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Version 175.11 by Xiaoling on 2022/06/15 10:58
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1 (% style="text-align:center" %)
2 [[image:1655254599445-662.png]]
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5
6
7 **Table of Contents:**
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15
16 = 1.  Introduction =
17
18 == 1.1 ​ What is LoRaWAN Ultrasonic liquid level Sensor ==
19
20 (((
21
22
23 (((
24 (((
25 (((
26 The Dragino LDDS20 is a (% style="color:#4472c4" %)**LoRaWAN Ultrasonic liquid level sensor**(%%) for Internet of Things solution. It uses (% style="color:#4472c4" %)**none-contact method **(%%)to measure the height of liquid in a container without opening the container, and send the value via LoRaWAN network to IoT Server
27 )))
28
29 (((
30
31 )))
32
33 (((
34 The LDDS20 sensor is installed directly below the container to detect the height of the liquid level. User doesn’t need to open a hole on the container to be tested. The (% style="color:#4472c4" %)**none-contact measurement makes the measurement safety, easier and possible for some strict situation**. 
35 )))
36
37 (((
38
39 )))
40
41 (((
42 LDDS20 uses ultrasonic sensing technology for distance measurement. LDDS20 is of high accuracy to measure various liquid such as: (% style="color:#4472c4" %)**toxic substances**(%%), (% style="color:#4472c4" %)**strong acids**(%%), (% style="color:#4472c4" %)**strong alkalis**(%%) and (% style="color:#4472c4" %)**various pure liquids**(%%) in high-temperature and high-pressure airtight containers.
43 )))
44
45 (((
46
47 )))
48
49 (((
50 The LoRa wireless technology used in LDDS20 allows device to send data and reach extremely long ranges at low data-rates. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption.
51 )))
52
53 (((
54
55 )))
56
57 (((
58 LDDS20 is powered by (% style="color:#4472c4" %)**8500mA Li-SOCI2 battery**(%%); It is designed for long term use up to 10 years*.
59 )))
60
61 (((
62
63 )))
64
65 (((
66 Each LDDS20 pre-loads with a set of unique keys for LoRaWAN registrations, register these keys to local LoRaWAN server and it will auto connect if there is network coverage, after power on.
67 )))
68
69 (((
70
71 )))
72 )))
73
74 (((
75 (((
76 (% style="color:#4472c4" %) * (%%)Actually lifetime depends on network coverage and uplink interval and other factors.
77 )))
78 )))
79 )))
80 )))
81
82
83 [[image:1655255122126-327.png]]
84
85
86
87 == ​1.2  Features ==
88
89 * LoRaWAN 1.0.3 Class A
90 * Ultra low power consumption
91 * Liquid Level Measurement by Ultrasonic technology
92 * Measure through container, No need to contact Liquid.
93 * Valid level range 20mm - 2000mm
94 * Accuracy: ±(5mm+S*0.5%) (S: Measure Value)
95 * Cable Length : 25cm
96 * Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865
97 * AT Commands to change parameters
98 * Uplink on periodically
99 * Downlink to change configure
100 * IP66 Waterproof Enclosure
101 * 8500mAh Battery for long term use
102
103 == 1.3  Suitable Container & Liquid ==
104
105 * Solid Wall container such as: steel, iron, glass, ceramics, non-foaming plastics etc.
106 * Container shape is regular, and surface is smooth.
107 * Container Thickness:
108 ** Pure metal material.  2~~8mm, best is 3~~5mm
109 ** Pure non metal material: <10 mm
110 * Pure liquid without irregular deposition.
111
112 == 1.4  Mechanical ==
113
114 [[image:image-20220615090910-1.png]]
115
116
117 [[image:image-20220615090910-2.png]]
118
119
120
121 == 1.5  Install LDDS20 ==
122
123
124 (% style="color:blue" %)**Step 1**(%%):  Choose the installation point.
125
126 LDDS20 (% style="color:red" %)**MUST**(%%) be installed on the container bottom middle position.
127
128 [[image:image-20220615091045-3.png]]
129
130
131
132 (% style="color:blue" %)**Step 2**(%%):  Polish the installation point.
133
134 For Metal Surface with paint, it is important to polish the surface, first use crude sand paper to polish the paint level , then use exquisite sand paper to polish the metal level to make it shine & smooth.
135
136 [[image:image-20220615092010-11.png]]
137
138
139 No polish needed if the container is shine metal surface without paint or non-metal container.
140
141 [[image:image-20220615092044-12.png]]
142
143
144
145 (% style="color:blue" %)**Step3:   **(%%)Test the installation point.
