Version 279.1 by Xiaoling on 2022/07/01 15:54
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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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8
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10 **Table of Contents:**
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12 {{toc/}}
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16 (% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||height="15" role="presentation" title="Click and drag to move" width="15"]]
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25
26
27 = 1.  Introduction =
28
29 == 1.1 ​ What is LTC2 LoRaWAN Temperature Transmitter ==
30
31 (((
32
33
34 (((
35 (((
36 The Dragino LTC2 Industrial LoRaWAN Temperature Transmitter is designed to monitor temperature for different environment. It supports to read (% style="color:#4472c4" %)**PT100 probe**(%%) and convert the value to temperature and uplink to IoT server via LoRaWAN protocol.
37 )))
38
39 (((
40 LTC2 supports (% style="color:#4472c4" %)**Datalog feature**(%%). User can retrieve the sensor value via LoRaWAN downlink command.
41 )))
42
43 (((
44 LTC2 is powered by (% style="color:#4472c4" %)**8500mA Li-SOCI2 battery**(%%) for long time measurement. The battery can run 2~~10 years depends on the network environment and working mode.
45 )))
46
47 (((
48 Each LTC2 has (% style="color:#4472c4" %)**two internal 24-bit ADC interfaces** (%%)and are calibrated on 12 set resistors to make sure the accuracy measurement on wide range.
49 )))
50
51 (((
52 LTC2 is LoRaWAN v1.0.3 compatible. Each LTC2 is pre-load with a set of unique keys for LoRaWAN registration, register these keys to local LoRaWAN server and it will auto connect after power on.
53 )))
54
55
56 [[image:image-20220617164020-3.png||height="450" width="1084"]]
57 )))
58
59
60 )))
61
62
63 == ​1.2  Features ==
64
65
66 * LoRaWAN v1.0.3 Class A
67 * max: 2 x monitor temperature channels
68 * Support 3 -wire PT-100
69 * 8500mAh Li-SOCI2 Battery
70 * Firmware upgrade via console
71 * Wall Mountable
72 * Configurable via LoRa or UART
73 * Datalog and retrieve via LoRaWAN
74 * Use pre-load PT100 probe or 3rd PT100 probe
75 * Factory calibration for different resistance range
76 * Support accuracy measure of resistance and upload
77 * Battery Monitoring and upload
78
79 (% style="display:none" %) ** **
80
81
82
83 == 1.3 ​ Applications ==
84
85 * Logistics and Supply Chain Management
86 * Food management
87 * Cold chains solution
88 * Industrial Monitoring and Control
89
90
91
92 == 1.4 Hardware Change log ==
93
94 LTC2 v1.0: Release.
95
96
97
98 == 1.5  Pin Definitions and Switch ==
99
100 === (% title="Click and drag to resize" %)1.5.1  J(%%)umper JP2 ( Power ON)(% 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" %)​(%%)​ ===
101
102 Put a jumper on JP2 will power on the LTC2.
103
104
105 === 1.5.2  LED ===
106
107 The LED will flash in below case.
108
109 1. Send an uplink packet
110
111
112
113 === 1.5.3  PT100 Interfaces ===
114
115 (((
116 There are two independent channels to connect 2 x PT100 probes.
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118
119 (((
120 Each channel has 3-wire connection for 3-wire PT100 probes.
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122
123
124 === 1.5.4  Reset Button ===
125
126 Press this button will reboot the LTC2
127
128
129 === 1.6  Probe Variant ===
130
131 LTC2 provide default probe version. See below for the variant:
132
133 (% border="1" cellspacing="10" style="background-color:#f7faff; width:505px" %)
134 |=(% style="width: 78px;" %)**Model**|=(% style="width: 117px;" %)**Photo**|=(% style="width: 314px;" %)**Description**
135 |(% style="width:78px" %)LTC2-SI|(% style="width:117px" %)[[image:1655458404877-785.png]]|(% style="width:314px" %)(((
136 Standard IP68 Probe Version
137
138 * LTC2 with 1 x Standard IP68 PT100 probe.
139 * Installation: Insert
140 * Cable Length : 2m
141 * PT100 Class : Class A
142 * Probe Dimension: 4*30mm
143 * Measure Range: -50 ~~ 200 °C
144 * Suitable Environment: General environment
145 )))
146 |(% style="width:78px" %)LTC2-LT|(% style="width:117px" %)[[image:image-20220617172838-2.png]]|(% style="width:314px" %)(((
147 Low Temperature Version
148
149 * LTC2 with 1 x Low Temperature PT100 probe.
150 * Installation: Insert
151 * Cable Length : 2m
152 * PT100 Class : Class A
153 * Probe Dimension: 4*30mm
154 * Measure Range: -196 ~~ 150 °C
155 * Suitable Environment: Low temperature measurement, such as COVID vaccine transport
156 )))
157 |(% style="width:78px" %)LTC2-FS|(% style="width:117px" %)[[image:image-20220617172838-3.png]]|(% style="width:314px" %)(((
158 Food Safety Version
159
160 * LTC2 with 1 x Food Safety PT100 probe.
