Skip to Content
Version 315.2 by Xiaoling on 2025/02/12 08:47
Show last authors
1 (% aria-label="image-20220611143226-1.png image widget" contenteditable="false" role="region" tabindex="-1" %)
2 (((
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"]]
4 )))
5
6 (% style="text-align:center" %)
7 [[image:image-20220617163631-2.jpeg||height="704" width="617"]]
8
9
10 **Table of Contents:**
11
12 {{toc/}}
13
14 (% aria-label="macro:toc widget" contenteditable="false" role="region" tabindex="-1" %)
15 (((
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"]]
17 )))
18
19
20
21
22
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 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.
332
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
345 Below is TTN screen shot:
346
347 * Create Application first.
348 * Manually Add a LoRaWAN End Device device. Choose **OTAA** and **MAC v1.0.3**
349
350 [[image:1655690861020-685.png]]
351
352
353 [[image:1655690877643-259.png]]
354
355
356 Input the OTAA keys for LTC2.
357
358 Each LTC2 is shipped with a sticker with the default device EUI as below:
359
360 [[image:image-20230426083905-2.png||height="272" width="586"]]
361
362
363 * **Input these keys to device portal.**
364
365 [[image:image-20220620100853-1.png]]
366
367
368
369 * **Choose the Frequency band for this end node.**
370
371 [[image:image-20220620100853-2.png]]
372
373
374 * **Input APP Key in this page as well. **
375
376 [[image:image-20220620100853-3.png]]
377
378
379 Add payload formatter So TTNv3 knows how to parse the LTC2 upload value.
380
381 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]]
382
383
384 [[image:image-20220620100853-4.png||height="496" width="1097"]]
385
386
387 === 2.3.2  Step 2: Power on LTC2 ===
388
389
390 LTC2 is power off when ship from factory.
391
392 Put a Jumper on JP2 to power on the device.
393
394
395 [[image:1655691076464-442.png]]
396
397
398 (((
399 After power on, LTC2 will auto join to TTN network via the LoRaWAN coverage by DLOS8. After join success, LTC2 will start to update message to IoT server.
400 )))
401
402 (((
403 Below is an example uplink message which shows the LTC2 is sending Join Request to TTNv3.
404 )))
405
406
407 [[image:1655691086647-147.png]]
408
409
410 After join successful, LTC2 will send uplink message with the sensor value.
411
412 [[image:1655691100066-163.png]]
413
414 Above value shows Channel1 detect 25.94 degree. There is no PT100 connected on Channel 2, so it shows -327.67.
415 )))
416
417
418 == 2.4  ​Uplink Payload ==
419
420
421 Below is the uplink payload which shows.
422
423 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:390px" %)
424 |=(% style="width: 70px;background-color:#4F81BD;color:white" %)(((
425 **Size(bytes)**
426 )))|=(% 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**
427 |(% style="width:62.5px" %)Value|(((
428 [[BAT>>||anchor="HBAT"]]
429 )))|(((
430 [[Status & EXT>>||anchor="HStatus26EXT"]]
431 )))|(((
432 [[Channel 1 data>>||anchor="HChannel1dataandChannel2data"]]
433 )))|(((
434 [[Channel 2 data>>||anchor="HChannel1dataandChannel2data"]]
435 )))|(((
436 [[Unix TimeStamp>>||anchor="HUnixTimeStamp"]]
437 )))
438
439 (% 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"]]
440
441
442 (((
443 === (% style="color:blue" %)**BAT**(%%) ===
444
445
446 Ex1: 0x0E3C ⇒ 3644 (mV) = 3.644 V
447
448 (% class="wikigeneratedid" %)
449
450 )))
451
452 (((
453 === (% style="color:blue" %)**Status & EXT**(%%) ===
454 )))
455
456 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:500px" %)
457 |(% 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]**
458 |(% 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)
459
460 * (% style="color:#037691" %)**Poll Message Flag**(%%):  1: This message is a poll message reply, 0: means this is a normal uplink.
461 * (% 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.
