Last modified by Mengting Qiu on 2024/04/02 16:54
<
From version < 33.9 >
edited by Xiaoling
on 2022/09/23 17:22
To version < 42.1 >
edited by Bei Jinggeng
on 2024/03/30 17:56
>
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Summary

Details

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Author
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1 -XWiki.Xiaoling
1 +XWiki.Bei
Content
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1 +
2 +
1 1  (% style="text-align:center" %)
2 2  [[image:image-20220907171221-1.jpeg]]
3 3  
4 4  ​
5 5  
8 +
9 +
10 +
11 +
12 +
6 6  {{toc/}}
7 7  
8 8  
... ... @@ -9,20 +9,24 @@
9 9  
10 10  = 1.  Introduction =
11 11  
12 -
13 13  == 1.1 ​ What is NLMS01 Leaf Moisture Sensor ==
14 14  
15 15  
22 +(((
16 16  The Dragino NLMS01 is a (% style="color:blue" %)**NB-IOT Leaf Moisture Sensor**(%%) for IoT of Agriculture. It is designed to measure the leaf moisture and temperature, so to send to the platform to analyze the leaf status such as : watering, moisturizing, dew, frozen. The probe is IP67 waterproof.
17 17  
18 18  NLMS01 detects leaf's(% style="color:blue" %)** moisture and temperature use FDR method**(%%), it senses the dielectric constant cause by liquid over the leaf surface, and cover the value to leaf moisture. The probe is design in a leaf shape to best simulate the real leaf characterizes. The probe has as density as 15 leaf vein lines per centimeter which make it can senses small drop and more accuracy.
19 19  
20 20  NarrowBand-Internet of Things (NB-IoT) is a standards-based low power wide area (LPWA) technology developed to enable a wide range of new IoT devices and services. NB-IoT significantly improves the power consumption of user devices, system capacity and spectrum efficiency, especially in deep coverage.
21 -\\NLMS01 supports different uplink methods include (% style="color:blue" %)**TCP,MQTT,UDP and CoAP  **(%%)for different application requirement.
22 -\\NLMS01 is powered by  (% style="color:blue" %)**8500mAh Li-SOCI2 battery**(%%), It is designed for long term use up to 5 years. (Actually Battery life depends on the use environment, update period & uplink method).
23 -\\To use NLMS01, user needs to check if there is NB-IoT coverage in local area and with the bands NLMS01 supports. If the local operate support it, user needs to get a (% style="color:blue" %)**NB-IoT SIM card**(%%) from local operator and install NLMS01 to get NB-IoT network connection.
24 24  
29 +NLMS01 supports different uplink methods include (% style="color:blue" %)**TCP,MQTT,UDP and CoAP  **(%%)for different application requirement.
25 25  
31 +NLMS01 is powered by  (% style="color:blue" %)**8500mAh Li-SOCI2 battery**(%%), It is designed for long term use up to 5 years. (Actually Battery life depends on the use environment, update period & uplink method).
32 +
33 +To use NLMS01, user needs to check if there is NB-IoT coverage in local area and with the bands NLMS01 supports. If the local operate support it, user needs to get a (% style="color:blue" %)**NB-IoT SIM card**(%%) from local operator and install NLMS01 to get NB-IoT network connection.