161 * Installation: Insert
162 * Cable Length : 2m
163 * PT100 Class : Class A
164 * Probe Dimension: 4*150mm
165 * Measure Range: -50 ~~ 200 °C
166 * Suitable Environment: Food temperature measurement
167 )))
168 |(% style="width:78px" %)LTC2-FT|(% style="width:117px" %)(((
169 (% style="text-align:center" %)
170 [[image:image-20220617172838-4.png]]
171 )))|(% style="width:314px" %)(((
172 Flat Type Version
173
174 * LTC2 with 1 x Flat Type PT100 probe.
175 * Installation: Attached
176 * Cable Length : 2m
177 * PT100 Class : Class A
178 * Probe Dimension: 8*25mm
179 * Measure Range: -50 ~~ 200 °C
180 * Suitable Environment: Attached to the measure point.
181 )))
182 |(% style="width:78px" %)LTC2-HT|(% style="width:117px" %)[[image:image-20220617172838-5.png]]|(% style="width:314px" %)(((
183 High Temperature Version
184
185 * LTC2 with 1 x high temperature PT100 probe.
186 * Installation: Insert
187 * Cable Length : 3m
188 * PT100 Class : Class A
189 * Probe Dimension: 4*30mm
190 * Measure Range: -70 ~~ 550 °C
191
192 Suitable Environment: High Temperature
193 )))
194 |(% style="width:78px" %)LTC2-NA|(% style="width:117px" %)[[image:image-20220617172838-6.png]]|(% style="width:314px" %)(((
195 No Probe version:
196
197 * User can connect to their own PT100 Probe
198 * Grand Hole: M12
199 * Suitable Environment:
200
201 Connect to customized probe
202 )))
203
204
205
206 = 2.  How to use LTC2? =
207
208 == 2.1  Connect to PT100 sensors ==
209
210 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"]](%%).
211
212
213 === 2.2  How it works? ===
214
215 (((
216 (((
217 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**.
218 )))
219
220 (((
221 On each uplink, LTC2 will check its two ADC Interfaces and get the temperature from the sensor and send out to server.
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223 )))
224
225
226
227 == 2.3  ​Quick guide to connect to LoRaWAN server (OTAA) ==
228
229 (((
230 Here is an example for how to join the [[TTN v3 LoRaWAN >>url:https://eu1.cloud.thethings.network/]]Server. Below is the network structure, in this demo we use [[DLOS8>>url:https://www.dragino.com/products/lora-lorawan-gateway/item/140-lg308.html]] as LoRaWAN gateway.
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232 (% 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]]
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235 (% 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" %)​(%%)​
236
237 (((
238
239
240 === 2.3.1 Step 1: Create a device in TTN with the OTAA keys from LTC2 ===
241
242
243
244 Below is TTN screen shot:
245
246 * Create Application first.
247 * Manually Add a LoRaWAN End Device device. Choose **OTAA** and **MAC v1.0.3**
248
249 [[image:1655690861020-685.png]]
250
251
252 [[image:1655690877643-259.png]]
253
254
255 Input the OTAA keys for LTC2.
256
257 Each LTC2 is shipped with a sticker with the default device EUI as below:
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259 (% aria-label="image-20220607170145-1.jpeg image widget" contenteditable="false" role="region" tabindex="-1" %)[[image:image-20220607170145-1.jpeg||data-widget="image"]]
260
261
262 * **Input these keys to device portal.**
263
264 [[image:image-20220620100853-1.png]]
265
266
267
268 * **Choose the Frequency band for this end node.**
269
270 [[image:image-20220620100853-2.png]]
271
272
273 * **Input APP Key in this page as well. **
274
275 [[image:image-20220620100853-3.png]]
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277
278
279 Add payload formatter So TTNv3 knows how to parse the LTC2 upload value.
280
281
282 The payload for TTN can be found at below link:
283
284 [[https:~~/~~/www.dragino.com/downloads/downloads/LoRa_End_Node/LTC2/Decoder/>>https://www.dragino.com/downloads/downloads/LoRa_End_Node/LTC2/Decoder/]]
285
286
287 [[image:image-20220620100853-4.png]]
288
289
290
291
292 === 2.3.2  Step 2: Power on LTC2 ===
293
294
295 LTC2 is power off when ship from factory.
296
297 Put a Jumper on JP2 to power on the device.
298
299
300 [[image:1655691076464-442.png]]
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302
303
304 (((
305 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.
306 )))
307
308 (((
309 Below is an example uplink message which shows the LTC2 is sending Join Request to TTNv3.
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311
312
313 [[image:1655691086647-147.png]]
314
315
316 After join successful, LTC2 will send uplink message with the sensor value.
317
318 [[image:1655691100066-163.png]]
