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Version 312.2 by Xiaoling on 2024/10/22 10:33
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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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14 (% aria-label="macro:toc widget" contenteditable="false" role="region" tabindex="-1" %)
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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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18
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23
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="314" width="756"]]
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 == 1.4 Hardware Change log ==
91
92
93 LTC2 v1.0: Release.
94
95
96 == 1.5  Pin Definitions and Switch ==
97
98 === (% title="Click and drag to resize" %)1.5.1  J(%%)umper JP2 ( Power ON) ===
99
100 (% class="wikigeneratedid" id="H200B200B200B200B" %)
101 (% 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" %)​(%%)​
102
103 Put a jumper on JP2 will power on the LTC2.
104
105
106 === 1.5.2  LED ===
107
108
109 The LED will flash in below case.
110
111 (((
112 1.  Send an uplink packet
113
114
115 )))
116
117 === 1.5.3  PT100 Interfaces ===
118
119
120 (((
121 There are two independent channels to connect 2 x PT100 probes.
122 )))
123
124 (((
125 Each channel has 3-wire connection for 3-wire PT100 probes.
126 )))
127
128
129 === 1.5.4  Reset Button ===
130
131
132 Press this button will reboot the LTC2
133
134
135 == 1.6  Probe Variant ==
136
137
138 LTC2 provide default probe version. See below for the variant:
139
140
141 (% border="1" cellspacing="4" style="width:505px" %)
142 |=(% style="width: 78px;background-color:#4F81BD;color:white" %)(((
143 **Model**
144 )))|=(% style="width: 127px;background-color:#4F81BD;color:white" %)(((
145 **Photo**
146 )))|=(% style="width: 300px;background-color:#4F81BD;color:white" %)(((
147 **Description**
148 )))
149 |(% style="width:78px" %)(((
150 LTC2-SI
151 )))|(% style="width:117px" %)(((
152 (% style="text-align:center" %)
153 [[image:1655458404877-785.png]]
154 )))|(% style="width:314px" %)(((
155 Standard IP68 Probe Version
156
157 * (((
158 LTC2 with 1 x Standard IP68 PT100 probe.
159 )))
160 * (((
161 Installation: Insert
162 )))
163 * (((
164 Cable Length : 2m
165 )))
166 * (((
167 PT100 Class : Class A
168 )))
169 * (((
170 Probe Dimension: 4*30mm
171 )))
172 * (((
173 Measure Range: -50 ~~ 200 °C
174 )))
175 * (((
176 Suitable Environment: General environment
177 )))
178 )))
179 |(% style="width:78px" %)(((
180 LTC2-LT
181 )))|(% style="width:117px" %)(((
182 (% style="text-align:center" %)
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 (% style="text-align:center" %)
213 [[image:image-20220617172838-3.png]]
214 )))|(% style="width:314px" %)(((
215 Food Safety Version
216
217 * (((
218 LTC2 with 1 x Food Safety PT100 probe.
219 )))
220 * (((
221 Installation: Insert
222 )))
223 * (((
224 Cable Length : 2m
225 )))
226 * (((
227 PT100 Class : Class A
228 )))
229 * (((
230 Probe Dimension: 4*150mm
231 )))
232 * (((
233 Measure Range: -50 ~~ 200 °C
234 )))
235 * (((
236 Suitable Environment: Food temperature measurement
237 )))
238 )))
239 |(% style="width:78px" %)LTC-FSA|(% style="width:117px" %)(((
240 (% style="text-align:center" %)
241 [[image:image-20221222182717-1.jpeg]]
242 )))|(% style="width:314px" %)(((
243 Food Safety Version
244
245 * (((
246 LTC2 with 1 x Food Safety PT100 probe.
247 )))
248 * (((
249 Installation: Insert
250 )))
251 * (((
252 Cable Length : 2m
253 )))
254 * (((
255 PT100 Class : Class A
256 )))
257 * (((
258 Probe Dimension: 4*150mm
259 )))
260 * (((
261 Measure Range: -50 ~~ 200 °C
262 )))
263 * (((
264 Suitable Environment: Food temperature measurement
265 )))
266 )))
267 |(% style="width:78px" %)(((
268 LTC2-FT
269 )))|(% style="width:117px" %)(((
270 (% style="text-align:center" %)
271 [[image:image-20220617172838-4.png]]
272 )))|(% style="width:314px" %)(((
273 Flat Type Version
274
275 * LTC2 with 1 x Flat Type PT100 probe.