146
147 Power on LDDS75, check if the blue LED is on, If the blue LED is on, means the sensor works. Then put ultrasonic coupling paste on the sensor and put it tightly on the installation point.
148
149
150 It is necessary to put the coupling paste between the sensor and the container, otherwise LDDS20 won’t detect the liquid level.
151
152 [[image:1655256160324-178.png]][[image:image-20220615092327-13.png]]
153
154
155 After paste the LDDS20 well, power on LDDS20. In the first 30 seconds of booting, device will check the sensors status and BLUE LED will show the status as below. After 30 seconds, BLUE LED will be off to save battery life.
156
157
158 (% style="color:red" %)**LED Status:**
159
160 * Onboard LED: When power on device, the onboard LED will fast blink 4 times which means detect the sensor well.
161
162 * (% style="color:blue" %)BLUE LED(% style="color:red" %) always ON(%%): Sensor is power on but doesn’t detect liquid. There is problem in installation point.
163 * (% style="color:blue" %)BLUE LED(% style="color:red" %) slowly blinking(%%): Sensor detects Liquid Level, The installation point is good.
164
165 LDDS20 will enter into low power mode at 30 seconds after system reset or power on, Blue LED will be off after that.
166
167
168 (% style="color:red" %)**Note 2:**
169
170 (% style="color:red" %)Ultrasonic coupling paste (%%) is subjected in most shipping way. So the default package doesn’t include it and user needs to purchase locally.
171
172
173
174 (% style="color:blue" %)**Step4:   **(%%)Install use Epoxy ab glue.
175
176 Prepare Eproxy AB glue.
177
178 Put Eproxy AB glue in the sensor and press it hard on the container installation point.
179
180 Reset LDDS20 and see if the BLUE LED is slowly blinking.
181
182 [[image:image-20220615091045-8.png||height="226" width="380"]] [[image:image-20220615091045-9.png||height="239" width="339"]]
183
184
185 (% style="color:red" %)**Note 1:**
186
187 Eproxy AB glue needs 3~~ 5 minutes to stable attached. we can use other glue material to keep it in the position.
188
189
190 (% style="color:red" %)**Note 2:**
191
192 (% style="color:red" %)Eproxy AB glue(%%) is subjected in most shipping way. So the default package doesn’t include it and user needs to purchase locally.
193
194
195
196 == 1.6 ​ Applications ==
197
198 * Smart liquid control solution.
199 * Smart liquefied gas solution.
200
201 == 1.7  Precautions ==
202
203 * At room temperature, containers of different materials, such as steel, glass, iron, ceramics, non-foamed plastics and other dense materials, have different detection blind areas and detection limit heights.
204 * For containers of the same material at room temperature, the detection blind zone and detection limit height are also different for the thickness of the container.
205 * When the detected liquid level exceeds the effective detection value of the sensor, and the liquid level of the liquid to be measured shakes or tilts, the detected liquid height is unstable.
206
207 == 1.8  Pin mapping and power on ==
208
209
210 [[image:1655257026882-201.png]]
211
212
213
214 = 2.  Configure LDDS20 to connect to LoRaWAN network =
215
216
217 == 2.1  How it works ==
218
219 (((
220 The LDDS20 is configured as LoRaWAN OTAA Class A mode by default. It has OTAA keys to join LoRaWAN network. To connect a LoRaWAN network, you need to input the OTAA keys in the LoRaWAN IoT server and power on the LDDS20. If there is coverage of the LoRaWAN network, it will automatically join the network via OTAA and start to send the sensor value.
221 )))
222
223 (((
224 In case you can't set the OTAA keys in the LoRaWAN OTAA server, and you have to use the keys from the server, you can [[use AT Commands >>||anchor="H3.A0UsingtheATCommands"]]to set the keys in the LDDS20.
225 )))
226
227
228
229 == 2.2  ​Quick guide to connect to LoRaWAN server (OTAA) ==
230
231 (((
232 Following is an example for how to join the [[TTN v3 LoRaWAN Network>>url:https://console.cloud.thethings.network/]]. Below is the network structure; we use the [[LG308>>url:http://www.dragino.com/products/lora/item/140-lg308.html]] as a LoRaWAN gateway in this example.
233 )))
234
235 (((
236 [[image:1655257698953-697.png]]
237 )))
238
239 (((
240 The LG308 is already set to connected to [[TTN network >>url:https://console.cloud.thethings.network/]], so what we need to now is configure the TTN server.
