Last modified by Bei Jinggeng on 2025/03/03 13:49
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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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6 (% style="text-align:center" %)
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 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.
41 )))
42
43 (((
44 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.
45 )))
46
47 (((
48 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.
49 )))
50
51
52 [[image:image-20220617164020-3.png||height="314" width="756"]]
53 )))
54 )))
55
56
57 == ​1.2  Features ==
58
59
60 * LoRaWAN v1.0.3 Class A
61 * max: 2 x monitor temperature channels
62 * Support 3 -wire PT-100
63 * 8500mAh Li-SOCI2 Battery
64 * Firmware upgrade via console
65 * Wall Mountable
66 * Configurable via LoRa or UART
67 * Use pre-load PT100 probe or 3rd PT100 probe
68 * Factory calibration for different resistance range
69 * Support accuracy measure of resistance and upload
70 * Battery Monitoring and upload
71 * Operation Temperature: -40 ~~ 65 ℃
72
73 (% style="display:none" %) ** **
74
75
76 == 1.3 ​ Applications ==
77
78
79 * Logistics and Supply Chain Management
80 * Food management
81 * Cold chains solution
82 * Industrial Monitoring and Control
83
84 == 1.4 Hardware Change log ==
85
86
87 LTC2 v1.0: Release.
88
89
90 == 1.5  Pin Definitions and Switch ==
91
92 === (% title="Click and drag to resize" %)1.5.1  J(%%)umper JP2 ( Power ON) ===
93
94 (% class="wikigeneratedid" id="H200B200B200B200B" %)
95 (% 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" %)​(%%)​
96
97 Put a jumper on JP2 will power on the LTC2.
98
99
100 === 1.5.2  LED ===
101
102
103 The LED will flash in below case.
104
105 (((
106 1.  Send an uplink packet
107
108
109 )))
110
111 === 1.5.3  PT100 Interfaces ===
112
113
114 (((
115 There are two independent channels to connect 2 x PT100 probes.
116 )))
117
118 (((
119 Each channel has 3-wire connection for 3-wire PT100 probes.
120 )))
121
122
123 === 1.5.4  Reset Button ===
124
125
126 Press this button will reboot the LTC2
127
128
129 == 1.6  Probe Variant ==
130
131
132 LTC2 provide default probe version. See below for the variant:
133
134
135 (% border="1" cellspacing="4" style="width:505px" %)
136 |=(% style="width: 78px;background-color:#4F81BD;color:white" %)(((
137 **Model**
138 )))|=(% style="width: 127px;background-color:#4F81BD;color:white" %)(((
139 **Photo**
140 )))|=(% style="width: 300px;background-color:#4F81BD;color:white" %)(((
141 **Description**
142 )))
143 |(% style="width:78px" %)(((
144 LTC2-SI
145 )))|(% style="width:117px" %)(((
146 (% style="text-align:center" %)
147 [[image:1655458404877-785.png]]
148 )))|(% style="width:314px" %)(((
149 Standard IP68 Probe Version
150
151 * (((
152 LTC2 with 1 x Standard IP68 PT100 probe.
153 )))
154 * (((
155 Installation: Insert
156 )))
157 * (((
158 Cable Length : 2m
159 )))
160 * (((
161 PT100 Class : Class A
162 )))
163 * (((
164 Probe Dimension: 4*30mm
165 )))
166 * (((
167 Measure Range: -50 ~~ 200 °C
168 )))
169 * (((
170 Suitable Environment: General environment
171 )))
172 )))
173 |(% style="width:78px" %)(((
174 LTC2-LT
175 )))|(% style="width:117px" %)(((
176 (% style="text-align:center" %)
177 [[image:image-20220617172838-2.png]]
178 )))|(% style="width:314px" %)(((
179 Low Temperature Version
180
181 * (((
182 LTC2 with 1 x Low Temperature PT100 probe.
183 )))
184 * (((
185 Installation: Insert
186 )))
187 * (((
188 Cable Length : 2m
189 )))
190 * (((
191 PT100 Class : Class A
192 )))
193 * (((
194 Probe Dimension: 4*30mm
195 )))
196 * (((
197 Measure Range: -196 ~~ 150 °C
198 )))
199 * (((
200 Suitable Environment: Low temperature measurement, such as COVID vaccine transport
201 )))
202 )))
203 |(% style="width:78px" %)(((
204 LTC2-FS
205 )))|(% style="width:117px" %)(((
206 (% style="text-align:center" %)
207 [[image:image-20220617172838-3.png]]
208 )))|(% style="width:314px" %)(((
209 Food Safety Version
210
211 * (((
212 LTC2 with 1 x Food Safety PT100 probe.
213 )))
214 * (((
215 Installation: Insert
216 )))
217 * (((
218 Cable Length : 2m
219 )))
220 * (((
221 PT100 Class : Class A
222 )))
223 * (((
224 Probe Dimension: 4*150mm
225 )))
226 * (((
227 Measure Range: -50 ~~ 200 °C
228 )))
229 * (((
230 Suitable Environment: Food temperature measurement
231 )))
232 )))
233 |(% style="width:78px" %)LTC-FSA|(% style="width:117px" %)(((
234 (% style="text-align:center" %)
235 [[image:image-20221222182717-1.jpeg]]