276 * Installation: Attached
277 * Cable Length : 2m
278 * PT100 Class : Class A
279 * Probe Dimension: 8*25mm
280 * Measure Range: -50 ~~ 200 °C
281 * Suitable Environment: Attached to the measure point.
282 )))
283 |(% style="width:78px" %)LTC2-HT|(% style="width:117px" %)(((
284 (% style="text-align:center" %)
285 [[image:image-20220617172838-5.png]]
286 )))|(% style="width:314px" %)(((
287 High Temperature Version
288
289 * LTC2 with 1 x high temperature PT100 probe.
290 * Installation: Insert
291 * Cable Length : 3m
292 * PT100 Class : Class A
293 * Probe Dimension: 4*30mm
294 * Measure Range: -70 ~~ 550 °C
295
296 Suitable Environment: High Temperature
297 )))
298 |(% style="width:78px" %)LTC2-NA|(% style="width:117px" %)(((
299 (% style="text-align:center" %)
300 [[image:image-20220617172838-6.png]]
301 )))|(% style="width:314px" %)(((
302 No Probe version:
303
304 * User can connect to their own PT100 Probe
305 * Grand Hole: M12
306 * Suitable Environment:
307
308 Connect to customized probe
309 )))
310
311 = 2.  How to use LTC2? =
312
313 == 2.1  Connect to PT100 sensors ==
314
315
316 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"]](%%).
317
318
319 == 2.2  How it works? ==
320
321
322 (((
323 (((
324 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**.
325 )))
326
327 (((
328 On each uplink, LTC2 will check its two ADC Interfaces and get the temperature from the sensor and send out to server.
329 )))
330 )))
331
332
333 == 2.3  ​Quick guide to connect to LoRaWAN server (OTAA) ==
334
335
336 (((
337 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.
338
339 (% 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"]]
340 )))
341
342 (% 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" %)​(%%)​
343
344 (((
345
346
347 === 2.3.1 Step 1: Create a device in TTN with the OTAA keys from LTC2 ===
348
349
350
351 Below is TTN screen shot:
352
353 * Create Application first.
354 * Manually Add a LoRaWAN End Device device. Choose **OTAA** and **MAC v1.0.3**
355
356 [[image:1655690861020-685.png]]
357
358
359 [[image:1655690877643-259.png]]
360
361
362 Input the OTAA keys for LTC2.
363
364 Each LTC2 is shipped with a sticker with the default device EUI as below:
365
366 [[image:image-20230426083905-2.png||height="272" width="586"]]
367
368
369 * **Input these keys to device portal.**
370
371 [[image:image-20220620100853-1.png]]
372
373
374
375 * **Choose the Frequency band for this end node.**
376
377 [[image:image-20220620100853-2.png]]
378
379
380 * **Input APP Key in this page as well. **
381
382 [[image:image-20220620100853-3.png]]
383
384
385 Add payload formatter So TTNv3 knows how to parse the LTC2 upload value.
386
387 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]]
388
389
390 [[image:image-20220620100853-4.png||height="496" width="1097"]]
391
392
393 === 2.3.2  Step 2: Power on LTC2 ===
394
395
396 LTC2 is power off when ship from factory.
397
398 Put a Jumper on JP2 to power on the device.
399
400
401 [[image:1655691076464-442.png]]
402
403
404 (((
405 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.
406 )))
407
408 (((
409 Below is an example uplink message which shows the LTC2 is sending Join Request to TTNv3.
410 )))
411
412
413 [[image:1655691086647-147.png]]
414
415
416 After join successful, LTC2 will send uplink message with the sensor value.
417
418 [[image:1655691100066-163.png]]
419
420 Above value shows Channel1 detect 25.94 degree. There is no PT100 connected on Channel 2, so it shows -327.67.
421 )))