241 )))
242
243 (((
244
245
246 (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LDDS20.
247 )))
248
249 (((
250 Each LDDS20 is shipped with a sticker with the default device keys, user can find this sticker in the box. it looks like below.
251 )))
252
253 [[image:image-20220607170145-1.jpeg]]
254
255
256 (((
257 For OTAA registration, we need to set **APP EUI/ APP KEY/ DEV EUI**. Some server might no need to set APP EUI.
258 )))
259
260 (((
261 Enter these keys in the LoRaWAN Server portal. Below is TTN V3 screen shot:
262 )))
263
264 (((
265
266
267 **Add APP EUI in the application**
268 )))
269
270 [[image:image-20220610161353-4.png]]
271
272 [[image:image-20220610161353-5.png]]
273
274 [[image:image-20220610161353-6.png]]
275
276
277 [[image:image-20220610161353-7.png]]
278
279
280
281 You can also choose to create the device manually.
282
283 [[image:image-20220610161538-8.png]]
284
285
286
287 **Add APP KEY and DEV EUI**
288
289 [[image:image-20220610161538-9.png]]
290
291
292
293 (% style="color:blue" %)**Step 2**(%%):  Power on LDDS20
294
295
296 Put a Jumper on JP2 to power on the device. ( The Switch must be in FLASH position).
297
298 [[image:image-20220615095102-14.png]]
299
300
301
302 (((
303 (% style="color:blue" %)**Step 3**(%%)**:**  The LDDS20 will auto join to the TTN network. After join success, it will start to upload messages to TTN and you can see the messages in the panel.
304 )))
305
306 [[image:1654849068701-275.png]]
307
308
309
310 == 2.3  ​Uplink Payload ==
311
312 (((
313 (((
314 LDDS20 will uplink payload via LoRaWAN with below payload format: 
315
316 Uplink payload includes in total 8 bytes.
317 Payload for firmware version v1.1.4. . Before v1.1.3, there is only 5 bytes: BAT and Distance(Please check manual v1.2.0 if you have 5 bytes payload).
318 )))
319 )))
320
321 (((
322
323 )))
324
325 (% border="1" cellspacing="10" style="background-color:#ffffcc; width:510px" %)
326 |=(% style="width: 62.5px;" %)(((
327 **Size (bytes)**
328 )))|=(% style="width: 62.5px;" %)**2**|=**2**|=1|=2|=**1**
329 |(% style="width:62.5px" %)**Value**|(% style="width:62.5px" %)[[BAT>>||anchor="H2.3.1A0BatteryInfo"]]|(((
330 [[Distance>>||anchor="H2.3.2A0Distance"]]
331
332 (unit: mm)
333 )))|[[Digital Interrupt (Optional)>>||anchor="H2.3.3A0InterruptPin"]]|(((
334 [[Temperature (Optional )>>||anchor="H2.3.4A0DS18B20Temperaturesensor"]]
335 )))|[[Sensor Flag>>||anchor="H2.3.5A0SensorFlag"]]
336
337 [[image:1654850511545-399.png]]
338
339
340
341 === 2.3.1  Battery Info ===
342
343
344 Check the battery voltage for LDDS20.
345
346 Ex1: 0x0B45 = 2885mV
347
348 Ex2: 0x0B49 = 2889mV
349
350
351
352 === 2.3.2  Distance ===
353
354 (((
355 Get the distance. Flat object range 20mm - 2000mm.
356 )))
357
358 (((
359 For example, if the data you get from the register is __0x06 0x05__, the distance between the sensor and the measured object is(% style="color:#4472c4" %)** 0605(H) = 1541 (D) = 1541 mm.**
360 )))
361
362 * If the sensor value is 0x0000, it means system doesn't detect ultrasonic sensor.
363 * If the sensor value lower than 0x0014 (20mm), the sensor value will be invalid.
364
365 === 2.3.3  Interrupt Pin ===
366
367 This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H3.2A0SetInterruptMode"]] for the hardware and software set up.
368
369 **Example:**
370
371 0x00: Normal uplink packet.
372
373 0x01: Interrupt Uplink Packet.
374
375
376
377 === 2.3.4  DS18B20 Temperature sensor ===
378
379 This is optional, user can connect external DS18B20 sensor to the +3.3v, 1-wire and GND pin . and this field will report temperature.