319
320 Above value shows Channel1 detect 25.94 degree. There is no PT100 connected on Channel 2, so it shows -327.67.
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322
323 )))
324
325
326 == 2.4  ​Uplink Payload ==
327
328 (((
329 (((
330 (((
331 Below is the uplink payload which shows
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336 (((
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338 )))
339
340 (% border="1" cellspacing="10" style="background-color:#ffffcc; width:510px" %)
341 |=(% style="width: 62.5px;" %)(((
342 **Size (bytes)**
343 )))|=(% style="width: 62.5px;" %)**2**|=**1**|=2|=2|=**4**
344 |(% style="width:62.5px" %)**Value**|(((
345 [[BAT>>||anchor="HBAT"]]
346
347
348 )))|(((
349 [[Status & EXT>>||anchor="HStatus26EXT"]]
350 )))|(((
351 [[Channel 1 data>>||anchor="HChannel1dataandChannel2data"]]
352 )))|(((
353 [[Channel 2 data>>||anchor="HChannel1dataandChannel2data"]]
354 )))|(((
355 [[Unix TimeStamp>>||anchor="HUnixTimeStamp"]]
356 )))
357
358 (% 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"]]
359
360
361 (((
362 === (% style="color:blue" %)**BAT**(%%) ===
363
364 (% class="wikigeneratedid" %)
365 Ex1: 0x0E3C ⇒ 3644 (mV) = 3.644 V
366
367 (% class="wikigeneratedid" %)
368
369 )))
370
371 (((
372 === (% style="color:blue" %)**Status & EXT**(%%) ===
373 )))
374
375 [[image:image-20220620103724-6.png]]
376
377 * (% style="color:#037691" %)**Poll Message Flag**(%%):  1: This message is a poll message reply, 0: means this is a normal uplink.
378 * (% 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.
379 * (% 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)
380 * (% style="color:#037691" %)**EXT**(%%):  The decode method for Channel 1 data and Channel 2 data
381 ** 0b(0001): Upload PT100 temperature, with 2 decimals, range:  **-327.67 ~~ 327.67 ℃**
382 ** 0b(0010): Upload PT100 temperature, with 1 decimals, range: ** -3276.7 ~~ 3276.7 ℃**
383 ** 0b(0011): Upload Resistance instead of Temperature, range:  **-327.67~~ 327.67 ohm**
384
385 (((
386 (% class="wikigeneratedid" %)
387
388
389
390 === (% style="color:blue" %)**Channel1 data and Channel 2 data**(%%) ===
391 )))
392
393 (((
394 (% class="wikigeneratedid" %)
395 [[image:image-20220620103651-5.png]]
396
397
398 === (% style="color:blue" %)**Unix TimeStamp**(%%) ===
399 )))
400
401 Refer to Datalog feature.
402
403 (% style="color:#037691" %)**Example Uplink Payload**:
404
405 **Uplink payload example 1:**  0CE9011422EC2D6073E83B
406
407 * Bat voltage:0x0CE9 =3305mV
408 * Ext=0x01
409 * Channel1 temp=0x1422/100=51.54 ℃
410 * Channel2 temp=(0xEC2D-65536)/100=-50.75 ℃
411 * System timestamp=0x6073E83B= 1618208827(UTC)
412
413 **Uplink payload example 2: ** 0CED020203FE056073E697
414
415 * Bat voltage:0x0CED =3309mV
416 * Ext=0x02
417 * Channel1 temp=0x0203/10=515.4 ℃
418 * Channel2 temp=(0xFE05-65536)/10=-507.5 ℃
419 * System timestamp=0x6073E697=1618208407(UTC)
420
421 **Uplink payload example 3 :**  0CE9032EDE1F406073E967
422
423 * Bat voltage:0x0CE9 =3305mV
424 * Ext=0x03
425 * Channel1 res=0x2EDE/100=119.98 ohm
426 * Channel2 res=0x1F40/100=80.00 ohm
427 * System timestamp=0x6073E967= 1618209127(UTC)
428
429 (% 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" %)​(%%)​
430
431
432 == 2.5  Datalog Feature ==
433
434 LTC2 will auto get the time from LoRaWAN server during Join, and each uplink will then include a timestamp. When user want to retrieve sensor value, user can send a poll command from the IoT platform to ask sensor to send value in the required time slot.
435
436
437 === 2.5.1  Unix TimeStamp ===
438
439
440 LTC2 uses Unix TimeStamp format based on
441
442 [[image:1655694312268-590.png]]
443
444 Users can get this time from the link:  [[https:~~/~~/www.epochconverter.com/>>url:https://www.epochconverter.com/]] :
445
446 Below is the converter example
447
448 [[image:1655694332878-202.png]]
449
450
451 (((
452 So, we can use AT+TIMESTAMP=1611889405 or downlink 3060137afd00 to set current time 2021 – Jan ~-~- 29 Friday 03:03:25
453 )))
454
455
456 === 2.5.2  Set Device Time ===
457
458 (((
459 (((
460 There are two ways to set the device's time:
461 )))
462 )))
463
464 (((
465 (((
466 (% style="color:#4f81bd" %)**1. Through LoRaWAN MAC Command (Default settings)**
467 )))
468 )))
469
470 (((
471 (((
472 Users need to set SYNCMOD=1 to enable sync time via the MAC command.
473 )))
474 )))
475
476 (((
477 Once LTC2 Joined LoRaWAN network, it will send the MAC command (DeviceTimeReq) and server will reply with (DeviceTimeAns) to send the current time to LTC2. If LTC2 fails to get the time from server, LTC2 will use the internal time and wait for next time request (AT+SYNCTDC to set time request period, default is 10 days).