422
423
424 == 2.4  ​Uplink Payload ==
425
426
427 Below is the uplink payload which shows.
428
429 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:390px" %)
430 |=(% style="width: 70px;background-color:#4F81BD;color:white" %)(((
431 **Size(bytes)**
432 )))|=(% 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**
433 |(% style="width:62.5px" %)Value|(((
434 [[BAT>>||anchor="HBAT"]]
435 )))|(((
436 [[Status & EXT>>||anchor="HStatus26EXT"]]
437 )))|(((
438 [[Channel 1 data>>||anchor="HChannel1dataandChannel2data"]]
439 )))|(((
440 [[Channel 2 data>>||anchor="HChannel1dataandChannel2data"]]
441 )))|(((
442 [[Unix TimeStamp>>||anchor="HUnixTimeStamp"]]
443 )))
444
445 (% 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"]]
446
447
448 (((
449 === (% style="color:blue" %)**BAT**(%%) ===
450
451
452 Ex1: 0x0E3C ⇒ 3644 (mV) = 3.644 V
453
454 (% class="wikigeneratedid" %)
455
456 )))
457
458 (((
459 === (% style="color:blue" %)**Status & EXT**(%%) ===
460 )))
461
462 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:500px" %)
463 |(% 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]**
464 |(% 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)
465
466 * (% style="color:#037691" %)**Poll Message Flag**(%%):  1: This message is a poll message reply, 0: means this is a normal uplink.
467 * (% 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.
468 * (% 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)
469 * (% style="color:#037691" %)**EXT**(%%):  The decode method for Channel 1 data and Channel 2 data
470 ** 0b(0001): Upload PT100 temperature, with 2 decimals, range:  **-327.67 ~~ 327.67 ℃**
471 ** 0b(0010): Upload PT100 temperature, with 1 decimals, range: ** -3276.7 ~~ 3276.7 ℃**
472 ** 0b(0011): Upload Resistance instead of Temperature, range:  **-327.67~~ 327.67 ohm**
473
474 (((
475 (% class="wikigeneratedid" %)
476
477
478
479 === (% style="color:blue" %)**Channel 1 data and Channel 2 data**(%%) ===
480
481 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:515px" %)
482 |(% 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)**
483 |(% 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
484 |(% 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
485 )))
486
487 (((
488 (% class="wikigeneratedid" %)
489
490
491 === (% style="color:blue" %)**Unix TimeStamp**(%%) ===
492 )))
493
494 Refer to Datalog feature.
495
496 (% style="color:#037691" %)**Example Uplink Payload**:
497
498
499 **Uplink payload example 1:**  0CE9011422EC2D6073E83B
500
501 * Bat voltage:0x0CE9 =3305mV
502 * Ext=0x01
503 * Channel1 temp=0x1422/100=51.54 ℃
504 * Channel2 temp=(0xEC2D-65536)/100=-50.75 ℃
505 * System timestamp=0x6073E83B= 1618208827(UTC)
506
507 If payload is: EC2DH : (EC2D & 8000 == 1), temp = (EC2DH - 65536)/100 = -50.75 ℃
508
509 (EC2D & 8000: Judge whether the highest bit is 1, when the highest bit is 1, it is negative)
510
511
512 **Uplink payload example 2: ** 0CED020203FE056073E697
513
514 * Bat voltage:0x0CED =3309mV
515 * Ext=0x02
516 * Channel1 temp=0x0203/10=515.4 ℃
517 * Channel2 temp=(0xFE05-65536)/10=-507.5 ℃
518 * System timestamp=0x6073E697=1618208407(UTC)
519
520 If payload is: FE05H :  (FE05 & 8000 == 1) , temp = (FE05H - 65536)/100 = 507.5 ℃
521
522 (EC2D & 8000: Judge whether the highest bit is 1, when the highest bit is 1, it is negative)
523
524
525 **Uplink payload example 3 :**  0CE9032EDE1F406073E967
526
527 * Bat voltage:0x0CE9 =3305mV
528 * Ext=0x03
529 * Channel1 res=0x2EDE/100=119.98 ohm
530 * Channel2 res=0x1F40/100=80.00 ohm
531 * System timestamp=0x6073E967= 1618209127(UTC)
532
533 (% 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" %)​(%%)​
534
535
536 == 2.5  ​Alarm Mode ==
537
538
539 (((
540 LTC2 can monito the temperature in every CTTEMP time, when the temperature exceed the limit , it will uplink the sensor value immediately.
541
542 Detail commands see:
543
544 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Enable Alarm Mode**>>||anchor="H3.9EnableAlarmmode"]]
545 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Config Alarm Sampling Time**>>||anchor="H3.10Alarmchecktime"]]
546 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Set Alarm Threshold**>>||anchor="H3.11SetAlarmThreshold"]]
547
548
549 )))
550
551
552 = 3.  Configure LTC2 via AT Command or LoRaWAN Downlink =
553
554
555 (((
556 (((
557 Use can configure LTC2 via AT Command or LoRaWAN Downlink.
558 )))
559 )))
560
561 * (((
562 (((
563 AT Command Connection: See [[FAQ>>||anchor="H6.A0FAQ"]].
564 )))
565 )))
566 * (((
567 (((
568 LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]]
569 )))
570 )))
571
572 (((
573 (((
574
575 )))
576
577 (((
578 There are two kinds of commands to configure LTC2, they are:
579 )))
580 )))
581
582 * (((
583 (((
584 (% style="color:#4f81bd" %)** General Commands**.