236 )))|(% style="width:314px" %)(((
237 Food Safety Version
238
239 * (((
240 LTC2 with 1 x Food Safety PT100 probe.
241 )))
242 * (((
243 Installation: Insert
244 )))
245 * (((
246 Cable Length : 2m
247 )))
248 * (((
249 PT100 Class : Class A
250 )))
251 * (((
252 Probe Dimension: 4*150mm
253 )))
254 * (((
255 Measure Range: -50 ~~ 200 °C
256 )))
257 * (((
258 Suitable Environment: Food temperature measurement
259 )))
260 )))
261 |(% style="width:78px" %)(((
262 LTC2-FT
263 )))|(% style="width:117px" %)(((
264 (% style="text-align:center" %)
265 [[image:image-20220617172838-4.png]]
266 )))|(% style="width:314px" %)(((
267 Flat Type Version
268
269 * LTC2 with 1 x Flat Type PT100 probe.
270 * Installation: Attached
271 * Cable Length : 2m
272 * PT100 Class : Class A
273 * Probe Dimension: 8*25mm
274 * Measure Range: -50 ~~ 200 °C
275 * Suitable Environment: Attached to the measure point.
276 )))
277 |(% style="width:78px" %)LTC2-HT|(% style="width:117px" %)(((
278 (% style="text-align:center" %)
279 [[image:image-20250212084650-1.png||height="112" width="80"]]
280 )))|(% style="width:314px" %)(((
281 High Temperature Version
282
283 * LTC2 with 1 x high temperature PT100 probe.
284 * Installation: Insert
285 * Cable Length : 3m
286 * PT100 Class : Class A
287 * Probe Dimension: 4*30mm
288 * Measure Range: -70 ~~ 450 °C
289
290 Suitable Environment: High Temperature
291 )))
292 |(% style="width:78px" %)LTC2-NA|(% style="width:117px" %)(((
293 (% style="text-align:center" %)
294 [[image:image-20220617172838-6.png]]
295 )))|(% style="width:314px" %)(((
296 No Probe version:
297
298 * User can connect to their own PT100 Probe
299 * Grand Hole: M12
300 * Suitable Environment:
301
302 Connect to customized probe
303 )))
304
305 = 2.  How to use LTC2? =
306
307 == 2.1  Connect to PT100 sensors ==
308
309
310 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"]](%%).
311
312
313 == 2.2  How it works? ==
314
315
316 (((
317 (((
318 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**.
319 )))
320
321 (((
322 On each uplink, LTC2 will check its two ADC Interfaces and get the temperature from the sensor and send out to server.
323 )))
324 )))
325
326
327 == 2.3  ​Quick guide to connect to LoRaWAN server (OTAA) ==
328
329
330 (((
331 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.
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333 (% 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||height="311" width="751"]]
334 )))
335
336 (% 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" %)​(%%)​
337
338 (((
339
340
341 === 2.3.1 Step 1: Create a device in TTN with the OTAA keys from LTC2 ===
342
343
344 Below is TTN screen shot:
345
346 * Create Application first.
347 * Manually Add a LoRaWAN End Device device. Choose **OTAA** and **MAC v1.0.3**
348
349 [[image:1655690861020-685.png]]
350
351
352 [[image:1655690877643-259.png]]
353
354
355 Input the OTAA keys for LTC2.
356
357 Each LTC2 is shipped with a sticker with the default device EUI as below:
358
359 [[image:image-20230426083905-2.png||height="272" width="586"]]
360
361
362 * **Input these keys to device portal.**
363
364 [[image:image-20220620100853-1.png]]
365
366
367
368 * **Choose the Frequency band for this end node.**
369
370 [[image:image-20220620100853-2.png]]
371
372
373 * **Input APP Key in this page as well. **
374
375 [[image:image-20220620100853-3.png]]
376
377
378 Add payload formatter So TTNv3 knows how to parse the LTC2 upload value.
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||height="496" width="1097"]]
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 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.
399 )))
400
401 (((
402 Below is an example uplink message which shows the LTC2 is sending Join Request to TTNv3.
403 )))
404
405
406 [[image:1655691086647-147.png]]
407
408
409 After join successful, LTC2 will send uplink message with the sensor value.
410
411 [[image:1655691100066-163.png]]
412
413 Above value shows Channel1 detect 25.94 degree. There is no PT100 connected on Channel 2, so it shows -327.67.
414 )))
