Version 287.6 by Xiaoling on 2023/04/03 16:31
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3 (% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||height="15" role="presentation" title="Click and drag to move" width="15"]]
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7 [[image:image-20220617163631-2.jpeg||height="704" width="617"]]
8
9
10 **Table of Contents:**
11
12 {{toc/}}
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16 (% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||height="15" role="presentation" title="Click and drag to move" width="15"]]
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24
25
26
27 = 1.  Introduction =
28
29 == 1.1 ​ What is LTC2 LoRaWAN Temperature Transmitter ==
30
31 (((
32
33
34 (((
35 (((
36 The Dragino LTC2 Industrial LoRaWAN Temperature Transmitter is designed to monitor temperature for different environment. It supports to read (% style="color:#4472c4" %)**PT100 probe**(%%) and convert the value to temperature and uplink to IoT server via LoRaWAN protocol.
37 )))
38
39 (((
40 LTC2 supports (% style="color:#4472c4" %)**Datalog feature**(%%). User can retrieve the sensor value via LoRaWAN downlink command.
41 )))
42
43 (((
44 LTC2 is powered by (% style="color:#4472c4" %)**8500mA Li-SOCI2 battery**(%%) for long time measurement. The battery can run 2~~10 years depends on the network environment and working mode.
45 )))
46
47 (((
48 Each LTC2 has (% style="color:#4472c4" %)**two internal 24-bit ADC interfaces** (%%)and are calibrated on 12 set resistors to make sure the accuracy measurement on wide range.
49 )))
50
51 (((
52 LTC2 is LoRaWAN v1.0.3 compatible. Each LTC2 is pre-load with a set of unique keys for LoRaWAN registration, register these keys to local LoRaWAN server and it will auto connect after power on.
53 )))
54
55
56 [[image:image-20220617164020-3.png||height="450" width="1084"]]
57 )))
58 )))
59
60
61 == ​1.2  Features ==
62
63
64 * LoRaWAN v1.0.3 Class A
65 * max: 2 x monitor temperature channels
66 * Support 3 -wire PT-100
67 * 8500mAh Li-SOCI2 Battery
68 * Firmware upgrade via console
69 * Wall Mountable
70 * Configurable via LoRa or UART
71 * Datalog and retrieve via LoRaWAN
72 * Use pre-load PT100 probe or 3rd PT100 probe
73 * Factory calibration for different resistance range
74 * Support accuracy measure of resistance and upload
75 * Battery Monitoring and upload
76 * Operation Temperature: -40 ~~ 65 ℃
77
78 (% style="display:none" %) ** **
79
80
81
82 == 1.3 ​ Applications ==
83
84
85 * Logistics and Supply Chain Management
86 * Food management
87 * Cold chains solution
88 * Industrial Monitoring and Control
89
90
91
92 == 1.4 Hardware Change log ==
93
94
95 LTC2 v1.0: Release.
96
97
98 == 1.5  Pin Definitions and Switch ==
99
100 === (% title="Click and drag to resize" %)1.5.1  J(%%)umper JP2 ( Power ON) ===
101
102 (% class="wikigeneratedid" id="H200B200B200B200B" %)
103 (% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)​(%%)​
104
105 Put a jumper on JP2 will power on the LTC2.
106
107
108 === 1.5.2  LED ===
109
110
111 The LED will flash in below case.
112
113 (((
114 1.  Send an uplink packet
115
116
117 )))
118
119 === 1.5.3  PT100 Interfaces ===
120
121
122 (((
123 There are two independent channels to connect 2 x PT100 probes.
124 )))
125
126 (((
127 Each channel has 3-wire connection for 3-wire PT100 probes.
128 )))
129
130
131 === 1.5.4  Reset Button ===
132
133
134 Press this button will reboot the LTC2
135
136
137 === 1.6  Probe Variant ===
138
139
140 LTC2 provide default probe version. See below for the variant:
141
142
143 (% border="1" cellspacing="10" style="background-color:#f7faff; width:505px" %)
144 |=(% style="width: 78px;" %)(((
145 **Model**
146 )))|=(% style="width: 117px;" %)(((
147 **Photo**
148 )))|=(% style="width: 314px;" %)(((
149 **Description**
150 )))
151 |(% style="width:78px" %)(((
152 LTC2-SI
153 )))|(% style="width:117px" %)(((
154 [[image:1655458404877-785.png]]
155 )))|(% style="width:314px" %)(((
156 Standard IP68 Probe Version
157
158 * (((
159 LTC2 with 1 x Standard IP68 PT100 probe.
160 )))
161 * (((
162 Installation: Insert
163 )))
164 * (((
165 Cable Length : 2m
166 )))
167 * (((
168 PT100 Class : Class A
169 )))
170 * (((
171 Probe Dimension: 4*30mm
172 )))
173 * (((
174 Measure Range: -50 ~~ 200 °C
175 )))
176 * (((
177 Suitable Environment: General environment
178 )))
179 )))
180 |(% style="width:78px" %)(((
181 LTC2-LT
182 )))|(% style="width:117px" %)(((
183 [[image:image-20220617172838-2.png]]
184 )))|(% style="width:314px" %)(((
185 Low Temperature Version
186
187 * (((
188 LTC2 with 1 x Low Temperature PT100 probe.
189 )))
190 * (((
191 Installation: Insert
192 )))
193 * (((
194 Cable Length : 2m
195 )))
196 * (((
197 PT100 Class : Class A
198 )))
199 * (((
200 Probe Dimension: 4*30mm
201 )))
202 * (((
203 Measure Range: -196 ~~ 150 °C
204 )))
205 * (((
206 Suitable Environment: Low temperature measurement, such as COVID vaccine transport
207 )))
208 )))
209 |(% style="width:78px" %)(((
210 LTC2-FS
211 )))|(% style="width:117px" %)(((
212 [[image:image-20220617172838-3.png]]
