Version 280.8 by Xiaoling on 2022/07/01 16:05
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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:**
11
12 {{toc/}}
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16 (% style="background-image:url(http://wiki1.dragino.com/xwiki/webjars/wiki%3Axwiki/application-ckeditor-webjar/1.61/plugins/widget/images/handle.png); background:rgba(220,220,220,0.5); display:none" %)[[image:data:image/gif;base64,R0lGODlhAQABAPABAP///wAAACH5BAEKAAAALAAAAAABAAEAAAICRAEAOw==||height="15" role="presentation" title="Click and drag to move" width="15"]]
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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 == 1.4 Hardware Change log ==
91
92 LTC2 v1.0: Release.
93
94
95
96 == 1.5  Pin Definitions and Switch ==
97
98 === (% title="Click and drag to resize" %)1.5.1  J(%%)umper JP2 ( Power ON)(% 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" %)​(%%)​ ===
99
100 Put a jumper on JP2 will power on the LTC2.
101
102
103 === 1.5.2  LED ===
104
105 The LED will flash in below case.
106
107 1. Send an uplink packet
108
109
110
111 === 1.5.3  PT100 Interfaces ===
112
113 (((
114 There are two independent channels to connect 2 x PT100 probes.
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116
117 (((
118 Each channel has 3-wire connection for 3-wire PT100 probes.
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120
121
122 === 1.5.4  Reset Button ===
123
124 Press this button will reboot the LTC2
125
126
127 === 1.6  Probe Variant ===
128
129 LTC2 provide default probe version. See below for the variant:
130
131 (% border="1" cellspacing="10" style="background-color:#f7faff; width:505px" %)
132 |=(% style="width: 78px;" %)**Model**|=(% style="width: 117px;" %)**Photo**|=(% style="width: 314px;" %)**Description**
133 |(% style="width:78px" %)LTC2-SI|(% style="width:117px" %)[[image:1655458404877-785.png]]|(% style="width:314px" %)(((
134 Standard IP68 Probe Version
135
136 * LTC2 with 1 x Standard IP68 PT100 probe.
137 * Installation: Insert
138 * Cable Length : 2m
139 * PT100 Class : Class A
140 * Probe Dimension: 4*30mm
141 * Measure Range: -50 ~~ 200 °C
142 * Suitable Environment: General environment
143 )))
144 |(% style="width:78px" %)LTC2-LT|(% style="width:117px" %)[[image:image-20220617172838-2.png]]|(% style="width:314px" %)(((
145 Low Temperature Version
146
147 * LTC2 with 1 x Low Temperature PT100 probe.
148 * Installation: Insert
149 * Cable Length : 2m
150 * PT100 Class : Class A
151 * Probe Dimension: 4*30mm
152 * Measure Range: -196 ~~ 150 °C
153 * Suitable Environment: Low temperature measurement, such as COVID vaccine transport
154 )))
155 |(% style="width:78px" %)LTC2-FS|(% style="width:117px" %)[[image:image-20220617172838-3.png]]|(% style="width:314px" %)(((
156 Food Safety Version
157
158 * LTC2 with 1 x Food Safety PT100 probe.
159 * Installation: Insert
160 * Cable Length : 2m
161 * PT100 Class : Class A
162 * Probe Dimension: 4*150mm
163 * Measure Range: -50 ~~ 200 °C
164 * Suitable Environment: Food temperature measurement
165 )))
166 |(% style="width:78px" %)LTC2-FT|(% style="width:117px" %)(((
167 (% style="text-align:center" %)
168 [[image:image-20220617172838-4.png]]
169 )))|(% style="width:314px" %)(((
170 Flat Type Version
171
172 * LTC2 with 1 x Flat Type PT100 probe.
173 * Installation: Attached
174 * Cable Length : 2m
175 * PT100 Class : Class A
176 * Probe Dimension: 8*25mm
177 * Measure Range: -50 ~~ 200 °C
178 * Suitable Environment: Attached to the measure point.
179 )))
180 |(% style="width:78px" %)LTC2-HT|(% style="width:117px" %)[[image:image-20220617172838-5.png]]|(% style="width:314px" %)(((
181 High Temperature Version
182
183 * LTC2 with 1 x high temperature PT100 probe.
