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Version 77.10 by Xiaoling on 2022/06/10 08:38
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1 (% style="text-align:center" %)
2 [[image:image-20220523163353-1.jpeg||height="604" width="500"]]
3
4 **LT-22222-L LoRa IO Controller User Manual **
5
6
7 **Table of Contents:**
8
9 {{toc/}}
10
11
12
13
14
15
16
17 = 1.Introduction =
18
19 == 1.1 What is LT Series I/O Controller ==
20
21 (((
22 The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
23 )))
24
25 (((
26 The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
27 )))
28
29 (((
30 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
31 )))
32
33 (((
34 The use environment includes:
35 )))
36
37 (((
38 1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.
39 )))
40
41 (((
42 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
43 )))
44
45 (((
46 [[image:1653295757274-912.png]]
47
48
49 )))
50
51 == 1.2  Specifications ==
52
53 (((
54
55
56 **Hardware System:**
57 )))
58
59 * (((
60 STM32L072CZT6 MCU
61 )))
62 * (((
63 SX1276/78 Wireless Chip 
64 )))
65 * (((
66 (((
67 Power Consumption:
68 )))
69
70 * (((
71 Idle: 4mA@12v
72 )))
73 * (((
74 20dB Transmit: 34mA@12v
75 )))
76 )))
77
78
79 (((
80 **Interface for Model: LT22222-L:**
81 )))
82
83 * (((
84 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
85 )))
86 * (((
87 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
88 )))
89 * (((
90 2 x Relay Output (5A@250VAC / 30VDC)
91 )))
92 * (((
93 2 x 0~~20mA Analog Input (res:0.01mA)
94 )))
95 * (((
96 2 x 0~~30V Analog Input (res:0.01v)
97 )))
98 * (((
99 Power Input 7~~ 24V DC. 
100 )))
101
102
103 (((
104 **LoRa Spec:**
105 )))
106
107 * (((
108 (((
109 Frequency Range:
110 )))
111
112 * (((
113 Band 1 (HF): 862 ~~ 1020 Mhz
114 )))
115 * (((
116 Band 2 (LF): 410 ~~ 528 Mhz
117 )))
118 )))
119 * (((
120 168 dB maximum link budget.
121 )))
122 * (((
123 +20 dBm - 100 mW constant RF output vs.
124 )))
125 * (((
126 +14 dBm high efficiency PA.
127 )))
128 * (((
129 Programmable bit rate up to 300 kbps.
130 )))
131 * (((
132 High sensitivity: down to -148 dBm.
133 )))
134 * (((
135 Bullet-proof front end: IIP3 = -12.5 dBm.
136 )))
137 * (((
138 Excellent blocking immunity.
139 )))
140 * (((
141 Low RX current of 10.3 mA, 200 nA register retention.
142 )))
143 * (((
144 Fully integrated synthesizer with a resolution of 61 Hz.
145 )))
146 * (((
147 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
148 )))
149 * (((
150 Built-in bit synchronizer for clock recovery.
151 )))
152 * (((
153 Preamble detection.
154 )))
155 * (((
156 127 dB Dynamic Range RSSI.
157 )))
158 * (((
159 Automatic RF Sense and CAD with ultra-fast AFC.
160 )))
161 * (((
162 Packet engine up to 256 bytes with CRC.
163
164
165 )))
166
167
168
169 == 1.3 Features ==
170
171 * LoRaWAN Class A & Class C protocol
172 * Optional Customized LoRa Protocol
173 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
174 * AT Commands to change parameters
175 * Remote configure parameters via LoRa Downlink
176 * Firmware upgradable via program port
177 * Counting
178
179
180
181 == 1.4  Applications ==
182
183 * Smart Buildings & Home Automation
184 * Logistics and Supply Chain Management
185 * Smart Metering
186 * Smart Agriculture
187 * Smart Cities
188 * Smart Factory
189
190
191
192 == 1.5 Hardware Variants ==
193
194 (% border="1" style="background-color:#f7faff; width:500px" %)
195 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
196 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
197 * 2 x Digital Input (Bi-direction)
198 * 2 x Digital Output
199 * 2 x Relay Output (5A@250VAC / 30VDC)
200 * 2 x 0~~20mA Analog Input (res:0.01mA)
201 * 2 x 0~~30V Analog Input (res:0.01v)
202 * 1 x Counting Port
203 )))
204
205
206
207 = 2. Power ON Device =
208
209 The LT controller can be powered by 7 ~~ 24V DC power source. Connect VIN to Power Input V+ and GND to power input V- to power the LT controller.
