(% style="width:138px" %)Turn on confirmation mode|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
688 0x0500:close
689
690 0x0501:open
691
692 05:fixed command
693 )))
694 |(% style="width:161px" %)AT+CHE=?|(% style="width:138px" %)View the current sub-band select 0-7, the default is 0|(% style="width:243px" %)(((
695 0
696
697 OK
698 )))|(% style="width:1001px" %)Default 0
699 |(% style="width:161px" %)AT+CHE=2|(% style="width:138px" %)(((
700 Set subband to 2
701
702 (CN470,US915,AU915)
703 )))|(% style="width:243px" %)(((
704 Attention:Take effect after ATZ
705
706 OK
707
708
709 )))|(% style="width:1001px" %)(((
710 0X0702:
711
712 07:fixed command
713
714 02:Select subband 2
715 )))
716 |(% style="width:161px" %)AT+WMOD=?|(% style="width:138px" %)View the current alarm mode status|(% style="width:243px" %)(((
717 0
718
719 OK
720 )))|(% style="width:1001px" %)Default 0
721 |(% style="width:161px" %)AT+WMOD=1|(% style="width:138px" %)Turn on alarm mode|(% style="width:243px" %)(((
722 Attention:Take effect after ATZ
723
724 OK
725
726
727 )))|(% style="width:1001px" %)(((
728 0xA501:open
729
730 0XA500:close
731
732 A5:fixed command
733
734
735 )))
736 |(% style="width:161px" %)AT+CITEMP=?|(% style="width:138px" %)View the current temperature detection time interval|(% style="width:243px" %)(((
737 1
738
739 OK
740 )))|(% style="width:1001px" %)Default 1(min)
741 |(% style="width:161px" %)AT+CITEMP=2|(% style="width:138px" %)Set the temperature detection time interval to 2min|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
742 0XA70002
743
744 A7:fixed command
745
746 0002:0X0002=2(min)
747 )))
748 |(% style="width:161px" %)AT+NJM=?|(% style="width:138px" %)Check the current network connection method|(% style="width:243px" %)(((
749 1
750
751 OK
752 )))|(% style="width:1001px" %)Default 1
753 |(% style="width:161px" %)AT+NJM=0|(% style="width:138px" %)Change the network connection method to ABP|(% style="width:243px" %)(((
754 Attention:Take effect after ATZ
755
756 OK
757
758
759 )))|(% style="width:1001px" %)(((
760 0X2000:ABP
761
762 0x2001:OTAA
763
764 20:fixed command
765
766
767 )))
768 |(% style="width:161px" %)AT+RPL=?|(% style="width:138px" %)View current RPL settings|(% style="width:243px" %)(((
769 0
770
771 OK
772 )))|(% style="width:1001px" %)Default 0
773 |(% style="width:161px" %)AT+RPL=1|(% style="width:138px" %)set RPL=1|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
774 0x2101:
775
776 21:fixed command
777
778 01:for details, check wiki
779 )))
780 |(% style="width:161px" %)AT+ADR=?|(% style="width:138px" %)View current ADR status|(% style="width:243px" %)(((
781 1
782
783 OK
784 )))|(% style="width:1001px" %)Default 0
785 |(% style="width:161px" %)AT+ADR=0|(% style="width:138px" %)Set the ADR state to off|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
786 0x2200:close
787
788 0x2201:open
789
790 22:fixed command
791 )))
792 |(% style="width:161px" %)AT+DR=?|(% style="width:138px" %)View the current DR settings|(% style="width:243px" %)OK|(% style="width:1001px" %)
793 |(% style="width:161px" %)AT+DR=1|(% style="width:138px" %)(((
794 set DR to 1
795
796 It takes effect only when ADR=0
797 )))|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
798 0X22000101:
799
800 00:ADR=0
801
802 01:DR=1
803
804 01:TXP=1
805
806 22:fixed command
807 )))
808 |(% style="width:161px" %)AT+TXP=?|(% style="width:138px" %)View the current TXP|(% style="width:243px" %)OK|(% style="width:1001px" %)
809 |(% style="width:161px" %)AT+TXP=1|(% style="width:138px" %)(((
810 set TXP to 1
811
812 It takes effect only when ADR=0
813 )))|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