184 * Installation: Insert
185 * Cable Length : 3m
186 * PT100 Class : Class A
187 * Probe Dimension: 4*30mm
188 * Measure Range: -70 ~~ 550 °C
189
190 Suitable Environment: High Temperature
191 )))
192 |(% style="width:78px" %)LTC2-NA|(% style="width:117px" %)[[image:image-20220617172838-6.png]]|(% style="width:314px" %)(((
193 No Probe version:
194
195 * User can connect to their own PT100 Probe
196 * Grand Hole: M12
197 * Suitable Environment:
198
199 Connect to customized probe
200 )))
201
202
203
204 = 2.  How to use LTC2? =
205
206 == 2.1  Connect to PT100 sensors ==
207
208 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"]](%%).
209
210
211 === 2.2  How it works? ===
212
213 (((
214 (((
215 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**.
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218 (((
219 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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221 )))
222
223
224
225 == 2.3  ​Quick guide to connect to LoRaWAN server (OTAA) ==
226
227 (((
228 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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230 (% 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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232
233 (% 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" %)​(%%)​
234
235 (((
236
237
238 === 2.3.1 Step 1: Create a device in TTN with the OTAA keys from LTC2 ===
239
240
241
242 Below is TTN screen shot:
243
244 * Create Application first.
245 * Manually Add a LoRaWAN End Device device. Choose **OTAA** and **MAC v1.0.3**
246
247 [[image:1655690861020-685.png]]
248
249
250 [[image:1655690877643-259.png]]
251
252
253 Input the OTAA keys for LTC2.
254
255 Each LTC2 is shipped with a sticker with the default device EUI as below:
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257 (% aria-label="image-20220607170145-1.jpeg image widget" contenteditable="false" role="region" tabindex="-1" %)[[image:image-20220607170145-1.jpeg||data-widget="image"]]
258
259
260 * **Input these keys to device portal.**
261
262 [[image:image-20220620100853-1.png]]
263
264
265
266 * **Choose the Frequency band for this end node.**
267
268 [[image:image-20220620100853-2.png]]
269
270
271 * **Input APP Key in this page as well. **
272
273 [[image:image-20220620100853-3.png]]
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275
276
277 Add payload formatter So TTNv3 knows how to parse the LTC2 upload value.
278
279
280 The payload for TTN can be found at below link:
281
282 [[https:~~/~~/www.dragino.com/downloads/downloads/LoRa_End_Node/LTC2/Decoder/>>https://www.dragino.com/downloads/downloads/LoRa_End_Node/LTC2/Decoder/]]
283
284
285 [[image:image-20220620100853-4.png]]
286
287
288
289
290 === 2.3.2  Step 2: Power on LTC2 ===
291
292
293 LTC2 is power off when ship from factory.
294
295 Put a Jumper on JP2 to power on the device.
296
297
298 [[image:1655691076464-442.png]]
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300
301
302 (((
303 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.
304 )))
305
306 (((
307 Below is an example uplink message which shows the LTC2 is sending Join Request to TTNv3.
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309
310
311 [[image:1655691086647-147.png]]
312
313
314 After join successful, LTC2 will send uplink message with the sensor value.
315
316 [[image:1655691100066-163.png]]
317
318 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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320
321 )))
322
323
324 == 2.4  ​Uplink Payload ==
325
326 (((
327 (((
328 (((
329 Below is the uplink payload which shows
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334 (((
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336 )))
337
338 (% border="1" cellspacing="10" style="background-color:#ffffcc; width:510px" %)
339 |=(% style="width: 62.5px;" %)(((
340 **Size (bytes)**
341 )))|=(% style="width: 62.5px;" %)**2**|=**1**|=2|=2|=**4**
342 |(% style="width:62.5px" %)**Value**|(((
343 [[BAT>>||anchor="HBAT"]]
344
345
346 )))|(((
347 [[Status & EXT>>||anchor="HStatus26EXT"]]
348 )))|(((
349 [[Channel 1 data>>||anchor="HChannel1dataandChannel2data"]]
350 )))|(((
351 [[Channel 2 data>>||anchor="HChannel1dataandChannel2data"]]
352 )))|(((
353 [[Unix TimeStamp>>||anchor="HUnixTimeStamp"]]
354 )))
355
356 (% 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"]]
357
358
359 (((
360 === (% style="color:blue" %)**BAT**(%%) ===
361
362 (% class="wikigeneratedid" %)
363 Ex1: 0x0E3C ⇒ 3644 (mV) = 3.644 V
364
365 (% class="wikigeneratedid" %)
366
367 )))
368
369 (((
370 === (% style="color:blue" %)**Status & EXT**(%%) ===
371 )))
372
373 [[image:image-20220620103724-6.png]]
374
375 * (% style="color:#037691" %)**Poll Message Flag**(%%):  1: This message is a poll message reply, 0: means this is a normal uplink.
376 * (% 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.