462 * (% 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)
463 * (% style="color:#037691" %)**EXT**(%%):  The decode method for Channel 1 data and Channel 2 data
464 ** 0b(0001): Upload PT100 temperature, with 2 decimals, range:  **-327.67 ~~ 327.67 ℃**
465 ** 0b(0010): Upload PT100 temperature, with 1 decimals, range: ** -3276.7 ~~ 3276.7 ℃**
466 ** 0b(0011): Upload Resistance instead of Temperature, range:  **-327.67~~ 327.67 ohm**
467
468 (((
469 (% class="wikigeneratedid" %)
470
471
472
473 === (% style="color:blue" %)**Channel 1 data and Channel 2 data**(%%) ===
474
475 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:515px" %)
476 |(% 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)**
477 |(% 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
478 |(% 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
479 )))
480
481 (((
482 (% class="wikigeneratedid" %)
483
484
485 === (% style="color:blue" %)**Unix TimeStamp**(%%) ===
486 )))
487
488 Refer to Datalog feature.
489
490 (% style="color:#037691" %)**Example Uplink Payload**:
491
492
493 **Uplink payload example 1:**  0CE9011422EC2D6073E83B
494
495 * Bat voltage:0x0CE9 =3305mV
496 * Ext=0x01
497 * Channel1 temp=0x1422/100=51.54 ℃
498 * Channel2 temp=(0xEC2D-65536)/100=-50.75 ℃
499 * System timestamp=0x6073E83B= 1618208827(UTC)
500
501 If payload is: EC2DH : (EC2D & 8000 == 1), temp = (EC2DH - 65536)/100 = -50.75 ℃
502
503 (EC2D & 8000: Judge whether the highest bit is 1, when the highest bit is 1, it is negative)
504
505
506 **Uplink payload example 2: ** 0CED020203FE056073E697
507
508 * Bat voltage:0x0CED =3309mV
509 * Ext=0x02
510 * Channel1 temp=0x0203/10=515.4 ℃
511 * Channel2 temp=(0xFE05-65536)/10=-507.5 ℃
512 * System timestamp=0x6073E697=1618208407(UTC)
513
514 If payload is: FE05H :  (FE05 & 8000 == 1) , temp = (FE05H - 65536)/100 = 507.5 ℃
515
516 (EC2D & 8000: Judge whether the highest bit is 1, when the highest bit is 1, it is negative)
517
518
519 **Uplink payload example 3 :**  0CE9032EDE1F406073E967
520
521 * Bat voltage:0x0CE9 =3305mV
522 * Ext=0x03
523 * Channel1 res=0x2EDE/100=119.98 ohm
524 * Channel2 res=0x1F40/100=80.00 ohm
525 * System timestamp=0x6073E967= 1618209127(UTC)
526
527 (% 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" %)​(%%)​
528
529
530 == 2.5  ​Alarm Mode ==
531
532
533 (((
534 LTC2 can monito the temperature in every CTTEMP time, when the temperature exceed the limit , it will uplink the sensor value immediately.
535
536 Detail commands see:
537
538 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Enable Alarm Mode**>>||anchor="H3.9EnableAlarmmode"]]
539 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Config Alarm Sampling Time**>>||anchor="H3.10Alarmchecktime"]]
540 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Set Alarm Threshold**>>||anchor="H3.11SetAlarmThreshold"]]
541
542
543 )))
544
545
546 = 3.  Configure LTC2 via AT Command or LoRaWAN Downlink =
547
548
549 (((
550 (((
551 Use can configure LTC2 via AT Command or LoRaWAN Downlink.
552 )))
553 )))
554
555 * (((
556 (((
557 AT Command Connection: See [[FAQ>>||anchor="H6.A0FAQ"]].
558 )))
559 )))
560 * (((
561 (((
562 LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]]
563 )))
564 )))
565
566 (((
567 (((
568
569 )))
570
571 (((
572 There are two kinds of commands to configure LTC2, they are:
573 )))
574 )))
575
576 * (((
577 (((
578 (% style="color:#4f81bd" %)** General Commands**.
579 )))
580 )))
581
582 (((
583 (((
584 These commands are to configure:
585 )))
586 )))
587
588 * (((
589 (((
590 General system settings like: uplink interval.
591 )))
592 )))
593 * (((
594 (((
595 LoRaWAN protocol & radio related command.
596 )))
597 )))
598
599 (((
600 (((
601 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]]
602 )))
603 )))
604
605 (((
606 (((
607
608 )))
609 )))
610
611 * (((
612 (((
613 (% style="color:#4f81bd" %)** Commands special design for LTC2**
614 )))
615 )))
616
617 (((
618 (((
619 These commands only valid for LTC2, as below:(% title="Click and drag to resize" %)​
620 )))
621 )))