415
416
417 == 2.4  ​Uplink Payload ==
418
419
420 Below is the uplink payload which shows.
421
422 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:390px" %)
423 |=(% style="width: 70px;background-color:#4F81BD;color:white" %)(((
424 **Size(bytes)**
425 )))|=(% style="width: 40px;background-color:#4F81BD;color:white" %)**2**|=(% style="width: 70px;background-color:#4F81BD;color:white" %)**1**|=(% style="width: 70px;background-color:#4F81BD;color:white" %)2|=(% style="width: 70px;background-color:#4F81BD;color:white" %)2|=(% style="width: 70px;background-color:#4F81BD;color:white" %)**4**
426 |(% style="width:62.5px" %)Value|(((
427 [[BAT>>||anchor="HBAT"]]
428 )))|(((
429 [[Status & EXT>>||anchor="HStatus26EXT"]]
430 )))|(((
431 [[Channel 1 data>>||anchor="HChannel1dataandChannel2data"]]
432 )))|(((
433 [[Channel 2 data>>||anchor="HChannel1dataandChannel2data"]]
434 )))|(((
435 [[Unix TimeStamp>>||anchor="HUnixTimeStamp"]]
436 )))
437
438 (% 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"]]
439
440
441 (((
442 === (% style="color:blue" %)**BAT**(%%) ===
443
444
445 Ex1: 0x0E3C ⇒ 3644 (mV) = 3.644 V
446
447 (% class="wikigeneratedid" %)
448
449 )))
450
451 (((
452 === (% style="color:blue" %)**Status & EXT**(%%) ===
453 )))
454
455 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:500px" %)
456 |(% style="background-color:#4f81bd; color:white; width:60px" %)**Bits**|(% style="background-color:#4f81bd; color:white; width:90px" %)**7**|(% style="background-color:#4f81bd; color:white; width:100px" %)**6**|(% style="background-color:#4f81bd; color:white; width:90px" %)**5**|(% style="background-color:#4f81bd; color:white; width:100px" %)**4**|(% style="background-color:#4f81bd; color:white; width:60px" %)**[3:0]**
457 |(% style="width:96px" %)Status&Ext|(% style="width:124px" %)Not Defined|(% style="width:146px" %)Poll Message FLAG|(% style="width:109px" %)Sync time OK|(% style="width:143px" %)Unix Time Request|(% style="width:106px" %)Ext: 0b(1001)
458
459 * (% style="color:#037691" %)**Poll Message Flag**(%%):  1: This message is a poll message reply, 0: means this is a normal uplink.
460 * (% 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.
461 * (% 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)
462 * (% style="color:#037691" %)**EXT**(%%):  The decode method for Channel 1 data and Channel 2 data
463 ** 0b(0001): Upload PT100 temperature, with 2 decimals, range:  **-327.67 ~~ 327.67 ℃**
464 ** 0b(0010): Upload PT100 temperature, with 1 decimals, range: ** -3276.7 ~~ 3276.7 ℃**
465 ** 0b(0011): Upload Resistance instead of Temperature, range:  **-327.67~~ 327.67 ohm**
466
467 (((
468 (% class="wikigeneratedid" %)
469
470
471
472 === (% style="color:blue" %)**Channel 1 data and Channel 2 data**(%%) ===
473
474 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:515px" %)
475 |(% style="background-color:#4f81bd; color:white; width:150px" %)**Example Payload on channel 1 or channel 2**|(% style="background-color:#4f81bd; color:white; width:130px" %)**Sensor Value when EXT=0b(0001)**|(% style="background-color:#4f81bd; color:white; width:127.5px" %)**Sensor Value when EXT=0b(0010)**|(% style="background-color:#4f81bd; color:white; width:107.5px" %)**Sensor Value when EXT=0b(0011)**
476 |(% style="width:139px" %)0x1422|(% style="width:142px" %)0x1422/100=51.54℃|(% style="width:155px" %)0x1422/100=515.4℃|(% style="width:148px" %)0x1422/100=51.54Ω
477 |(% style="width:139px" %)OXEC2D|(% style="width:142px" %)(0XEC2D-65536)/100=-50.75℃|(% style="width:155px" %)(0XEC2D-65536)/10=-507.5℃|(% style="width:148px" %)0XEC2D/100=604.61Ω
478 )))
479
480 (((
481 (% class="wikigeneratedid" %)
482
483
484 === (% style="color:blue" %)**Unix TimeStamp**(%%) ===
485 )))
486
487 Refer to Datalog feature.
488
489 (% style="color:#037691" %)**Example Uplink Payload**:
490
491
492 **Uplink payload example 1:**  0CE9011422EC2D6073E83B
493
494 * Bat voltage:0x0CE9 =3305mV
495 * Ext=0x01
496 * Channel1 temp=0x1422/100=51.54 ℃
497 * Channel2 temp=(0xEC2D-65536)/100=-50.75 ℃
498 * System timestamp=0x6073E83B= 1618208827(UTC)
499
500 If payload is: EC2DH : (EC2D & 8000 == 1), temp = (EC2DH - 65536)/100 = -50.75 ℃
501
502 (EC2D & 8000: Judge whether the highest bit is 1, when the highest bit is 1, it is negative)
503
504
505 **Uplink payload example 2: ** 0CED020203FE056073E697
506
507 * Bat voltage:0x0CED =3309mV
508 * Ext=0x02
509 * Channel1 temp=0x0203/10=515.4 ℃
510 * Channel2 temp=(0xFE05-65536)/10=-507.5 ℃
511 * System timestamp=0x6073E697=1618208407(UTC)
512
513 If payload is: FE05H :  (FE05 & 8000 == 1) , temp = (FE05H - 65536)/100 = 507.5 ℃
514
515 (EC2D & 8000: Judge whether the highest bit is 1, when the highest bit is 1, it is negative)
516
517
518 **Uplink payload example 3 :**  0CE9032EDE1F406073E967
519
520 * Bat voltage:0x0CE9 =3305mV
521 * Ext=0x03
522 * Channel1 res=0x2EDE/100=119.98 ohm
523 * Channel2 res=0x1F40/100=80.00 ohm
524 * System timestamp=0x6073E967= 1618209127(UTC)
525
526 (% 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" %)​(%%)​
527
528
529 == 2.5  ​Alarm Mode ==
530
531
532 (((
533 LTC2 can monito the temperature in every CTTEMP time, when the temperature exceed the limit , it will uplink the sensor value immediately.
