Version 65.2 by Xiaoling on 2022/06/25 09:43
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3 (% style="text-align:center" %)
4 [[image:image-20220530000243-1.png||height="332" width="531"]]
5
6
7 **Table of Contents：**
8
9 {{toc/}}
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16
17
18 = 1.  Introduction =
19
20 == 1.1  What is GroPoint Air ==
21
22
23 The Dragino GroPoint is a (% style="color:blue" %)**LoRaWAN Multi Soil Segment Converter**(%%) for IoT of Agriculture. It is designed to connect to [[GroPoint Profile Multi-depth Soil moisture and temperature profile Sensor>>url:https://www.gropoint.com/products/soil-sensors/gropoint-profile]] and get GroPoint Profile’s reading and send it to IoT server via LoRaWAN wireless network.
24
25 (% style="color:blue" %)**GroPoint Profile is plug-and-play with GroPoint Air**(%%) to get soil moisture and send via wireless. GroPoint Profile is powered by GroPoint Air, (% style="color:blue" %)**no need external power source**(%%).
26
27 The LoRa wireless technology used in GroPoint Air allows devices 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.
28
29 GroPoint Air is powered by (% style="color:blue" %)**an 8500mAh Li-SOCI2 battery**(%%), it is designed for long-term use for up to 5 years.
30
31 Each GroPoint Air is pre-load with a set of unique keys for LoRaWAN registrations, register these keys to the local LoRaWAN server and it will auto-connect after power on.
32
33 [[image:image-20220530002019-2.png||height="295" width="655"]]
34
35
36 == 1.2  Features ==
37
38 * LoRaWAN 1.0.3 Class A
39 * Ultra-low power consumption
40 * Supports GroPoint Profile
41 * Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/IN865
42 * AT Commands to change parameters
43 * Uplink on periodically
44 * Downlink to change configure
45 * IP66 Waterproof Enclosure
46 * 8500mAh Battery for long term use
47
48
49
50
51
52 == 1.3  Probe Specification ==
53
54 GroPoint Air includes an M12 5-pin connector, the pins definition matches GroPoint Profile M12 version probes. Users can connect this connector to GroPoint Profile directly.
55
56 GroPoint Profile includes a series of multi-depth soil moisture and temperature sensors. The specification for GroPoint Profile can be found here: [[https:~~/~~/www.gropoint.com/products/soil-sensors/gropoint-profile>>https://www.gropoint.com/products/soil-sensors/gropoint-profile]]
57
58
59 == 1.4  Applications ==
60
61 * Smart Agriculture
62
63
64
65
66 == 1.5  Pin Mapping ==
67
68 Inner PCB Pin mapping for reference:
69
70 [[image:image-20220530002453-3.png||height="262" width="493"]]
71
72
73 = 2.  Connect LoRaWAN Network =
74
75
76 == 2.1  LED Indicator ==
77
78 The GroPoint Air has an internal LED which can show the status of different states.
79
80 * The sensor is detected when the device is turned on, and it will flash 4 times quickly when it is detected.
81 * Blink once when device transmits a packet.
82
83
84
85
86
87 == 2.2  Firmware and Changelog ==
88
89 Firmware Download Location: [[https:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/GroPoint_Air/firmware/>>https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/GroPoint_Air/firmware/]]
90
91 Change Log:
92
93
94 = 3.  How to use? =
95
96 == 3.1  Connect to GroPoint Profile ==
97
98 GroPoint Air must be used with [[GroPoint Profile>>https://www.gropoint.com/products/soil-sensors/gropoint-profile]]. There are different interface model from GroPoint, users need to choose the one:
99
100 * Support RS485 Interface
101 * with M12 5pin connector.
102
103 Such model in GroPoint Profile is: **2625-N-T-x-M-M **(Where x is different depending on how many levels it detects).