210
211 (((
212 PWR will on when device is properly powered.
213 )))
214
215 [[image:1653297104069-180.png]]
216
217
218
219 = 3. Operation Mode =
220
221 == 3.1 How it works? ==
222
223 (((
224 The LT is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the LT. It will auto join the network via OTAA. For LT-22222-L, the LED will show the Join status: After power on **TX LED** will fast blink 5 times, LT-22222-L will enter working mode and start to JOIN LoRaWAN network. **TX LED** will be on for 5 seconds after joined in network. When there is message from server, the **RX LED** will be on for 1 second. 
225 )))
226
227 (((
228 In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>||anchor="H4.UseATCommand"]] to set the keys in the devices.
229
230
231 )))
232
233
234
235 == 3.2 Example to join LoRaWAN network ==
236
237 (((
238 This chapter shows an example for how to join the TTN LoRaWAN Network. Below is the network structure, we use our LG308 as LoRaWAN gateway here. 
239 )))
240
241 [[image:image-20220523172350-1.png||height="266" width="864"]]
242
243 (((
244 The LG308 is already set to connect to [[TTN network >>url:https://www.thethingsnetwork.org/]]. So what we need to do now is only configure register this device to TTN:
245 )))
246
247 (((
248 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
249 )))
250
251 (((
252 Each LT is shipped with a sticker with the default device EUI as below:
253 )))
254
255 [[image:1653297924498-393.png]]
256
257 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
258
259 Add APP EUI in the application.
260
261 [[image:1653297955910-247.png||height="321" width="716"]]
262
263
264 Add APP KEY and DEV EUI
265
266 [[image:1653298023685-319.png]]
267
268
269 (((
270 **Step 2**: Power on LT and it will auto join to the TTN network. After join success, it will start to upload message to TTN and user can see in the panel.
271 )))
272
273 [[image:1653298044601-602.png||height="405" width="709"]]
274
275
276
277 == 3.3 Uplink Payload ==
278
279 There are five working modes + one interrupt mode on LT for different type application:
280
281 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
282 * **MOD2**: Double DI Counting + DO + RO
283 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
284 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
285 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
286 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
287
288
289
290 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
291
292 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
293
294 [[image:image-20220523174024-3.png]]
295
296 (((
297 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
298 )))
299
300 [[image:image-20220523174254-4.png]]
301
302 * RO is for relay. ROx=1 : close，ROx=0 always open.
303 * DI is for digital input. DIx=1: high or float, DIx=0: low.
304 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
305
306 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
307
308 For example if payload is: [[image:image-20220523175847-2.png]]
309
310 **The value for the interface is:  **
311
312 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
313
314 AVI2 channel voltage is 0x04AC/1000=1.196V
315
316 ACI1 channel current is 0x1310/1000=4.880mA
317
318 ACI2 channel current is 0x1300/1000=4.864mA
319
320 The last byte 0xAA= 10101010(B) means
321
322 * [1] RO1 relay channel is close and the RO1 LED is ON.
323 * [0] RO2 relay channel is open and RO2 LED is OFF;
324
325 **LT22222-L:**
326
327 * [1] DI2 channel is high input and DI2 LED is ON;
328 * [0] DI1 channel is low input;
329
330 * [0] DO3 channel output state
331 ** DO3 is float in case no load between DO3 and V+.;
332 ** DO3 is high in case there is load between DO3 and V+.
333 ** DO3 LED is off in both case
334 * [1] DO2 channel output is low and DO2 LED is ON.
335 * [0] DO1 channel output state
336 ** DO1 is float in case no load between DO1 and V+.;
337 ** DO1 is high in case there is load between DO1 and V+.
338 ** DO1 LED is off in both case
339
340 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
341
342 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
343
344 (((
345 Total : 11 bytes payload
346 )))
347
348 [[image:image-20220523180452-3.png]]
349
350 (((
351 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
352 )))
353
354 [[image:image-20220523180506-4.png]]
355
356 * RO is for relay. ROx=1 : close，ROx=0 always open.
357 * FIRST: Indicate this is the first packet after join network.
358 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
359
360 (((
361 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
362 )))
363
364 (((
365 **To use counting mode, please run:**
366 )))
367
368 (% class="box infomessage" %)
369 (((
370 (((
371 **AT+MOD=2**
372 )))
373 )))
374
375 (% class="box infomessage" %)
376 (((
377 (((
378 **ATZ**
379 )))
380 )))
381
382 (((
383 (% style="color:#4f81bd" %)**AT Commands for counting:**
384 )))
385
386 (((
387 **For LT22222-L:**
388 )))
389
390 (% class="box infomessage" %)
391 (((
392 (((
393 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
394 )))
395 )))
396
397 (% class="box infomessage" %)
398 (((
399 (((
400 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
401 )))
402 )))
403
404 (% class="box infomessage" %)
405 (((
406 (((
407 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
408 )))
409 )))
410
411 (% class="box infomessage" %)
412 (((
413 (((
414 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
415 )))
416 )))
417
418 (% class="box infomessage" %)
419 (((
420 (((
421 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
422 )))
423 )))
424
425 (% class="box infomessage" %)
426 (((
427 (((
428 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
429 )))
430 )))
431
432
433 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
434
435 **LT22222-L**: This mode the DI1 is used as a counting pin.