534
535 Detail commands see:
536
537 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Enable Alarm Mode**>>||anchor="H3.9EnableAlarmmode"]]
538 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Config Alarm Sampling Time**>>||anchor="H3.10Alarmchecktime"]]
539 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Set Alarm Threshold**>>||anchor="H3.11SetAlarmThreshold"]]
540
541
542 )))
543
544
545 = 3.  Configure LTC2 via AT Command or LoRaWAN Downlink =
546
547
548 (((
549 (((
550 Use can configure LTC2 via AT Command or LoRaWAN Downlink.
551 )))
552 )))
553
554 * (((
555 (((
556 AT Command Connection: See [[FAQ>>||anchor="H6.A0FAQ"]].
557 )))
558 )))
559 * (((
560 (((
561 LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]]
562 )))
563 )))
564
565 (((
566 (((
567
568 )))
569
570 (((
571 There are two kinds of commands to configure LTC2, they are:
572 )))
573 )))
574
575 * (((
576 (((
577 (% style="color:#4f81bd" %)** General Commands**.
578 )))
579 )))
580
581 (((
582 (((
583 These commands are to configure:
584 )))
585 )))
586
587 * (((
588 (((
589 General system settings like: uplink interval.
590 )))
591 )))
592 * (((
593 (((
594 LoRaWAN protocol & radio related command.
595 )))
596 )))
597
598 (((
599 (((
600 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]]
601 )))
602 )))
603
604 (((
605 (((
606
607 )))
608 )))
609
610 * (((
611 (((
612 (% style="color:#4f81bd" %)** Commands special design for LTC2**
613 )))
614 )))
615
616 (((
617 (((
618 These commands only valid for LTC2, as below:(% title="Click and drag to resize" %)​
619 )))
620 )))
621
622 (% 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" %)​
623
624
625 == 3.1  Set Transmit Interval Time ==
626
627
628 Feature: Change LoRaWAN End Node Transmit Interval.
629
630 (% style="color:#037691" %)**AT Command: AT+TDC**
631
632 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:501px" %)
633 |(% style="background-color:#4f81bd; color:white; width:155px" %)**Command Example**|(% style="background-color:#4f81bd; color:white; width:166px" %)**Function**|(% style="background-color:#4f81bd; color:white; width:180px" %)**Response**
634 |(% style="width:155px" %)AT+TDC=?|(% style="width:162px" %)Show current transmit Interval|(% style="width:177px" %)(((
635 30000
636 OK
637 the interval is 30000ms = 30s
638 )))
639 |(% style="width:155px" %)AT+TDC=60000|(% style="width:162px" %)Set Transmit Interval|(% style="width:177px" %)(((
640 OK
641 Set transmit interval to 60000ms = 60 seconds
642 )))
643
644 (((
645 (% style="color:#037691" %)**Downlink Command: 0x01**
646 )))
647
648 (((
649 (((
650 Format: Command Code (0x01) followed by 3 bytes time value.
651
652 (((
653 If the downlink payload=0100003C, it means set the END Node's Transmit Interval to 0x00003C=60(S), while type code is 01.
654 )))
655
656 * Example 1: Downlink Payload: 0100001E  ~/~/  Set Transmit Interval (TDC) = 30 seconds
657 * Example 2: Downlink Payload: 0100003C  ~/~/  Set Transmit Interval (TDC) = 60 seconds
658 )))
659 )))
660
661
662
663 == 3.2  Enable PT100 channels ==
664
665
666 Feature: Enable PT100 channels. Default only Enable Channel 1
667
668 (% style="color:#037691" %)**AT Command: AT+ENPTCHNUM**
669
670 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:494px" %)
671 |=(% style="width: 164px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 254px;background-color:#4F81BD;color:white" %)**Function**|=(% style="width: 76px;background-color:#4F81BD;color:white" %)**Response**
672 |(% style="width:164px" %)AT+ENPTCHNUM=?|(% style="width:254px" %)Get current ENPTCHNUM settings|(% colspan="1" rowspan="3" style="width:74px" %)(((
673 1
674
675 OK
676 )))
677 |(% style="width:164px" %)AT+ ENPTCHNUM =1|(% colspan="1" style="width:254px" %)Enable channel 1
678 |(% style="width:164px" %)AT+ ENPTCHNUM =2|(% colspan="1" style="width:254px" %)Enable channel 1 and 2