585 )))
586 )))
587
588 (((
589 (((
590 These commands are to configure:
591 )))
592 )))
593
594 * (((
595 (((
596 General system settings like: uplink interval.
597 )))
598 )))
599 * (((
600 (((
601 LoRaWAN protocol & radio related command.
602 )))
603 )))
604
605 (((
606 (((
607 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]]
608 )))
609 )))
610
611 (((
612 (((
613
614 )))
615 )))
616
617 * (((
618 (((
619 (% style="color:#4f81bd" %)** Commands special design for LTC2**
620 )))
621 )))
622
623 (((
624 (((
625 These commands only valid for LTC2, as below:(% title="Click and drag to resize" %)​
626 )))
627 )))
628
629 (% 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" %)​
630
631
632 == 3.1  Set Transmit Interval Time ==
633
634
635 Feature: Change LoRaWAN End Node Transmit Interval.
636
637 (% style="color:#037691" %)**AT Command: AT+TDC**
638
639 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:501px" %)
640 |(% 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**
641 |(% style="width:155px" %)AT+TDC=?|(% style="width:162px" %)Show current transmit Interval|(% style="width:177px" %)(((
642 30000
643 OK
644 the interval is 30000ms = 30s
645 )))
646 |(% style="width:155px" %)AT+TDC=60000|(% style="width:162px" %)Set Transmit Interval|(% style="width:177px" %)(((
647 OK
648 Set transmit interval to 60000ms = 60 seconds
649 )))
650
651 (((
652 (% style="color:#037691" %)**Downlink Command: 0x01**
653 )))
654
655 (((
656 (((
657 Format: Command Code (0x01) followed by 3 bytes time value.
658
659 (((
660 If the downlink payload=0100003C, it means set the END Node's Transmit Interval to 0x00003C=60(S), while type code is 01.
661 )))
662
663 * Example 1: Downlink Payload: 0100001E  ~/~/  Set Transmit Interval (TDC) = 30 seconds
664 * Example 2: Downlink Payload: 0100003C  ~/~/  Set Transmit Interval (TDC) = 60 seconds
665 )))
666 )))
667
668
669
670 == 3.2  Enable PT100 channels ==
671
672
673 Feature: Enable PT100 channels. Default only Enable Channel 1
674
675 (% style="color:#037691" %)**AT Command: AT+ENPTCHNUM**
676
677 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:494px" %)
678 |=(% 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**
679 |(% style="width:164px" %)AT+ENPTCHNUM=?|(% style="width:254px" %)Get current ENPTCHNUM settings|(% colspan="1" rowspan="3" style="width:74px" %)(((
680 1
681
682 OK
683 )))
684 |(% style="width:164px" %)AT+ ENPTCHNUM =1|(% colspan="1" style="width:254px" %)Enable channel 1
685 |(% style="width:164px" %)AT+ ENPTCHNUM =2|(% colspan="1" style="width:254px" %)Enable channel 1 and 2
686
687 (% style="color:#037691" %)**Downlink Command: 0xA1**
688
689 Total bytes: 2 bytes
690
691 Example:
692
693 * 0xA101: same as AT+ENPTCHNUM =1
694 * 0xA102: same as AT+ENPTCHNUM =2
695
696 == 3.3  Set External Sensor Mode ==
697
698
699 (((
700 Feature: Change External Sensor Mode.
701 )))
702
703 (((
704 (% style="color:#037691" %)**Downlink Command: AT+EXT**
705 )))
706
707 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:431px" %)
708 |=(% 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**
709 |(% style="width:155px" %)AT+EXT=?|(% style="width:180px" %)Get current EXT settings|(% colspan="1" rowspan="4" style="width:86px" %)(((
710 1
711 OK
712 )))
713 |(% style="width:155px" %)AT+EXT=1|(% colspan="1" style="width:180px" %)Set EXT to 0b(0001)
714 |(% style="width:155px" %)AT+EXT=2|(% colspan="1" style="width:180px" %)Set EXT to 0b(0010)
715 |(% style="width:155px" %)AT+EXT=3|(% colspan="1" style="width:180px" %)Set EXT to 0b(0011)