436
437 [[image:image-20220523181246-5.png]]
438
439 (((
440 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
441 )))
442
443 [[image:image-20220523181301-6.png]]
444
445 * RO is for relay. ROx=1 : close，ROx=0 always open.
446 * FIRST: Indicate this is the first packet after join network.
447 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
448
449 (((
450 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
451 )))
452
453 (((
454 **To use counting mode, please run:**
455 )))
456
457 (% class="box infomessage" %)
458 (((
459 (((
460 **AT+MOD=3**
461 )))
462 )))
463
464 (% class="box infomessage" %)
465 (((
466 (((
467 **ATZ**
468 )))
469 )))
470
471 (((
472 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
473
474
475 )))
476
477 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
478
479 **LT22222-L**: This mode the DI1 is used as a counting pin.
480
481 The AVI1 is also used for counting. AVI1 is used to monitor the voltage. It will check the voltage **every 60s**, if voltage is higher or lower than VOLMAX mV, the AVI1 Counting increase 1, so AVI1 counting can be used to measure a machine working hour.
482
483 [[image:image-20220523181903-8.png]]
484
485 (((
486 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
487 )))
488
489 [[image:image-20220523181727-7.png]]
490
491 * RO is for relay. ROx=1 : close，ROx=0 always open.
492 * FIRST: Indicate this is the first packet after join network.
493 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
494
495 (((
496 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
497 )))
498
499 (((
500 **To use this mode, please run:**
501 )))
502
503 (% class="box infomessage" %)
504 (((
505 (((
506 **AT+MOD=4**
507 )))
508 )))
509
510 (% class="box infomessage" %)
511 (((
512 (((
513 **ATZ**
514 )))
515 )))
516
517 (((
518
519 )))
520
521 (((
522 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
523 )))
524
525 (((
526 **Plus below command for AVI1 Counting:**
527 )))
528
529 (% class="box infomessage" %)
530 (((
531 (((
532 **AT+SETCNT=3,60   (set AVI Count to 60)**
533 )))
534 )))
535
536 (% class="box infomessage" %)
537 (((
538 (((
539 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
540 )))
541 )))
542
543 (% class="box infomessage" %)
544 (((
545 (((
546 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
547 )))
548 )))
549
550 (% class="box infomessage" %)
551 (((
552 (((
553 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
554 )))
555 )))
556
557
558 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
559
560 **LT22222-L**: This mode the DI1 is used as a counting pin.
561
562 [[image:image-20220523182334-9.png]]
563
564 (((
565 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
566 )))
567
568 * RO is for relay. ROx=1 : close，ROx=0 always open.
569 * FIRST: Indicate this is the first packet after join network.
570 * (((
571 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
572 )))
573
574 (((
575 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
576 )))
577
578 (((
579 **To use this mode, please run:**
580 )))
581
582 (% class="box infomessage" %)
583 (((
584 (((
585 **AT+MOD=5**
586 )))
587 )))
588
589 (% class="box infomessage" %)
590 (((
591 (((
592 **ATZ**
593 )))
594 )))
595
596 (((
597 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
598
599
600 )))
601
602 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
603
604 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
605
606 For example, if user has configured below commands:
607
608 * **AT+MOD=1 ** **~-~->** The normal working mode
609 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
610
611 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
612
613 1. Periodically uplink (Base on TDC time). Payload is same as the normal MOD (MOD 1 for above command). This uplink uses LoRaWAN (% style="color:#4f81bd" %)**unconfirmed**(%%) data type
614 1. Trigger uplink when meet the trigger condition. LT will sent two packets in this case, the first uplink use payload specify in this mod (mod=6), the second packets use the normal mod payload(MOD=1 for above settings). Both Uplinks use LoRaWAN (% style="color:#4f81bd" %)**CONFIRMED data type.**
615
616 **AT Command to set Trigger Condition**:
617
618 (% style="color:#4f81bd" %)**Trigger base on voltage**:
619
620 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
621
622 **Example:**
623
624 AT+AVLIM=3000,6000,0,2000   (If AVI1 voltage lower than 3v or higher than 6v. or AV2 voltage is higher than 2v, LT will trigger Uplink)
625
626 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
627
628
629 (% style="color:#4f81bd" %)**Trigger base on current**:
630
631 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
632
633 **Example:**
634
635 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
636
637
638 (% style="color:#4f81bd" %)**Trigger base on DI status**:
639
640 DI status trigger Flag.
641
642 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
643
644 **Example:**
645
646 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
647
648
649 **Downlink Command to set Trigger Condition**
650
651 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
652
653 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
654
655 AA: Code for this downlink Command:
656
657 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
658
659 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
660
661 yy2 yy2: AC1 or AV1 high limit.