814 0X22000101:
815
816 00:ADR=0
817
818 01:DR=1
819
820 01:TXP=1
821
822 22:fixed command
823 )))
824 |(% style="width:161px" %) |(% style="width:138px" %)Upload node configuration or DS18B20 ID|(% style="width:243px" %) |(% style="width:1001px" %)(((
825 0X2301:Upload node configuration
826
827 0x2302:Upload DS18B20 ID
828
829 23:fixed command
830 )))
831 |(% style="width:161px" %)AT+DWELL=?|(% style="width:138px" %)Check the high-rate upload settings|(% style="width:243px" %)(((
832 1
833
834 OK
835 )))|(% style="width:1001px" %)Default 1
836 |(% style="width:161px" %)AT+DWELL=1|(% style="width:138px" %)(((
837 Set high rate upload
838
839 (AS923,AU915)
840 )))|(% style="width:243px" %)(((
841 Attention:Take effect after ATZ
842
843 OK
844
845
846 )))|(% style="width:1001px" %)(((
847 0x2501:close
848
849 0x2500:open
850
851 25:fixed command
852
853 for details, check wiki
854 )))
855 |(% style="width:161px" %)AT+RJTDC=?|(% style="width:138px" %)View current RJTDC set time|(% style="width:243px" %)(((
856 20
857
858 OK
859 )))|(% style="width:1001px" %)Default 20(min)
860 |(% style="width:161px" %)AT+RJTDC=10|(% style="width:138px" %)Set RJTDC time interval|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
861 0X26000A:
862
863 26:fixed command
864
865 000A:0X000A=10(min)
866
867 for details, check wiki
868 )))
869 |(% style="width:161px" %) |(% style="width:138px" %)Retrieve stored data for a specified period of time|(% style="width:243px" %) |(% style="width:1001px" %)(((
870 0X3161DE7C7061DE8A800A:
871
872 31:fixed command
873
874 61DE7C70:0X61DE7C70=2022/1/12 15:00:00
875
876 61DE8A80:0X61DE8A80=2022/1/12 16:00:00
877
878 0A:0X0A=10(second)
879
880 View details 2.6.2
881 )))
882 |(% style="width:161px" %)AT+DDETECT=?|(% style="width:138px" %)View the current DDETECT setting status and time|(% style="width:243px" %)(((
883 0,1440
884
885 OK
886 )))|(% style="width:1001px" %)Default 0,1440(min)
887 |(% style="width:161px" %)AT+DDETECT=1,1440|(% style="width:138px" %)(((
888 Set DDETECT setting status and time
889
890 ((% style="color:red" %)When the node does not receive the downlink packet within the set time, it will re-enter the network(%%))
891 )))|(% style="width:243px" %)OK|(% style="width:1001px" %)(((
892 0X320005A0:close
893
894 0X320105A0:open
895
896 32:fixed command
897
898 05A0:0X05A0=1440(min)
899 )))
900 |(% style="width:161px" %) |(% style="width:138px" %)(((
901 Downlink Modification Alarm Mode
902
903 (AT+WMOD,AT+CITEMP,AT+ARTEMP)
904 )))|(% style="width:243px" %) |(% style="width:1001px" %)(((
905 0XAA010002000F00032:
906
907 AA:fixed command
908
909 01:0X01=1(AT+MOD)
910
911 0002:0X0002=2(AT+CITEMP)
912
913 000F:0X000F=15(AT+ARTEMP)
914
915 0032:0X0032=50(AT+ARTEMP)
916 )))
917
918
919
920
921 == 3.2  Set Password ==
922
923 Feature: Set device password, max 9 digits.
924
925 (% style="color:#4f81bd" %)**AT Command: AT+PWORD**
926
927 [[image:image-20220523151052-5.png||_mstalt="428623" _mstvisible="3"]]
928
929
930 (% style="color:#4f81bd" %)**Downlink Command:**
931
932 No downlink command for this feature.
933
934
935
936 = 4.  Battery & How to replace =
937
938 == 4.1  Battery Type and replace ==
939
940 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.
941
942 (% style="color:red" %)**Note: **
943
944 1.  The LHT52 doesn't have any screw, use can use nail to open it by the middle.
945
946 [[image:image-20220621143535-5.png]]
947
948
949 2.  Make sure the direction is correct when install the AAA batteries.
950
951 [[image:image-20220621143535-6.png]]
952
953
954
955 == 4.2  Power Consumption Analyze ==
956
957 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.