716
717 (% style="color:#037691" %)**Downlink Command: 0xA2**
718
719 Total bytes: 2 bytes
720
721 Example:
722
723 * 0xA201: same as AT+EXT=1
724
725 == 3.4 Quit AT Command ==
726
727
728 Feature: Quit AT Command mode, so user need to input password again before use AT Commands.
729
730 (% style="color:#037691" %)**AT Command: AT+DISAT**
731
732 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:446px" %)
733 |=(% 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**
734 |(% style="width:161px" %)AT+DISAT|(% style="width:193px" %)Quit AT Commands mode|(% style="width:87px" %)OK
735
736 (% style="color:#037691" %)**Downlink Command:**
737
738 No downlink command for this feature.
739
740
741 == 3.5 Set system time ==
742
743
744 Feature: Set system time, unix format. [[See here for formmat detail.>>||anchor="H2.5.1A0UnixTimeStamp"]]
745
746 (% style="color:#037691" %)**AT Command:**
747
748 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:506px" %)
749 |=(% style="width: 219px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 287px;background-color:#4F81BD;color:white" %)**Function**
750 |(% style="width:218px" %)AT+TIMESTAMP=1611104352|(% style="width:285px" %)(((
751 OK
752 Set System time to 2021-01-20 00:59:12
753 )))
754
755 (% style="color:#037691" %)**Downlink Command:**
756
757 0x306007806000  ~/~/ Set timestamp to 0x(6007806000),Same as AT+TIMESTAMP=1611104352
758
759
760 == 3.6 Set Time Sync Mode ==
761
762
763 Feature: Enable/Disable Sync system time via LoRaWAN MAC Command (DeviceTimeReq), LoRaWAN server must support v1.0.3 protocol to reply this command.
764
765 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.
766
767
768 (% style="color:#037691" %)**AT Command:**
769
770 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:473px" %)
771 |=(% style="width: 159px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 314px;background-color:#4F81BD;color:white" %)**Function**
772 |(% style="width:157px" %)AT+SYNCMOD=1|(% style="width:313px" %)Enable Sync system time via LoRaWAN MAC Command (DeviceTimeReq)
773
774 (% style="color:#037691" %)**Downlink Command:**
775
776 0x28 01  ~/~/ Same As AT+SYNCMOD=1
777
778 0x28 00  ~/~/ Same As AT+SYNCMOD=0
779
780
781 == 3.7 Set Time Sync Interval ==
782
783
784 Feature: Define System time sync interval. SYNCTDC default value: 10 days.
785
786 (% style="color:#037691" %)**AT Command:**
787
788 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:469px" %)
789 |=(% style="width: 163px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 306px;background-color:#4F81BD;color:white" %)**Function**
790 |AT+SYNCTDC=0x0A|(% style="width:306px" %)Set SYNCTDC to 10 (0x0A), so the sync time is 10 days.
791
792 (% style="color:#037691" %)**Downlink Command:**
793
794 0x29 0A  ~/~/ Same as AT+SYNCTDC=0x0A
795
796
797 == 3.8 Retrieve data ==
798
799
800 Feature: Retrieval data for specify time slot.
801
802 (% style="color:#037691" %)**AT Command**(%%)**:**
803
804 No AT Command, only valid for downlink command.
805
806
807 (% style="color:#037691" %)**Downlink Command:**
808
809 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
810
811
812 == 3.9 Enable Alarm mode ==
813
814
815 Feature: Enable Alarm Mode.
816
817 (% style="color:#037691" %)**AT Command: AT_WMOD**
818
819 Total bytes: 2
820
821 Example:
822
823 0xA500: AT+WMOD=0(default)
824
825 0xA501: AT+WMOD=1(alarm mode)
826
827
828 (% style="color:#037691" %)**Downlink Command:**
829
830 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
831
832
833 == 3.10 Alarm check time ==
834
835
836 Feature: The time interval to check sensor value for Alarm.
837
838 (% style="color:#037691" %)**AT Command: AT+CITEMP**
839
840 Total bytes: 3
841
842 Example:
843
844 0xA60001: AT+CITEMP=1(default)
845
846 Set collection interval in 1min,only in alarm mode
847
848
849 (% style="color:#037691" %)**Downlink Command:**
850
851 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
852
853
854 == 3.11 Set Alarm Threshold ==
855
856
857 Feature: Set Alarm Threshold.
858
859 (% style="color:#037691" %)**AT Command: AT+ARTEMP**
860
861 Total bytes: 9  Unit: ℃
862
863 Example:
864
865 A7FF380320FF380320
866
867 AT+ARTEMP=-200,800,-200,800
868
869
870 A7000A0064000A0065
871
872 AT+ARTEMP=10,100,10,101
873
874 Channel 1 operating temp:10~~100
875
876 Channel 2 operating temp:10~~101
877
878
879 (% style="color:#037691" %)**Downlink Command:**
880
881 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
882
883
884 == 3.12 Set Calibrate Value ==
885
886
887 Feature: Set Calibrate value for PT100 cable.  Detail of use of this command please see [[connect to a customized PT100 Probe>>||anchor="H6.2A0HowtoconnectacustomizedPT100cable3F"]].