662
663 yy3 yy3: AC2 or AV2 low limit.
664
665 Yy4 yy4: AC2 or AV2 high limit.
666
667 **Example1**: AA 00 13 88 00 00 00 00 00 00
668
669 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
670
671 **Example2**: AA 02 01 00
672
673 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
674
675 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
676
677 MOD6 Payload : total 11 bytes payload
678
679 [[image:image-20220524085923-1.png]]
680
681 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
682
683 [[image:image-20220524090106-2.png]]
684
685 * Each bits shows if the corresponding trigger has been configured.
686
687 **Example:**
688
689 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
690
691
692 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
693
694 [[image:image-20220524090249-3.png]]
695
696 * Each bits shows which status has been trigger on this uplink.
697
698 **Example:**
699
700 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
701
702
703 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
704
705 [[image:image-20220524090456-4.png]]
706
707 * Each bits shows which status has been trigger on this uplink.
708
709 **Example:**
710
711 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
712
713 00000101: Means both DI1 and DI2 trigger are enabled.
714
715
716 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
717
718 Downlink command to poll MOD6 status:
719
720 **AB 06**
721
722 When device got this command, it will send the MOD6 payload.
723
724
725 === 3.3.7 Payload Decoder ===
726
727 (((
728 **Decoder for TTN/loraserver/ChirpStack**: [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/Payload_decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/Payload_decoder/]]
729
730
731 )))
732
733 == 3.4 ​Configure LT via AT or Downlink ==
734
735 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
736
737 (((
738 There are two kinds of Commands:
739 )))
740
741 * (% style="color:#4f81bd" %)**Common Commands**(%%): They should be available for each sensor, such as: change uplink interval, reset device. For firmware v1.5.4, user can find what common commands it supports: [[End Device AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
742
743 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
744
745 === 3.4.1 Common Commands ===
746
747 They should be available for each of Dragino Sensors, such as: change uplink interval, reset device. For firmware v1.5.4, user can find what common commands it supports: [[End Device AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
748
749
750 === 3.4.2 Sensor related commands ===
751
752 ==== 3.4.2.1 Set Transmit Interval ====
753
754 Set device uplink interval.
755
756 * AT Command:
757
758 (% class="box infomessage" %)
759 (((
760 **AT+TDC=N **
761 )))
762
763 **Example: **AT+TDC=30000. Means set interval to 30 seconds
764
765 * Downlink Payload (prefix 0x01):
766
767 (% class="box infomessage" %)
768 (((
769 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
770 )))
771
772
773 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
774
775 Set work mode.
776
777 * AT Command:
778
779 (% class="box infomessage" %)
780 (((
781 **AT+MOD=N  **
782 )))
783
784 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
785
786 * Downlink Payload (prefix 0x0A):
787
788 (% class="box infomessage" %)
789 (((
790 **0x0A aa     ~/~/ Same as AT+MOD=aa**
791 )))
792
793
794 ==== 3.4.2.3 Poll an uplink ====
795
796 * AT Command:
797
798 There is no AT Command to poll uplink
799
800 * Downlink Payload (prefix 0x08):
801
802 (% class="box infomessage" %)
803 (((
804 **0x08 FF     ~/~/ Poll an uplink,**
805 )))
806
807 **Example**: 0x08FF, ask device to send an Uplink
808
809
810 ==== 3.4.2.4 Enable Trigger Mode ====
811
812 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
813
814 * AT Command:
815
816 (% class="box infomessage" %)
817 (((
818 **AT+ADDMOD6=1 or 0**
819 )))
820
821 1: Enable Trigger Mode
822
823 0: Disable Trigger Mode
824
825 * Downlink Payload (prefix 0x0A 06):
826
827 (% class="box infomessage" %)
828 (((
829 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
830 )))
831
832
833 ==== 3.4.2.5 Poll trigger settings ====
834
835 Poll trigger settings,
836
837 * AT Command:
838
839 There is no AT Command for this feature.
840
841 * Downlink Payload (prefix 0x AB 06):
842
843 (% class="box infomessage" %)
844 (((
845 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
846 )))
847
848
849 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
850
851 Enable Disable DI1/DI2/DI2 as trigger,
852
853 * AT Command:
854
855 (% class="box infomessage" %)
856 (((
857 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
858 )))
859
860 **Example:**
861
862 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
863
864 * Downlink Payload (prefix 0xAA 02):
865
866 (% class="box infomessage" %)
867 (((
868 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
869 )))
870
871
872 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
873
874 Set DI1 or DI3(for LT-33222-L) trigger.
875
876 * AT Command:
877
878 (% class="box infomessage" %)
879 (((
880 **AT+TRIG1=a,b**
881 )))
882
883 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
884
885 b : delay timing.