213 )))|(% style="width:314px" %)(((
214 Food Safety Version
215
216 * (((
217 LTC2 with 1 x Food Safety PT100 probe.
218 )))
219 * (((
220 Installation: Insert
221 )))
222 * (((
223 Cable Length : 2m
224 )))
225 * (((
226 PT100 Class : Class A
227 )))
228 * (((
229 Probe Dimension: 4*150mm
230 )))
231 * (((
232 Measure Range: -50 ~~ 200 °C
233 )))
234 * (((
235 Suitable Environment: Food temperature measurement
236 )))
237 )))
238 |(% style="width:78px" %)LTC-FSA|(% style="width:117px" %)[[image:image-20221222182717-1.jpeg]]|(% style="width:314px" %)(((
239 Food Safety Version
240
241 * (((
242 LTC2 with 1 x Food Safety PT100 probe.
243 )))
244 * (((
245 Installation: Insert
246 )))
247 * (((
248 Cable Length : 2m
249 )))
250 * (((
251 PT100 Class : Class A
252 )))
253 * (((
254 Probe Dimension: 4*150mm
255 )))
256 * (((
257 Measure Range: -50 ~~ 200 °C
258 )))
259 * (((
260 Suitable Environment: Food temperature measurement
261 )))
262 )))
263 |(% style="width:78px" %)(((
264 LTC2-FT
265 )))|(% style="width:117px" %)(((
266 (% style="text-align:center" %)
267 [[image:image-20220617172838-4.png]]
268 )))|(% style="width:314px" %)(((
269 Flat Type Version
270
271 * LTC2 with 1 x Flat Type PT100 probe.
272 * Installation: Attached
273 * Cable Length : 2m
274 * PT100 Class : Class A
275 * Probe Dimension: 8*25mm
276 * Measure Range: -50 ~~ 200 °C
277 * Suitable Environment: Attached to the measure point.
278 )))
279 |(% style="width:78px" %)LTC2-HT|(% style="width:117px" %)[[image:image-20220617172838-5.png]]|(% style="width:314px" %)(((
280 High Temperature Version
281
282 * LTC2 with 1 x high temperature PT100 probe.
283 * Installation: Insert
284 * Cable Length : 3m
285 * PT100 Class : Class A
286 * Probe Dimension: 4*30mm
287 * Measure Range: -70 ~~ 550 °C
288
289 Suitable Environment: High Temperature
290 )))
291 |(% style="width:78px" %)LTC2-NA|(% style="width:117px" %)[[image:image-20220617172838-6.png]]|(% style="width:314px" %)(((
292 No Probe version:
293
294 * User can connect to their own PT100 Probe
295 * Grand Hole: M12
296 * Suitable Environment:
297
298 Connect to customized probe
299 )))
300
301
302
303 = 2.  How to use LTC2? =
304
305 == 2.1  Connect to PT100 sensors ==
306
307
308 LTC2 has different probe option provided for ordering, if user has LTC2 with probe, just skip this step. If user want to connect to a 3^^rd^^ party PT100 probe, please see [[CONNECT A 3(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)^^rd^^ PARTY PT100 probe>>||anchor="H6.A0FAQ"]](%%).
309
310
311 === 2.2  How it works? ===
312
313
314 (((
315 (((
316 The LTC2 is working in LoRaWAN OTAA Class A mode. Each LTC2 is shipped with a worldwide unique set of OTAA and ABP keys. User needs to input the OTAA or ABP keys in the LoRaWAN network server so to register. LTC2 will join the LoRaWAN network and start to transmit data. The default period for each uplink is **20 minutes**.
317 )))
318
319 (((
320 On each uplink, LTC2 will check its two ADC Interfaces and get the temperature from the sensor and send out to server.
321 )))
322 )))
323
324
325 == 2.3  ​Quick guide to connect to LoRaWAN server (OTAA) ==
326
327
328 (((
329 Here is an example for how to join the [[TTN v3 LoRaWAN >>url:https://eu1.cloud.thethings.network/]]Server. Below is the network structure, in this demo we use [[DLOS8>>url:https://www.dragino.com/products/lora-lorawan-gateway/item/140-lg308.html]] as LoRaWAN gateway.
330
331 (% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:1655687566853-908.png]](% title="Click and drag to resize" %)​[[image:1655687927369-781.png]]
332 )))
333
334 (% title="Click and drag to resize" %)​(%%)The DLOS8 is already set to connect to [[TTN >>url:https://eu1.cloud.thethings.network/]]. Rest we need to is register the LTC2 to TTN v3:(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)​(%%)​
335
336 (((
337
338
339 === 2.3.1 Step 1: Create a device in TTN with the OTAA keys from LTC2 ===
340
341
342
343 Below is TTN screen shot:
344
345 * Create Application first.