104
105
106 == 3.2  Connect to LoRaWAN Network? ==
107
108 Each GroPoint Air is shipped with a worldwide unique set of OTAA keys. To use GroPoint Air in a LoRaWAN network, user needs to input the OTAA keys in the LoRaWAN network server. So GroPoint Air can join the LoRaWAN network and start to transmit sensor data
109
110
111 == 3.3  Example to use for LoRaWAN network ==
112
113 This section shows an example of how to join the TTN V3 LoRaWAN IoT server. Usages with other LoRaWAN IoT servers are similar.
114
115 * In this use case, the GroPoint Air measures soil moisture and temperature and sends the status to the LoRaWAN server.The GroPoint Air will uplink different types of messages to the LoRaWAN server. See [[Uplink payload>>url:http://wiki.dragino.com/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SW3L%20LoRaWAN%20Outdoor%20Flow%20Sensor/#H2.3UplinkPayload]] for detail.
116
117 Assume the DLOS8 is already set to connect to the [[TTN V3 network >>url:https://eu1.cloud.thethings.network/]]. We need to add the GroPoint Air device in TTN V3:
118
119 **Step 1**: Create a device in TTN V3 with the OTAA keys from GroPoint Air.
120
121 Each GroPoint Air is shipped with a sticker with the default device EUI as below:
122
123
124 [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SW3L%20LoRaWAN%20Outdoor%20Flow%20Sensor/WebHome/1652944593868-618.png?rev=1.1||alt="1652944593868-618.png"]]
125
126 Users can enter these keys in the LoRaWAN Server portal. Below is the TTN V3 screenshot:
127
128 Add APP EUI in the application.
129
130 [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SW3L%20LoRaWAN%20Outdoor%20Flow%20Sensor/WebHome/image-20220519151704-1.png?rev=1.1||alt="image-20220519151704-1.png"]]
131
132 [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SW3L%20LoRaWAN%20Outdoor%20Flow%20Sensor/WebHome/image-20220519151704-2.png?width=717&height=322&rev=1.1||alt="image-20220519151704-2.png" height="322" width="717"]]
133
134 [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SW3L%20LoRaWAN%20Outdoor%20Flow%20Sensor/WebHome/image-20220519151704-3.png?rev=1.1||alt="image-20220519151704-3.png"]]
135
136 [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SW3L%20LoRaWAN%20Outdoor%20Flow%20Sensor/WebHome/image-20220519151704-4.png?rev=1.1||alt="image-20220519151704-4.png"]]
137
138 Add APP KEY and DEV EUI
139
140 **Step 2**: Power on GroPoint Air
141
142 [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SW3L%20LoRaWAN%20Outdoor%20Flow%20Sensor/WebHome/image-20220519094347-1.png?width=725&height=430&rev=1.1||alt="image-20220519094347-1.png" height="430" width="725"]]
143
144 Put the jumper to power on GroPoint Air and it will auto-join to the TTN V3 network. After join success, it will start to upload sensor data to TTN V3 and the user can see it in the panel.
145
146 [[image:image-20220611174943-1.png||height="139" width="1008"]]
147
148
149 === **Decoder in TTN V3** ===
150
151 [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/SW3L%20LoRaWAN%20Outdoor%20Flow%20Sensor/WebHome/1652927365661-475.png?width=723&height=359&rev=1.1||alt="1652927365661-475.png" height="359" width="723"]]
152
153 Please check the decoder [gropoint_Decoder_V1.0.0.js] from this link:
154
155 [[https:~~/~~/www.dropbox.com/sh/4strg6w7kkekdc4/AAAUKdAV3XKhOi3t6YjA8j9za?dl=0>>https://www.dropbox.com/sh/4strg6w7kkekdc4/AAAUKdAV3XKhOi3t6YjA8j9za?dl=0]]
156
157
158 == 3.4  Uplink Payload Analyze ==
159
160 Uplink payloads have two types:
161
162 * (((
163 Report temperature and humidity status normally: Use FPORT=2
164 )))
165 * (((
166 Other control commands: Use other FPORT fields.
167 )))
168
169 The application server should parse the correct value based on FPORT settings.
170
171
172 == 3.5  temperature and humidity Value, Uplink FPORT~=2 ==
173
174
175 GroPoint Air will send this uplink after Device Status once join the LoRaWAN network successfully. And GroPoint Air will:
176
177 periodically send this uplink every 20 minutes, this interval can be changed.