886
887 **Example:**
888
889 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
890
891 * Downlink Payload (prefix 0x09 01 ):
892
893 (% class="box infomessage" %)
894 (((
895 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
896 )))
897
898
899 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
900
901 Set DI2 trigger.
902
903 * AT Command:
904
905 (% class="box infomessage" %)
906 (((
907 **AT+TRIG2=a,b**
908 )))
909
910 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
911
912 b : delay timing.
913
914 **Example:**
915
916 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
917
918 * Downlink Payload (prefix 0x09 02 ):
919
920 (% class="box infomessage" %)
921 (((
922 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
923 )))
924
925
926 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
927
928 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
929
930 * AT Command:
931
932 (% class="box infomessage" %)
933 (((
934 **AT+ACLIM. **
935 )))
936
937 * Downlink Payload (prefix 0xAA 01 ):
938
939 (% class="box infomessage" %)
940 (((
941 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
942 )))
943
944
945 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
946
947 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
948
949 * AT Command:
950
951 (% class="box infomessage" %)
952 (((
953 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
954 )))
955
956 * Downlink Payload (prefix 0xAA 00 ):
957
958 (% class="box infomessage" %)
959 (((
960 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
961 )))
962
963
964 ==== 3.4.2.11 Trigger – Set minimum interval ====
965
966 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
967
968 * AT Command:
969
970 (% class="box infomessage" %)
971 (((
972 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
973 )))
974
975 * Downlink Payload (prefix 0xAC ):
976
977 (% class="box infomessage" %)
978 (((
979 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
980 )))
981
982
983 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
984
985 * AT Command:
986
987 There is no AT Command to control Digital Output
988
989 * Downlink Payload (prefix 0x02):
990
991 (% class="box infomessage" %)
992 (((
993 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
994 )))
995
996 (((
997 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
998 )))
999
1000 (((
1001 01: Low,  00: High ,  11: No action
1002 )))
1003
1004 [[image:image-20220524092754-5.png]]
1005
1006 (((
1007 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1008 )))
1009
1010 (((
1011 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1012 )))
1013
1014
1015 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1016
1017 * AT Command:
1018
1019 There is no AT Command to control Digital Output
1020
1021 * Downlink Payload (prefix 0xA9):
1022
1023 (% class="box infomessage" %)
1024 (((
1025 (((
1026 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1027 )))
1028 )))
1029
1030 This is to control the digital output time of DO pin. Include four bytes:
1031
1032 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1033
1034 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1035
1036 01: DO pins will change back to original state after timeout.
1037
1038 00: DO pins will change to an inverter state after timeout 
1039
1040 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1041
1042 [[image:image-20220524093238-6.png]]
1043
1044 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1045
1046 [[image:image-20220524093328-7.png]]
1047
1048 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1049
1050 [[image:image-20220524093351-8.png]]
1051
1052 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1053
1054 Latching time. Unit: ms
1055
1056 Device will upload a packet if downlink code executes successfully.
1057
1058 **Example payload:**
1059
1060 **~1. A9 01 01 01 01 07 D0**
1061
1062 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1063
1064 **2. A9 01 00 01 11 07 D0**
1065
1066 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1067
1068 **3. A9 00 00 00 00 07 D0**
1069
1070 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1071
1072 **4. A9 00 11 01 00 07 D0**
1073
1074 DO1 pin no action, DO2 pin set low, DO3 pin set high, last 2 seconds, then DO1 pin no action, DO2 pin set high, DO3 pin set low
1075
1076
1077 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1078
1079 * AT Command:
1080
1081 There is no AT Command to control Relay Output
1082
1083 * Downlink Payload (prefix 0x03):
1084
1085 (% class="box infomessage" %)
1086 (((
1087 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1088 )))
1089
1090 (((
1091 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1092 )))
1093
1094 (((
1095 01: Close ,  00: Open , 11: No action
1096 )))
1097
1098 (((
1099 [[image:image-20220524093724-9.png]]
1100 )))
1101
1102 Device will upload a packet if downlink code executes successfully.
1103
1104
1105 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1106
1107 * AT Command:
1108
1109 There is no AT Command to control Relay Output
1110
1111 * Downlink Payload (prefix 0x05):
1112
1113 (% class="box infomessage" %)
1114 (((
1115 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1116 )))
1117
1118 This is to control the relay output time of relay. Include four bytes:
1119
1120 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1121
1122 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1123
1124 01: Relays will change back to original state after timeout.