377 * (% 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)
378 * (% style="color:#037691" %)**EXT**(%%):  The decode method for Channel 1 data and Channel 2 data
379 ** 0b(0001): Upload PT100 temperature, with 2 decimals, range:  **-327.67 ~~ 327.67 ℃**
380 ** 0b(0010): Upload PT100 temperature, with 1 decimals, range: ** -3276.7 ~~ 3276.7 ℃**
381 ** 0b(0011): Upload Resistance instead of Temperature, range:  **-327.67~~ 327.67 ohm**
382
383 (((
384 (% class="wikigeneratedid" %)
385
386
387
388 === (% style="color:blue" %)**Channel1 data and Channel 2 data**(%%) ===
389 )))
390
391 (((
392 (% class="wikigeneratedid" %)
393 [[image:image-20220620103651-5.png]]
394
395
396 === (% style="color:blue" %)**Unix TimeStamp**(%%) ===
397 )))
398
399 Refer to Datalog feature.
400
401 (% style="color:#037691" %)**Example Uplink Payload**:
402
403 **Uplink payload example 1:**  0CE9011422EC2D6073E83B
404
405 * Bat voltage:0x0CE9 =3305mV
406 * Ext=0x01
407 * Channel1 temp=0x1422/100=51.54 ℃
408 * Channel2 temp=(0xEC2D-65536)/100=-50.75 ℃
409 * System timestamp=0x6073E83B= 1618208827(UTC)
410
411 **Uplink payload example 2: ** 0CED020203FE056073E697
412
413 * Bat voltage:0x0CED =3309mV
414 * Ext=0x02
415 * Channel1 temp=0x0203/10=515.4 ℃
416 * Channel2 temp=(0xFE05-65536)/10=-507.5 ℃
417 * System timestamp=0x6073E697=1618208407(UTC)
418
419 **Uplink payload example 3 :**  0CE9032EDE1F406073E967
420
421 * Bat voltage:0x0CE9 =3305mV
422 * Ext=0x03
423 * Channel1 res=0x2EDE/100=119.98 ohm
424 * Channel2 res=0x1F40/100=80.00 ohm
425 * System timestamp=0x6073E967= 1618209127(UTC)
426
427 (% 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" %)​(%%)​
428
429
430 == 2.5  Datalog Feature ==
431
432 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.
433
434
435 === 2.5.1  Unix TimeStamp ===
436
437
438 LTC2 uses Unix TimeStamp format based on
439
440 [[image:1655694312268-590.png]]
441
442 Users can get this time from the link:  [[https:~~/~~/www.epochconverter.com/>>url:https://www.epochconverter.com/]] :
443
444 Below is the converter example
445
446 [[image:1655694332878-202.png]]
447
448
449 (((
450 So, we can use AT+TIMESTAMP=1611889405 or downlink 3060137afd00 to set current time 2021 – Jan ~-~- 29 Friday 03:03:25
451 )))
452
453
454 === 2.5.2  Set Device Time ===
455
456 (((
457 (((
458 There are two ways to set the device's time:
459 )))
460 )))
461
462 (((
463 (((
464 (% style="color:#4f81bd" %)**1. Through LoRaWAN MAC Command (Default settings)**
465 )))
466 )))
467
468 (((
469 (((
470 Users need to set SYNCMOD=1 to enable sync time via the MAC command.
471 )))
472 )))
473
474 (((
475 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).
476
477
478 )))
479
480 (((
481 (((
482 (% 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.
483
484
485 )))
486
487 (((
488 (% style="color:#4f81bd" %)**2. Manually Set Time**
489 )))
490
491 (((
492 Users need to set SYNCMOD=0 to manual time, otherwise, the user set time will be overwritten by the time set by the server.
493 )))
494 )))
495
496
497
498 === 2.5.3  Poll sensor value ===
499
500 Users can poll sensor values based on timestamps. Below is the downlink command.
501
502 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:453.989px" %)
503 |=(% colspan="4" style="width: 451px;" %)**Downlink Command to poll Open/Close status (0x31)**
504 |(% style="width:59px" %)**1byte**|(% style="width:126px" %)**4bytes**|(% style="width:138px" %)**4bytes**|(% style="width:128px" %)**1byte**
505 |(% style="width:59px" %)31|(% style="width:126px" %)Timestamp start|(% style="width:138px" %)Timestamp end|(% style="width:128px" %)Uplink Interval
506
507 (((
508
509 )))
510
511 (((
512 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.