178
179 The drawing below shows the probe dimensions of the 2-8 segment probes, Temperature sen sor locations provided in table below:
180
181 [[image:image-20220621093414-1.png||height="932" width="816"]]
182
183 GroPoint Air's sensors come in six models:GPLP-2，GPLP-3，GPLP-4，GPLP-5，GPLP-6，GPLP-8.
184
185 The amount of temperature and humidity is different for each model, so the payload of each model is different.
186
187 Take GPLP-3 as an example：
188
189 Uplink Payload totals 21 bytes.
190
191 [[image:image-20220621100751-2.png||height="124" width="774"]]
192
193 [[image:image-20220611174943-1.png||height="139" width="1008"]]
194
195
196 For US915 frequency, when DR=0 and the payload length exceeds 11, the DR of this packet is switched to 1.
197
198 For AU915 frequency, when DR=2，Dwelltime=1 and the payload length exceeds 11, the DR of this packet is switched to 3.
199
200 For AS923 frequency, when DR=2，Dwelltime=1 and the payload length exceeds 11, the DR of this packet is switched to 3.
201
202
203 == 3.6  Show data on Datacake ==
204
205 Datacake IoT platform provides a human-friendly interface to show the sensor data, 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:
206
207 **Step 1**: Link TTNv3 to Datacake [[https:~~/~~/docs.datacake.de/lorawan/lns/thethingsindustries#create-integration-on-tti>>url:https://docs.datacake.de/lorawan/lns/thethingsindustries#create-integration-on-tti]]
208
209 **Step 2**: Configure SW3L in Datacake  ​​​​
210
211 [[image:image-20220613171007-1.png||height="567" width="542"]]
212
213 [[image:image-20220613171015-2.png||height="600" width="586"]]
214
215 [[image:image-20220613171029-3.png||height="507" width="513"]]
216
217 [[image:image-20220613171038-4.png||height="469" width="786"]]
218
219 [[image:image-20220613171105-5.png||height="533" width="949"]]
220
221 [[image:image-20220613171117-6.png||height="501" width="925"]]
222
223 [[image:image-20220613171124-7.png||height="466" width="877"]]
224
225
226
227 = 4.  Configure GroPoint Air via AT Command or LoRaWAN Downlink =
228
229 Use can configure GroPoint Air via AT Command or LoRaWAN Downlink.
230
231 * AT Command Connection: See [[FAQ>>url:http://8.211.40.43/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLMS01-LoRaWAN%20Leaf%20Moisture%20Sensor%20User%20Manual/#H6.FAQ]].
232 * LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>url:http://8.211.40.43/xwiki/bin/view/Main/]]
233
234 There are two kinds of commands to configure GroPoint Air, they are:
235
236 * (((
237 **~ General Commands**.
238 )))
239
240 These commands are to configure:
241
242 * General system settings like: uplink interval.
243 * LoRaWAN protocol & radio-related command.
244
245 They are the same for all Dragino Device that support DLWS-005 LoRaWAN Stack. These commands can be found on the wiki: [[End Device AT Commands and Downlink Command>>url:http://8.211.40.43/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/]]
246
247
248 * (((
249 **~ Commands special design for GroPoint Air**
250 )))
251
252 These commands only valid for GroPoint Air, as below:
253
254
255
256 == 4.1  Set Transmit Interval Time ==
257
258 Feature: Change LoRaWAN End Node Transmit Interval.
259
260 **AT Command: AT+TDC**
261
262 [[image:http://8.211.40.43/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLMS01-LoRaWAN%20Leaf%20Moisture%20Sensor%20User%20Manual/WebHome/image-20220607171554-8.png?rev=1.1||alt="image-20220607171554-8.png"]]
263
264 **Downlink Command: 0x01**
265
266 Format: Command Code (0x01) followed by 3 bytes time value.
267
268 If the downlink payload=0100003C, it means set the END Node’s Transmit Interval to 0x00003C=60(S), while type code is 01.