958
959 Instruction to use as below:
960
961 (% style="color:blue" %)**Step 1**(%%):  Downlink the up-to-date DRAGINO_Battery_Life_Prediction_Table.xlsx from:
962
963 [[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/]]
964
965
966 (% style="color:blue" %)**Step 2**(%%):  (% style="display:none" %) (%%)Open it and choose
967
968 * Product Model
969 * Uplink Interval
970 * Working Mode
971
972 And the Life expectation in difference case will be shown on the right.
973
974 [[image:image-20220621143643-7.png||height="429" width="1326"]]
975
976
977
978 = 5.  Sensors and Accessories =
979
980 == 5.1  Temperature Probe (AS-01) ==
981
982 External Temperature Probe base on DS18B20. (note: Default Package doesn't include AS-01)
983
984 [[image:image-20220621141939-4.png||height="315" width="279"]] [[image:image-20220621141546-2.png||height="308" width="205"]](% style="display:none" %)
985
986
987 **External Temperature Probe (AS-01):(% style="display:none" %) (%%)**
988
989 * Resolution: 0.0625 °C
990 * ±0.5°C accuracy from -10°C to +85°C
991 * ±2°C accuracy from -55°C to +125°C
992 * Operating Range: -55 °C ~~ 125 °C
993 * Cable Length: 2 meters
994
995
996
997
998
999 == 5.2  Program Converter (AS-02) ==
1000
1001 AS-02 is an optional accessory, it is USB Type-C converter. AS-02 provide below feature:
1002
1003 1. Access AT console of LHT52 when used with USB-TTL adapter. [[See this link>>path:#AT_COMMAND]].
1004 1. Update firmware to LHT52 when used with DAP-Link adapter. [[See this link>>url:https://wiki.dragino.com/index.php?title=Firmware_Upgrade_Instruction#LHT52]].
1005
1006 [[image:image-20220621141724-3.png]]
1007
1008
1009
1010 = 6. FAQ =
1011
1012 == 6.1 How to use AT Command to configure LHT52 ==
1013
1014 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.
1015
1016 [[image:image-20220621144150-8.png||height="537" width="724"]]
1017
1018
1019 **Connection:**
1020
1021 * (% style="background-color:yellow" %)USB to TTL GND <~-~-> Program Converter GND pin
1022 * (% style="background-color:yellow" %)USB to TTL RXD  <~-~-> Program Converter D+ pin
1023 * (% style="background-color:yellow" %)USB to TTL TXD  <~-~-> Program Converter A11 pin
1024
1025 It is also possible to connect using DAPLink
1026
1027 [[image:image-20220621144235-9.png||height="485" width="729"]]
1028
1029 (((
1030 **Connection:**
1031 )))
1032
1033 * (((
1034 (% style="background-color:yellow" %)USB to DAP-LINK GND <~-~-> Program Converter GND pin
1035 )))
1036 * (((
1037 (% style="background-color:yellow" %)USB to DAP-LINK RXD  <~-~-> Program Converter D+ pin
1038 )))
1039 * (((
1040 (% style="background-color:yellow" %)USB to DAP-LINK TXD  <~-~-> Program Converter A11 pin
1041 )))
1042
1043 (((
1044 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.
1045 )))
1046
1047 (((
1048 Input password and ATZ to activate LHT52,As shown below:
1049 )))
1050
1051
1052 [[image:image-20220621144235-10.png]]
1053
1054
1055
1056 == 6.2  AT Command and Downlink ==
1057
1058 (((
1059 Sending ATZ will reboot the node
1060 )))
1061
1062 (((
1063 Sending AT+FDR will restore the node to factory settings
1064 )))
1065
1066 (((
1067 Get the node's AT command setting by sending AT+CFG
1068 )))
1069
1070 (((
1071
1072 )))
1073
1074 (((
1075 **Example：**                                           
1076 )))
1077
1078 (((
1079 AT+VER=EU868 v1.0
1080 )))
1081
1082 (((
1083 AT+NJM=1          
1084 )))
1085
1086 (((
1087 AT+DEUI=25 32 12 45 65 26 12 35
1088 )))
1089
1090 (((
1091 AT+APPEUI=25 32 12 45 65 26 32 16
1092 )))
1093
1094 (((
1095 AT+APPKEY=25 32 12 45 65 26 32 16 89 48 85 65 45 87 89 55
1096 )))
1097
1098 (((
1099 AT+DADDR=00 00 00 00
1100 )))
1101
1102 (((
1103 AT+APPSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1104 )))
1105
1106 (((
1107 AT+NWKSKEY=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1108 )))