679
680 (% style="color:#037691" %)**Downlink Command: 0xA1**
681
682 Total bytes: 2 bytes
683
684 Example:
685
686 * 0xA101: same as AT+ENPTCHNUM =1
687 * 0xA102: same as AT+ENPTCHNUM =2
688
689 == 3.3  Set External Sensor Mode ==
690
691
692 (((
693 Feature: Change External Sensor Mode.
694 )))
695
696 (((
697 (% style="color:#037691" %)**Downlink Command: AT+EXT**
698 )))
699
700 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:431px" %)
701 |=(% style="width: 158px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 184px;background-color:#4F81BD;color:white" %)**Function**|=(% style="width: 89px;background-color:#4F81BD;color:white" %)**Response**
702 |(% style="width:155px" %)AT+EXT=?|(% style="width:180px" %)Get current EXT settings|(% colspan="1" rowspan="4" style="width:86px" %)(((
703 1
704 OK
705 )))
706 |(% style="width:155px" %)AT+EXT=1|(% colspan="1" style="width:180px" %)Set EXT to 0b(0001)
707 |(% style="width:155px" %)AT+EXT=2|(% colspan="1" style="width:180px" %)Set EXT to 0b(0010)
708 |(% style="width:155px" %)AT+EXT=3|(% colspan="1" style="width:180px" %)Set EXT to 0b(0011)
709
710 (% style="color:#037691" %)**Downlink Command: 0xA2**
711
712 Total bytes: 2 bytes
713
714 Example:
715
716 * 0xA201: same as AT+EXT=1
717
718 == 3.4 Quit AT Command ==
719
720
721 Feature: Quit AT Command mode, so user need to input password again before use AT Commands.
722
723 (% style="color:#037691" %)**AT Command: AT+DISAT**
724
725 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:446px" %)
726 |=(% style="width: 163px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 195px;background-color:#4F81BD;color:white" %)**Function**|=(% style="width: 88px;background-color:#4F81BD;color:white" %)**Response**
727 |(% style="width:161px" %)AT+DISAT|(% style="width:193px" %)Quit AT Commands mode|(% style="width:87px" %)OK
728
729 (% style="color:#037691" %)**Downlink Command:**
730
731 No downlink command for this feature.
732
733
734 == 3.5 Set system time ==
735
736
737 Feature: Set system time, unix format. [[See here for formmat detail.>>||anchor="H2.5.1A0UnixTimeStamp"]]
738
739 (% style="color:#037691" %)**AT Command:**
740
741 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:506px" %)
742 |=(% style="width: 219px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 287px;background-color:#4F81BD;color:white" %)**Function**
743 |(% style="width:218px" %)AT+TIMESTAMP=1611104352|(% style="width:285px" %)(((
744 OK
745 Set System time to 2021-01-20 00:59:12
746 )))
747
748 (% style="color:#037691" %)**Downlink Command:**
749
750 0x306007806000  ~/~/ Set timestamp to 0x(6007806000),Same as AT+TIMESTAMP=1611104352
751
752
753 == 3.6 Set Time Sync Mode ==
754
755
756 Feature: Enable/Disable Sync system time via LoRaWAN MAC Command (DeviceTimeReq), LoRaWAN server must support v1.0.3 protocol to reply this command.
757
758 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.
759
760
761 (% style="color:#037691" %)**AT Command:**
762
763 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:473px" %)
764 |=(% style="width: 159px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 314px;background-color:#4F81BD;color:white" %)**Function**
765 |(% style="width:157px" %)AT+SYNCMOD=1|(% style="width:313px" %)Enable Sync system time via LoRaWAN MAC Command (DeviceTimeReq)
766
767 (% style="color:#037691" %)**Downlink Command:**
768
769 0x28 01  ~/~/ Same As AT+SYNCMOD=1
770
771 0x28 00  ~/~/ Same As AT+SYNCMOD=0
772
773
774 == 3.7 Set Time Sync Interval ==
775
776
777 Feature: Define System time sync interval. SYNCTDC default value: 10 days.
778
779 (% style="color:#037691" %)**AT Command:**
780
781 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:469px" %)
782 |=(% style="width: 163px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 306px;background-color:#4F81BD;color:white" %)**Function**
783 |AT+SYNCTDC=0x0A|(% style="width:306px" %)Set SYNCTDC to 10 (0x0A), so the sync time is 10 days.