34 +)))
35 +
36 +
26 26  ​[[image:image-20220907171221-2.png]]
27 27  
28 28  
... ... @@ -29,7 +29,6 @@
29 29  ​ [[image:image-20220907171221-3.png]]
30 30  
31 31  
32 -
33 33  == ​1.2  Features ==
34 34  
35 35  
... ... @@ -50,7 +50,6 @@
50 50  (((
51 51  
52 52  
53 -
54 54  
55 55  )))
56 56  
... ... @@ -64,15 +64,13 @@
64 64  
65 65  (% style="color:#037691" %)**NB-IoT Spec:**
66 66  
67 -* - B1 @H-FDD: 2100MHz
68 -* - B3 @H-FDD: 1800MHz
69 -* - B8 @H-FDD: 900MHz
70 -* - B5 @H-FDD: 850MHz
71 -* - B20 @H-FDD: 800MHz
72 -* - B28 @H-FDD: 700MHz
76 +* B1 @H-FDD: 2100MHz
77 +* B3 @H-FDD: 1800MHz
78 +* B8 @H-FDD: 900MHz
79 +* B5 @H-FDD: 850MHz
80 +* B20 @H-FDD: 800MHz
81 +* B28 @H-FDD: 700MHz
73 73  
74 -
75 -
76 76  == 1.4  Probe Specification ==
77 77  
78 78  
... ... @@ -92,15 +92,11 @@
92 92  * IP67 Protection
93 93  * Length: 3.5 meters
94 94  
95 -
96 -
97 97  == 1.5 ​ Applications ==
98 98  
99 99  
100 100  * Smart Agriculture
101 101  
102 -
103 -
104 104  == 1.6  Pin mapping and power on ==
105 105  
106 106  
... ... @@ -108,10 +108,8 @@
108 108  
109 109  **~ **
110 110  
111 -
112 112  = 2.  Use NLMS01 to communicate with IoT Server =
113 113  
114 -
115 115  == 2.1  How it works ==
116 116  
117 117  
... ... @@ -123,10 +123,8 @@
123 123  [[image:image-20220907171221-5.png]]
124 124  
125 125  
126 -
127 127  == 2.2 ​ Configure the NLMS01 ==
128 128  
129 -
130 130  === 2.2.1 Test Requirement ===
131 131  
132 132  
... ... @@ -142,7 +142,6 @@
142 142  [[image:image-20220907171221-6.png]] ​
143 143  
144 144  
145 -
146 146  === 2.2.2 Insert SIM card ===
147 147  
148 148  
... ... @@ -154,7 +154,6 @@
154 154  [[image:image-20220907171221-7.png]] ​
155 155  
156 156  
157 -
158 158  === 2.2.3 Connect USB – TTL to NLMS01 to configure it ===
159 159  
160 160  
... ... @@ -186,7 +186,6 @@
186 186  (% style="color:red" %)**Note: the valid AT Commands can be found at:  **(%%)[[**https:~~/~~/www.dropbox.com/sh/351dwor6joz8nwh/AADn1BQaAAxLF_QMyU8NkW47a?dl=0**>>url:https://www.dropbox.com/sh/351dwor6joz8nwh/AADn1BQaAAxLF_QMyU8NkW47a?dl=0]]
187 187  
188 188  
189 -
190 190  === 2.2.4 Use CoAP protocol to uplink data ===
191 191  
192 192  
... ... @@ -209,7 +209,6 @@
209 209  [[image:image-20220907171221-10.png]] ​
210 210  
211 211  
212 -
213 213  === 2.2.5 Use UDP protocol to uplink data(Default protocol) ===
214 214  
215 215  
... ... @@ -226,7 +226,6 @@
226 226  
227 227  ​
228 228  
229 -
230 230  === 2.2.6 Use MQTT protocol to uplink data ===
231 231  
232 232  
... ... @@ -251,7 +251,6 @@
251 251  MQTT protocol has a much higher power consumption compare vs UDP / CoAP protocol. Please check the power analyze document and adjust the uplink period to a suitable interval.
252 252  
253 253  
254 -
255 255  === 2.2.7 Use TCP protocol to uplink data ===
256 256  
257 257  
... ... @@ -279,7 +279,6 @@
279 279  (% style="color:red" %)**NOTE: By default, the device will send an uplink message every 2 hour. Each Uplink Include 8 set of records in this 2 hour (15 minute interval / record).**
280 280  
281 281  
282 -
283 283  == 2.3  Uplink Payload ==
284 284  
285 285  
... ... @@ -287,11 +287,10 @@
287 287  
288 288  Each time the device uploads a data package, 8 sets of recorded data will be attached. Up to 32 sets of recorded data can be uploaded.