380
381 **Example**:
382
383 If payload is: 0105H:  (0105 & FC00 == 0), temp = 0105H /10 = 26.1 degree
384
385 If payload is: FF3FH :  (FF3F & FC00 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees.
386
387 (% style="color:red" %)Note: DS18B20 feature is supported in the hardware version > v1.3 which made since early of 2021.
388
389
390
391 === 2.3.5  Sensor Flag ===
392
393 (((
394 0x01: Detect Ultrasonic Sensor
395 )))
396
397 (((
398 0x00: No Ultrasonic Sensor
399 )))
400
401
402
403 === 2.3.6  Decode payload in The Things Network ===
404
405 While using TTN network, you can add the payload format to decode the payload.
406
407
408 [[image:1655261164557-670.png]]
409
410 The payload decoder function for TTN V3 is here:
411
412 (((
413 LDDS20 TTN V3 Payload Decoder: [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LDDS20/Payload_Decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Payload_Decoder/]]
414 )))
415
416
417
418 == 2.4  Downlink Payload ==
419
420 By default, LDDS20 prints the downlink payload to console port.
421
422 [[image:image-20220615100930-15.png]]
423
424
425 **Examples:**
426
427
428 * (% style="color:blue" %)**Set TDC**
429
430 If the payload=0100003C, it means set the END Node's TDC to 0x00003C=60(S), while type code is 01.
431
432 Payload:    01 00 00 1E    TDC=30S
433
434 Payload:    01 00 00 3C    TDC=60S
435
436
437 * (% style="color:blue" %)**Reset**
438
439 If payload = 0x04FF, it will reset the LDDS20
440
441
442 * (% style="color:blue" %)**CFM**
443
444 Downlink Payload: 05000001, Set AT+CFM=1 or 05000000 , set AT+CFM=0
445
446
447
448 == 2.5  ​Show Data in DataCake IoT Server ==
449
450 (((
451 [[DATACAKE>>url:https://datacake.co/]] provides a human friendly interface to show the sensor data, once we have data in TTN, we can use [[DATACAKE>>url:https://datacake.co/]] to connect to TTN and see the data in DATACAKE. Below are the steps:
452 )))
453
454 (((
455
456 )))
457
458 (((
459 (% style="color:blue" %)**Step 1**(%%)**: Be sure that your device is programmed and properly connected to the network at this time.**
460 )))
461
462 (((
463 (% style="color:blue" %)**Step 2**(%%)**: To configure the Application to forward data to DATACAKE you will need to add integration. To add the DATACAKE integration, perform the following steps:**
464 )))
465
466
467 [[image:1654592790040-760.png]]
468
469
470 [[image:1654592800389-571.png]]
471
472
473 (% style="color:blue" %)**Step 3**(%%)**: Create an account or log in Datacake.**
474
475 (% style="color:blue" %)**Step 4**(%%)**: Search the LDDS75 and add DevEUI.(% style="color:red" %)(Note: LDDS20 use same payload as LDDS75)(%%)**
476
477 [[image:1654851029373-510.png]]
478
479
480 After added, the sensor data arrive TTN V3, it will also arrive and show in Datacake.
481
482 [[image:image-20220610165129-11.png||height="595" width="1088"]]
483
484
485
486 == 2.6  LED Indicator ==
487
488 The LDDS20 has an internal LED which is to show the status of different state.
489
490
491 * Blink once when device power on.
492 * The device detects the sensor and flashes 5 times.
493 * Solid ON for 5 seconds once device successful Join the network.
494 * Blink once when device transmit a packet.
495
496 == 2.7  ​Firmware Change Log ==
497
498
499 (((
500 **Firmware download link:  **[[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Firmware/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/Firmware/]]
501 )))
502
503 (((
504
505 )))
506
507 (((
508 **Firmware Upgrade Method:  [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]**
509 )))
510
511
512
513 == 2.8  Battery Analysis ==
514
515
516
517
518 === 2.8.1  Battery Type ===
519
520 The LDDS20 battery is a combination of a 8500mAh Li/SOCI2 Battery and a Super Capacitor. The battery is non-rechargeable battery type with a low discharge rate (<2% per year). This type of battery is commonly used in IoT devices such as water meter.