513
514 For example, downlink command[[image:image-20220620111056-7.png]]
515 )))
516
517 (((
518 Is to check 2021/5/16 01:00:00 to 2021/5/16 02:00:00's data
519
520 Uplink Internal =10s，means LTC2 will send one packet every 10s. range 5~~255s.
521 )))
522
523
524
525 === 2.5.4  Datalog Uplink payload ===
526
527 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"]].
528
529
530 (% style="color:red" %)**Note:**
531
532 * Poll Message Flag is set to 1.
533 * Each data entry is 11 bytes, to save airtime and battery, devices will send max bytes according to the current DR and Frequency bands.
534
535 For example, in US915 band, the max payload for different DR is:
536
537 1. DR0: max is 11 bytes so one entry of data
538 1. DR1: max is 53 bytes so devices will upload 4 entries of data (total 44 bytes)
539 1. DR2: total payload includes 11 entries of data
540 1. DR3: total payload includes 22 entries of data.
541
542 If devise doesn't have any data in the polling time. Device will uplink 11 bytes of 0   
543
544
545 **Example:**
546
547 If LTC2 has below data inside Flash:
548
549 [[image:image-20220620134635-9.png]]
550
551
552 If user send below downlink command:
553
554 **3160A06E9060A098C00A**
555
556 Where : Start time: 60A06E90 = time 21/5/16 01:00:00
557
558 Stop time: 60A098C0 = time 21/5/16 04:00:00
559
560
561 LTC2 will uplink this payload.
562
563
564 [[image:image-20220620111850-8.png]]
565
566 (% style="color:red" %)**0E64410B49800160A072B8**(%%)0E61410B3F800160A077680E61410B33800160A07C180E64410B2C800160A080C80E64410B28800160A085780E64410B24800160A08A280E64410B23800160A08ED80E64410B22800160A09388(% style="color:red" %)**0E64410B1E800160A09838**
567
568
569 Where the first 11 bytes is for the first entry:
570
571 (% style="color:red" %)**0E64410B49800160A072B8**
572
573 Bat voltage:0x0E64 =3684mV
574
575
576 poll message flag & Ext=0x41,means reply data,Ext=1
577
578 Channel1 temp=0x0B49/100=28.89℃
579
580 Channel2 temp=0x8001/100=-327.67℃
581
582 System timestamp=0x60A072B8= 1621127864(UTC)
583
584
585
586 == 2.6  ​Alarm Mode ==
587
588 (((
589 LTC2 can monito the temperature in every CTTEMP time, when the temperature exceed the limit , it will uplink the sensor value immediately.
590
591 Detail commands see:
592
593 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Enable Alarm Mode**>>||anchor="H3.9EnableAlarmmode"]]
594 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Config Alarm Sampling Time**>>||anchor="H3.10Alarmchecktime"]]
595 * [[(% class="wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink wikiinternallink" %)**Set Alarm Threshold**>>||anchor="H3.11SetAlarmThreshold"]]
596
597
598 )))
599
600
601 = 3.  Configure LTC2 via AT Command or LoRaWAN Downlink =
602
603 (((
604 (((
605 Use can configure LTC2 via AT Command or LoRaWAN Downlink.
606 )))
607 )))
608
609 * (((
610 (((
611 AT Command Connection: See [[FAQ>>||anchor="H6.A0FAQ"]].
612 )))
613 )))
614 * (((
615 (((
616 LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]]
617 )))
618 )))
619
620 (((
621 (((
622
623 )))
624
625 (((
626 There are two kinds of commands to configure LTC2, they are:
627 )))
628 )))
629
630 * (((
631 (((
632 (% style="color:#4f81bd" %)** General Commands**.
633 )))
634 )))
635
636 (((
637 (((
638 These commands are to configure:
639 )))
640 )))
641
642 * (((
643 (((
644 General system settings like: uplink interval.
645 )))
646 )))
647 * (((
648 (((
649 LoRaWAN protocol & radio related command.
650 )))
651 )))
652
653 (((
654 (((
655 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]]
656 )))
657 )))
658
659 (((
660 (((
661
662 )))
663 )))
664
665 * (((
666 (((
667 (% style="color:#4f81bd" %)** Commands special design for LTC2**
668 )))
669 )))
670
671 (((
672 (((
673 These commands only valid for LTC2, as below:(% title="Click and drag to resize" %)​
674 )))
675 )))
676
677 (% 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" %)​
678
679
680
681 == 3.1  Set Transmit Interval Time ==
682
683 Feature: Change LoRaWAN End Node Transmit Interval.
684
685 (% style="color:#037691" %)**AT Command: AT+TDC**
686
687 (% 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" %)​(%%)​
688
689
690 (((
691 (% style="color:#037691" %)**Downlink Command: 0x01**
692 )))
693
694 (((
695 (((
696 Format: Command Code (0x01) followed by 3 bytes time value.
697
698 (((
699 If the downlink payload=0100003C, it means set the END Node's Transmit Interval to 0x00003C=60(S), while type code is 01.