888
889 (% style="color:#037691" %)**AT Command: AT+RCABLE**
890
891 Total bytes: 5
892
893 Example:
894
895 AT+RCABLE=296,300
896
897 Channel 1 rcable=0x0128/1000=0.296R
898
899 Channel 2 rcable=0x012C/1000=0.300R
900
901
902 (% style="color:#037691" %)**Downlink Command:**
903
904 0xA80128012C  ~-~->  Same as AT+RCABLE=296,300
905
906
907 == 3.13 Poll Calibrate Value ==
908
909
910 Feature: Poll Calibrate value. LTC2 will reply with this command send an uplink to server.
911
912 (% style="color:#037691" %)**AT Command: No AT Command.**
913
914
915 (% style="color:#037691" %)**Downlink Command:**
916
917 Example: A901
918
919 End nodes will send racable config to server
920
921 Like uplink payload: 010128012C
922
923
924 == 3.14 Print data entries base on page ==
925
926
927 Feature: Print the sector data from start page to stop page (max is 400 pages).
928
929 (% style="color:#037691" %)**AT Command: AT+PDTA**
930
931 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
932 |(% style="background-color:#4f81bd; color:white; width:157px" %)**Command Example**|(% style="background-color:#4f81bd; color:white; width:353px" %)**Response**
933 |(% style="width:156px" %)(((
934
935
936 AT+PDTA=259,260
937
938 Print page 259 to 260
939
940
941 )))|(% style="width:362px" %)(((
942 Stop Tx events when read sensor data
943
944 8021600 systime= 2021/5/16 00:17:44 1 3684 Temp1=28.71 Temp2=-327.67
945
946 8021610 systime= 2021/5/16 00:37:44 1 3685 Temp1=28.78 Temp2=-327.67
947
948 8021620 systime= 2021/5/16 00:57:44 1 3684 Temp1=28.83 Temp2=-327.67
949
950 8021630 systime= 2021/5/16 01:17:44 1 3684 Temp1=28.89 Temp2=-327.67
951
952 8021640 systime= 2021/5/16 01:37:44 1 3681 Temp1=28.79 Temp2=-327.67
953
954 8021650 systime= 2021/5/16 01:57:44 1 3681 Temp1=28.67 Temp2=-327.67
955
956 8021660 systime= 2021/5/16 02:17:44 1 3684 Temp1=28.60 Temp2=-327.67
957
958 8021670 systime= 2021/5/16 02:37:44 1 3684 Temp1=28.56 Temp2=-327.67
959
960 8021680 systime= 2021/5/16 02:57:44 1 3684 Temp1=28.52 Temp2=-327.67
961
962 8021690 systime= 2021/5/16 03:17:44 1 3684 Temp1=28.51 Temp2=-327.67
963
964 80216A0 systime= 2021/5/16 03:37:44 1 3684 Temp1=28.50 Temp2=-327.67
965
966 80216B0 systime= 2021/5/16 03:57:44 1 3684 Temp1=28.46 Temp2=-327.67
967
968 80216C0 systime= 2021/5/16 04:17:44 1 3684 Temp1=28.40 Temp2=-327.67
969
970 80216D0 systime= 2021/5/16 04:37:44 1 3683 Temp1=28.37 Temp2=-327.67
971
972 80216E0 systime= 2021/5/16 04:57:44 1 3684 Temp1=28.36 Temp2=-327.67
973
974 80216F0 systime= 2021/5/16 05:17:44 1 3685 Temp1=28.32 Temp2=-327.67
975
976 Start Tx events
977
978 OK
979 )))
980
981 (% style="color:#037691" %)**Downlink Command:**
982
983 No downlink commands for feature
984
985
986 == 3.15 Print last few data entries ==
987
988
989 Feature: Print the last few data entries
990
991 (% style="color:#037691" %)**AT Command: AT+PLDTA**
992
993 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
994 |(% style="background-color:#4f81bd; color:white; width:156px" %)**Command Example**|(% style="background-color:#4f81bd; color:white; width:354px" %)**Response**
995 |(((
996 AT+PLDTA=5
997
998 Print last 5 entries
999 )))|(% style="width:278px" %)(((
1000 Stop Tx events when read sensor data
1001
1002 1 systime= 2021/5/17 03:12:37 1 3681 Temp1=26.01 Temp2=-327.67
1003
1004 2 systime= 2021/5/17 03:17:37 1 3682 Temp1=26.02 Temp2=-327.67
1005
1006 3 systime= 2021/5/17 03:22:37 1 3687 Temp1=25.94 Temp2=-327.67
1007
1008 4 systime= 2021/5/17 03:27:37 1 3684 Temp1=25.95 Temp2=-327.67
1009
1010 5 systime= 2021/5/17 03:32:37 1 3684 Temp1=26.20 Temp2=-327.67
1011
1012 Start Tx events
1013
1014 OK
1015 )))