478
479
480 )))
481
482 (((
483 (((
484 (% style="color:red" %)**Note**(%%): (% style="color:#4f81bd" %)LoRaWAN Server needs to support LoRaWAN v1.0.3(MAC v1.0.3) (%%)or higher to support this MAC command feature, Chirpstack,TTN v3 and loriot support but TTN v2 doesn't support. If server doesn't support this command, it will through away uplink packet with this command, so user will lose the packet with time request for TTN v2 if SYNCMOD=1.
485
486
487 )))
488
489 (((
490 (% style="color:#4f81bd" %)**2. Manually Set Time**
491 )))
492
493 (((
494 Users need to set SYNCMOD=0 to manual time, otherwise, the user set time will be overwritten by the time set by the server.
495 )))
496 )))
497
498
499
500 === 2.5.3  Poll sensor value ===
501
502 Users can poll sensor values based on timestamps. Below is the downlink command.
503
504 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:453.989px" %)
505 |=(% colspan="4" style="width: 451px;" %)**Downlink Command to poll Open/Close status (0x31)**
506 |(% style="width:59px" %)**1byte**|(% style="width:126px" %)**4bytes**|(% style="width:138px" %)**4bytes**|(% style="width:128px" %)**1byte**
507 |(% style="width:59px" %)31|(% style="width:126px" %)Timestamp start|(% style="width:138px" %)Timestamp end|(% style="width:128px" %)Uplink Interval
508
509 (((
510
511 )))
512
513 (((
514 Timestamp start and Timestamp end use Unix TimeStamp format as mentioned above. Devices will reply with all data log during this time period, use the uplink interval.
515
516 For example, downlink command[[image:image-20220620111056-7.png]]
517 )))
518
519 (((
520 Is to check 2021/5/16 01:00:00 to 2021/5/16 02:00:00's data
521
522 Uplink Internal =10s，means LTC2 will send one packet every 10s. range 5~~255s.
523 )))
524
525
526
527 === 2.5.4  Datalog Uplink payload ===
528
529 When server senser a datalog polling to LTC2, LTC2 will reply with one or more uplink messages as reply. Each uplink message includes multiply data entries value. Each entry has the same payload format as[[ normal uplink payload>>||anchor="H2.4A0200BUplinkPayload"]].
530
531
532 (% style="color:red" %)**Note:**
533
534 * Poll Message Flag is set to 1.
535 * Each data entry is 11 bytes, to save airtime and battery, devices will send max bytes according to the current DR and Frequency bands.
536
537 For example, in US915 band, the max payload for different DR is:
538
539 1. DR0: max is 11 bytes so one entry of data
540 1. DR1: max is 53 bytes so devices will upload 4 entries of data (total 44 bytes)
541 1. DR2: total payload includes 11 entries of data
542 1. DR3: total payload includes 22 entries of data.
543
544 If devise doesn't have any data in the polling time. Device will uplink 11 bytes of 0   
545
546
547 **Example:**
548
549 If LTC2 has below data inside Flash:
550
551 [[image:image-20220620134635-9.png]]
552
553
554 If user send below downlink command:
555
556 **3160A06E9060A098C00A**
557
558 Where : Start time: 60A06E90 = time 21/5/16 01:00:00
559
560 Stop time: 60A098C0 = time 21/5/16 04:00:00
561
562
563 LTC2 will uplink this payload.
564
565
566 [[image:image-20220620111850-8.png]]
567
568 (% style="color:red" %)**0E64410B49800160A072B8**(%%)0E61410B3F800160A077680E61410B33800160A07C180E64410B2C800160A080C80E64410B28800160A085780E64410B24800160A08A280E64410B23800160A08ED80E64410B22800160A09388(% style="color:red" %)**0E64410B1E800160A09838**
569
570
571 Where the first 11 bytes is for the first entry:
572
573 (% style="color:red" %)**0E64410B49800160A072B8**
574
575 Bat voltage:0x0E64 =3684mV
576
577
578 poll message flag & Ext=0x41,means reply data,Ext=1
579
580 Channel1 temp=0x0B49/100=28.89℃
581
582 Channel2 temp=0x8001/100=-327.67℃
583
584 System timestamp=0x60A072B8= 1621127864(UTC)
585
586
587
588 == 2.6  ​Alarm Mode ==
589
590 (((
591 LTC2 can monito the temperature in every CTTEMP time, when the temperature exceed the limit , it will uplink the sensor value immediately.
592
593 Detail commands see:
594
595 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Enable Alarm Mode**>>||anchor="H3.9EnableAlarmmode"]]
596 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Config Alarm Sampling Time**>>||anchor="H3.10Alarmchecktime"]]
597 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Set Alarm Threshold**>>||anchor="H3.11SetAlarmThreshold"]]
598
599
600 )))
601
602
603 = 3.  Configure LTC2 via AT Command or LoRaWAN Downlink =
604
605 (((
606 (((
607 Use can configure LTC2 via AT Command or LoRaWAN Downlink.
608 )))
609 )))
610
611 * (((
612 (((
613 AT Command Connection: See [[FAQ>>||anchor="H6.A0FAQ"]].
614 )))
615 )))
616 * (((
617 (((
618 LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]]
619 )))
620 )))
621
622 (((
623 (((
624
625 )))
626
627 (((
628 There are two kinds of commands to configure LTC2, they are:
629 )))
630 )))
631
632 * (((
633 (((
634 (% style="color:#4f81bd" %)** General Commands**.