1125
1126 00: Relays will change to an inverter state after timeout
1127
1128 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1129
1130 [[image:image-20220524093831-10.png]]
1131
1132 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1133
1134 Device will upload a packet if downlink code executes successfully.
1135
1136 **Example payload:**
1137
1138 **~1. 05 01 11 07 D0**
1139
1140 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1141
1142 **2. 05 01 10 07 D0**
1143
1144 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1145
1146 **3. 05 00 01 07 D0**
1147
1148 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1149
1150 **4. 05 00 00 07 D0**
1151
1152 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1153
1154
1155 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1156
1157 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1158
1159 * AT Command:
1160
1161 (% class="box infomessage" %)
1162 (((
1163 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1164 )))
1165
1166 * Downlink Payload (prefix 0xA5):
1167
1168 (% class="box infomessage" %)
1169 (((
1170 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1171 )))
1172
1173
1174 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1175
1176 * AT Command:
1177
1178 (% class="box infomessage" %)
1179 (((
1180 **AT+SETCNT=aa,(bb cc dd ee) **
1181 )))
1182
1183 aa: 1: Set count1,
1184
1185 2: Set count2,
1186
1187 3: Set AV1 count
1188
1189 Bb cc dd ee: number to be set
1190
1191 * Downlink Payload (prefix 0xA8):
1192
1193 (% class="box infomessage" %)
1194 (((
1195 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1196 )))
1197
1198
1199 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1200
1201 Clear counting for counting mode
1202
1203 * AT Command:
1204
1205 (% class="box infomessage" %)
1206 (((
1207 **AT+CLRCOUNT ~/~/ clear all counting**
1208 )))
1209
1210 * Downlink Payload (prefix 0xA6):
1211
1212 (% class="box infomessage" %)
1213 (((
1214 **0x A6 01     ~/~/ clear all counting,**
1215 )))
1216
1217
1218 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1219
1220 * AT Command:
1221
1222 (% class="box infomessage" %)
1223 (((
1224 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1225 )))
1226
1227 * Downlink Payload (prefix 0xA7):
1228
1229 (% class="box infomessage" %)
1230 (((
1231 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1232 )))
1233
1234 (((
1235 range: aa bb cc:0 to 16777215,  (unit:second)
1236
1237
1238 )))
1239
1240 == 3.5 Integrate with Mydevice ==
1241
1242 Mydevices provides a human friendly interface to show the sensor data, once we have data in TTN, we can use Mydevices to connect to TTN and see the data in Mydevices. Below are the steps:
1243
1244 (((
1245 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1246 )))
1247
1248 (((
1249 **Step 2**: To configure the Application to forward data to Mydevices you will need to add integration. To add the Mydevices integration, perform the following steps:
1250 )))
1251
1252 [[image:1653356737703-362.png||height="232" width="732"]]
1253
1254 [[image:image-20220524094641-11.png||height="390" width="723"]]
1255
1256 [[image:image-20220524094641-12.png||height="402" width="718"]]
1257
1258
1259 **Step 3**: Create an account or log in Mydevices.
1260
1261 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1262
1263 Search under The things network
1264
1265 [[image:1653356838789-523.png||height="337" width="740"]]
1266
1267
1268 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1269
1270 [[image:image-20220524094909-1.png||height="335" width="729"]]
1271
1272 [[image:image-20220524094909-2.png||height="337" width="729"]]
1273
1274 [[image:image-20220524094909-3.png||height="338" width="727"]]
1275
1276 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1277
1278 [[image:image-20220524094909-5.png||height="341" width="734"]]
1279
1280
1281 == 3.6 Interface Detail ==
1282
1283 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1284
1285 Support NPN Type sensor
1286
1287 [[image:1653356991268-289.png]]
1288
1289
1290 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1291
1292 (((
1293 The DI port of LT-22222-L can support NPN or PNP output sensor.
1294 )))
1295
1296 (((
1297 (((
1298 Internal circuit as below, the NEC2501 is a photocoupler, the Active current (from NEC2501 pin 1 to pin 2 is 1ma and the max current is 50mA. When there is active current pass NEC2501 pin1 to pin2. The DI will be active high
1299 )))
1300 )))
1301
1302 [[image:1653357170703-587.png]]
1303
1304 (((
1305 (((
1306 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1307 )))
1308 )))
1309
1310 (((
1311
1312 )))
1313
1314 (((
1315 **Example1**: Connect to a Low active sensor.