346 * Manually Add a LoRaWAN End Device device. Choose **OTAA** and **MAC v1.0.3**
347
348 [[image:1655690861020-685.png]]
349
350
351 [[image:1655690877643-259.png]]
352
353
354 Input the OTAA keys for LTC2.
355
356 Each LTC2 is shipped with a sticker with the default device EUI as below:
357
358 (% aria-label="image-20220607170145-1.jpeg image widget" contenteditable="false" role="region" tabindex="-1" %)[[image:image-20220607170145-1.jpeg||data-widget="image"]]
359
360
361 * **Input these keys to device portal.**
362
363 [[image:image-20220620100853-1.png]]
364
365
366
367 * **Choose the Frequency band for this end node.**
368
369 [[image:image-20220620100853-2.png]]
370
371
372 * **Input APP Key in this page as well. **
373
374 [[image:image-20220620100853-3.png]]
375
376
377 Add payload formatter So TTNv3 knows how to parse the LTC2 upload value.
378
379
380 The payload for TTN can be found at below link:  [[ttps:~~/~~/github.com/dragino/dragino-end-node-decoder>>https://github.com/dragino/dragino-end-node-decoder]]
381
382
383 [[image:image-20220620100853-4.png]]
384
385
386 === 2.3.2  Step 2: Power on LTC2 ===
387
388
389 LTC2 is power off when ship from factory.
390
391 Put a Jumper on JP2 to power on the device.
392
393
394 [[image:1655691076464-442.png]]
395
396
397
398 (((
399 After power on, LTC2 will auto join to TTN network via the LoRaWAN coverage by DLOS8. After join success, LTC2 will start to update message to IoT server.
400 )))
401
402 (((
403 Below is an example uplink message which shows the LTC2 is sending Join Request to TTNv3.
404 )))
405
406
407 [[image:1655691086647-147.png]]
408
409
410 After join successful, LTC2 will send uplink message with the sensor value.
411
412 [[image:1655691100066-163.png]]
413
414 Above value shows Channel1 detect 25.94 degree. There is no PT100 connected on Channel 2, so it shows -327.67.
415 )))
416
417
418 == 2.4  ​Uplink Payload ==
419
420
421 (((
422 (((
423 (((
424 Below is the uplink payload which shows
425 )))
426 )))
427 )))
428
429 (((
430
431 )))
432
433 (% border="1" cellspacing="10" style="background-color:#ffffcc; width:510px" %)
434 |=(% style="width: 62.5px;" %)(((
435 **Size(bytes)**
436 )))|=(% style="width: 62.5px;" %)**2**|=**1**|=2|=2|=**4**
437 |(% style="width:62.5px" %)**Value**|(((
438 [[BAT>>||anchor="HBAT"]]
439
440
441 )))|(((
442 [[Status & EXT>>||anchor="HStatus26EXT"]]
443 )))|(((
444 [[Channel 1 data>>||anchor="HChannel1dataandChannel2data"]]
445 )))|(((
446 [[Channel 2 data>>||anchor="HChannel1dataandChannel2data"]]
447 )))|(((
448 [[Unix TimeStamp>>||anchor="HUnixTimeStamp"]]
449 )))
450
451 (% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]]
452
453
454 (((
455 === (% style="color:blue" %)**BAT**(%%) ===
456
457
458 (% class="wikigeneratedid" %)
459 Ex1: 0x0E3C ⇒ 3644 (mV) = 3.644 V
460
461 (% class="wikigeneratedid" %)
462
463 )))
464
465 (((
466 === (% style="color:blue" %)**Status & EXT**(%%) ===
467
468
469 )))
470
471 [[image:image-20220620103724-6.png]]
472
473 * (% style="color:#037691" %)**Poll Message Flag**(%%):  1: This message is a poll message reply, 0: means this is a normal uplink.
474 * (% style="color:#037691" %)**Sync time OK**(%%):  1: Set time ok，0: N/A. After time SYNC request is send, device will set this bit to 0 until got the time stamp from application server.
475 * (% style="color:#037691" %)**Unix Time Request**(%%):  1: Request server downlink Unix time, 0 : N/A. In this mode, LTC2 will set this bit to 1 every 10 day to request a time SYNC. (AT+SYNCMOD to set this)
476 * (% style="color:#037691" %)**EXT**(%%):  The decode method for Channel 1 data and Channel 2 data
477 ** 0b(0001): Upload PT100 temperature, with 2 decimals, range:  **-327.67 ~~ 327.67 ℃**
478 ** 0b(0010): Upload PT100 temperature, with 1 decimals, range: ** -3276.7 ~~ 3276.7 ℃**
479 ** 0b(0011): Upload Resistance instead of Temperature, range:  **-327.67~~ 327.67 ohm**
480
481 (((
482 (% class="wikigeneratedid" %)
483
484
485
486 === (% style="color:blue" %)**Channel1 data and Channel 2 data**(%%) ===
487
488
489 )))
490
491 (((
492 (% class="wikigeneratedid" %)
493 [[image:image-20220620103651-5.png]]
494
495
496 === (% style="color:blue" %)**Unix TimeStamp**(%%) ===
497
498
499 )))
500
501 Refer to Datalog feature.
502
503 (% style="color:#037691" %)**Example Uplink Payload**:
504
505
506 **Uplink payload example 1:**  0CE9011422EC2D6073E83B
507
508 * Bat voltage:0x0CE9 =3305mV
509 * Ext=0x01
510 * Channel1 temp=0x1422/100=51.54 ℃
511 * Channel2 temp=(0xEC2D-65536)/100=-50.75 ℃
512 * System timestamp=0x6073E83B= 1618208827(UTC)
513
514 If payload is: EC2DH :  (EC2D & 8000 == 1) , temp = (EC2DH - 65536)/100 = -50.75 ℃
515
516 （EC2D & 8000：Judge whether the highest bit is 1, when the highest bit is 1, it is negative）
517
518
519 **Uplink payload example 2: ** 0CED020203FE056073E697
520
521 * Bat voltage:0x0CED =3309mV
522 * Ext=0x02
523 * Channel1 temp=0x0203/10=515.4 ℃
524 * Channel2 temp=(0xFE05-65536)/10=-507.5 ℃
525 * System timestamp=0x6073E697=1618208407(UTC)
526
527 If payload is: FE05H :  (FE05 & 8000 == 1) , temp = (FE05H - 65536)/100 = 507.5 ℃
528
529 （EC2D & 8000：Judge whether the highest bit is 1, when the highest bit is 1, it is negative）
530
531
532 **Uplink payload example 3 :**  0CE9032EDE1F406073E967
533
534 * Bat voltage:0x0CE9 =3305mV
535 * Ext=0x03
536 * Channel1 res=0x2EDE/100=119.98 ohm
537 * Channel2 res=0x1F40/100=80.00 ohm
538 * System timestamp=0x6073E967= 1618209127(UTC)
539
540 (% title="Click and drag to resize" %)​​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)​(%%)​
541
542
543 == 2.5  Datalog Feature ==
544
545
546 LTC2 will auto get the time from LoRaWAN server during Join, and each uplink will then include a timestamp. When user want to retrieve sensor value, user can send a poll command from the IoT platform to ask sensor to send value in the required time slot.