289 289  
282 +(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:517px" %)
283 +|(% style="background-color:#4f81bd; color:white; width:50px" %)**Size(bytes)**|(% style="background-color:#4f81bd; color:white; width:40px" %)**8**|(% style="background-color:#4f81bd; color:white; width:20px" %)**2**|(% style="background-color:#4f81bd; color:white; width:20px" %)**2**|(% style="background-color:#4f81bd; color:white; width:50px" %)**1**|(% style="background-color:#4f81bd; color:white; width:30px" %)**1**|(% style="background-color:#4f81bd; color:white; width:40px" %)**1**|(% style="background-color:#4f81bd; color:white; width:40px" %)**2**|(% style="background-color:#4f81bd; color:white; width:50px" %)**2**|(% style="background-color:#4f81bd; color:white; width:50px" %)**4**|(% style="background-color:#4f81bd; color:white; width:50px" %)**2**|(% style="background-color:#4f81bd; color:white; width:40px" %)**2**|(% style="background-color:#4f81bd; color:white; width:37px" %)**4**
284 +|(% style="width:96px" %)Value|(% style="width:82px" %)Device ID|(% style="width:42px" %)Ver|(% style="width:48px" %)BAT|(% style="width:124px" %)Signal Strength|(% style="width:58px" %)MOD|(% style="width:82px" %)Interrupt|(% style="width:113px" %)Leaf moisture|(% style="width:134px" %)Leaf Temperature|(% style="width:100px" %)Time stamp|(% style="width:137px" %)Leaf Temperature|(% style="width:110px" %)Leaf moisture|(% style="width:122px" %)Time stamp  .....
290 290  
291 -(% border="1" style="background-color:#ffffcc; color:green; width:1251px" %)
292 -|(% style="width:96px" %)**Size(bytes)**|(% style="width:82px" %)**8**|(% style="width:42px" %)**2**|(% style="width:48px" %)**2**|(% style="width:124px" %)1|(% style="width:58px" %)1|(% style="width:82px" %)1|(% style="width:113px" %)2|(% style="width:134px" %)2|(% style="width:100px" %)4|(% style="width:137px" %)2|(% style="width:110px" %)2|(% style="width:122px" %)4
293 -|(% style="width:96px" %)**Value**|(% style="width:82px" %)Device ID|(% style="width:42px" %)Ver|(% style="width:48px" %)BAT|(% style="width:124px" %)Signal Strength|(% style="width:58px" %)MOD|(% style="width:82px" %)Interrupt|(% style="width:113px" %)Leaf moisture|(% style="width:134px" %)Leaf Temperature|(% style="width:100px" %)Time stamp|(% style="width:137px" %)Leaf Temperature|(% style="width:110px" %)Leaf moisture|(% style="width:122px" %)Time stamp  .....
294 -
295 295  If we use the MQTT client to subscribe to this MQTT topic, we can see the following information when the NLMS01 uplink data.
296 296  
297 297  
... ... @@ -304,23 +304,30 @@
304 304  
305 305  where:
306 306  
307 -* Device ID: 0xf868411056754138 = f868411056754138
308 -* Version: 0x0064=100=1.0.0
309 -* BAT: 0x0c78 = 3192 mV = 3.192V
310 -* Singal: 0x17 = 23
311 -* Mod: 0x01 = 1
312 -* Interrupt: 0x00= 0
313 -* Leaf moisture: 0x0225= 549 = 54.9%
314 -* Leaf Temperature:0x010B =267=26.7 °C
315 -* Time stamp : 0x6315537b =1662342011 ([[Unix Epoch Time>>https://www.epochconverter.com/]])
316 -* Leaf Temperature, Leaf moisture,Time stamp : 010b0226631550fb
317 -* 8 sets of recorded data: Leaf Temperature, Leaf moisture,Time stamp : 010e022663154d77,.......
298 +* (% style="color:#037691" %)**Device ID:**(%%) 0xf868411056754138 = f868411056754138
318 318  
300 +* (% style="color:#037691" %)**Version:**(%%) 0x0064=100=1.0.0
319 319  
302 +* (% style="color:#037691" %)**BAT:**       (%%)0x0c78 = 3192 mV = 3.192V
320 320  
321 -== 2.4  Payload Explanation and Sensor Interface ==
304 +* (% style="color:#037691" %)**Singal:**(%%)  0x17 = 23
322 322  
306 +* (% style="color:#037691" %)**Mod:**(%%)  0x01 = 1
323 323  
308 +* (% style="color:#037691" %)**Interrupt:**(%%) 0x00= 0
309 +
310 +* (% style="color:#037691" %)**Leaf moisture:**(%%) 0x0225= 549 = 54.9%
311 +
312 +* (% style="color:#037691" %)**Leaf Temperature: **(%%)0x010B =267=26.7 °C
313 +
314 +* (% style="color:#037691" %)**Time stamp :**   (%%)0x6315537b =1662342011 ([[Unix Epoch Time>>https://www.epochconverter.com/]])
315 +
316 +* (% style="color:#037691" %)**Leaf Temperature, Leaf moisture,Time stamp :  **(%%)010b0226631550fb
317 +
318 +* (% style="color:#037691" %)**8 sets of recorded data: **(%%)Leaf Temperature, Leaf moisture,Time stamp : 010e022663154d77,.......