635 )))
636 )))
637
638 (((
639 (((
640 These commands are to configure:
641 )))
642 )))
643
644 * (((
645 (((
646 General system settings like: uplink interval.
647 )))
648 )))
649 * (((
650 (((
651 LoRaWAN protocol & radio related command.
652 )))
653 )))
654
655 (((
656 (((
657 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]]
658 )))
659 )))
660
661 (((
662 (((
663
664 )))
665 )))
666
667 * (((
668 (((
669 (% style="color:#4f81bd" %)** Commands special design for LTC2**
670 )))
671 )))
672
673 (((
674 (((
675 These commands only valid for LTC2, as below:(% title="Click and drag to resize" %)​
676 )))
677 )))
678
679 (% 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" %)​
680
681
682
683 == 3.1  Set Transmit Interval Time ==
684
685 Feature: Change LoRaWAN End Node Transmit Interval.
686
687 (% style="color:#037691" %)**AT Command: AT+TDC**
688
689 (% aria-label="image-20220610173409-7.png image widget" contenteditable="false" role="region" tabindex="-1" %)[[image:image-20220610173409-7.png||data-widget="image"]](% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)​(%%)​
690
691
692 (((
693 (% style="color:#037691" %)**Downlink Command: 0x01**
694 )))
695
696 (((
697 (((
698 Format: Command Code (0x01) followed by 3 bytes time value.
699
700 (((
701 If the downlink payload=0100003C, it means set the END Node's Transmit Interval to 0x00003C=60(S), while type code is 01.
702 )))
703
704 * Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
705 * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
706 )))
707 )))
708
709
710
711
712 == 3.2  Enable PT100 channels ==
713
714 Feature: Enable PT100 channels. Default only Enable Channel 1
715
716 (% style="color:#037691" %)**AT Command: AT+ENPTCHNUM**
717
718 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:494px" %)
719 |=(% style="width: 165px;" %)**Command Example**|=(% style="width: 254px;" %)**Function**|=(% style="width: 73px;" %)**Response**
720 |(% style="width:165px" %)AT+ENPTCHNUM=?|(% style="width:254px" %)Get current ENPTCHNUM settings|(% style="width:73px" %)(((
721 1
722
723 OK
724 )))
725 |(% style="width:165px" %)AT+ ENPTCHNUM =1|(% colspan="2" style="width:327px" %)Enable channel 1
726 |(% style="width:165px" %)AT+ ENPTCHNUM =2|(% colspan="2" style="width:327px" %)Enable channel 1 and 2
727
728 (% style="color:#037691" %)**Downlink Command: 0xA1**
729
730 Total bytes: 2 bytes
731
732 Example:
733
734 * 0xA101: same as AT+ENPTCHNUM =1
735 * 0xA102: same as AT+ENPTCHNUM =2
736
737
738
739 == 3.3  Set External Sensor Mode ==
740
741 (((
742 Feature: Change External Sensor Mode.
743 )))
744
745 (((
746 (% style="color:#037691" %)**Downlink Command: AT+EXT**
747 )))
748
749 (% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" tabindex="-1" %)​(%%)​
750
751 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:428px" %)
752 |=(% style="width: 155px;" %)**Command Example**|=(% style="width: 180px;" %)**Function**|=(% style="width: 90px;" %)**Response**
753 |(% style="width:155px" %)AT+EXT=?|(% style="width:180px" %)Get current EXT settings|(% style="width:90px" %)(((
754 1
755
756 OK
757 )))
758 |(% style="width:155px" %)AT+EXT=1|(% colspan="2" style="width:270px" %)Set EXT to 0b(0001)
759 |(% style="width:155px" %)AT+EXT=2|(% colspan="2" style="width:270px" %)Set EXT to 0b(0010)
760 |(% style="width:155px" %)AT+EXT=3|(% colspan="2" style="width:270px" %)Set EXT to 0b(0011)
761
762 (% style="color:#037691" %)**Downlink Command: 0xA2**
763
764 Total bytes: 2 bytes
765
766 Example:
767
768 * 0xA201: same as AT+EXT=1
769
770
771
772 == 3.4 Quit AT Command ==
773
774 Feature: Quit AT Command mode, so user need to input password again before use AT Commands.
775
776 (% style="color:#037691" %)**AT Command: AT+DISAT**
777
778 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:446px" %)
779 |=(% style="width: 161px;" %)**Command Example**|=(% style="width: 193px;" %)**Function**|=(% style="width: 87px;" %)**Response**
780 |(% style="width:161px" %)AT+DISAT|(% style="width:193px" %)Quit AT Commands mode|(% style="width:87px" %)OK
781
782 (% style="color:#037691" %)**Downlink Command:**
783
784 No downlink command for this feature.
785
786
787
788 == 3.5 Set system time ==
789
790 Feature: Set system time, unix format. [[See here for formmat detail.>>||anchor="H2.5.1A0UnixTimeStamp"]]
791
792 (% style="color:#037691" %)**AT Command:**
793
794 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:506px" %)
795 |=(% style="width: 218px;" %)**Command Example**|=(% style="width: 285px;" %)**Function**
796 |(% style="width:218px" %)AT+TIMESTAMP=1611104352|(% style="width:285px" %)(((
797 OK
798
799 Set System time to 2021-01-20 00:59:12
800 )))
801
802 (% style="color:#037691" %)**Downlink Command:**
803
804 0x306007806000  ~/~/ Set timestamp to 0x(6007806000),Same as AT+TIMESTAMP=1611104352
805
806
807
808 == 3.6 Set Time Sync Mode ==
809
810 Feature: Enable/Disable Sync system time via LoRaWAN MAC Command (DeviceTimeReq), LoRaWAN server must support v1.0.3 protocol to reply this command.