521
522
523 The battery related documents as below:
524
525 * (((
526 [[Battery Dimension>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]],
527 )))
528 * (((
529 [[Lithium-Thionyl Chloride Battery  datasheet>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]],
530 )))
531 * (((
532 [[Lithium-ion Battery-Capacitor datasheet>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]
533 )))
534
535 [[image:image-20220615102527-16.png]]
536
537
538
539 == 2.8.2  Battery Note ==
540
541 The Li-SICO battery is designed for small current / long period application. It is not good to use a high current, short period transmit method. The recommended minimum period for use of this battery is 5 minutes. If you use a shorter period time to uplink data, then the battery life may be decreased.
542
543
544
545 === 2.8.3  Replace the battery ===
546
547 (((
548 You can change the battery in the LDDS75.The type of battery is not limited as long as the output is between 3v to 3.6v. On the main board, there is a diode (D1) between the battery and the main circuit. If you need to use a battery with less than 3.3v, please remove the D1 and shortcut the two pads of it so there won't be voltage drop between battery and main board.
549 )))
550
551 (((
552
553 )))
554
555 (((
556 The default battery pack of LDDS75 includes a ER18505 plus super capacitor. If user can't find this pack locally, they can find ER18505 or equivalence, which will also work in most case. The SPC can enlarge the battery life for high frequency use (update period below 5 minutes)
557 )))
558
559
560
561 == 2.8.4  Battery Life Analyze ==
562
563 Dragino battery powered products are all run in Low Power mode. User can check the guideline from this link to calculate the estimate battery life:
564
565 [[https:~~/~~/www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf>>url:https://www.dragino.com/downloads/downloads/LoRa_End_Node/Battery_Analyze/DRAGINO_Battery_Life_Guide.pdf]]
566
567
568
569 = 3.  Using the AT Commands =
570
571 (((
572 (((
573
574 )))
575 )))
576
577 == 3.1  Access AT Commands ==
578
579 LDDS20 supports AT Command set in the stock firmware. You can use a USB to TTL adapter to connect to LDDS20 for using AT command, as below.
580
581
582 [[image:image-20220610172924-4.png||height="483" width="988"]]
583
584
585 Or if you have below board, use below connection:
586
587
588 [[image:image-20220610172924-5.png]]
589
590
591 (((
592 In the PC, you need to set the serial baud rate to (% style="color:green" %)**9600**(%%) to access the serial console for LDDS20. LDDS20 will output system info once power on as below:
593 )))
594
595
596 [[image:image-20220610172924-6.png||height="601" width="860"]]
597
598 Below are the available commands, a more detailed AT Command manual can be found at [[AT Command Manual>>https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LSE01/]].
