Skip to Content
Version 175.7 by Xiaoling on 2022/06/15 10:54
Show last authors
1 (% style="text-align:center" %)
2 [[image:1655254599445-662.png]]
3
4
5
6
7 **Table of Contents:**
8
9
10
11
12
13
14
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
366 === 2.3.3  Interrupt Pin ===
367
368 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.
369
370 **Example:**
371
372 0x00: Normal uplink packet.
373
374 0x01: Interrupt Uplink Packet.
375
376
377
378 === 2.3.4  DS18B20 Temperature sensor ===
379
380 This is optional, user can connect external DS18B20 sensor to the +3.3v, 1-wire and GND pin . and this field will report temperature.
381
382 **Example**:
383
384 If payload is: 0105H:  (0105 & FC00 == 0), temp = 0105H /10 = 26.1 degree
385
386 If payload is: FF3FH :  (FF3F & FC00 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees.
387
388 (% style="color:red" %)Note: DS18B20 feature is supported in the hardware version > v1.3 which made since early of 2021.
389
390
391
392 === 2.3.5  Sensor Flag ===
393
394 (((
395 0x01: Detect Ultrasonic Sensor
396 )))
397
398 (((
399 0x00: No Ultrasonic Sensor
400 )))
401
402
403
404 === 2.3.6  Decode payload in The Things Network ===
405
406 While using TTN network, you can add the payload format to decode the payload.
407
408
409 [[image:1655261164557-670.png]]
410
411 The payload decoder function for TTN V3 is here:
412
413 (((
414 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/]]
415 )))
416
417
418
419 == 2.4  Downlink Payload ==
420
421 By default, LDDS20 prints the downlink payload to console port.
422
423 [[image:image-20220615100930-15.png]]
424
425
426 **Examples:**
427
428
429 * (% style="color:blue" %)**Set TDC**
430
431 If the payload=0100003C, it means set the END Node's TDC to 0x00003C=60(S), while type code is 01.
432
433 Payload:    01 00 00 1E    TDC=30S
434
435 Payload:    01 00 00 3C    TDC=60S
436
437
438 * (% style="color:blue" %)**Reset**
439
440 If payload = 0x04FF, it will reset the LDDS20
441
442
443 * (% style="color:blue" %)**CFM**
444
445 Downlink Payload: 05000001, Set AT+CFM=1 or 05000000 , set AT+CFM=0
446
447
448
449 == 2.5  ​Show Data in DataCake IoT Server ==
450
451 (((
452 [[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:
453 )))
454
455 (((
456
457 )))
458
459 (((
460 (% style="color:blue" %)**Step 1**(%%)**: Be sure that your device is programmed and properly connected to the network at this time.**
461 )))
462
463 (((
464 (% 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:**
465 )))
466
467
468 [[image:1654592790040-760.png]]
469
470
471 [[image:1654592800389-571.png]]
472
473
474 (% style="color:blue" %)**Step 3**(%%)**: Create an account or log in Datacake.**
475
476 (% style="color:blue" %)**Step 4**(%%)**: Search the LDDS75 and add DevEUI.(% style="color:red" %)(Note: LDDS20 use same payload as LDDS75)(%%)**
477
478 [[image:1654851029373-510.png]]
479
480
481 After added, the sensor data arrive TTN V3, it will also arrive and show in Datacake.
482
483 [[image:image-20220610165129-11.png||height="595" width="1088"]]
484
485
486
487 == 2.6  LED Indicator ==
488
489 The LDDS20 has an internal LED which is to show the status of different state.
490
491
492 * Blink once when device power on.
493 * The device detects the sensor and flashes 5 times.
494 * Solid ON for 5 seconds once device successful Join the network.
495 * Blink once when device transmit a packet.
496
497
498 == 2.7  ​Firmware Change Log ==
499
500
501 (((
502 **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/]]
503 )))
504
505 (((
506
507 )))
508
509 (((
510 **Firmware Upgrade Method:  [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]**
511 )))
512
513
514
515 == 2.8  Battery Analysis ==
516
517
518
519
520 === 2.8.1  Battery Type ===
521
522 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.