547
548
549 === 2.5.1  Unix TimeStamp ===
550
551
552 LTC2 uses Unix TimeStamp format based on
553
554 [[image:1655694312268-590.png]]
555
556
557 Users can get this time from the link:  [[https:~~/~~/www.epochconverter.com/>>url:https://www.epochconverter.com/]] :
558
559 Below is the converter example
560
561 [[image:1655694332878-202.png]]
562
563
564 (((
565 So, we can use AT+TIMESTAMP=1611889405 or downlink 3060137afd00 to set current time 2021 – Jan ~-~- 29 Friday 03:03:25
566 )))
567
568
569 === 2.5.2  Set Device Time ===
570
571
572 (((
573 (((
574 There are two ways to set the device's time:
575 )))
576 )))
577
578 (((
579 (((
580 (% style="color:#4f81bd" %)**1. Through LoRaWAN MAC Command (Default settings)**
581 )))
582 )))
583
584 (((
585 (((
586 Users need to set SYNCMOD=1 to enable sync time via the MAC command.
587 )))
588 )))
589
590 (((
591 Once LTC2 Joined LoRaWAN network, it will send the MAC command (DeviceTimeReq) and server will reply with (DeviceTimeAns) to send the current time to LTC2. If LTC2 fails to get the time from server, LTC2 will use the internal time and wait for next time request (AT+SYNCTDC to set time request period, default is 10 days).
592
593
594 )))
595
596 (((
597 (((
598 (% style="color:red" %)**Note**(%%): (% style="color:#4f81bd" %)LoRaWAN Server needs to support LoRaWAN v1.0.3(MAC v1.0.3) (%%)or higher to support this MAC command feature, Chirpstack,TTN v3 and loriot support but TTN v2 doesn't support. If server doesn't support this command, it will through away uplink packet with this command, so user will lose the packet with time request for TTN v2 if SYNCMOD=1.
599
600
601 )))
602
603 (((
604 (% style="color:#4f81bd" %)**2. Manually Set Time**
605 )))
606
607 (((
608 Users need to set SYNCMOD=0 to manual time, otherwise, the user set time will be overwritten by the time set by the server.
609 )))
610 )))
611
612
613 === 2.5.3  Poll sensor value ===
614
615
616 Users can poll sensor values based on timestamps. Below is the downlink command.
617
618 (% border="1" cellspacing="4" style="background-color:#ffffcc; color:green; width:431px" %)
619 |=(% colspan="4" style="width: 428px;" %)**Downlink Command to poll Open/Close status (0x31)**
620 |(% style="width:60px" %)**1byte**|(% style="width:127px" %)**4bytes**|(% style="width:122px" %)**4bytes**|(% style="width:116px" %)**1byte**
621 |(% style="width:60px" %)31|(% style="width:127px" %)Timestamp start|(% style="width:122px" %)Timestamp end|(% style="width:116px" %)Uplink Interval
622
623 (((
624
625 )))
626
627 (((
628 Timestamp start and Timestamp end use Unix TimeStamp format as mentioned above. Devices will reply with all data log during this time period, use the uplink interval.
629
630 For example, downlink command[[image:image-20220620111056-7.png]]
631 )))
632
633 (((
634 Is to check 2021/5/16 01:00:00 to 2021/5/16 02:00:00's data
635
636 Uplink Internal =10s，means LTC2 will send one packet every 10s. range 5~~255s.
637 )))
638
639
640 === 2.5.4  Datalog Uplink payload ===
641
642
643 When server senser a datalog polling to LTC2, LTC2 will reply with one or more uplink messages as reply. Each uplink message includes multiply data entries value. Each entry has the same payload format as[[ normal uplink payload>>||anchor="H2.4A0200BUplinkPayload"]].
644
645
646 (% style="color:red" %)**Note:**
647
648 * Poll Message Flag is set to 1.
649 * Each data entry is 11 bytes, to save airtime and battery, devices will send max bytes according to the current DR and Frequency bands.
650
651 For example, in US915 band, the max payload for different DR is:
652
653 1. **DR0: **max is 11 bytes so one entry of data
654 1. **DR1:** max is 53 bytes so devices will upload 4 entries of data (total 44 bytes)
655 1. **DR2:** total payload includes 11 entries of data
656 1. **DR3:** total payload includes 22 entries of data.