784
785 (% style="color:#037691" %)**Downlink Command:**
786
787 0x29 0A  ~/~/ Same as AT+SYNCTDC=0x0A
788
789
790 == 3.8 Retrieve data ==
791
792
793 Feature: Retrieval data for specify time slot.
794
795 (% style="color:#037691" %)**AT Command**(%%)**:**
796
797 No AT Command, only valid for downlink command.
798
799
800 (% style="color:#037691" %)**Downlink Command:**
801
802 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
803
804
805 == 3.9 Enable Alarm mode ==
806
807
808 Feature: Enable Alarm Mode.
809
810 (% style="color:#037691" %)**AT Command: AT_WMOD**
811
812 Total bytes: 2
813
814 Example:
815
816 0xA500: AT+WMOD=0(default)
817
818 0xA501: AT+WMOD=1(alarm mode)
819
820
821 (% style="color:#037691" %)**Downlink Command:**
822
823 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
824
825
826 == 3.10 Alarm check time ==
827
828
829 Feature: The time interval to check sensor value for Alarm.
830
831 (% style="color:#037691" %)**AT Command: AT+CITEMP**
832
833 Total bytes: 3
834
835 Example:
836
837 0xA60001: AT+CITEMP=1(default)
838
839 Set collection interval in 1min,only in alarm mode
840
841
842 (% style="color:#037691" %)**Downlink Command:**
843
844 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
845
846
847 == 3.11 Set Alarm Threshold ==
848
849
850 Feature: Set Alarm Threshold.
851
852 (% style="color:#037691" %)**AT Command: AT+ARTEMP**
853
854 Total bytes: 9  Unit: ℃
855
856 Example:
857
858 A7FF380320FF380320
859
860 AT+ARTEMP=-200,800,-200,800
861
862
863 A7000A0064000A0065
864
865 AT+ARTEMP=10,100,10,101
866
867 Channel 1 operating temp:10~~100
868
869 Channel 2 operating temp:10~~101
870
871
872 (% style="color:#037691" %)**Downlink Command:**
873
874 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
875
876
877 == 3.12 Set Calibrate Value ==
878
879
880 Feature: Set Calibrate value for PT100 cable.  Detail of use of this command please see [[connect to a customized PT100 Probe>>||anchor="H6.2A0HowtoconnectacustomizedPT100cable3F"]].
881
882 (% style="color:#037691" %)**AT Command: AT+RCABLE**
883
884 Total bytes: 5
885
886 Example:
887
888 AT+RCABLE=296,300
889
890 Channel 1 rcable=0x0128/1000=0.296R
891
892 Channel 2 rcable=0x012C/1000=0.300R
893
894
895 (% style="color:#037691" %)**Downlink Command:**
896
897 0xA80128012C  ~-~->  Same as AT+RCABLE=296,300
898
899
900 == 3.13 Poll Calibrate Value ==
901
902
903 Feature: Poll Calibrate value. LTC2 will reply with this command send an uplink to server.
904
905 (% style="color:#037691" %)**AT Command: No AT Command.**
906
907
908 (% style="color:#037691" %)**Downlink Command:**
909
910 Example: A901
911
912 End nodes will send racable config to server
913
914 Like uplink payload: 010128012C
915
916
917 == 3.14 Print data entries base on page ==
918
919
920 Feature: Print the sector data from start page to stop page (max is 400 pages).
921
922 (% style="color:#037691" %)**AT Command: AT+PDTA**
923
924 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
925 |(% style="background-color:#4f81bd; color:white; width:157px" %)**Command Example**|(% style="background-color:#4f81bd; color:white; width:353px" %)**Response**
926 |(% style="width:156px" %)(((
927
928
929 AT+PDTA=259,260
930
931 Print page 259 to 260
932
933
934 )))|(% style="width:362px" %)(((
935 Stop Tx events when read sensor data
936
937 8021600 systime= 2021/5/16 00:17:44 1 3684 Temp1=28.71 Temp2=-327.67
938
939 8021610 systime= 2021/5/16 00:37:44 1 3685 Temp1=28.78 Temp2=-327.67
940
941 8021620 systime= 2021/5/16 00:57:44 1 3684 Temp1=28.83 Temp2=-327.67
942
943 8021630 systime= 2021/5/16 01:17:44 1 3684 Temp1=28.89 Temp2=-327.67
944
945 8021640 systime= 2021/5/16 01:37:44 1 3681 Temp1=28.79 Temp2=-327.67
946
947 8021650 systime= 2021/5/16 01:57:44 1 3681 Temp1=28.67 Temp2=-327.67
948
949 8021660 systime= 2021/5/16 02:17:44 1 3684 Temp1=28.60 Temp2=-327.67
950
951 8021670 systime= 2021/5/16 02:37:44 1 3684 Temp1=28.56 Temp2=-327.67
952
953 8021680 systime= 2021/5/16 02:57:44 1 3684 Temp1=28.52 Temp2=-327.67
954
955 8021690 systime= 2021/5/16 03:17:44 1 3684 Temp1=28.51 Temp2=-327.67
956
957 80216A0 systime= 2021/5/16 03:37:44 1 3684 Temp1=28.50 Temp2=-327.67
958
959 80216B0 systime= 2021/5/16 03:57:44 1 3684 Temp1=28.46 Temp2=-327.67
960
961 80216C0 systime= 2021/5/16 04:17:44 1 3684 Temp1=28.40 Temp2=-327.67
962
963 80216D0 systime= 2021/5/16 04:37:44 1 3683 Temp1=28.37 Temp2=-327.67
964
965 80216E0 systime= 2021/5/16 04:57:44 1 3684 Temp1=28.36 Temp2=-327.67