523
524
525 The battery related documents as below:
526
527 * (((
528 [[Battery Dimension>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]],
529 )))
530 * (((
531 [[Lithium-Thionyl Chloride Battery  datasheet>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]],
532 )))
533 * (((
534 [[Lithium-ion Battery-Capacitor datasheet>>https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]
535 )))
536
537 [[image:image-20220615102527-16.png]]
538
539
540
541 == 2.8.2  Battery Note ==
542
543 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.
544
545
546
547 === 2.8.3  Replace the battery ===
548
549 (((
550 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.
551 )))
552
553 (((
554
555 )))
556
557 (((
558 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)
559 )))
560
561
562
563 == 2.8.4  Battery Life Analyze ==
564
565 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:
566
567 [[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]]
568
569
570
571 = 3.  Using the AT Commands =
572
573 (((
574 (((
575
576 )))
577 )))
578
579 == 3.1  Access AT Commands ==
580
581 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.
582
583
584 [[image:image-20220610172924-4.png||height="483" width="988"]]
585
586
587 Or if you have below board, use below connection:
588
589
590 [[image:image-20220610172924-5.png]]
591
592
593 (((
594 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:
595 )))
596
597
598 [[image:image-20220610172924-6.png||height="601" width="860"]]
599
600 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/]].
601
602
603 AT+<CMD>?  :  Help on <CMD>
604
605 AT+<CMD>  :  Run <CMD>
606
607 AT+<CMD>=<value>  :  Set the value
608
609 AT+<CMD>=?  :  Get the value
610
611
612 (% style="color:#037691" %)** General Commands :**     
613
614 AT  :  Attention       
615
616 AT?  :  Short Help     
617
618 ATZ :  MCU Reset    
619
620 AT+TDC :  Application Data Transmission Interval 
621
622
623 (% style="color:#037691" %)** Keys, IDs and EUIs management :**
624
625 AT+APPEUI  :  Application EUI      
626
627 AT+APPKEY  :  Application Key     
628
629 AT+APPSKEY  :  Application Session Key
630
631 AT+DADDR :  Device Address     
632
633 AT+DEUI :  Device EUI     
634
635 AT+NWKID  :  Network ID (You can enter this command change only after successful network connection) 
636
637 AT+NWKSKEY  : Network Session Key Joining and sending date on LoRa network  
638
639 AT+CFM :  Confirm Mode       
640
641 AT+CFS :  Confirm Status       
642
643 AT+JOIN  :  Join LoRa? Network       
644
645 AT+NJM  :  LoRa? Network Join Mode    
646
647 AT+NJS  :  LoRa? Network Join Status    
648
649 AT+RECV  :  Print Last Received Data in Raw Format
650
651 AT+RECVB :  Print Last Received Data in Binary Format      
652
653 AT+SEND  :  Send Text Data      
654
655 AT+SENB  :  Send Hexadecimal Data
656
657
658 (% style="color:#037691" %)** LoRa Network Management :**
659
660 AT+ADR  :  Adaptive Rate
661
662 AT+CLASS  :  LoRa Class(Currently only support class A
663
664 AT+DCS  :  Duty Cycle Setting 
665
666 AT+DR  :  Data Rate (Can Only be Modified after ADR=0)     
667
668 AT+FCD  :  Frame Counter Downlink       
669
670 AT+FCU  :  Frame Counter Uplink   
671
672 AT+JN1DL  :  Join Accept Delay1
673
674 AT+JN2DL  :  Join Accept Delay2
675
676 AT+PNM  :  Public Network Mode   
677
678 AT+RX1DL  :  Receive Delay1      
679
680 AT+RX2DL  :  Receive Delay2      
681
682 AT+RX2DR  :  Rx2 Window Data Rate 
683
684 AT+RX2FQ  :  Rx2 Window Frequency
685
686 AT+TXP  :  Transmit Power
687
688
689 (% style="color:#037691" %)** Information :**
690
691 AT+RSSI  :  RSSI of the Last Received Packet   
692
693 AT+SNR  :  SNR of the Last Received Packet   
694
695 AT+VER  :  Image Version and Frequency Band       
696
697 AT+FDR  :  Factory Data Reset