657
658 If devise doesn't have any data in the polling time. Device will uplink 11 bytes of 0   
659
660
661 **Example:**
662
663 If LTC2 has below data inside Flash:
664
665 [[image:image-20220620134635-9.png]]
666
667
668 If user send below downlink command:
669
670 **3160A06E9060A098C00A**
671
672 Where : Start time: 60A06E90 = time 21/5/16 01:00:00
673
674 Stop time: 60A098C0 = time 21/5/16 04:00:00
675
676
677 LTC2 will uplink this payload.
678
679
680 [[image:image-20220620111850-8.png]]
681
682
683 (% style="color:red" %)**0E64410B49800160A072B8**(%%)0E61410B3F800160A077680E61410B33800160A07C180E64410B2C800160A080C80E64410B28800160A085780E64410B24800160A08A280E64410B23800160A08ED80E64410B22800160A09388(% style="color:red" %)**0E64410B1E800160A09838**
684
685
686 Where the first 11 bytes is for the first entry:
687
688 (% style="color:red" %)**0E64410B49800160A072B8**
689
690 Bat voltage:0x0E64 =3684mV
691
692
693 poll message flag & Ext=0x41,means reply data,Ext=1
694
695 Channel1 temp=0x0B49/100=28.89℃
696
697 Channel2 temp=0x8001/100=-327.67℃
698
699 System timestamp=0x60A072B8= 1621127864(UTC)
700
701
702 == 2.6  ​Alarm Mode ==
703
704
705 (((
706 LTC2 can monito the temperature in every CTTEMP time, when the temperature exceed the limit , it will uplink the sensor value immediately.
707
708 Detail commands see:
709
710 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Enable Alarm Mode**>>||anchor="H3.9EnableAlarmmode"]]
711 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Config Alarm Sampling Time**>>||anchor="H3.10Alarmchecktime"]]
712 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Set Alarm Threshold**>>||anchor="H3.11SetAlarmThreshold"]]
713
714
715 )))
716
717
718 = 3.  Configure LTC2 via AT Command or LoRaWAN Downlink =
719
720
721 (((
722 (((
723 Use can configure LTC2 via AT Command or LoRaWAN Downlink.
724 )))
725 )))
726
727 * (((
728 (((
729 AT Command Connection: See [[FAQ>>||anchor="H6.A0FAQ"]].
730 )))
731 )))
732 * (((
733 (((
734 LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]]
735 )))
736 )))
737
738 (((
739 (((
740
741 )))
742
743 (((
744 There are two kinds of commands to configure LTC2, they are:
745 )))
746 )))
747
748 * (((
749 (((
750 (% style="color:#4f81bd" %)** General Commands**.
751 )))
752 )))
753
754 (((
755 (((
756 These commands are to configure:
757 )))
758 )))
759
760 * (((
761 (((
762 General system settings like: uplink interval.
763 )))
764 )))
765 * (((
766 (((
767 LoRaWAN protocol & radio related command.
768 )))
769 )))
770
771 (((
772 (((
773 They are same for all Dragino Device which support DLWS-005 LoRaWAN Stack. These commands can be found on the wiki: [[End Device AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
774 )))
775 )))
776
777 (((
778 (((
779
780 )))
781 )))
782
783 * (((
784 (((
785 (% style="color:#4f81bd" %)** Commands special design for LTC2**
786 )))
787 )))
788
789 (((
790 (((
791 These commands only valid for LTC2, as below:(% title="Click and drag to resize" %)​
792 )))
793 )))
794
795 (% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" title="Click and drag to resize" %)​
796
797
798 == 3.1  Set Transmit Interval Time ==
799
800
801 Feature: Change LoRaWAN End Node Transmit Interval.
802
803 (% style="color:#037691" %)**AT Command: AT+TDC**
804
805 (% aria-label="image-20220610173409-7.png image widget" contenteditable="false" role="region" tabindex="-1" %)[[image:image-20220610173409-7.png||data-widget="image"]](% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)​(%%)​
806
807
808 (((
809 (% style="color:#037691" %)**Downlink Command: 0x01**
810 )))
811
812 (((
813 (((
814 Format: Command Code (0x01) followed by 3 bytes time value.
815
816 (((
817 If the downlink payload=0100003C, it means set the END Node's Transmit Interval to 0x00003C=60(S), while type code is 01.
818 )))
819
820 * Example 1: Downlink Payload: 0100001E  ~/~/  Set Transmit Interval (TDC) = 30 seconds
821 * Example 2: Downlink Payload: 0100003C  ~/~/  Set Transmit Interval (TDC) = 60 seconds
822 )))
823 )))
824
825
826
827 == 3.2  Enable PT100 channels ==
828
829
830 Feature: Enable PT100 channels. Default only Enable Channel 1
831
832 (% style="color:#037691" %)**AT Command: AT+ENPTCHNUM**
833
834 (% border="1" cellspacing="4" style="background-color:#ffffcc; color:green; width:494px" %)
835 |=(% style="width: 164px;" %)**Command Example**|=(% style="width: 254px;" %)**Function**|=(% style="width: 74px;" %)**Response**
836 |(% style="width:164px" %)AT+ENPTCHNUM=?|(% style="width:254px" %)Get current ENPTCHNUM settings|(% colspan="1" rowspan="3" style="width:74px" %)(((
837 1
838
839 OK
840 )))
841 |(% style="width:164px" %)AT+ ENPTCHNUM =1|(% colspan="1" style="width:254px" %)Enable channel 1
842 |(% style="width:164px" %)AT+ ENPTCHNUM =2|(% colspan="1" style="width:254px" %)Enable channel 1 and 2