811
812
813 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.
814
815
816 (% style="color:#037691" %)**AT Command:**
817
818 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:473px" %)
819 |=(% style="width: 157px;" %)**Command Example**|=(% style="width: 313px;" %)**Function**
820 |(% style="width:157px" %)AT+SYNCMOD=1|(% style="width:313px" %)Enable Sync system time via LoRaWAN MAC Command (DeviceTimeReq)
821
822 (% style="color:#037691" %)**Downlink Command:**
823
824 0x28 01 ~/~/ Same As AT+SYNCMOD=1
825
826 0x28 00 ~/~/ Same As AT+SYNCMOD=0
827
828
829
830 == 3.7 Set Time Sync Interval ==
831
832 Feature: Define System time sync interval. SYNCTDC default value: 10 days.
833
834 (% style="color:#037691" %)**AT Command:**
835
836 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:469px" %)
837 |=**Command Example**|=(% style="width: 306px;" %)**Function**
838 |AT+SYNCTDC=0x0A|(% style="width:306px" %)Set SYNCTDC to 10 (0x0A), so the sync time is 10 days.
839
840 (% style="color:#037691" %)**Downlink Command:**
841
842 0x29 0A ~/~/ Same as AT+SYNCTDC=0x0A
843
844
845
846 == 3.8 Retrieve data ==
847
848 Feature: Retrieval data for specify time slot.
849
850 (% style="color:#037691" %)**AT Command**(%%)**:**
851
852 No AT Command, only valid for downlink command.
853
854
855 (% style="color:#037691" %)**Downlink Command:**
856
857 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
858
859
860
861 == 3.9 Enable Alarm mode ==
862
863 Feature: Enable Alarm Mode.
864
865 (% style="color:#037691" %)**AT Command: AT_WMOD**
866
867 Total bytes: 2
868
869 Example:
870
871 0xA500: AT+WMOD=0(default)
872
873 0xA501: AT+WMOD=1(alarm mode)
874
875
876 (% style="color:#037691" %)**Downlink Command:**
877
878 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
879
880
881
882 == 3.10 Alarm check time ==
883
884 Feature: The time interval to check sensor value for Alarm.
885
886 (% style="color:#037691" %)**AT Command: AT+CITEMP**
887
888 Total bytes: 3
889
890 Example:
891
892 0xA60001: AT+CITEMP=1(default)
893
894 Set collection interval in 1min,only in alarm mode
895
896
897 (% style="color:#037691" %)**Downlink Command:**
898
899 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
900
901
902
903 == 3.11 Set Alarm Threshold ==
904
905 Feature: Set Alarm Threshold.
906
907 (% style="color:#037691" %)**AT Command: AT+ARTEMP**
908
909 Total bytes: 9  Unit: ℃
910
911 Example:
912
913 A7FF380320FF380320
914
915 AT+ARTEMP=-200,800,-200,800
916
917
918 A7000A0064000A0065
919
920 AT+ARTEMP=10,100,10,101
921
922 Channel 1 operating temp:10~~100
923
924 Channel 2 operating temp:10~~101
925
926
927 (% style="color:#037691" %)**Downlink Command:**
928
929 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
930
931
932
933 == 3.12 Set Calibrate Value ==
934
935 Feature: Set Calibrate value for PT100 cable.  Detail of use of this command please see [[connect to a customized PT100 Probe>>||anchor="H6.2A0HowtoconnectacustomizedPT100cable3F"]].