966
967 80216F0 systime= 2021/5/16 05:17:44 1 3685 Temp1=28.32 Temp2=-327.67
968
969 Start Tx events
970
971 OK
972 )))
973
974 (% style="color:#037691" %)**Downlink Command:**
975
976 No downlink commands for feature
977
978
979 == 3.15 Print last few data entries ==
980
981
982 Feature: Print the last few data entries
983
984 (% style="color:#037691" %)**AT Command: AT+PLDTA**
985
986 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
987 |(% style="background-color:#4f81bd; color:white; width:156px" %)**Command Example**|(% style="background-color:#4f81bd; color:white; width:354px" %)**Response**
988 |(((
989 AT+PLDTA=5
990
991 Print last 5 entries
992 )))|(% style="width:278px" %)(((
993 Stop Tx events when read sensor data
994
995 1 systime= 2021/5/17 03:12:37 1 3681 Temp1=26.01 Temp2=-327.67
996
997 2 systime= 2021/5/17 03:17:37 1 3682 Temp1=26.02 Temp2=-327.67
998
999 3 systime= 2021/5/17 03:22:37 1 3687 Temp1=25.94 Temp2=-327.67
1000
1001 4 systime= 2021/5/17 03:27:37 1 3684 Temp1=25.95 Temp2=-327.67
1002
1003 5 systime= 2021/5/17 03:32:37 1 3684 Temp1=26.20 Temp2=-327.67
1004
1005 Start Tx events
1006
1007 OK
1008 )))
1009
1010 (% style="color:#037691" %)**Downlink Command:**
1011
1012 No downlink commands for feature
1013
1014
1015 == 3.16 Clear Flash Record ==
1016
1017
1018 Feature: Clear flash storage for data log feature.
1019
1020 (% style="color:#037691" %)**AT Command: AT+CLRDTA**
1021
1022 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
1023 |=(% style="width: 157px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 137px;background-color:#4F81BD;color:white" %)**Function**|=(% style="width: 216px;background-color:#4F81BD;color:white" %)**Response**
1024 |(% style="width:157px" %)AT+CLRDTA|(% style="width:136px" %)Clear date record|(% style="width:213px" %)(((
1025 Clear all stored sensor data…
1026 OK
1027 )))
1028
1029 (% style="color:#037691" %)**Downlink Command: 0xA3**
1030
1031 * Example: 0xA301  ~/~/  Same as AT+CLRDTA
1032
1033 = 4.  Battery & Power Consumption =
1034
1035
1036 LTC2 uses ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.
1037
1038 [[**Battery Info & Power Consumption Analyze**>>url:http://wiki.dragino.com/xwiki/bin/view/Main/How%20to%20calculate%20the%20battery%20life%20of%20Dragino%20sensors%3F/]] .
1039
1040
1041 = 5.  Firmware Change Log and Upload Firmware =
1042
1043
1044 (((
1045 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:
1046 )))
1047
1048 (((
1049
1050 )))
1051
1052 (((
1053 **Connection:**
1054 )))
1055
1056 * (((
1057 (% style="background-color:yellow" %)**ST-LINK v2 GND  <~-~->  LTC2 GND**
1058 )))
1059 * (((
1060 (% style="background-color:yellow" %)**ST-LINK v2 RESET  <~-~->  LTC2 NRST**
1061 )))
1062 * (((
1063 (% style="background-color:yellow" %)**ST-LINK v2 SWCLK  <~-~->  LTC2 SWCLK**
1064 )))
1065 * (((
1066 (% style="background-color:yellow" %)**ST-LINK v2 SWDIO  <~-~->  LTC2 SWDIO**
1067 )))
1068 * (((
1069 (% style="background-color:yellow" %)**LTC2 power must be on.  **
1070 )))
1071
1072 (((
1073
1074
1075 **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]]
1076
1077 **Firmware Upgrade Method:**[[https:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Firmware%20Upgrade%20Instruction%20for%20STM32%20base%20products/#H4.2.FirmwareupgradeusingSTM32Cubeprogramer>>https://wiki.dragino.com/xwiki/bin/view/Main/Firmware%20Upgrade%20Instruction%20for%20STM32%20base%20products/#H4.2.FirmwareupgradeusingSTM32Cubeprogramer||style="background-color: rgb(255, 255, 255);"]]
1078 )))
1079
1080 = 6.  FAQ =
1081
1082 == 6.1  How to use AT Command to configure LTC2 ==
1083
1084
1085 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.
1086
1087
1088 **Connection:**
1089
1090 * (% style="background-color:yellow" %)**USB to TTL GND <~-~->  LTC2 GND**
1091
1092 * (% style="background-color:yellow" %)**USB to TTL RXD  <~-~->  LTC2 TXD**
1093
1094 * (% style="background-color:yellow" %)**USB to TTL TXD  <~-~->  LTC2 RXD**
1095
1096 (((
1097 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.
1098 )))
1099
1100
1101 (((
1102 Input password and ATZ to activate LTC2,As shown below:
1103 )))
1104
1105 [[image:image-20220620151601-13.png||height="393" width="1042"]]
1106
1107
1108 == 6.2  How to connect a customized PT100 cable? ==
1109
1110
1111 (((
1112 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. 
1113 )))
1114
1115
1116 (((
1117 (% 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.