1016
1017 (% style="color:#037691" %)**Downlink Command:**
1018
1019 No downlink commands for feature
1020
1021
1022 == 3.16 Clear Flash Record ==
1023
1024
1025 Feature: Clear flash storage for data log feature.
1026
1027 (% style="color:#037691" %)**AT Command: AT+CLRDTA**
1028
1029 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
1030 |=(% 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**
1031 |(% style="width:157px" %)AT+CLRDTA|(% style="width:136px" %)Clear date record|(% style="width:213px" %)(((
1032 Clear all stored sensor data…
1033 OK
1034 )))
1035
1036 (% style="color:#037691" %)**Downlink Command: 0xA3**
1037
1038 * Example: 0xA301  ~/~/  Same as AT+CLRDTA
1039
1040 = 4.  Battery & Power Consumption =
1041
1042
1043 LTC2 uses ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.
1044
1045 [[**Battery Info & Power Consumption Analyze**>>url:http://wiki.dragino.com/xwiki/bin/view/Main/How%20to%20calculate%20the%20battery%20life%20of%20Dragino%20sensors%3F/]] .
1046
1047
1048 = 5.  Firmware Change Log and Upload Firmware =
1049
1050
1051 (((
1052 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:
1053 )))
1054
1055 (((
1056
1057 )))
1058
1059 (((
1060 **Connection:**
1061 )))
1062
1063 * (((
1064 (% style="background-color:yellow" %)**ST-LINK v2 GND  <~-~->  LTC2 GND**
1065 )))
1066 * (((
1067 (% style="background-color:yellow" %)**ST-LINK v2 RESET  <~-~->  LTC2 NRST**
1068 )))
1069 * (((
1070 (% style="background-color:yellow" %)**ST-LINK v2 SWCLK  <~-~->  LTC2 SWCLK**
1071 )))
1072 * (((
1073 (% style="background-color:yellow" %)**ST-LINK v2 SWDIO  <~-~->  LTC2 SWDIO**
1074 )))
1075 * (((
1076 (% style="background-color:yellow" %)**LTC2 power must be on.  **
1077 )))
1078
1079 (((
1080
1081
1082 **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]]
1083
1084
1085 )))
1086
1087 = 6.  FAQ =
1088
1089 == 6.1  How to use AT Command to configure LTC2 ==
1090
1091
1092 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.
1093
1094
1095 **Connection:**
1096
1097 * (% style="background-color:yellow" %)**USB to TTL GND <~-~->  LTC2 GND**
1098
1099 * (% style="background-color:yellow" %)**USB to TTL RXD  <~-~->  LTC2 TXD**
1100
1101 * (% style="background-color:yellow" %)**USB to TTL TXD  <~-~->  LTC2 RXD**
1102
1103 (((
1104 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.
1105 )))
1106
1107
1108 (((
1109 Input password and ATZ to activate LTC2,As shown below:
1110 )))
1111
1112 [[image:image-20220620151601-13.png||height="393" width="1042"]]
1113
1114
1115 == 6.2  How to connect a customized PT100 cable? ==
1116
1117
1118 (((
1119 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. 
1120 )))
1121
1122
1123 (((
1124 (% 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.
1125 )))
1126
1127 [[image:image-20220620152115-14.jpeg||height="548" width="763"]]
1128
1129 We know that the Multimeter has a shortcut resistance 0.002 ohm.
1130
1131
1132 (% style="color:blue" %)**Step 2**(%%): Measure the resistance between the two shorted wires of PT100 Probe.