843
844 (% style="color:#037691" %)**Downlink Command: 0xA1**
845
846 Total bytes: 2 bytes
847
848 Example:
849
850 * 0xA101: same as AT+ENPTCHNUM =1
851 * 0xA102: same as AT+ENPTCHNUM =2
852
853
854
855 == 3.3  Set External Sensor Mode ==
856
857
858 (((
859 Feature: Change External Sensor Mode.
860 )))
861
862 (((
863 (% style="color:#037691" %)**Downlink Command: AT+EXT**
864 )))
865
866 (% border="1" cellspacing="4" style="background-color:#ffffcc; color:green; width:431px" %)
867 |=(% style="width: 155px;" %)**Command Example**|=(% style="width: 180px;" %)**Function**|=(% style="width: 86px;" %)**Response**
868 |(% style="width:155px" %)AT+EXT=?|(% style="width:180px" %)Get current EXT settings|(% colspan="1" rowspan="4" style="width:86px" %)(((
869 1
870
871 OK
872 )))
873 |(% style="width:155px" %)AT+EXT=1|(% colspan="1" style="width:180px" %)Set EXT to 0b(0001)
874 |(% style="width:155px" %)AT+EXT=2|(% colspan="1" style="width:180px" %)Set EXT to 0b(0010)
875 |(% style="width:155px" %)AT+EXT=3|(% colspan="1" style="width:180px" %)Set EXT to 0b(0011)
876
877 (% style="color:#037691" %)**Downlink Command: 0xA2**
878
879 Total bytes: 2 bytes
880
881 Example:
882
883 * 0xA201: same as AT+EXT=1
884
885
886
887 == 3.4 Quit AT Command ==
888
889
890 Feature: Quit AT Command mode, so user need to input password again before use AT Commands.
891
892 (% style="color:#037691" %)**AT Command: AT+DISAT**
893
894 (% border="1" cellspacing="4" style="background-color:#ffffcc; color:green; width:446px" %)
895 |=(% style="width: 161px;" %)**Command Example**|=(% style="width: 193px;" %)**Function**|=(% style="width: 87px;" %)**Response**
896 |(% style="width:161px" %)AT+DISAT|(% style="width:193px" %)Quit AT Commands mode|(% style="width:87px" %)OK
897
898 (% style="color:#037691" %)**Downlink Command:**
899
900 No downlink command for this feature.
901
902
903 == 3.5 Set system time ==
904
905
906 Feature: Set system time, unix format. [[See here for formmat detail.>>||anchor="H2.5.1A0UnixTimeStamp"]]
907
908 (% style="color:#037691" %)**AT Command:**
909
910 (% border="1" cellspacing="4" style="background-color:#ffffcc; color:green; width:506px" %)
911 |=(% style="width: 218px;" %)**Command Example**|=(% style="width: 285px;" %)**Function**
912 |(% style="width:218px" %)AT+TIMESTAMP=1611104352|(% style="width:285px" %)(((
913 OK
914
915 Set System time to 2021-01-20 00:59:12
916 )))
917
918 (% style="color:#037691" %)**Downlink Command:**
919
920 0x306007806000  ~/~/ Set timestamp to 0x(6007806000),Same as AT+TIMESTAMP=1611104352
921
922
923 == 3.6 Set Time Sync Mode ==
924
925
926 Feature: Enable/Disable Sync system time via LoRaWAN MAC Command (DeviceTimeReq), LoRaWAN server must support v1.0.3 protocol to reply this command.
927
928 SYNCMOD is set to 1 by default. If user want to set a different time from LoRaWAN server, user need to set this to 0.
929
930
931 (% style="color:#037691" %)**AT Command:**
932
933 (% border="1" cellspacing="4" style="background-color:#ffffcc; color:green; width:473px" %)
934 |=(% style="width: 157px;" %)**Command Example**|=(% style="width: 313px;" %)**Function**
935 |(% style="width:157px" %)AT+SYNCMOD=1|(% style="width:313px" %)Enable Sync system time via LoRaWAN MAC Command (DeviceTimeReq)
936
937 (% style="color:#037691" %)**Downlink Command:**
938
939 0x28 01  ~/~/ Same As AT+SYNCMOD=1
940
941 0x28 00  ~/~/ Same As AT+SYNCMOD=0
942
943
944 == 3.7 Set Time Sync Interval ==
945
946
947 Feature: Define System time sync interval. SYNCTDC default value: 10 days.
948
949 (% style="color:#037691" %)**AT Command:**
950
951 (% border="1" cellspacing="4" style="background-color:#ffffcc; color:green; width:469px" %)
952 |=**Command Example**|=(% style="width: 306px;" %)**Function**
953 |AT+SYNCTDC=0x0A|(% style="width:306px" %)Set SYNCTDC to 10 (0x0A), so the sync time is 10 days.
954
955 (% style="color:#037691" %)**Downlink Command:**
956
957 0x29 0A  ~/~/ Same as AT+SYNCTDC=0x0A
958
959
960 == 3.8 Retrieve data ==
961
962
963 Feature: Retrieval data for specify time slot.
964
965 (% style="color:#037691" %)**AT Command**(%%)**:**
966
967 No AT Command, only valid for downlink command.
968
969
970 (% style="color:#037691" %)**Downlink Command:**
971
972 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
973
974
975 == 3.9 Enable Alarm mode ==
976
977
978 Feature: Enable Alarm Mode.
979
980 (% style="color:#037691" %)**AT Command: AT_WMOD**
981
982 Total bytes: 2
983
984 Example:
985
986 0xA500: AT+WMOD=0(default)
987
988 0xA501: AT+WMOD=1(alarm mode)
989
990
991 (% style="color:#037691" %)**Downlink Command:**
992
993 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
994
995
996 == 3.10 Alarm check time ==
997
998
999 Feature: The time interval to check sensor value for Alarm.
1000
1001 (% style="color:#037691" %)**AT Command: AT+CITEMP**
1002
1003 Total bytes: 3
1004
1005 Example:
1006
1007 0xA60001: AT+CITEMP=1(default)
1008
1009 Set collection interval in 1min,only in alarm mode
1010
1011
1012 (% style="color:#037691" %)**Downlink Command:**
1013
1014 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
1015
1016
1017 == 3.11 Set Alarm Threshold ==
1018
1019
1020 Feature: Set Alarm Threshold.
1021
1022 (% style="color:#037691" %)**AT Command: AT+ARTEMP**
1023
1024 Total bytes: 9  Unit: ℃
1025
1026 Example:
1027
1028 A7FF380320FF380320
1029
1030 AT+ARTEMP=-200,800,-200,800
1031
1032
1033 A7000A0064000A0065
1034
1035 AT+ARTEMP=10,100,10,101
1036
1037 Channel 1 operating temp:10~~100
1038
1039 Channel 2 operating temp:10~~101
1040
1041
1042 (% style="color:#037691" %)**Downlink Command:**
1043
1044 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
1045
1046
1047 == 3.12 Set Calibrate Value ==
1048
1049
1050 Feature: Set Calibrate value for PT100 cable.  Detail of use of this command please see [[connect to a customized PT100 Probe>>||anchor="H6.2A0HowtoconnectacustomizedPT100cable3F"]].