700 )))
701
702 * Example 1: Downlink Payload: 0100001E ~/~/ Set Transmit Interval (TDC) = 30 seconds
703 * Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds
704 )))
705 )))
706
707
708
709 == 3.2  Enable PT100 channels ==
710
711 Feature: Enable PT100 channels. Default only Enable Channel 1
712
713 (% style="color:#037691" %)**AT Command: AT+ENPTCHNUM**
714
715 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:494px" %)
716 |=(% style="width: 165px;" %)**Command Example**|=(% style="width: 254px;" %)**Function**|=(% style="width: 73px;" %)**Response**
717 |(% style="width:165px" %)AT+ENPTCHNUM=?|(% style="width:254px" %)Get current ENPTCHNUM settings|(% style="width:73px" %)(((
718 1
719
720 OK
721 )))
722 |(% style="width:165px" %)AT+ ENPTCHNUM =1|(% colspan="2" style="width:327px" %)Enable channel 1
723 |(% style="width:165px" %)AT+ ENPTCHNUM =2|(% colspan="2" style="width:327px" %)Enable channel 1 and 2
724
725 (% style="color:#037691" %)**Downlink Command: 0xA1**
726
727 Total bytes: 2 bytes
728
729 Example:
730
731 * 0xA101: same as AT+ENPTCHNUM =1
732 * 0xA102: same as AT+ENPTCHNUM =2
733
734
735
736 == 3.3  Set External Sensor Mode ==
737
738 (((
739 Feature: Change External Sensor Mode.
740 )))
741
742 (((
743 (% style="color:#037691" %)**Downlink Command: AT+EXT**
744 )))
745
746 (% 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" %)​(%%)​
747
748 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:428px" %)
749 |=(% style="width: 155px;" %)**Command Example**|=(% style="width: 180px;" %)**Function**|=(% style="width: 90px;" %)**Response**
750 |(% style="width:155px" %)AT+EXT=?|(% style="width:180px" %)Get current EXT settings|(% style="width:90px" %)(((
751 1
752
753 OK
754 )))
755 |(% style="width:155px" %)AT+EXT=1|(% colspan="2" style="width:270px" %)Set EXT to 0b(0001)
756 |(% style="width:155px" %)AT+EXT=2|(% colspan="2" style="width:270px" %)Set EXT to 0b(0010)
757 |(% style="width:155px" %)AT+EXT=3|(% colspan="2" style="width:270px" %)Set EXT to 0b(0011)
758
759 (% style="color:#037691" %)**Downlink Command: 0xA2**
760
761 Total bytes: 2 bytes
762
763 Example:
764
765 * 0xA201: same as AT+EXT=1
766
767
768
769 == 3.4 Quit AT Command ==
770
771 Feature: Quit AT Command mode, so user need to input password again before use AT Commands.
772
773 (% style="color:#037691" %)**AT Command: AT+DISAT**
774
775 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:446px" %)
776 |=(% style="width: 161px;" %)**Command Example**|=(% style="width: 193px;" %)**Function**|=(% style="width: 87px;" %)**Response**
777 |(% style="width:161px" %)AT+DISAT|(% style="width:193px" %)Quit AT Commands mode|(% style="width:87px" %)OK
778
779 (% style="color:#037691" %)**Downlink Command:**
780
781 No downlink command for this feature.
782
783
784
785 == 3.5 Set system time ==
786
787 Feature: Set system time, unix format. [[See here for formmat detail.>>||anchor="H2.5.1A0UnixTimeStamp"]]
788
789 (% style="color:#037691" %)**AT Command:**
790
791 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:506px" %)
792 |=(% style="width: 218px;" %)**Command Example**|=(% style="width: 285px;" %)**Function**
793 |(% style="width:218px" %)AT+TIMESTAMP=1611104352|(% style="width:285px" %)(((
794 OK
795
796 Set System time to 2021-01-20 00:59:12
797 )))
798
799 (% style="color:#037691" %)**Downlink Command:**
800
801 0x306007806000  ~/~/ Set timestamp to 0x(6007806000),Same as AT+TIMESTAMP=1611104352
802
803
804
805 == 3.6 Set Time Sync Mode ==
806
807 Feature: Enable/Disable Sync system time via LoRaWAN MAC Command (DeviceTimeReq), LoRaWAN server must support v1.0.3 protocol to reply this command.