1109
1110 (((
1111 AT+NWKID=00 00 00 13
1112 )))
1113
1114 (((
1115 AT+ADR=1
1116 )))
1117
1118 (((
1119 AT+DR=5
1120 )))
1121
1122 (((
1123 AT+TXP=1
1124 )))
1125
1126 (((
1127 AT+CHS=0
1128 )))
1129
1130 (((
1131 AT+CLASS=A
1132 )))
1133
1134 (((
1135 AT+CFM=0
1136 )))
1137
1138 (((
1139 AT+JN1DL=5000
1140 )))
1141
1142 (((
1143 AT+JN2DL=6000
1144 )))
1145
1146 (((
1147 AT+RX1DL=5000
1148 )))
1149
1150 (((
1151 AT+RX2DL=6000
1152 )))
1153
1154 (((
1155 AT+RX1WTO=24
1156 )))
1157
1158 (((
1159 AT+RX2WTO=6
1160 )))
1161
1162 (((
1163 AT+RX2FQ=869525000
1164 )))
1165
1166 (((
1167 AT+RX2DR=0
1168 )))
1169
1170 (((
1171 AT+RPL=0
1172 )))
1173
1174 (((
1175 AT+FCU=6
1176 )))
1177
1178 (((
1179 AT+FCD=0
1180 )))
1181
1182 (((
1183 AT+CFS=0
1184 )))
1185
1186 (((
1187 AT+NJS=1
1188 )))
1189
1190 (((
1191 AT+DCS=0
1192 )))
1193
1194 (((
1195 AT+PNM=1
1196 )))
1197
1198 (((
1199 AT+PWORD=123456
1200 )))
1201
1202 (((
1203 AT+EXT=1
1204 )))
1205
1206 (((
1207 AT+TDC=120000
1208 )))
1209
1210 (((
1211 AT+TIMESTAMP=1640851037 2021 12 30 7 57 17
1212 )))
1213
1214 (((
1215 AT+RJTDC=20
1216 )))
1217
1218 (((
1219 AT+DDETECT=0,1440
1220 )))
1221
1222 (((
1223 AT+WMOD=0
1224 )))
1225
1226 (((
1227 AT+CITEMP=1
1228 )))
1229
1230 (((
1231 AT+ARTEMP=-40,125
1232 )))
1233
1234 (((
1235 Send AT+PDTA=? to get the stored 174 data
1236 )))
1237
1238
1239 (((
1240 **Example：**
1241 )))
1242
1243 [[image:image-20220621144804-11.png]]
1244
1245
1246
1247 == 6.3  How to upgrade the firmware? ==
1248
1249 LHT52 requires a program converter to upload images to LHT52, which is used to upload image to LHT52 for:
1250
1251 * Support new features
1252 * For bug fix
1253 * Change LoRaWAN bands.
1254
1255 (((
1256 User can check this link for the detail of operation of firmware upgrade: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1257 )))
1258
1259
1260
1261 == 6.4  How to change the LoRa Frequency Bands/Region? ==
1262
1263 User can follow the introduction for [[how to upgrade image>>||anchor="H6.3A0Howtoupgradethefirmware3F"]]. When download the images, choose the required image file for download.
1264
1265
1266
1267
1268 = 7. Order Info =
1269
1270 == 7.1  Main Device ==
1271
1272 (((
1273 Part Number: (% style="color:#4472c4" %)**LHT65N-XX**
1274 )))
1275
1276 (((
1277 (% style="color:#4472c4" %)**XX **(%%): The default frequency band
1278 )))
1279
1280 * (% style="color:red" %)**AS923**(%%)**: **LoRaWAN AS923 band
1281 * (% style="color:red" %)**AU915**(%%)**: **LoRaWAN AU915 band
1282 * (% style="color:red" %)**EU433**(%%)**: **LoRaWAN EU433 band
1283 * (% style="color:red" %)**EU868**(%%)**:** LoRaWAN EU868 band
1284 * (% style="color:red" %)**KR920**(%%)**: **LoRaWAN KR920 band
1285 * (% style="color:red" %)**US915**(%%)**: **LoRaWAN US915 band
1286 * (% style="color:red" %)**IN865**(%%)**:  **LoRaWAN IN865 band
1287 * (% style="color:red" %)**CN470**(%%)**: **LoRaWAN CN470 band
1288
1289
1290
1291
1292
1293 == 7.2  Accessories ==
1294
1295 (% style="color:red" %)Note: below accessories are not include in the main device package, need to order separately.
1296
1297 **Temperature Probe: (% style="color:red" %)AS-01(%%)**
1298
1299 **Program Converter: (% style="color:red" %)AS-02(%%)**
1300
1301
1302
1303 = 8. Packing Info =
1304
1305 **Package Includes**:
1306
1307 * LHT52 Temperature & Humidity Sensor x 1
1308
1309
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
1321
1322 = 10. FCC Warning =
1323
1324 This device complies with part 15 of the FCC Rules.Operation is subject to the following two conditions:
1325
1326 (1) This device may not cause harmful interference;
1327
1328 (2) this device must accept any interference received,including interference that may cause undesired operation.
1329 )))
1330 )))

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