622
623 (% 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" %)​
624
625
626 == 3.1  Set Transmit Interval Time ==
627
628
629 Feature: Change LoRaWAN End Node Transmit Interval.
630
631 (% style="color:#037691" %)**AT Command: AT+TDC**
632
633 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:501px" %)
634 |(% 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**
635 |(% style="width:155px" %)AT+TDC=?|(% style="width:162px" %)Show current transmit Interval|(% style="width:177px" %)(((
636 30000
637 OK
638 the interval is 30000ms = 30s
639 )))
640 |(% style="width:155px" %)AT+TDC=60000|(% style="width:162px" %)Set Transmit Interval|(% style="width:177px" %)(((
641 OK
642 Set transmit interval to 60000ms = 60 seconds
643 )))
644
645 (((
646 (% style="color:#037691" %)**Downlink Command: 0x01**
647 )))
648
649 (((
650 (((
651 Format: Command Code (0x01) followed by 3 bytes time value.
652
653 (((
654 If the downlink payload=0100003C, it means set the END Node's Transmit Interval to 0x00003C=60(S), while type code is 01.
655 )))
656
657 * Example 1: Downlink Payload: 0100001E  ~/~/  Set Transmit Interval (TDC) = 30 seconds
658 * Example 2: Downlink Payload: 0100003C  ~/~/  Set Transmit Interval (TDC) = 60 seconds
659 )))
660 )))
661
662
663
664 == 3.2  Enable PT100 channels ==
665
666
667 Feature: Enable PT100 channels. Default only Enable Channel 1
668
669 (% style="color:#037691" %)**AT Command: AT+ENPTCHNUM**
670
671 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:494px" %)
672 |=(% 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**
673 |(% style="width:164px" %)AT+ENPTCHNUM=?|(% style="width:254px" %)Get current ENPTCHNUM settings|(% colspan="1" rowspan="3" style="width:74px" %)(((
674 1
675
676 OK
677 )))
678 |(% style="width:164px" %)AT+ ENPTCHNUM =1|(% colspan="1" style="width:254px" %)Enable channel 1
679 |(% style="width:164px" %)AT+ ENPTCHNUM =2|(% colspan="1" style="width:254px" %)Enable channel 1 and 2
680
681 (% style="color:#037691" %)**Downlink Command: 0xA1**
682
683 Total bytes: 2 bytes
684
685 Example:
686
687 * 0xA101: same as AT+ENPTCHNUM =1
688 * 0xA102: same as AT+ENPTCHNUM =2
689
690 == 3.3  Set External Sensor Mode ==
691
692
693 (((
694 Feature: Change External Sensor Mode.
695 )))
696
697 (((
698 (% style="color:#037691" %)**Downlink Command: AT+EXT**
699 )))
700
701 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:431px" %)
702 |=(% 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**
703 |(% style="width:155px" %)AT+EXT=?|(% style="width:180px" %)Get current EXT settings|(% colspan="1" rowspan="4" style="width:86px" %)(((
704 1
705 OK
706 )))
707 |(% style="width:155px" %)AT+EXT=1|(% colspan="1" style="width:180px" %)Set EXT to 0b(0001)
708 |(% style="width:155px" %)AT+EXT=2|(% colspan="1" style="width:180px" %)Set EXT to 0b(0010)
709 |(% style="width:155px" %)AT+EXT=3|(% colspan="1" style="width:180px" %)Set EXT to 0b(0011)
710
711 (% style="color:#037691" %)**Downlink Command: 0xA2**
712
713 Total bytes: 2 bytes
714
715 Example:
716
717 * 0xA201: same as AT+EXT=1
718
719 == 3.4 Quit AT Command ==
720
721
722 Feature: Quit AT Command mode, so user need to input password again before use AT Commands.
723
724 (% style="color:#037691" %)**AT Command: AT+DISAT**
725
726 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:446px" %)
727 |=(% 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**
728 |(% style="width:161px" %)AT+DISAT|(% style="width:193px" %)Quit AT Commands mode|(% style="width:87px" %)OK