1133
1134
1135 [[image:image-20220620152115-15.jpeg||height="791" width="704"]]
1136
1137 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) .
1138
1139
1140 (% style="color:blue" %)**Step 3**(%%): Run Calibrate Command.
1141
1142 Run this command to both channels to use 0.296R calibrate resistance.
1143
1144 (% style="color:red" %)**AT+RCABLE=296,0** (%%) ~-~->  Calibrate Channel 1 with 0.296R
1145
1146
1147 Or use LoRaWAN downlink command (0xA8 Code) to set: 0xA801280000
1148
1149 User can use 0xA9 downlink command to poll the current calibration value.
1150
1151
1152 (% style="color:blue" %)**Step 4**(%%)**: **Connect the PT100 to LTC2
1153
1154 [[image:image-20220620152115-16.png]]
1155
1156
1157 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.
1158
1159
1160 == 6.3  What is the frequency range of LTC2 LoRa part? ==
1161
1162
1163 Different LTC2 version supports different frequency range, below is the table for the working frequency and recommend bands for each model:
1164
1165 [[image:image-20230427172553-5.jpeg||height="146" width="639"]]
1166
1167
1168 == 6.4  How to change the LoRa Frequency Bands/Region ==
1169
1170
1171 You can follow the instructions for [[how to upgrade image>>||anchor="H5.A0FirmwareChangeLogandUploadFirmware"]].
1172 When downloading the images, choose the required image file for download. ​
1173
1174 (% style="display:none" %) (%%)
1175
1176
1177 == 6.5 How can I read sensor data without LoRaWAN? For Calibration Purpose ==
1178
1179 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.
1180
1181 [[image:image-20240417153156-3.jpeg||height="636" width="930"]]
1182
1183
1184 After there is UART Connection, reset the node.
1185
1186 Example output:
1187
1188 [[image:image-20240312141207-3.png||height="527" width="930"]]
1189
1190
1191 == 6.6 LTC2 supported with 3-wire PT100 ==
1192
1193 The LTC2 uses the bridge method to measure temperature and supports the use of 3-wire PT100.
1194
1195 The difference between the wiring mode of three-wire PT100 and four-wire PT100 and the difference in the detection principle：
1196
1197 * Three wire PT100 adopts bridge method to measure data, and the relationship between the output temperature value and the output value of analog quantity.
1198 * The four-wire PT100 has no bridge, is sent by constant current source, voltmeter measurement, and finally gives the measured resistance value.
1199
1200 [[image:image-20240417145507-1.jpeg||height="234" width="522"]]
1201
1202 [[image:image-20240417145520-2.jpeg||height="182" width="523"]]
1203
1204
1205 **Note:** **2-wire PT100, current loop and voltage measurement loop combined in one, poor accuracy, not discussed.**
1206
1207
1208
1209 = 7.  Trouble Shooting =
1210
1211 == 7.1  AT Command input doesn't work ==
1212
1213
1214 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.
1215
1216
1217 = 8.  Order Info =
1218
1219
1220 Part Number **:** (% style="color:blue" %)**LTC2-XXX-YYY**
1221
1222 (% style="color:#0000ff" %)**XXX**(%%)**: **Probe Version
1223
1224 * (% style="color:red" %)**SI**(%%):  Standard IP68 probe x 1
1225 * (% style="color:red" %)**LT**(%%):  Low Temperature probe x 1
1226 * (% style="color:red" %)**HT**(%%): High Temperature probe x 1
1227 * (% style="color:red" %)**FSA**(%%):  Food Safety probe x 1
1228 * (% style="color:red" %)**FT**(%%):  Flat Type probe x 1
1229 * (% style="color:red" %)**NA**(%%): No probe
1230
1231 (% style="color:#0000ff" %)**YYY**(%%)**: **The default frequency band
1232
1233 * (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band
1234 * (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band
1235 * (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band
1236 * (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band
1237 * (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band
1238 * (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band
1239 * (% style="color:red" %)**IN865 **(%%)**:**  LoRaWAN IN865 band
1240 * (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band
1241
1242 = 9. ​ Packing Info =
1243
1244
1245 **Package Includes**:
1246
1247 * LTC2 LoRaWAN Temperature Transmitter x 1
1248
1249 **Dimension and weight**:
1250
1251 * Device Size: cm
1252 * Device Weight: g
1253 * Package Size / pcs : cm
1254 * Weight / pcs : g
1255
1256 = 10.  ​Support =
1257
1258
1259 * 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.
1260 * 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]].
1261
1262