269
270 * Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
271 * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
272
273
274
275
276
277 == 4.2  Set Interrupt Mode ==
278
279 Feature, Set Interrupt mode for GPIO_EXIT.
280
281 **AT Command: AT+INTMOD**
282
283 [[image:http://8.211.40.43/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLMS01-LoRaWAN%20Leaf%20Moisture%20Sensor%20User%20Manual/WebHome/image-20220607171716-9.png?rev=1.1||alt="image-20220607171716-9.png"]]
284
285 **Downlink Command: 0x06**
286
287 Format: Command Code (0x06) followed by 3 bytes.
288
289 This means that the interrupt mode of the end node is set to 0x000003=3 (rising edge trigger), and the type code is 06.
290
291 * Example 1: Downlink Payload: 06000000 ~/~/ Turn off interrupt mode
292 * Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
293
294
295
296
297
298 == (% id="cke_bm_55968S" style="display:none" %) (%%)4.3  Set the sensor delay time ==
299
300 Feature: Change the sensor delay time.
301
302 There are six models of GroPoint Air, and each model returns a different number of temperature and humidity. The more bytes of the returned value, the longer the delay. The AT+SDELAY command can adjust the time that the sensor returns data to the node, and can adjust different delays according to different types of sensors.
303
304 The default delay is 1000ms.
305
306 **AT Command: AT+SDELAY**
307
308 [[image:image-20220613175511-8.png]]
309
310 **Downlink Command: 0xA1**
311
312 Format: Command Code (0xA1) followed by 3 bytes time value.
313
314 If the downlink payload=A10007D0, it means set the sensor delay time to 0x0007D0=2000ms, while type code is A1.
315
316 * Example 1: Downlink Payload: A10003E8 ~/~/ Set the sensor delay time = 1000ms
317 * Example 2: Downlink Payload: A10007D0 ~/~/ Set the sensor delay time = 2000ms
318
319
320
321
322
323 == 4.4  Query sensor model function ==
324
325 Feature: Using this function will re-update the model.
326
327 **Downlink Command: 0xFA00**
328
329
330 == 4.5  Get Firmware Version Info ==
331
332 Feature: use downlink to get firmware version.
333
334 **Downlink Command: 0x26**
335
336 [[image:http://8.211.40.43/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLMS01-LoRaWAN%20Leaf%20Moisture%20Sensor%20User%20Manual/WebHome/image-20220607171917-10.png?rev=1.1||alt="image-20220607171917-10.png"]]
337
338 * Reply to the confirmation package: 26 01
339 * Reply to non-confirmed packet: 26 00
340
341
342 Device will send an uplink after got this downlink command. With below payload:
343
344 Configures info payload:
345
346 (% border="1" cellspacing="8" style="background-color:#ffffcc; color:green; width:510px" %)
347 |=(% style="width: 96px;" %)(((
348 **Size(bytes)**
349 )))|=(% style="width: 119px;" %)**1**|=(% style="width: 88px;" %)**1**|=(% style="width: 88px;" %)**1**|=(% style="width: 82px;" %)**2**|=(% style="width: 108px;" %)**1**|=(% style="width: 76px;" %)4|=(% style="width: 102px;" %)**1**
350 |(% style="width:96px" %)**Value**|(% style="width:119px" %)Software Type|(% style="width:88px" %)(((
351 Frequency
352
353 Band
354 )))|(% style="width:88px" %)Sub-band|(% style="width:82px" %)(((