319 +
320 +== 2.4  Payload Explanation and Sensor Interface ==
321 +
324 324  === 2.4.1  Device ID ===
325 325  
326 326  
... ... @@ -336,7 +336,6 @@
336 336  The Device ID is stored in a none-erase area, Upgrade the firmware or run AT+FDR won't erase Device ID.
337 337  
338 338  
339 -
340 340  === 2.4.2  Version Info ===
341 341  
342 342  
... ... @@ -345,7 +345,6 @@
345 345  For example: 0x00 64 : this device is NLMS01 with firmware version 1.0.0.
346 346  
347 347  
348 -
349 349  === 2.4.3  Battery Info ===
350 350  
351 351  
... ... @@ -356,7 +356,6 @@
356 356  Ex2: 0x0B49 = 2889mV
357 357  
358 358  
359 -
360 360  === 2.4.4  Signal Strength ===
361 361  
362 362  
... ... @@ -376,7 +376,6 @@
376 376  **99**    Not known or not detectable
377 377  
378 378  
379 -
380 380  === 2.4.5  Leaf moisture ===
381 381  
382 382  
... ... @@ -387,7 +387,6 @@
387 387  (% style="color:blue" %)**0229(H) = 549(D) /100 = 54.9.**
388 388  
389 389  
390 -
391 391  === 2.4.6  Leaf Temperature ===
392 392  
393 393  
... ... @@ -400,7 +400,6 @@
400 400  If payload is **FF7EH**: ((FF7E & 0x8000)>>15 ===1),temp = (FF7E(H)-FFFF(H))/10 = -12.9 °C
401 401  
402 402  
403 -
404 404  === 2.4.7  Timestamp ===
405 405  
406 406  
... ... @@ -409,7 +409,6 @@
409 409  Convert Unix timestamp to time 2022-9-5 9:40:11.
410 410  
411 411  
412 -
413 413  === 2.4.8  Digital Interrupt ===
414 414  
415 415  
... ... @@ -428,7 +428,6 @@
428 428  0x(01): Interrupt Uplink Packet.
429 429  
430 430  
431 -
432 432  === 2.4.9  ​+5V Output ===
433 433  
434 434  
... ... @@ -441,14 +441,18 @@
441 441  Means set 5V valid time to have 1000ms. So the real 5V output will actually have 1000ms + sampling time for other sensors.** **
442 442  
443 443  
444 -
445 445  == 2.5  Downlink Payload ==
446 446  
447 447  
448 448  By default, NLMS01 prints the downlink payload to console port.
449 449  
450 -[[image:image-20220907171221-18.png]] ​
439 +(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
440 +|=(% style="width: 183px; background-color:#4F81BD;color:white" %)**Downlink Control Type**|=(% style="width: 55px; background-color:#4F81BD;color:white" %)FPort|=(% style="width: 93px; background-color:#4F81BD;color:white" %)**Type Code**|=(% style="width: 179px; background-color:#4F81BD;color:white" %)**Downlink payload size(bytes)**
441 +|(% style="width:183px" %)TDC (Transmit Time Interval)|(% style="width:55px" %)Any|(% style="width:93px" %)01|(% style="width:146px" %)4
442 +|(% style="width:183px" %)RESET|(% style="width:55px" %)Any|(% style="width:93px" %)04|(% style="width:146px" %)2
443 +|(% style="width:183px" %)INTMOD|(% style="width:55px" %)Any|(% style="width:93px" %)06|(% style="width:146px" %)4
451 451  
445 + ​
452 452  
453 453  (% style="color:blue" %)**Examples:**
454 454  
... ... @@ -474,7 +474,6 @@
474 474  Downlink Payload: 06000003, Set AT+INTMOD=3
475 475  
476 476  
477 -
478 478  == 2.6  ​LED Indicator ==
479 479  
480 480  
... ... @@ -485,8 +485,6 @@
485 485  * After NLMS01 join NB-IoT network. The LED will be ON for 3 seconds.