1118 )))
1119
1120 [[image:image-20220620152115-14.jpeg||height="548" width="763"]]
1121
1122 We know that the Multimeter has a shortcut resistance 0.002 ohm.
1123
1124
1125 (% style="color:blue" %)**Step 2**(%%): Measure the resistance between the two shorted wires of PT100 Probe.
1126
1127
1128 [[image:image-20220620152115-15.jpeg||height="791" width="704"]]
1129
1130 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) .
1131
1132
1133 (% style="color:blue" %)**Step 3**(%%): Run Calibrate Command.
1134
1135 Run this command to both channels to use 0.296R calibrate resistance.
1136
1137 (% style="color:red" %)**AT+RCABLE=296,0** (%%) ~-~->  Calibrate Channel 1 with 0.296R
1138
1139
1140 Or use LoRaWAN downlink command (0xA8 Code) to set: 0xA801280000
1141
1142 User can use 0xA9 downlink command to poll the current calibration value.
1143
1144
1145 (% style="color:blue" %)**Step 4**(%%)**: **Connect the PT100 to LTC2
1146
1147 [[image:image-20220620152115-16.png]]
1148
1149
1150 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.
1151
1152
1153 == 6.3  What is the frequency range of LTC2 LoRa part? ==
1154
1155
1156 Different LTC2 version supports different frequency range, below is the table for the working frequency and recommend bands for each model:
1157
1158 [[image:image-20230427172553-5.jpeg||height="146" width="639"]]
1159
1160
1161 == 6.4  How to change the LoRa Frequency Bands/Region ==
1162
1163
1164 You can follow the instructions for [[how to upgrade image>>||anchor="H5.A0FirmwareChangeLogandUploadFirmware"]].
1165 When downloading the images, choose the required image file for download. ​
1166
1167 (% style="display:none" %) (%%)
1168
1169
1170 == 6.5 How can I read sensor data without LoRaWAN? For Calibration Purpose ==
1171
1172 Some clients need to calibrate the sensor value in calibration Lab. In such case, Reading the data without LoRaWAN network is more convenient. To achieve this, use can use a USB-TTL Adapter  to connect the LTC2 Motherboard's UART pins while still have the probe connected. See below.
1173
1174 [[image:image-20240417153156-3.jpeg||height="636" width="930"]]
1175
1176
1177 After there is UART Connection, reset the node.
1178
1179 Example output:
1180
1181 [[image:image-20240312141207-3.png||height="527" width="930"]]
1182
1183
1184 == 6.6 LTC2 supported with 3-wire PT100 ==
1185
1186 The LTC2 uses the bridge method to measure temperature and supports the use of 3-wire PT100.
1187
1188 The difference between the wiring mode of three-wire PT100 and four-wire PT100 and the difference in the detection principle：
1189
1190 * Three wire PT100 adopts bridge method to measure data, and the relationship between the output temperature value and the output value of analog quantity.
1191 * The four-wire PT100 has no bridge, is sent by constant current source, voltmeter measurement, and finally gives the measured resistance value.
1192
1193 [[image:image-20240417145507-1.jpeg||height="234" width="522"]]
1194
1195 [[image:image-20240417145520-2.jpeg||height="182" width="523"]]
1196
1197
1198 **Note:** **2-wire PT100, current loop and voltage measurement loop combined in one, poor accuracy, not discussed.**
1199
1200
1201
1202 = 7.  Trouble Shooting =
1203
1204 == 7.1  AT Command input doesn't work ==
1205
1206
1207 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.
1208
1209
1210 = 8.  Order Info =
1211
1212
1213 Part Number **:** (% style="color:blue" %)**LTC2-XXX-YYY**
1214
1215 (% style="color:#0000ff" %)**XXX**(%%)**: **Probe Version
1216
1217 * (% style="color:red" %)**SI**(%%):  Standard IP68 probe x 1
1218 * (% style="color:red" %)**LT**(%%):  Low Temperature probe x 1
1219 * (% style="color:red" %)**HT**(%%): High Temperature probe x 1
1220 * (% style="color:red" %)**FSA**(%%):  Food Safety probe x 1
1221 * (% style="color:red" %)**FT**(%%):  Flat Type probe x 1
1222 * (% style="color:red" %)**NA**(%%): No probe
1223
1224 (% style="color:#0000ff" %)**YYY**(%%)**: **The default frequency band
1225
1226 * (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band
1227 * (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band
1228 * (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band
1229 * (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band
1230 * (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band
1231 * (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band
1232 * (% style="color:red" %)**IN865 **(%%)**:**  LoRaWAN IN865 band
1233 * (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band
1234
1235 = 9. ​ Packing Info =
1236
1237
1238 **Package Includes**:
1239
1240 * LTC2 LoRaWAN Temperature Transmitter x 1
1241
1242 **Dimension and weight**:
1243
1244 * Device Size: cm
1245 * Device Weight: g
1246 * Package Size / pcs : cm
1247 * Weight / pcs : g
1248
1249 = 10.  ​Support =
1250
1251
1252 * 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.
1253 * 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]].
1254
1255

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