1316 )))
1317
1318 (((
1319 This type of sensor will output a low signal GND when active.
1320 )))
1321
1322 * (((
1323 Connect sensor’s output to DI1-
1324 )))
1325 * (((
1326 Connect sensor’s VCC to DI1+.
1327 )))
1328
1329 (((
1330 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1331 )))
1332
1333 (((
1334 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1335 )))
1336
1337 (((
1338 If DI1+ = 12v, the [[image:1653968155772-850.png||height="23" width="19"]]= 12mA , So the LT-22222-L will be able to detect this active signal.
1339 )))
1340
1341 (((
1342
1343 )))
1344
1345 (((
1346 **Example2**: Connect to a High active sensor.
1347 )))
1348
1349 (((
1350 This type of sensor will output a high signal (example 24v) when active.
1351 )))
1352
1353 * (((
1354 Connect sensor’s output to DI1+
1355 )))
1356 * (((
1357 Connect sensor’s GND DI1-.
1358 )))
1359
1360 (((
1361 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1362 )))
1363
1364 (((
1365 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1366 )))
1367
1368 (((
1369 If **DI1+ = 24v**, the[[image:1653968155772-850.png||height="23" width="19"]] 24mA , So the LT-22222-L will be able to detect this high active signal.
1370 )))
1371
1372 (((
1373
1374 )))
1375
1376 (((
1377 **Example3**: Connect to a 220v high active sensor.
1378 )))
1379
1380 (((
1381 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1382 )))
1383
1384 * (((
1385 Connect sensor’s output to DI1+ with a serial 50K resistor
1386 )))
1387 * (((
1388 Connect sensor’s GND DI1-.
1389 )))
1390
1391 (((
1392 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1393 )))
1394
1395 (((
1396 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1397 )))
1398
1399 (((
1400 If sensor output is 220v, the [[image:1653968155772-850.png||height="23" width="19"]](% id="cke_bm_243359S" style="display:none" %)[[image:image-20220524095628-8.png]](%%) = DI1+ / 51K.  = 4.3mA , So the LT-22222-L will be able to detect this high active signal safely.
1401 )))
1402
1403
1404 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1405
1406 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1407
1408 [[image:1653357531600-905.png]]
1409
1410
1411 === 3.6.4 Analog Input Interface ===
1412
1413 The analog input interface is as below. The LT will measure the IN2 voltage so to calculate the current pass the Load. The formula is:
1414
1415 **AC2 = (IN2 voltage )/12**
1416
1417 [[image:1653357592296-182.png]]
1418
1419 Example to connect a 4~~20mA sensor
1420
1421 We take the wind speed sensor as an example for reference only.
1422
1423 Specifications of the wind speed sensor:
1424
1425 Red:12~~24v
1426
1427 Yellow:4~~20mA
1428
1429 Black:GND
1430
1431
1432 Connection diagram:
1433
1434 [[image:1653357640609-758.png]]
1435
1436 [[image:1653357648330-671.png||height="155" width="733"]]
1437
1438
1439 === 3.6.5 Relay Output ===
1440
1441 (((
1442 The LT serial controller has two relay interfaces; each interface uses two pins of the screw terminal. User can connect other device’s Power Line to in serial of RO1_1 and RO_2. Such as below:
1443 )))
1444
1445 [[image:image-20220524100215-9.png]]
1446
1447 [[image:image-20220524100215-10.png||height="382" width="723"]]
1448
1449
1450 == 3.7 LEDs Indicators ==
1451
1452 [[image:image-20220524100748-11.png]]
1453
1454
1455 = 4. Use AT Command =
1456
1457 == 4.1 Access AT Command ==
1458
1459 LT supports AT Command set. User can use a USB to TTL adapter plus the 3.5mm Program Cable to connect to LT for using AT command, as below.