486 486  * For each uplink probe, LED will be on for 500ms.
487 487  
488 -
489 -
490 490  == 2.7  Installation ==
491 491  
492 492  
... ... @@ -496,7 +496,6 @@
496 496  [[image:image-20220907171221-19.png]]
497 497  
498 498  
499 -
500 500  == 2.8  Moisture and Temperature alarm function ==
501 501  
502 502  
... ... @@ -529,7 +529,6 @@
529 529  AT+ TEMPALARM=20,30 ~/~/ Alarm when temperature lower than 20.
530 530  
531 531  
532 -
533 533  == 2.9  Set the number of data to be uploaded and the recording time ==
534 534  
535 535  
... ... @@ -538,8 +538,11 @@
538 538  * (% style="color:#037691" %)**AT+TR=900**   (%%) ~/~/  The unit is seconds, and the default is to record data once every 900 seconds.( The minimum can be set to 180 seconds)
539 539  * (% style="color:#037691" %)**AT+NOUD=8**  (%%)~/~/  The device uploads 8 sets of recorded data by default. Up to 32 sets of record data can be uploaded.
540 540  
530 + The diagram below explains the relationship between TR, NOUD, and TDC more clearly**:**
541 541  
532 +[[image:image-20221009001002-1.png||height="706" width="982"]]
542 542  
534 +
543 543  == 2.10  Read or Clear cached data ==
544 544  
545 545  
... ... @@ -551,7 +551,6 @@
551 551  [[image:image-20220907171221-20.png]]
552 552  
553 553  
554 -
555 555  == 2.11  ​Firmware Change Log ==
556 556  
557 557  
... ... @@ -560,61 +560,14 @@
560 560  Upgrade Instruction: [[Upgrade Firmware>>||anchor="H5.1200BHowtoUpgradeFirmware"]]
561 561  
562 562  
554 +== 2.12 Battery & Power Consumption ==
563 563  
564 -== 2.12  ​Battery Analysis ==
565 565  
557 +NLMS01 uses ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.
566 566  
567 -=== 2.12.1  ​Battery Type ===
559 +[[**Battery Info & Power Consumption Analyze**>>url:http://wiki.dragino.com/xwiki/bin/view/Main/How%20to%20calculate%20the%20battery%20life%20of%20Dragino%20sensors%3F/]] .
568 568  
569 569  
570 -The NLMS01 battery is a combination of an 8500mAh Li/SOCI2 Battery and a Super Capacitor. The battery is none-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.
571 -
572 -The battery is designed to last for several years depends on the actually use environment and update interval. 
573 -
574 -The battery related documents as below:
575 -
576 -* [[Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]
577 -* [[Lithium-Thionyl Chloride Battery datasheet>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]
578 -* [[Lithium-ion Battery-Capacitor datasheet>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]
579 -
580 -[[image:image-20220907171221-21.png]] ​
581 -
582 -
583 -
584 -=== 2.12.2  Power consumption Analyze ===
585 -
586 -
587 -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.
588 -
589 -Instruction to use as below:
590 -
591 -(% style="color:blue" %)**Step 1:  **(%%)Downlink the up-to-date DRAGINO_Battery_Life_Prediction_Table.xlsx from: [[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/]]
592 -
593 -(% style="color:blue" %)**Step 2: **(%%) Open it and choose
594 -
595 -* Product Model
596 -* Uplink Interval
597 -* Working Mode
598 -
599 -And the Life expectation in difference case will be shown on the right.
600 -
601 -[[image:image-20220907171221-22.jpeg]] ​
602 -
603 -
604 -=== 2.12.3  ​Battery Note ===
605 -
606 -
607 -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 transmit LoRa, then the battery life may be decreased.
608 -
609 -
610 -
611 -=== 2.12.4  Replace the battery ===
612 -
613 -
614 -The default battery pack of NLMS01 includes a ER26500 plus super capacitor. If user can't find this pack locally, they can find ER26500 or equivalence without the SPC1520 capacitor, which will also work in most case. The SPC can enlarge the battery life for high frequency use (update period below 5 minutes).