355 Firmware
356
357 Version
358 )))|(% style="width:108px" %)Sensor Type|(% style="width:76px" %)Reserve|(% style="width:102px" %)(((
359 [[Message Type>>url:http://8.211.40.43/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLMS01-LoRaWAN%20Leaf%20Moisture%20Sensor%20User%20Manual/#H2.3.6MessageType]]
360 Always 0x02
361 )))
362
363 **Software Type**: Always 0x03 for LLMS01
364
365 **Frequency Band**:
366
367 *0x01: EU868
368
369 *0x02: US915
370
371 *0x03: IN865
372
373 *0x04: AU915
374
375 *0x05: KZ865
376
377 *0x06: RU864
378
379 *0x07: AS923
380
381 *0x08: AS923-1
382
383 *0x09: AS923-2
384
385 *0x0A: AS923-3
386
387 *0x0B: AS923-4
388
389 **Sub-Band**: value 0x00 ~~ 0x08
390
391 **Firmware Version**: 0x0100, Means: v1.0.0 version
392
393 **Sensor Type**:
394
395 0x01: LSE01
396
397 0x02: LDDS75
398
399 0x03: LDDS20
400
401 0x04: LLMS01
402
403 0x05: LSPH01
404
405 0x06: LSNPK01
406
407 0x07: LDDS45
408
409 0x08: LSLP01
410
411
412 = 5.  Use AT Command =
413
414 == 5.1  Access AT Commands ==
415
416 GroPoint Air supports AT Command set in the stock firmware. You can use a USB to TTL adapter to connect to GroPoint Air for using AT command, as below.
417
418 [[image:Main.User Manual for LoRaWAN End Nodes.LLMS01-LoRaWAN Leaf Moisture Sensor User Manual.WebHome@1654593668970-604.png||height="297" width="474"]]
419
420 **Connection:**
421
422 (% style="background-color:yellow" %)** USB TTL GND <~-~-~-~-> GND**
423
424 (% style="background-color:yellow" %)** USB TTL TXD <~-~-~-~-> UART_RXD**
425
426 (% style="background-color:yellow" %)** USB TTL RXD <~-~-~-~-> UART_TXD**
427
428
429 In the PC, you need to set the serial baud rate to (% style="color:green" %)**9600**(%%) to access the serial console for GroPoint Air. GroPoint Air will output system info once power on as below:
430
431 [[image:Main.User Manual for LoRaWAN End Nodes.LLMS01-LoRaWAN Leaf Moisture Sensor User Manual.WebHome@1654653659449-932.png||height="471" width="674"]]
432
433 Valid AT Command please check [[Configure Device>>||anchor="H3.ConfigureLLMS01viaATCommandorLoRaWANDownlink"]].
434
435
436 = 6.  Battery & How to replace =
437
438 == 6.1  Battery Type ==
439
440 GroPoint Air is equipped with a [[8500mAH ER26500 Li-SOCI2 battery>>url:https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]. The battery is an un-rechargeable battery with a low discharge rate targeting more than 5 years use. This type of battery is commonly used in IoT targets for long-term running, such as water meters.
441
442 The discharge curve is not linear so can’t simply use percentage to show the battery level. Below is the battery performance.
443
444
445 [[image:http://8.211.40.43/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLMS01-LoRaWAN%20Leaf%20Moisture%20Sensor%20User%20Manual/WebHome/1654593587246-335.png?rev=1.1||alt="1654593587246-335.png" height="408" width="574"]]
446
447 Minimum Working Voltage for the GroPoint Air:
448
449 GroPoint Air:  2.45v ~~ 3.6v
450
451
452 == 6.2  Power Consumption Analyze ==
453
454 Dragino Battery-powered products are all runs in Low Power mode. We have an updated 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 intervals.