936
937 (% style="color:#037691" %)**AT Command: AT+RCABLE**
938
939 Total bytes: 5
940
941 Example:
942
943 AT+RCABLE=296,300
944
945 Channel 1 rcable=0x0128/1000=0.296R
946
947 Channel 2 rcable=0x012C/1000=0.300R
948
949
950 (% style="color:#037691" %)**Downlink Command:**
951
952 0xA80128012C  ~-~->  Same as AT+RCABLE=296,300
953
954
955
956 == 3.13 Poll Calibrate Value ==
957
958 Feature: Poll Calibrate value. LTC2 will reply with this command send an uplink to server.
959
960 (% style="color:#037691" %)**AT Command: No AT Command.**
961
962
963 (% style="color:#037691" %)**Downlink Command:**
964
965 Example: A901
966
967 End nodes will send racable config to server
968
969 Like uplink payload: 010128012C
970
971
972
973 == 3.14 Print data entries base on page ==
974
975 Feature: Print the sector data from start page to stop page (max is 400 pages).
976
977 (% style="color:#037691" %)**AT Command: AT+PDTA**
978
979 [[image:image-20220620145822-10.png]]
980
981
982 (% style="color:#037691" %)**Downlink Command:**
983
984 No downlink commands for feature
985
986
987
988 == 3.15 Print last few data entries ==
989
990 Feature: Print the last few data entries
991
992 (% style="color:#037691" %)**AT Command: AT+PLDTA**
993
994 [[image:image-20220620145916-11.png]]
995
996
997 (% style="color:#037691" %)**Downlink Command:**
998
999 No downlink commands for feature
1000
1001
1002
1003 == 3.16 Clear Flash Record ==
1004
1005 Feature: Clear flash storage for data log feature.
1006
1007 (% style="color:#037691" %)**AT Command: AT+CLRDTA**
1008
1009 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:511px" %)
1010 |=(% style="width: 157px;" %)**Command Example**|=(% style="width: 136px;" %)**Function**|=(% style="width: 213px;" %)**Response**
1011 |(% style="width:157px" %)AT+CLRDTA|(% style="width:136px" %)Clear date record|(% style="width:213px" %)(((
1012 Clear all stored sensor data…
1013
1014 OK
1015 )))
1016
1017 (% style="color:#037691" %)**Downlink Command: 0xA3**
1018
1019 * Example: 0xA301 ~/~/Same as AT+CLRDTA
1020
1021
1022
1023 = 4.  Battery & How to replace =
1024
1025 == 4.1  Battery Type ==
1026
1027 (((
1028 LTC2 is equipped with a [[8500mAH ER26500 Li-SOCI2 battery>>url:https://www.dragino.com/downloads/index.php?dir=datasheet/Battery/ER26500/]]. The battery is un-rechargeable battery with low discharge rate targeting for 8~~10 years use. This type of battery is commonly used in IoT target for long-term running, such as water meter.
1029 )))
1030
1031 (((
1032 The discharge curve is not linear so can't simply use percentage to show the battery level. Below is the battery performance.
1033 )))
1034
1035 (% aria-label="1654593587246-335.png image widget" contenteditable="false" role="region" tabindex="-1" %)[[image:1654593587246-335.png||data-widget="image"]](% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none; left:0px; top:-15px" 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:url(~"http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png~") rgba(220, 220, 220, 0.5); left:0px; top:-15px" tabindex="-1" %)​(%%)​
1036
1037
1038 Minimum Working Voltage for the LTC2:
1039
1040 LTC2:  3.0v ~~ 3.6v
1041
1042
1043
1044 == 4.2  Replace Battery ==
1045
1046 (((
1047
1048
1049 (((
1050 Any battery with 3.6v can be a replacement. We recommend to use Li-SOCl2 Battery.
1051 )))
1052 )))
1053
1054 (((
1055 (((
1056 And make sure the positive and negative pins match.
1057 )))
1058 )))
1059
1060
1061
1062 == 4.3  Power Consumption Analyze ==
1063
1064 (((
1065 Dragino Battery powered product are all runs in Low Power mode. We have an update battery calculator which base on the measurement of the real device. User can use this calculator to check the battery life and calculate the battery life if want to use different transmit interval.
1066 )))
1067
1068 (((
1069 Instruction to use as below:
1070 )))
1071
1072
1073 **Step 1 :**  Downlink the up-to-date DRAGINO_Battery_Life_Prediction_Table.xlsx from:
1074
1075 [[https:~~/~~/www.dragino.com/downloads/index.pHp?dir=LoRa_End_Node/Battery_Analyze/>>url:https://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/Battery_Analyze/]]
1076
1077
1078 **Step 2 :**  Open it and choose
1079
1080 * Product Model
1081 * Uplink Interval
1082 * Working Mode
1083
1084 And the Life expectation in difference case will be shown on the right.
1085
1086 (% aria-label="1654593605679-189.png image widget" contenteditable="false" role="region" tabindex="-1" %)[[image:1654593605679-189.png||data-widget="image"]](% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]](% title="Click and drag to resize" %)​(% aria-label="Data URI image image widget" contenteditable="false" role="region" style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220, 220, 220, 0.5); display:none" tabindex="-1" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||data-widget="image" draggable="true" height="15" role="presentation" title="Click and drag to move" width="15"]][[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; left:0px; top:-15px" 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:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png) rgba(220, 220, 220, 0.5); left:0px; top:-15px" 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; left:0px; top:-15px" 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:url(~"http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png~") rgba(220, 220, 220, 0.5); left:0px; top:-15px" tabindex="-1" %)​(%%)​
1087
1088
1089
1090 = 5.  Firmware Change Log and Upload Firmware(% style="display:none" %) (%%) =
1091
1092 (((
1093 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:
1094 )))
1095
1096 (((
1097
1098 )))
1099
1100 (((
1101 **Connection:**
1102 )))
1103
1104 * (((
1105 (% style="background-color:yellow" %)**ST-LINK v2 GND  <~-~->  LTC2 GND**
1106 )))
1107 * (((
1108 (% style="background-color:yellow" %)**ST-LINK v2 RESET  <~-~->  LTC2 NRST**
1109 )))
1110 * (((
1111 (% style="background-color:yellow" %)**ST-LINK v2 SWCLK  <~-~->  LTC2 SWCLK**
1112 )))
1113 * (((
1114 (% style="background-color:yellow" %)**ST-LINK v2 SWDIO  <~-~->  LTC2 SWDIO**
1115 )))
1116 * (((
1117 (% style="background-color:yellow" %)**LTC2 power must be on.  **
1118 )))
1119
1120 (((
1121
1122
1123 **Firmware Location and Change Log:**
1124 )))
1125
1126 (((
1127 [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LTC2/Firmware/>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_End_Node/LTC2/Firmware/]]
1128 )))
1129
1130
1131
1132 = 6.  FAQ =
1133
1134 == 6.1  How to use AT Command to configure LTC2 ==
1135
1136 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.