1051
1052 (% style="color:#037691" %)**AT Command: AT+RCABLE**
1053
1054 Total bytes: 5
1055
1056 Example:
1057
1058 AT+RCABLE=296,300
1059
1060 Channel 1 rcable=0x0128/1000=0.296R
1061
1062 Channel 2 rcable=0x012C/1000=0.300R
1063
1064
1065 (% style="color:#037691" %)**Downlink Command:**
1066
1067 0xA80128012C  ~-~->  Same as AT+RCABLE=296,300
1068
1069
1070 == 3.13 Poll Calibrate Value ==
1071
1072
1073 Feature: Poll Calibrate value. LTC2 will reply with this command send an uplink to server.
1074
1075 (% style="color:#037691" %)**AT Command: No AT Command.**
1076
1077
1078 (% style="color:#037691" %)**Downlink Command:**
1079
1080 Example: A901
1081
1082 End nodes will send racable config to server
1083
1084 Like uplink payload: 010128012C
1085
1086
1087 == 3.14 Print data entries base on page ==
1088
1089
1090 Feature: Print the sector data from start page to stop page (max is 400 pages).
1091
1092 (% style="color:#037691" %)**AT Command: AT+PDTA**
1093
1094 [[image:image-20220620145822-10.png]]
1095
1096
1097 (% style="color:#037691" %)**Downlink Command:**
1098
1099 No downlink commands for feature
1100
1101
1102 == 3.15 Print last few data entries ==
1103
1104
1105 Feature: Print the last few data entries
1106
1107 (% style="color:#037691" %)**AT Command: AT+PLDTA**
1108
1109 [[image:image-20220620145916-11.png]]
1110
1111
1112 (% style="color:#037691" %)**Downlink Command:**
1113
1114 No downlink commands for feature
1115
1116
1117 == 3.16 Clear Flash Record ==
1118
1119
1120 Feature: Clear flash storage for data log feature.
1121
1122 (% style="color:#037691" %)**AT Command: AT+CLRDTA**
1123
1124 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:511px" %)
1125 |=(% style="width: 157px;" %)**Command Example**|=(% style="width: 136px;" %)**Function**|=(% style="width: 213px;" %)**Response**
1126 |(% style="width:157px" %)AT+CLRDTA|(% style="width:136px" %)Clear date record|(% style="width:213px" %)(((
1127 Clear all stored sensor data…
1128
1129 OK
1130 )))
1131
1132 (% style="color:#037691" %)**Downlink Command: 0xA3**
1133
1134 * Example: 0xA301  ~/~/  Same as AT+CLRDTA
1135
1136
1137 = 4.  Battery & Power Consumption =
1138
1139
1140 LTC2 uses ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.
1141
1142 [[**Battery Info & Power Consumption Analyze**>>url:http://wiki.dragino.com/xwiki/bin/view/Main/How%20to%20calculate%20the%20battery%20life%20of%20Dragino%20sensors%3F/]] .
1143
1144
1145 = 5.  Firmware Change Log and Upload Firmware =
1146
1147 = (% style="display:none" %) (%%) =
1148
1149 (((
1150 User can use ST-Link v2 to upgrade firmware into LTC2 for bug fix or new features. The hardware connection for upgrade firmware is as below:
1151 )))
1152
1153 (((
1154
1155 )))
1156
1157 (((
1158 **Connection:**
1159 )))
1160
1161 * (((
1162 (% style="background-color:yellow" %)**ST-LINK v2 GND  <~-~->  LTC2 GND**
1163 )))
1164 * (((
1165 (% style="background-color:yellow" %)**ST-LINK v2 RESET  <~-~->  LTC2 NRST**
1166 )))
1167 * (((
1168 (% style="background-color:yellow" %)**ST-LINK v2 SWCLK  <~-~->  LTC2 SWCLK**
1169 )))
1170 * (((
1171 (% style="background-color:yellow" %)**ST-LINK v2 SWDIO  <~-~->  LTC2 SWDIO**
1172 )))
1173 * (((
1174 (% style="background-color:yellow" %)**LTC2 power must be on.  **
1175 )))
1176
1177 (((
1178
1179
1180 **Firmware Location and Change Log:  **[[https:~~/~~/www.dropbox.com/sh/8ghh32xavvsr98l/AADg-NbTnq80Re4Bcj7uekJFa?dl=0>>https://www.dropbox.com/sh/8ghh32xavvsr98l/AADg-NbTnq80Re4Bcj7uekJFa?dl=0]]
1181
1182
1183 )))
1184
1185 = 6.  FAQ =
1186
1187 == 6.1  How to use AT Command to configure LTC2 ==
1188
1189
1190 LTC2 supports AT Command set. User can use a USB to TTL adapter plus the Program Cable to connect to LTC2 for using AT command, as below.