808
809
810 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.
811
812
813 (% style="color:#037691" %)**AT Command:**
814
815 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:473px" %)
816 |=(% style="width: 157px;" %)**Command Example**|=(% style="width: 313px;" %)**Function**
817 |(% style="width:157px" %)AT+SYNCMOD=1|(% style="width:313px" %)Enable Sync system time via LoRaWAN MAC Command (DeviceTimeReq)
818
819 (% style="color:#037691" %)**Downlink Command:**
820
821 0x28 01 ~/~/ Same As AT+SYNCMOD=1
822
823 0x28 00 ~/~/ Same As AT+SYNCMOD=0
824
825
826
827 == 3.7 Set Time Sync Interval ==
828
829 Feature: Define System time sync interval. SYNCTDC default value: 10 days.
830
831 (% style="color:#037691" %)**AT Command:**
832
833 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:469px" %)
834 |=**Command Example**|=(% style="width: 306px;" %)**Function**
835 |AT+SYNCTDC=0x0A|(% style="width:306px" %)Set SYNCTDC to 10 (0x0A), so the sync time is 10 days.
836
837 (% style="color:#037691" %)**Downlink Command:**
838
839 0x29 0A ~/~/ Same as AT+SYNCTDC=0x0A
840
841
842
843 == 3.8 Retrieve data ==
844
845 Feature: Retrieval data for specify time slot.
846
847 (% style="color:#037691" %)**AT Command**(%%)**:**
848
849 No AT Command, only valid for downlink command.
850
851
852 (% style="color:#037691" %)**Downlink Command:**
853
854 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
855
856
857
858 == 3.9 Enable Alarm mode ==
859
860 Feature: Enable Alarm Mode.
861
862 (% style="color:#037691" %)**AT Command: AT_WMOD**
863
864 Total bytes: 2
865
866 Example:
867
868 0xA500: AT+WMOD=0(default)
869
870 0xA501: AT+WMOD=1(alarm mode)
871
872
873 (% style="color:#037691" %)**Downlink Command:**
874
875 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
876
877
878
879 == 3.10 Alarm check time ==
880
881 Feature: The time interval to check sensor value for Alarm.
882
883 (% style="color:#037691" %)**AT Command: AT+CITEMP**
884
885 Total bytes: 3
886
887 Example:
888
889 0xA60001: AT+CITEMP=1(default)
890
891 Set collection interval in 1min,only in alarm mode
892
893
894 (% style="color:#037691" %)**Downlink Command:**
895
896 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
897
898
899
900 == 3.11 Set Alarm Threshold ==
901
902 Feature: Set Alarm Threshold.
903
904 (% style="color:#037691" %)**AT Command: AT+ARTEMP**
905
906 Total bytes: 9  Unit: ℃
907
908 Example:
909
910 A7FF380320FF380320
911
912 AT+ARTEMP=-200,800,-200,800
913
914
915 A7000A0064000A0065
916
917 AT+ARTEMP=10,100,10,101
918
919 Channel 1 operating temp:10~~100
920
921 Channel 2 operating temp:10~~101
922
923
924 (% style="color:#037691" %)**Downlink Command:**
925
926 [[See Poll Sensor Value>>||anchor="H2.5.3A0Pollsensorvalue"]].
927
928
929
930 == 3.12 Set Calibrate Value ==
931
932 Feature: Set Calibrate value for PT100 cable.  Detail of use of this command please see [[connect to a customized PT100 Probe>>||anchor="H6.2A0HowtoconnectacustomizedPT100cable3F"]].