615 -
616 -
617 -
618 618  = 3. ​ Access NB-IoT Module =
619 619  
620 620  
... ... @@ -626,10 +626,8 @@
626 626  [[image:image-20220907171221-23.png]] ​
627 627  
628 628  
629 -
630 630  = 4.  Using the AT Commands =
631 631  
632 -
633 633  == 4.1  Access AT Commands ==
634 634  
635 635  
... ... @@ -689,38 +689,36 @@
689 689  
690 690  (% style="color:#037691" %)**COAP Management**      
691 691  
692 -AT+URI            : Resource parameters
634 +AT+URI :  Resource parameters
693 693  
694 694  
695 695  (% style="color:#037691" %)**UDP Management**
696 696  
697 -AT+CFM          : Upload confirmation mode (only valid for UDP)
639 +AT+CFM :  Upload confirmation mode (only valid for UDP)
698 698  
699 699  
700 700  (% style="color:#037691" %)**MQTT Management**
701 701  
702 -AT+CLIENT               : Get or Set MQTT client
644 +AT+CLIENT  :  Get or Set MQTT client
703 703  
704 -AT+UNAME  : Get or Set MQTT Username
646 +AT+UNAME  : Get or Set MQTT Username
705 705  
706 -AT+PWD                  : Get or Set MQTT password
648 +AT+PWD  :  Get or Set MQTT password
707 707  
708 -AT+PUBTOPIC  : Get or Set MQTT publish topic
650 +AT+PUBTOPIC  :  Get or Set MQTT publish topic
709 709  
710 -AT+SUBTOPIC  : Get or Set MQTT subscription topic
652 +AT+SUBTOPIC :  Get or Set MQTT subscription topic
711 711  
712 712  
713 713  (% style="color:#037691" %)**Information**          
714 714  
715 -AT+FDR  : Factory Data Reset
657 +AT+FDR :  Factory Data Reset
716 716  
717 -AT+PWORD  : Serial Access Password
659 +AT+PWORD :  Serial Access Password
718 718  
719 719  
720 -
721 721  = ​5.  FAQ =
722 722  
723 -
724 724  == 5.1 ​ How to Upgrade Firmware ==
725 725  
726 726  
... ... @@ -732,10 +732,8 @@
732 732  (% style="color:red" %)**Notice, NLMS01 and LLMS01 share the same mother board. They use the same connection and method to update.**
733 733  
734 734  
735 -
736 736  = 6.  Trouble Shooting =
737 737  
738 -
739 739  == 6.1  ​Connection problem when uploading firmware ==
740 740  
741 741  
... ... @@ -742,7 +742,6 @@
742 742  **Please see: **[[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Firmware%20Upgrade%20Instruction%20for%20STM32%20base%20products/#H3.3Troubleshooting>>url:http://wiki.dragino.com/xwiki/bin/view/Main/Firmware%20Upgrade%20Instruction%20for%20STM32%20base%20products/#H3.3Troubleshooting]]
743 743  
744 744  
745 -
746 746  == 6.2  AT Command input doesn't work ==
747 747  
748 748  
... ... @@ -749,7 +749,24 @@
749 749  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.
750 750  
751 751  
689 +== 6.3 Not able to connect to NB-IoT network and keep showing "Signal Strength:99". ==
752 752  
691 +
692 +This means sensor is trying to join the NB-IoT network but fail. Please see this link for **//[[trouble shooting for signal strenght:99>>doc:Main.CSQ\:99,99.WebHome]]//**.
693 +
694 +
695 +== 6.4 Possible reasons why the device is unresponsive： ==
696 +
697 +
698 +​1. Check whether the battery voltage is lower than 2.8V
699 +2. Check whether the jumper of the device is correctly connected
700 +
701 +[[image:image-20240330175629-2.png]]
702 +3. Check whether the switch here of the device is at the ISP（The switch can operate normally only when it is in RUN）
703 +​
704 +
705 +[[image:image-20240330175554-1.png]]
706 +
753 753  = 7. ​ Order Info =
754 754  
755 755  
... ... @@ -756,7 +756,6 @@
756 756  Part Number**:** NLMS01
757 757  
758 758  
759 -
760 760  = 8.  Packing Info =
761 761  
762 762  
... ... @@ -771,7 +771,6 @@
771 771  * Package Size / pcs : cm
772 772  * Weight / pcs : g
773 773  
774 -
775 775  = 9.  Support =
776 776  
777 777  
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