1191
1192
1193 **Connection:**
1194
1195 * (% style="background-color:yellow" %)**USB to TTL GND <~-~->  LTC2 GND**
1196 * (% style="background-color:yellow" %)**USB to TTL RXD  <~-~->  LTC2 TXD**
1197 * (% style="background-color:yellow" %)**USB to TTL TXD  <~-~->  LTC2 RXD**
1198
1199 (((
1200 In PC, User needs to set (% style="color:blue" %)**serial tool**(%%)(such as [[putty>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to (% style="color:green" %)**9600**(%%) to access to access serial console for LTC2. The AT commands are disable by default and need to enter password (default: (% style="color:green" %)**123456**)(%%) to active it. Timeout to input AT Command is 5 min, after 5-minute, user need to input password again. User can use AT+DISAT command to disable AT command before timeout.
1201 )))
1202
1203 (((
1204
1205 )))
1206
1207 (((
1208 Input password and ATZ to activate LTC2,As shown below:
1209 )))
1210
1211 [[image:image-20220620151601-13.png||height="454" width="1204"]]
1212
1213
1214 == 6.2  How to connect a customized PT100 cable? ==
1215
1216
1217 (((
1218 The LTC2 has two channels means it can connect 2 x PT100 cables. Besides use the PT100 cables provided by Dragino, User can connect their PT100 probes. When connect to a user PT100 probe, we recommend that user do a calibration to eliminate the effect from the cables so to get the best accuracy. Below is the step for calibrate on a (% style="color:blue" %)**three wire PT100** (%%)probes. There is no step for 2 wire probe calibration at the moment. 
1219 )))
1220
1221 (((
1222
1223 )))
1224
1225 (((
1226 (% style="color:blue" %)**Step 1**(%%)**: **You need a multimeter can measure the accuracy of 0.001 ohm. We use Agilent 34401A digit multimeter. And will do test to make sure the multimeter accuracy before the measurement. Check the shortcut resistance of the multimeter.
1227 )))
1228
1229 [[image:image-20220620152115-14.jpeg||height="548" width="763"]]
1230
1231 We know that the Multimeter has a shortcut resistance 0.002 ohm.
1232
1233
1234 (% style="color:blue" %)**Step 2**(%%): Measure the resistance between the two shorted wires of PT100 Probe.
1235
1236
1237 [[image:image-20220620152115-15.jpeg||height="791" width="704"]]
1238
1239 As example, in this step, we check the shorted wire (both red) with 0.594 ohm, So we know that each wire of PT100 has (0.594-0.002)/2=0.296R (Where 0.002 is the value we got from step 1) .
1240
1241
1242 (% style="color:blue" %)**Step 3**(%%): Run Calibrate Command.
1243
1244 Run this command to both channels to use 0.296R calibrate resistance.
1245
1246 (% style="color:red" %)**AT+RCABLE=296,0** (%%) ~-~->  Calibrate Channel 1 with 0.296R
1247
1248
1249 Or use LoRaWAN downlink command (0xA8 Code) to set:
1250
1251 0xA801280000
1252
1253
1254 User can use 0xA9 downlink command to poll the current calibration value.
1255
1256
1257 (% style="color:blue" %)**Step 4**(%%)**: **Connect the PT100 to LTC2
1258
1259 [[image:image-20220620152115-16.png]]
1260
1261
1262 For a 3 wire PT100, there are two wire are shortcut, for example, as per above photo Channel 1, there are two red wire , which are shortcut in PT100, connect them as the photo. The 3^^rd^^ wire (white wire ) connect to the left pin of Channel -1.
1263
1264
1265 == 6.3  What is the frequency range of LTC2 LoRa part? ==
1266
1267
1268 Different LTC2 version supports different frequency range, below is the table for the working frequency and recommend bands for each model:
1269
1270 [[image:image-20220620151440-12.png]]
1271
1272
1273 == 6.4  How to change the LoRa Frequency Bands/Region ==
1274
1275
1276 You can follow the instructions for [[how to upgrade image>>||anchor="H5.A0FirmwareChangeLogandUploadFirmware"]].
1277 When downloading the images, choose the required image file for download. ​
1278
1279
1280 = 7.  Trouble Shooting =
1281
1282 == 7.1  AT Command input doesn't work ==
1283
1284
1285 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.
1286
1287
1288 = 8.  Order Info =
1289
1290
1291 Part Number **:** (% style="color:blue" %)**LTC2-XXX-YYY**
1292
1293 (% style="color:#0000ff" %)**XXX**(%%)**: **Probe Version
1294
1295 * (% style="color:red" %)**SI**(%%):  Standard IP68 probe x 1
1296 * (% style="color:red" %)**LT**(%%):  Low Temperature probe x 1
1297 * (% style="color:red" %)**HT**(%%): High Temperature probe x 1
1298 * (% style="color:red" %)**FSA**(%%):  Food Safety probe x 1
1299 * (% style="color:red" %)**FT**(%%):  Flat Type probe x 1
1300 * (% style="color:red" %)**NA**(%%): No probe
1301
1302 (% style="color:#0000ff" %)**YYY**(%%)**: **The default frequency band
1303
1304 * (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band
1305 * (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band
1306 * (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band
1307 * (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band
1308 * (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band
1309 * (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band
1310 * (% style="color:red" %)**IN865 **(%%)**:**  LoRaWAN IN865 band
1311 * (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band
1312
1313
1314
1315 = 9. ​ Packing Info =
1316
1317
1318 **Package Includes**:
1319
1320 * LTC2 LoRaWAN Temperature Transmitter x 1
1321
1322 **Dimension and weight**:
1323
1324 * Device Size: cm
1325 * Device Weight: g
1326 * Package Size / pcs : cm
1327 * Weight / pcs : g
1328
1329
1330
1331 = 10.  ​Support =
1332
1333
1334 * 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.
1335 * 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]].
1336
1337

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