455
456 Instruction to use as below:
457
458
459 **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/]]
460
461
462 **Step 2**: Open it and choose
463
464 * (((
465 Product Model
466 )))
467 * (((
468 Uplink Interval
469 )))
470 * (((
471 Working Mode
472 )))
473
474 And the Life expectation in different cases will be shown on the right.
475
476 [[image:http://8.211.40.43/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLMS01-LoRaWAN%20Leaf%20Moisture%20Sensor%20User%20Manual/WebHome/1654593605679-189.png?rev=1.1||alt="1654593605679-189.png"]]
477
478 The battery-related documents as below:
479
480 * (((
481 [[Battery Dimension>>url:http://www.dragino.com/downloads/index.php?dir=datasheet/Battery/&file=LSN50-Battery-Dimension.pdf]],
482 )))
483 * (((
484 [[Lithium-Thionyl Chloride Battery  datasheet>>url:https://www.dragino.com/downloads/downloads/datasheet/Battery/ER26500/ER26500_Datasheet-EN.pdf]],
485 )))
486 * (((
487 [[Lithium-ion Battery-Capacitor datasheet>>url:http://www.dragino.com/downloads/downloads/datasheet/Battery/SPC_1520_datasheet.jpg]], [[Tech Spec>>url:http://www.dragino.com/downloads/downloads/datasheet/Battery/SPC1520%20Technical%20Specification20171123.pdf]]
488 )))
489
490 [[image:http://8.211.40.43/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLMS01-LoRaWAN%20Leaf%20Moisture%20Sensor%20User%20Manual/WebHome/image-20220607172042-11.png?rev=1.1||alt="image-20220607172042-11.png"]]
491
492
493 === ​6.2.1  Battery Note ===
494
495 The Li-SICO battery is designed for small current / long period applications. 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 to transmit LoRa, then the battery life may be decreased.
496
497
498 === 6.2.2  Replace the battery ===
499
500 (((
501 You can change the battery in GroPoint Air. The type of battery is not limited as long as the output is between 3v to 3.6v.
502 )))
503
504 (((
505 The default battery pack of GroPoint Air includes a ER26500 plus supercapacitor. If users can’t find this pack locally, they can find ER26500 or equivalence, which will also work in most cases. The SPC can enlarge the battery life for high-frequency use (update period below 5 minutes).
506 )))
507
508
509
510 = 7.  FAQ =
511
512 == 7.1  How to change the LoRa Frequency Bands/Region ==
513
514 You can follow the instruction here: [[how to upgrade image>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome||anchor="H2.HardwareUpgradeMethodSupportList"]].
515 When downloading the images, choose the required image file for download. ​
516
517
518 = 8.  Trouble Shooting =
519
520 == 8.1  AT Commands input doesn’t work ==
521
522 In 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 pressing the send key, user need to add ENTER in their string.
523
524
525 == 8.2  Why i see the payload is 7FFF? ==
526
527 The device will judge the length of the data received by the serial port. If the length of the received data is 0, it means that there is a problem with the sensor communication or the sensor is not connected properly, it is invalid data, and the uploaded data is 7FFF.
528
529
530 = 9.  Order Info =
531
532 Part Number: **GROPOINT AIR-M-XX**
533
534 **XX**: The default frequency band
535
536 * **AS923**: LoRaWAN AS923 band
537 * **AU915**: LoRaWAN AU915 band
538 * **EU433**: LoRaWAN EU433 band
539 * **EU868**: LoRaWAN EU868 band
540 * **KR920**: LoRaWAN KR920 band
541 * **US915**: LoRaWAN US915 band
542 * **IN865**: LoRaWAN IN865 band
543 * **CN470**: LoRaWAN CN470 band
544
545 (% class="wikigeneratedid" id="H200BPackingInfo" %)
546 ​
547
548
549
550
551
552 = 10.  Packing Info =
553
554 **Package Includes:  **
555
556 * GroPoint Air-M x 1
557
558 **Dimension and weight:**
559
560 * Device Size: cm
561 * Device Weight: g
562 * Package Size / pcs : cm
563 * Weight / pcs : g

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