729
730 (% style="color:#037691" %)**Downlink Command:**
731
732 No downlink command for this feature.
733
734
735 == 3.5 Set system time ==
736
737
738 Feature: Set system time, unix format. [[See here for formmat detail.>>||anchor="H2.5.1A0UnixTimeStamp"]]
739
740 (% style="color:#037691" %)**AT Command:**
741
742 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:506px" %)
743 |=(% style="width: 219px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 287px;background-color:#4F81BD;color:white" %)**Function**
744 |(% style="width:218px" %)AT+TIMESTAMP=1611104352|(% style="width:285px" %)(((
745 OK
746 Set System time to 2021-01-20 00:59:12
747 )))
748
749 (% style="color:#037691" %)**Downlink Command:**
750
751 0x306007806000  ~/~/ Set timestamp to 0x(6007806000),Same as AT+TIMESTAMP=1611104352
752
753
754 == 3.6 Set Time Sync Mode ==
755
756
757 Feature: Enable/Disable Sync system time via LoRaWAN MAC Command (DeviceTimeReq), LoRaWAN server must support v1.0.3 protocol to reply this command.
758
759 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.
760
761
762 (% style="color:#037691" %)**AT Command:**
763
764 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:473px" %)
765 |=(% style="width: 159px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 314px;background-color:#4F81BD;color:white" %)**Function**
766 |(% style="width:157px" %)AT+SYNCMOD=1|(% style="width:313px" %)Enable Sync system time via LoRaWAN MAC Command (DeviceTimeReq)
767
768 (% style="color:#037691" %)**Downlink Command:**
769
770 0x28 01  ~/~/ Same As AT+SYNCMOD=1
771
772 0x28 00  ~/~/ Same As AT+SYNCMOD=0
773
774
775 == 3.7 Set Time Sync Interval ==
776
777
778 Feature: Define System time sync interval. SYNCTDC default value: 10 days.
779
780 (% style="color:#037691" %)**AT Command:**
781
782 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:469px" %)
783 |=(% style="width: 163px;background-color:#4F81BD;color:white" %)**Command Example**|=(% style="width: 306px;background-color:#4F81BD;color:white" %)**Function**
784 |AT+SYNCTDC=0x0A|(% style="width:306px" %)Set SYNCTDC to 10 (0x0A), so the sync time is 10 days.
785
786 (% style="color:#037691" %)**Downlink Command:**
787
788 0x29 0A  ~/~/ Same as AT+SYNCTDC=0x0A
789
790
791 == 3.8 Retrieve data ==
792
793
794 Feature: Retrieval data for specify time slot.
795
796 (% style="color:#037691" %)**AT Command**(%%)**:**
797
798 No AT Command, only valid for downlink command.
799
800
801 (% style="color:#037691" %)**Downlink Command:**
802
803 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
804
805
806 == 3.9 Enable Alarm mode ==
807
808
809 Feature: Enable Alarm Mode.
810
811 (% style="color:#037691" %)**AT Command: AT_WMOD**
812
813 Total bytes: 2
814
815 Example:
816
817 0xA500: AT+WMOD=0(default)
818
819 0xA501: AT+WMOD=1(alarm mode)
820
821
822 (% style="color:#037691" %)**Downlink Command:**
823
824 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
825
826
827 == 3.10 Alarm check time ==
828
829
830 Feature: The time interval to check sensor value for Alarm.
831
832 (% style="color:#037691" %)**AT Command: AT+CITEMP**
833
834 Total bytes: 3
835
836 Example:
837
838 0xA60001: AT+CITEMP=1(default)
839
840 Set collection interval in 1min,only in alarm mode
841
842
843 (% style="color:#037691" %)**Downlink Command:**
844
845 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
846
847
848 == 3.11 Set Alarm Threshold ==
849
850
851 Feature: Set Alarm Threshold.
852
853 (% style="color:#037691" %)**AT Command: AT+ARTEMP**
854
855 Total bytes: 9  Unit: ℃
856
857 Example:
858
859 A7FF380320FF380320
860
861 AT+ARTEMP=-200,800,-200,800
862
863
864 A7000A0064000A0065
865
866 AT+ARTEMP=10,100,10,101
867
868 Channel 1 operating temp:10~~100
869
870 Channel 2 operating temp:10~~101
871
872
873 (% style="color:#037691" %)**Downlink Command:**
874
875 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
876
877
878 == 3.12 Set Calibrate Value ==
879
880
881 Feature: Set Calibrate value for PT100 cable.  Detail of use of this command please see [[connect to a customized PT100 Probe>>||anchor="H6.2A0HowtoconnectacustomizedPT100cable3F"]].