599
600
601 AT+<CMD>?  :  Help on <CMD>
602
603 AT+<CMD>  :  Run <CMD>
604
605 AT+<CMD>=<value>  :  Set the value
606
607 AT+<CMD>=?  :  Get the value
608
609
610 (% style="color:#037691" %)** General Commands :**     
611
612 AT  :  Attention       
613
614 AT?  :  Short Help     
615
616 ATZ :  MCU Reset    
617
618 AT+TDC :  Application Data Transmission Interval 
619
620
621 (% style="color:#037691" %)** Keys, IDs and EUIs management :**
622
623 AT+APPEUI  :  Application EUI      
624
625 AT+APPKEY  :  Application Key     
626
627 AT+APPSKEY  :  Application Session Key
628
629 AT+DADDR :  Device Address     
630
631 AT+DEUI :  Device EUI     
632
633 AT+NWKID  :  Network ID (You can enter this command change only after successful network connection) 
634
635 AT+NWKSKEY  : Network Session Key Joining and sending date on LoRa network  
636
637 AT+CFM :  Confirm Mode       
638
639 AT+CFS :  Confirm Status       
640
641 AT+JOIN  :  Join LoRa? Network       
642
643 AT+NJM  :  LoRa? Network Join Mode    
644
645 AT+NJS  :  LoRa? Network Join Status    
646
647 AT+RECV  :  Print Last Received Data in Raw Format
648
649 AT+RECVB :  Print Last Received Data in Binary Format      
650
651 AT+SEND  :  Send Text Data      
652
653 AT+SENB  :  Send Hexadecimal Data
654
655
656 (% style="color:#037691" %)** LoRa Network Management :**
657
658 AT+ADR  :  Adaptive Rate
659
660 AT+CLASS  :  LoRa Class(Currently only support class A
661
662 AT+DCS  :  Duty Cycle Setting 
663
664 AT+DR  :  Data Rate (Can Only be Modified after ADR=0)     
665
666 AT+FCD  :  Frame Counter Downlink       
667
668 AT+FCU  :  Frame Counter Uplink   
669
670 AT+JN1DL  :  Join Accept Delay1
671
672 AT+JN2DL  :  Join Accept Delay2
673
674 AT+PNM  :  Public Network Mode   
675
676 AT+RX1DL  :  Receive Delay1      
677
678 AT+RX2DL  :  Receive Delay2      
679
680 AT+RX2DR  :  Rx2 Window Data Rate 
681
682 AT+RX2FQ  :  Rx2 Window Frequency
683
684 AT+TXP  :  Transmit Power
685
686
687 (% style="color:#037691" %)** Information :**
688
689 AT+RSSI  :  RSSI of the Last Received Packet   
690
691 AT+SNR  :  SNR of the Last Received Packet   
692
693 AT+VER  :  Image Version and Frequency Band       
694
695 AT+FDR  :  Factory Data Reset
696
697 AT+PORT  :  Application Port    
698
699 AT+CHS  :  Get or Set Frequency (Unit: Hz) for Single Channel Mode
700
701 AT+CHE  :  Get or Set eight channels mode, Only for US915, AU915, CN470
702
703
704
705 == 3.2  Set Interrupt Mode ==
706
707 Feature, Set Interrupt mode for GPIO_EXIT.
708
709 (% style="color:#037691" %)**Downlink Command: AT+INTMOD**
710
711 [[image:image-20220610174917-9.png]]
712
713
714 (% style="color:#037691" %)**Downlink Command: 0x06**
715
716 Format: Command Code (0x06) followed by 3 bytes.
717
718 (((
719 This means that the interrupt mode of the end node is set to 0x000003=3 (rising edge trigger), and the type code is 06.
720 )))
721
722 * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
723 * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
724
725
726 = 4.  FAQ =
727
728 == 4.1  What is the frequency plan for LDDS20? ==
729
730 LDDS20 use the same frequency as other Dragino products. User can see the detail from this link:  [[Introduction>>doc:Main.End Device Frequency Band.WebHome||anchor="H1.Introduction"]]
731
732
733
734 == 4.2  How to change the LoRa Frequency Bands/Region ==
735
736 You can follow the instructions for [[how to upgrade image>>||anchor="H2.7A0200BFirmwareChangeLog"]].
737 When downloading the images, choose the required image file for download. ​
738
739
740
741 == 4.3  Can I use LDDS75 in condensation environment? ==
742
743 LDDS75 is not suitable to be used in condensation environment. Condensation on the LDDS75 probe will affect the reading and always got 0.
744
745
746
747 = 5.  Trouble Shooting =
748
749 == 5.1  Why I can’t join TTN V3 in US915 / AU915 bands? ==
750
751 It is due to channel mapping. Please see below link:  [[Frequency band>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
752
753
754 == 5.2  AT Command input doesn't work ==
755
756 In the case if user can see the console output but can’t type input to the device. Please check if you already include the (% style="color:green" %)**ENTER**(%%) while sending out the command. Some serial tool doesn’t send (% style="color:green" %)**ENTER**(%%) while press the send key, user need to add ENTER in their string.
757
758 (((
759
760 )))
761
762
763 = 6.  Order Info =
764
765
766 Part Number **:** (% style="color:blue" %)**LDDS75-XX-YY**
767
768
769 (% style="color:blue" %)**XX**(%%)**: **The default frequency band
770
771 * (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band
772 * (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band
773 * (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band
774 * (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band
775 * (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band
776 * (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band
777 * (% style="color:red" %)**IN865 **(%%)**:**  LoRaWAN IN865 band
778 * (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band
779
780 (% style="color:blue" %)**YY**(%%): Battery Option
781
782 * (% style="color:red" %)**4 **(%%)**: **4000mAh battery
783 * (% style="color:red" %)**8 **(%%)**:** 8500mAh battery
784
785 = 7. ​ Packing Info =
786
787
788 **Package Includes**:
789
790 * LDDS75 LoRaWAN Distance Detection Sensor x 1
791
792 **Dimension and weight**:
793
794 * Device Size: cm
795 * Device Weight: g
796 * Package Size / pcs : cm
797 * Weight / pcs : g
798
799 = 8.  ​Support =
800
801 * 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.
802 * 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:http://../../../../../../D:%5C%E5%B8%82%E5%9C%BA%E8%B5%84%E6%96%99%5C%E8%AF%B4%E6%98%8E%E4%B9%A6%5CLoRa%5CLT%E7%B3%BB%E5%88%97%5Csupport@dragino.com]].