698
699 AT+PORT  :  Application Port    
700
701 AT+CHS  :  Get or Set Frequency (Unit: Hz) for Single Channel Mode
702
703 AT+CHE  :  Get or Set eight channels mode, Only for US915, AU915, CN470
704
705
706
707 == 3.2  Set Transmit Interval Time ==
708
709 Feature: Change LoRaWAN End Node Transmit Interval.
710
711 (% style="color:#037691" %)**AT Command: AT+TDC**
712
713 [[image:image-20220610173409-7.png]]
714
715
716 (((
717 (% style="color:#037691" %)**Downlink Command: 0x01**
718 )))
719
720 (((
721 (((
722 Format: Command Code (0x01) followed by 3 bytes time value.
723
724 (((
725 If the downlink payload=0100003C, it means set the END Node’s Transmit Interval to 0x00003C=60(S), while type code is 01.
726 )))
727
728 * Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
729 * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
730 )))
731 )))
732
733
734
735
736
737 == 3.3  Set Interrupt Mode ==
738
739 Feature, Set Interrupt mode for GPIO_EXIT.
740
741 (% style="color:#037691" %)**Downlink Command: AT+INTMOD**
742
743 [[image:image-20220610174917-9.png]]
744
745
746 (% style="color:#037691" %)**Downlink Command: 0x06**
747
748 Format: Command Code (0x06) followed by 3 bytes.
749
750 (((
751 This means that the interrupt mode of the end node is set to 0x000003=3 (rising edge trigger), and the type code is 06.
752 )))
753
754 * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
755 * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
756
757 = 4.  FAQ =
758
759 == 4.1  What is the frequency plan for LDDS75? ==
760
761 LDDS75 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"]]
762
763
764
765 == 4.2  How to change the LoRa Frequency Bands/Region ==
766
767 You can follow the instructions for [[how to upgrade image>>||anchor="H2.8A0200BFirmwareChangeLog"]].
768 When downloading the images, choose the required image file for download. ​
769
770
771
772 == 4.3  Can I use LDDS75 in condensation environment? ==
773
774 LDDS75 is not suitable to be used in condensation environment. Condensation on the LDDS75 probe will affect the reading and always got 0.
775
776
777
778 = 5.  Trouble Shooting =
779
780 == 5.1  Why I can’t join TTN V3 in US915 / AU915 bands? ==
781
782 It is due to channel mapping. Please see below link:  [[Frequency band>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
783
784
785 == 5.2  AT Command input doesn't work ==
786
787 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.
788
789 (((
790
791 )))
792
793
794 = 6.  Order Info =
795
796
797 Part Number **:** (% style="color:blue" %)**LDDS75-XX-YY**
798
799
800 (% style="color:blue" %)**XX**(%%)**: **The default frequency band
801
802 * (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band
803 * (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band
804 * (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band
805 * (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band
806 * (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band
807 * (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band
808 * (% style="color:red" %)**IN865 **(%%)**:**  LoRaWAN IN865 band
809 * (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band
810
811 (% style="color:blue" %)**YY**(%%): Battery Option
812
813 * (% style="color:red" %)**4 **(%%)**: **4000mAh battery
814 * (% style="color:red" %)**8 **(%%)**:** 8500mAh battery
815
816 = 7. ​ Packing Info =
817
818
819 **Package Includes**:
820
821 * LDDS75 LoRaWAN Distance Detection Sensor x 1
822
823 **Dimension and weight**:
824
825 * Device Size: cm
826 * Device Weight: g
827 * Package Size / pcs : cm
828 * Weight / pcs : g
829
830 = 8.  ​Support =
831
832 * 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.
833 * 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]].