882
883 (% style="color:#037691" %)**AT Command: AT+RCABLE**
884
885 Total bytes: 5
886
887 Example:
888
889 AT+RCABLE=296,300
890
891 Channel 1 rcable=0x0128/1000=0.296R
892
893 Channel 2 rcable=0x012C/1000=0.300R
894
895
896 (% style="color:#037691" %)**Downlink Command:**
897
898 0xA80128012C  ~-~->  Same as AT+RCABLE=296,300
899
900
901 == 3.13 Poll Calibrate Value ==
902
903
904 Feature: Poll Calibrate value. LTC2 will reply with this command send an uplink to server.
905
906 (% style="color:#037691" %)**AT Command: No AT Command.**
907
908
909 (% style="color:#037691" %)**Downlink Command:**
910
911 Example: A901
912
913 End nodes will send racable config to server
914
915 Like uplink payload: 010128012C
916
917
918 == 3.14 Print data entries base on page ==
919
920
921 Feature: Print the sector data from start page to stop page (max is 400 pages).
922
923 (% style="color:#037691" %)**AT Command: AT+PDTA**
924
925 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
926 |(% style="background-color:#4f81bd; color:white; width:157px" %)**Command Example**|(% style="background-color:#4f81bd; color:white; width:353px" %)**Response**
927 |(% style="width:156px" %)(((
928
929
930 AT+PDTA=259,260
931
932 Print page 259 to 260
933
934
935 )))|(% style="width:362px" %)(((
936 Stop Tx events when read sensor data
937
938 8021600 systime= 2021/5/16 00:17:44 1 3684 Temp1=28.71 Temp2=-327.67
939
940 8021610 systime= 2021/5/16 00:37:44 1 3685 Temp1=28.78 Temp2=-327.67
941
942 8021620 systime= 2021/5/16 00:57:44 1 3684 Temp1=28.83 Temp2=-327.67
943
944 8021630 systime= 2021/5/16 01:17:44 1 3684 Temp1=28.89 Temp2=-327.67
945
946 8021640 systime= 2021/5/16 01:37:44 1 3681 Temp1=28.79 Temp2=-327.67
947
948 8021650 systime= 2021/5/16 01:57:44 1 3681 Temp1=28.67 Temp2=-327.67
949
950 8021660 systime= 2021/5/16 02:17:44 1 3684 Temp1=28.60 Temp2=-327.67
951
952 8021670 systime= 2021/5/16 02:37:44 1 3684 Temp1=28.56 Temp2=-327.67
953
954 8021680 systime= 2021/5/16 02:57:44 1 3684 Temp1=28.52 Temp2=-327.67
955
956 8021690 systime= 2021/5/16 03:17:44 1 3684 Temp1=28.51 Temp2=-327.67
957
958 80216A0 systime= 2021/5/16 03:37:44 1 3684 Temp1=28.50 Temp2=-327.67
959
960 80216B0 systime= 2021/5/16 03:57:44 1 3684 Temp1=28.46 Temp2=-327.67
961
962 80216C0 systime= 2021/5/16 04:17:44 1 3684 Temp1=28.40 Temp2=-327.67
963
964 80216D0 systime= 2021/5/16 04:37:44 1 3683 Temp1=28.37 Temp2=-327.67
965
966 80216E0 systime= 2021/5/16 04:57:44 1 3684 Temp1=28.36 Temp2=-327.67
967
968 80216F0 systime= 2021/5/16 05:17:44 1 3685 Temp1=28.32 Temp2=-327.67
969
970 Start Tx events
971
972 OK
973 )))
974
975 (% style="color:#037691" %)**Downlink Command:**
976
977 No downlink commands for feature
978
979
980 == 3.15 Print last few data entries ==
981
982
983 Feature: Print the last few data entries
984
985 (% style="color:#037691" %)**AT Command: AT+PLDTA**
986
987 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
988 |(% style="background-color:#4f81bd; color:white; width:156px" %)**Command Example**|(% style="background-color:#4f81bd; color:white; width:354px" %)**Response**
989 |(((
990 AT+PLDTA=5
991
992 Print last 5 entries
993 )))|(% style="width:278px" %)(((
994 Stop Tx events when read sensor data
995
996 1 systime= 2021/5/17 03:12:37 1 3681 Temp1=26.01 Temp2=-327.67
997
998 2 systime= 2021/5/17 03:17:37 1 3682 Temp1=26.02 Temp2=-327.67
999
1000 3 systime= 2021/5/17 03:22:37 1 3687 Temp1=25.94 Temp2=-327.67
1001
1002 4 systime= 2021/5/17 03:27:37 1 3684 Temp1=25.95 Temp2=-327.67
1003
1004 5 systime= 2021/5/17 03:32:37 1 3684 Temp1=26.20 Temp2=-327.67
1005
1006 Start Tx events
1007
1008 OK
1009 )))