1137
1138
1139 **Connection:**
1140
1141 * (% style="background-color:yellow" %)**USB to TTL GND <~-~->  LTC2 GND**
1142 * (% style="background-color:yellow" %)**USB to TTL RXD  <~-~->  LTC2 TXD**
1143 * (% style="background-color:yellow" %)**USB to TTL TXD  <~-~->  LTC2 RXD**
1144
1145 (((
1146 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.
1147 )))
1148
1149 (((
1150
1151 )))
1152
1153 (((
1154 Input password and ATZ to activate LTC2,As shown below:
1155 )))
1156
1157 [[image:image-20220620151601-13.png||height="454" width="1204"]]
1158
1159
1160
1161
1162 == 6.2  How to connect a customized PT100 cable? ==
1163
1164 (((
1165 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. 
1166 )))
1167
1168 (((
1169
1170 )))
1171
1172 (((
1173 (% 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.
1174 )))
1175
1176 [[image:image-20220620152115-14.jpeg||height="548" width="763"]]
1177
1178 We know that the Multimeter has a shortcut resistance 0.002 ohm.
1179
1180
1181 (% style="color:blue" %)**Step 2**(%%): Measure the resistance between the two shorted wires of PT100 Probe.
1182
1183 [[image:image-20220620152115-15.jpeg||height="791" width="704"]]
1184
1185 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) .
1186
1187
1188 (% style="color:blue" %)**Step 3**(%%): Run Calibrate Command.
1189
1190 Run this command to both channels to use 0.296R calibrate resistance.
1191
1192 **AT+RCABLE=296,0**   ~-~->  Calibrate Channel 1 with 0.296R
1193
1194
1195 Or use LoRaWAN downlink command (0xA8 Code) to set:
1196
1197 0xA801280000
1198
1199
1200 User can use 0xA9 downlink command to poll the current calibration value.
1201
1202
1203 (% style="color:blue" %)**Step 4**(%%)**: Connect the PT100 to LTC2**
1204
1205 [[image:image-20220620152115-16.png]]
1206
1207 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.
1208
1209
1210
1211 == 6.3  What is the frequency range of LTC2 LoRa part? ==
1212
1213 Different LTC2 version supports different frequency range, below is the table for the working frequency and recommend bands for each model:
1214
1215 [[image:image-20220620151440-12.png]]
1216
1217
1218
1219 == 6.4  How to change the LoRa Frequency Bands/Region ==
1220
1221 You can follow the instructions for [[how to upgrade image>>||anchor="H5.A0FirmwareChangeLogandUploadFirmware"]].
1222 When downloading the images, choose the required image file for download. ​
1223
1224
1225
1226 = 7.  Trouble Shooting =
1227
1228 == 7.1  AT Command input doesn't work ==
1229
1230 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.
1231
1232 (((
1233
1234 )))
1235
1236
1237 = 8.  Order Info =
1238
1239 Part Number **:** (% style="color:blue" %)**LTC2-XX-YYY**
1240
1241 (% style="color:#0000ff" %)**XX**(%%)**: **Probe Version
1242
1243 * (% style="color:red" %)**SI**(%%): Standard IP68 probe x 1
1244 * (% style="color:red" %)**LT**(%%): Low Temperature probe x 1
1245 * (% style="color:red" %)**HT**(%%): High Temperature probe x 1
1246 * (% style="color:red" %)**FS**(%%): Food Safety probe x 1
1247 * (% style="color:red" %)**FT**(%%): Flat Type probe x 1
1248 * (% style="color:red" %)**NA**(%%): No probe
1249
1250 (% style="color:#0000ff" %)**YYY**(%%)**: **The default frequency band
1251
1252 * (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band
1253 * (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band
1254 * (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band
1255 * (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band
1256 * (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band
1257 * (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band
1258 * (% style="color:red" %)**IN865 **(%%)**:**  LoRaWAN IN865 band
1259 * (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band
1260
1261
1262 = 9. ​ Packing Info =
1263
1264
1265 **Package Includes**:
1266
1267 * LTC2 LoRaWAN Temperature Transmitter x 1
1268
1269 **Dimension and weight**:
1270
1271 * Device Size: cm
1272 * Device Weight: g
1273 * Package Size / pcs : cm
1274 * Weight / pcs : g
1275
1276
1277 = 10.  ​Support =
1278
1279 * 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.
1280 * 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]].

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