933
934 (% style="color:#037691" %)**AT Command: AT+RCABLE**
935
936 Total bytes: 5
937
938 Example:
939
940 AT+RCABLE=296,300
941
942 Channel 1 rcable=0x0128/1000=0.296R
943
944 Channel 2 rcable=0x012C/1000=0.300R
945
946
947 (% style="color:#037691" %)**Downlink Command:**
948
949 0xA80128012C  ~-~->  Same as AT+RCABLE=296,300
950
951
952
953 == 3.13 Poll Calibrate Value ==
954
955 Feature: Poll Calibrate value. LTC2 will reply with this command send an uplink to server.
956
957 (% style="color:#037691" %)**AT Command: No AT Command.**
958
959
960 (% style="color:#037691" %)**Downlink Command:**
961
962 Example: A901
963
964 End nodes will send racable config to server
965
966 Like uplink payload: 010128012C
967
968
969
970 == 3.14 Print data entries base on page ==
971
972 Feature: Print the sector data from start page to stop page (max is 400 pages).
973
974 (% style="color:#037691" %)**AT Command: AT+PDTA**
975
976 [[image:image-20220620145822-10.png]]
977
978
979 (% style="color:#037691" %)**Downlink Command:**
980
981 No downlink commands for feature
982
983
984
985 == 3.15 Print last few data entries ==
986
987 Feature: Print the last few data entries
988
989 (% style="color:#037691" %)**AT Command: AT+PLDTA**
990
991 [[image:image-20220620145916-11.png]]
992
993
994 (% style="color:#037691" %)**Downlink Command:**
995
996 No downlink commands for feature
997
998
999
1000 == 3.16 Clear Flash Record ==
1001
1002 Feature: Clear flash storage for data log feature.
1003
1004 (% style="color:#037691" %)**AT Command: AT+CLRDTA**
1005
1006 (% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:511px" %)
1007 |=(% style="width: 157px;" %)**Command Example**|=(% style="width: 136px;" %)**Function**|=(% style="width: 213px;" %)**Response**
1008 |(% style="width:157px" %)AT+CLRDTA|(% style="width:136px" %)Clear date record|(% style="width:213px" %)(((
1009 Clear all stored sensor data…
1010
1011 OK
1012 )))
1013
1014 (% style="color:#037691" %)**Downlink Command: 0xA3**
1015
1016 * Example: 0xA301 ~/~/Same as AT+CLRDTA
1017
1018
1019
1020 = 4.  Battery & How to replace =
1021
1022 == 4.1  Battery Type ==
1023
1024 (((
1025 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.
1026 )))
1027
1028 (((
1029 The discharge curve is not linear so can't simply use percentage to show the battery level. Below is the battery performance.
1030 )))
1031
1032 (% 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" %)​(%%)​
1033
1034
1035 Minimum Working Voltage for the LTC2:
1036
1037 LTC2:  3.0v ~~ 3.6v
1038
1039
1040
1041 == 4.2  Replace Battery ==
1042
1043 (((
1044
1045
1046 (((
1047 Any battery with 3.6v can be a replacement. We recommend to use Li-SOCl2 Battery.
1048 )))
1049 )))
1050
1051 (((
1052 (((
1053 And make sure the positive and negative pins match.
1054 )))
1055 )))
1056
1057
1058
1059 == 4.3  Power Consumption Analyze ==
1060
1061 (((
1062 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.
1063 )))
1064
1065 (((
1066 Instruction to use as below:
1067 )))
1068
1069
1070 **Step 1 :**  Downlink the up-to-date DRAGINO_Battery_Life_Prediction_Table.xlsx from:
1071
1072 [[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/]]
1073
1074
1075 **Step 2 :**  Open it and choose
1076
1077 * Product Model
1078 * Uplink Interval
1079 * Working Mode
1080
1081 And the Life expectation in difference case will be shown on the right.
1082
1083 (% 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" %)​(%%)​
1084
1085
1086
1087 = 5.  Firmware Change Log and Upload Firmware(% style="display:none" %) (%%) =
1088
1089 (((
1090 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:
1091 )))
1092
1093 (((
1094
1095 )))
1096
1097 (((
1098 **Connection:**
1099 )))
1100
1101 * (((
1102 (% style="background-color:yellow" %)**ST-LINK v2 GND  <~-~->  LTC2 GND**
1103 )))
1104 * (((
1105 (% style="background-color:yellow" %)**ST-LINK v2 RESET  <~-~->  LTC2 NRST**
1106 )))
1107 * (((
1108 (% style="background-color:yellow" %)**ST-LINK v2 SWCLK  <~-~->  LTC2 SWCLK**
1109 )))
1110 * (((
1111 (% style="background-color:yellow" %)**ST-LINK v2 SWDIO  <~-~->  LTC2 SWDIO**
1112 )))
1113 * (((
1114 (% style="background-color:yellow" %)**LTC2 power must be on.  **
1115 )))
1116
1117 (((
1118
1119
1120 **Firmware Location and Change Log:**
1121 )))
1122
1123 (((
1124 [[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/]]
1125 )))
1126
1127
1128
1129 = 6.  FAQ =
1130
1131 == 6.1  How to use AT Command to configure LTC2 ==
1132
1133 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.
1134
1135
1136 **Connection:**
1137
1138 * (% style="background-color:yellow" %)**USB to TTL GND <~-~->  LTC2 GND**
1139 * (% style="background-color:yellow" %)**USB to TTL RXD  <~-~->  LTC2 TXD**
1140 * (% style="background-color:yellow" %)**USB to TTL TXD  <~-~->  LTC2 RXD**
1141
1142 (((
1143 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.