1010
1011 (% style="color:#037691" %)**Downlink Command:**
1012
1013 No downlink commands for feature
1014
1015
1016 == 3.16 Clear Flash Record ==
1017
1018
1019 Feature: Clear flash storage for data log feature.
1020
1021 (% style="color:#037691" %)**AT Command: AT+CLRDTA**
1022
1023 (% border="1" cellspacing="3" style="background-color:#f2f2f2; width:510px" %)
1024 |=(% 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**
1025 |(% style="width:157px" %)AT+CLRDTA|(% style="width:136px" %)Clear date record|(% style="width:213px" %)(((
1026 Clear all stored sensor data…
1027 OK
1028 )))
1029
1030 (% style="color:#037691" %)**Downlink Command: 0xA3**
1031
1032 * Example: 0xA301  ~/~/  Same as AT+CLRDTA
1033
1034 = 4.  Battery & Power Consumption =
1035
1036
1037 LTC2 uses ER26500 + SPC1520 battery pack. See below link for detail information about the battery info and how to replace.
1038
1039 [[**Battery Info & Power Consumption Analyze**>>url:http://wiki.dragino.com/xwiki/bin/view/Main/How%20to%20calculate%20the%20battery%20life%20of%20Dragino%20sensors%3F/]] .
1040
1041
1042 = 5.  Firmware Change Log and Upload Firmware =
1043
1044
1045 (((
1046 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:
1047 )))
1048
1049 (((
1050
1051 )))
1052
1053 (((
1054 **Connection:**
1055 )))
1056
1057 * (((
1058 (% style="background-color:yellow" %)**ST-LINK v2 GND  <~-~->  LTC2 GND**
1059 )))
1060 * (((
1061 (% style="background-color:yellow" %)**ST-LINK v2 RESET  <~-~->  LTC2 NRST**
1062 )))
1063 * (((
1064 (% style="background-color:yellow" %)**ST-LINK v2 SWCLK  <~-~->  LTC2 SWCLK**
1065 )))
1066 * (((
1067 (% style="background-color:yellow" %)**ST-LINK v2 SWDIO  <~-~->  LTC2 SWDIO**
1068 )))
1069 * (((
1070 (% style="background-color:yellow" %)**LTC2 power must be on.  **
1071 )))
1072
1073 (((
1074
1075
1076 **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]]
1077
1078
1079 )))
1080
1081 = 6.  FAQ =
1082
1083 == 6.1  How to use AT Command to configure LTC2 ==
1084
1085
1086 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.
1087
1088
1089 **Connection:**
1090
1091 * (% style="background-color:yellow" %)**USB to TTL GND <~-~->  LTC2 GND**
1092
1093 * (% style="background-color:yellow" %)**USB to TTL RXD  <~-~->  LTC2 TXD**
1094
1095 * (% style="background-color:yellow" %)**USB to TTL TXD  <~-~->  LTC2 RXD**
1096
1097 (((
1098 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.
1099 )))
1100
1101
1102 (((
1103 Input password and ATZ to activate LTC2,As shown below:
1104 )))
1105
1106 [[image:image-20220620151601-13.png||height="393" width="1042"]]
1107
1108
1109 == 6.2  How to connect a customized PT100 cable? ==
1110
1111
1112 (((
1113 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. 
1114 )))
1115
1116
1117 (((
1118 (% 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.
1119 )))
1120
1121 [[image:image-20220620152115-14.jpeg||height="548" width="763"]]
1122
1123 We know that the Multimeter has a shortcut resistance 0.002 ohm.
1124
1125
1126 (% style="color:blue" %)**Step 2**(%%): Measure the resistance between the two shorted wires of PT100 Probe.
1127
1128
1129 [[image:image-20220620152115-15.jpeg||height="791" width="704"]]
1130
1131 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) .