1144 )))
1145
1146 (((
1147
1148 )))
1149
1150 (((
1151 Input password and ATZ to activate LTC2,As shown below:
1152 )))
1153
1154 [[image:image-20220620151601-13.png||height="454" width="1204"]]
1155
1156
1157
1158
1159 == 6.2  How to connect a customized PT100 cable? ==
1160
1161 (((
1162 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. 
1163 )))
1164
1165 (((
1166
1167 )))
1168
1169 (((
1170 (% 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.
1171 )))
1172
1173 [[image:image-20220620152115-14.jpeg||height="548" width="763"]]
1174
1175 We know that the Multimeter has a shortcut resistance 0.002 ohm.
1176
1177
1178 (% style="color:blue" %)**Step 2**(%%): Measure the resistance between the two shorted wires of PT100 Probe.
1179
1180 [[image:image-20220620152115-15.jpeg||height="791" width="704"]]
1181
1182 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) .
1183
1184
1185 (% style="color:blue" %)**Step 3**(%%): Run Calibrate Command.
1186
1187 Run this command to both channels to use 0.296R calibrate resistance.
1188
1189 **AT+RCABLE=296,0**   ~-~->  Calibrate Channel 1 with 0.296R
1190
1191
1192 Or use LoRaWAN downlink command (0xA8 Code) to set:
1193
1194 0xA801280000
1195
1196
1197 User can use 0xA9 downlink command to poll the current calibration value.
1198
1199
1200 (% style="color:blue" %)**Step 4**(%%)**: **Connect the PT100 to LTC2
1201
1202 [[image:image-20220620152115-16.png]]
1203
1204 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.
1205
1206
1207
1208 == 6.3  What is the frequency range of LTC2 LoRa part? ==
1209
1210 Different LTC2 version supports different frequency range, below is the table for the working frequency and recommend bands for each model:
1211
1212 [[image:image-20220620151440-12.png]]
1213
1214
1215
1216 == 6.4  How to change the LoRa Frequency Bands/Region ==
1217
1218 You can follow the instructions for [[how to upgrade image>>||anchor="H5.A0FirmwareChangeLogandUploadFirmware"]].
1219 When downloading the images, choose the required image file for download. ​
1220
1221
1222
1223 = 7.  Trouble Shooting =
1224
1225 == 7.1  AT Command input doesn't work ==
1226
1227 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.
1228
1229 (((
1230
1231 )))
1232
1233
1234 = 8.  Order Info =
1235
1236 Part Number **:** (% style="color:blue" %)**LTC2-XX-YYY**
1237
1238 (% style="color:#0000ff" %)**XX**(%%)**: **Probe Version
1239
1240 * (% style="color:red" %)**SI**(%%):  Standard IP68 probe x 1
1241 * (% style="color:red" %)**LT**(%%):  Low Temperature probe x 1
1242 * (% style="color:red" %)**HT**(%%): High Temperature probe x 1
1243 * (% style="color:red" %)**FS**(%%):  Food Safety probe x 1
1244 * (% style="color:red" %)**FT**(%%):  Flat Type probe x 1
1245 * (% style="color:red" %)**NA**(%%): No probe
1246
1247 (% style="color:#0000ff" %)**YYY**(%%)**: **The default frequency band
1248
1249 * (% style="color:red" %)**AS923 **(%%)**:** LoRaWAN AS923 band
1250 * (% style="color:red" %)**AU915 **(%%)**:** LoRaWAN AU915 band
1251 * (% style="color:red" %)**EU433 **(%%)**:** LoRaWAN EU433 band
1252 * (% style="color:red" %)**EU868 **(%%)**:** LoRaWAN EU868 band
1253 * (% style="color:red" %)**KR920 **(%%)**:** LoRaWAN KR920 band
1254 * (% style="color:red" %)**US915 **(%%)**:** LoRaWAN US915 band
1255 * (% style="color:red" %)**IN865 **(%%)**:**  LoRaWAN IN865 band
1256 * (% style="color:red" %)**CN470 **(%%)**:** LoRaWAN CN470 band
1257
1258
1259 = 9. ​ Packing Info =
1260
1261
1262 **Package Includes**:
1263
1264 * LTC2 LoRaWAN Temperature Transmitter x 1
1265
1266 **Dimension and weight**:
1267
1268 * Device Size: cm
1269 * Device Weight: g
1270 * Package Size / pcs : cm
1271 * Weight / pcs : g
1272
1273
1274 = 10.  ​Support =
1275
1276 * 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.
1277 * 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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