1132
1133
1134 (% style="color:blue" %)**Step 3**(%%): Run Calibrate Command.
1135
1136 Run this command to both channels to use 0.296R calibrate resistance.
1137
1138 (% style="color:red" %)**AT+RCABLE=296,0** (%%) ~-~->  Calibrate Channel 1 with 0.296R
1139
1140
1141 Or use LoRaWAN downlink command (0xA8 Code) to set: 0xA801280000
1142
1143 User can use 0xA9 downlink command to poll the current calibration value.
1144
1145
1146 (% style="color:blue" %)**Step 4**(%%)**: **Connect the PT100 to LTC2
1147
1148 [[image:image-20220620152115-16.png]]
1149
1150
1151 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.
1152
1153
1154 == 6.3  What is the frequency range of LTC2 LoRa part? ==
1155
1156
1157 Different LTC2 version supports different frequency range, below is the table for the working frequency and recommend bands for each model:
1158
1159 [[image:image-20230427172553-5.jpeg||height="146" width="639"]]
1160
1161
1162 == 6.4  How to change the LoRa Frequency Bands/Region ==
1163
1164
1165 You can follow the instructions for [[how to upgrade image>>||anchor="H5.A0FirmwareChangeLogandUploadFirmware"]].
1166 When downloading the images, choose the required image file for download. ​
1167
1168 (% style="display:none" %) (%%)
1169
1170
1171 == 6.5 How can I read sensor data without LoRaWAN? For Calibration Purpose ==
1172
1173 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.
1174
1175 [[image:image-20240417153156-3.jpeg||height="636" width="930"]]
1176
1177
1178 After there is UART Connection, reset the node.
1179
1180 Example output:
1181
1182 [[image:image-20240312141207-3.png||height="527" width="930"]]
1183
1184
1185 == 6.6 LTC2 supported with 3-wire PT100 ==
1186
1187 The LTC2 uses the bridge method to measure temperature and supports the use of 3-wire PT100.
1188
1189 The difference between the wiring mode of three-wire PT100 and four-wire PT100 and the difference in the detection principle：
1190
1191 * Three wire PT100 adopts bridge method to measure data, and the relationship between the output temperature value and the output value of analog quantity.
1192 * The four-wire PT100 has no bridge, is sent by constant current source, voltmeter measurement, and finally gives the measured resistance value.
1193
1194 [[image:image-20240417145507-1.jpeg||height="234" width="522"]]
1195
1196 [[image:image-20240417145520-2.jpeg||height="182" width="523"]]
1197
1198
1199 **Note:** **2-wire PT100, current loop and voltage measurement loop combined in one, poor accuracy, not discussed.**
1200
1201
1202
1203 = 7.  Trouble Shooting =
1204
1205 == 7.1  AT Command input doesn't work ==
1206
1207
1208 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.
1209
1210
1211 = 8.  Order Info =
1212
1213
1214 Part Number **:** (% style="color:blue" %)**LTC2-XXX-YYY**
1215
1216 (% style="color:#0000ff" %)**XXX**(%%)**: **Probe Version
1217
1218 * (% style="color:red" %)**SI**(%%):  Standard IP68 probe x 1
1219 * (% style="color:red" %)**LT**(%%):  Low Temperature probe x 1
1220 * (% style="color:red" %)**HT**(%%): High Temperature probe x 1
1221 * (% style="color:red" %)**FSA**(%%):  Food Safety probe x 1
1222 * (% style="color:red" %)**FT**(%%):  Flat Type probe x 1
1223 * (% style="color:red" %)**NA**(%%): No probe
1224
1225 (% style="color:#0000ff" %)**YYY**(%%)**: **The default frequency band
1226
1227 * (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band
1228 * (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band
1229 * (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band
1230 * (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band
1231 * (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band
1232 * (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band
1233 * (% style="color:red" %)**IN865 **(%%)**:**  LoRaWAN IN865 band
1234 * (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band
1235
1236 = 9. ​ Packing Info =
1237
1238
1239 **Package Includes**:
1240
1241 * LTC2 LoRaWAN Temperature Transmitter x 1
1242
1243 **Dimension and weight**:
1244
1245 * Device Size: cm
1246 * Device Weight: g
1247 * Package Size / pcs : cm
1248 * Weight / pcs : g
1249
1250 = 10.  ​Support =
1251
1252
1253 * 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.
1254 * 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]].
1255
1256