1460
1461 [[image:1653358238933-385.png]]
1462
1463 (((
1464 In PC, User needs to set (% style="color:#4f81bd" %)**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 LT. The AT commands are disable by default and need to enter password (default:(% style="color:green" %)**123456**)(%%) to active it. As shown below:
1465 )))
1466
1467 [[image:1653358355238-883.png]]
1468
1469 (((
1470 More detail AT Command manual can be found at [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
1471 )))
1472
1473 (((
1474 AT+<CMD>?        : Help on <CMD>
1475 )))
1476
1477 (((
1478 AT+<CMD>         : Run <CMD>
1479 )))
1480
1481 (((
1482 AT+<CMD>=<value> : Set the value
1483 )))
1484
1485 (((
1486 AT+<CMD>=?       : Get the value
1487 )))
1488
1489 (((
1490 ATZ: Trig a reset of the MCU
1491 )))
1492
1493 (((
1494 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1495 )))
1496
1497 (((
1498 AT+DEUI: Get or Set the Device EUI
1499 )))
1500
1501 (((
1502 AT+DADDR: Get or Set the Device Address
1503 )))
1504
1505 (((
1506 AT+APPKEY: Get or Set the Application Key
1507 )))
1508
1509 (((
1510 AT+NWKSKEY: Get or Set the Network Session Key
1511 )))
1512
1513 (((
1514 AT+APPSKEY: Get or Set the Application Session Key
1515 )))
1516
1517 (((
1518 AT+APPEUI: Get or Set the Application EUI
1519 )))
1520
1521 (((
1522 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1523 )))
1524
1525 (((
1526 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1527 )))
1528
1529 (((
1530 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1531 )))
1532
1533 (((
1534 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1535 )))
1536
1537 (((
1538 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1539 )))
1540
1541 (((
1542 AT+RX2FQ: Get or Set the Rx2 window frequency
1543 )))
1544
1545 (((
1546 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1547 )))
1548
1549 (((
1550 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1551 )))
1552
1553 (((
1554 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1555 )))
1556
1557 (((
1558 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1559 )))
1560
1561 (((
1562 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1563 )))
1564
1565 (((
1566 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1567 )))
1568
1569 (((
1570 AT+NWKID: Get or Set the Network ID
1571 )))
1572
1573 (((
1574 AT+FCU: Get or Set the Frame Counter Uplink
1575 )))
1576
1577 (((
1578 AT+FCD: Get or Set the Frame Counter Downlink
1579 )))
1580
1581 (((
1582 AT+CLASS: Get or Set the Device Class
1583 )))
1584
1585 (((
1586 AT+JOIN: Join network
1587 )))
1588
1589 (((
1590 AT+NJS: Get OTAA Join Status
1591 )))
1592
1593 (((
1594 AT+SENDB: Send hexadecimal data along with the application port
1595 )))
1596
1597 (((
1598 AT+SEND: Send text data along with the application port
1599 )))
1600
1601 (((
1602 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1603 )))
1604
1605 (((
1606 AT+RECV: Print last received data in raw format
1607 )))
1608
1609 (((
1610 AT+VER: Get current image version and Frequency Band
1611 )))
1612
1613 (((
1614 AT+CFM: Get or Set the confirmation mode (0-1)
1615 )))
1616
1617 (((
1618 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1619 )))
1620
1621 (((
1622 AT+SNR: Get the SNR of the last received packet
1623 )))
1624
1625 (((
1626 AT+RSSI: Get the RSSI of the last received packet
1627 )))
1628
1629 (((
1630 AT+TDC: Get or set the application data transmission interval in ms
1631 )))
1632
1633 (((
1634 AT+PORT: Get or set the application port
1635 )))
1636
1637 (((
1638 AT+DISAT: Disable AT commands
1639 )))
1640
1641 (((
1642 AT+PWORD: Set password, max 9 digits
1643 )))
1644
1645 (((
1646 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1647 )))
1648
1649 (((
1650 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1651 )))
1652
1653 (((
1654 AT+CFG: Print all settings
1655
1656
1657 )))
1658
1659 == 4.2 Common AT Command Sequence ==
1660
1661 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1662
1663 (((
1664 If device has not joined network yet:
1665 )))
1666
1667 (((
1668 (% style="background-color:#dcdcdc" %)123456
1669 )))
1670
1671 (((
1672 (% style="background-color:#dcdcdc" %)AT+FDR
1673 )))
1674
1675 (((
1676 (% style="background-color:#dcdcdc" %)123456
1677 )))
1678
1679 (((
1680 (% style="background-color:#dcdcdc" %)AT+NJM=0
1681 )))
1682
1683 (((
1684 (% style="background-color:#dcdcdc" %)ATZ
1685 )))
1686
1687
1688 (((
1689 If device already joined network:
1690 )))
1691
1692 (((
1693 (% style="background-color:#dcdcdc" %)AT+NJM=0
1694 )))
1695
1696 (((
1697 (% style="background-color:#dcdcdc" %)ATZ
1698
1699
1700 )))
1701
1702 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1703
1704 (((
1705 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1706 )))
1707
1708 (((
1709 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1710 )))
1711
1712 (((
1713 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1714 )))
1715
1716 (((
1717 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1718 )))
1719
1720 (((
1721 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1722 )))
1723
1724 (((
1725 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1726 )))
1727
1728 (((
1729 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1730 )))
1731
1732 (((
1733 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1734 )))
1735
1736 (((
1737 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1738 )))
1739
1740 (((
1741 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1742 )))
1743
1744 (((
1745 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1746 )))
1747
1748 (((
1749 (% style="background-color:#dcdcdc" %) AT+DADDR=26 01 1A F1 (%%)Set Device Address to 26 01 1A F1, this ID can be found in the LoRa Server portal.
1750 )))
1751
1752 (((
1753 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1754 )))
1755
1756 (((
1757 (% style="color:red" %)**Note:**
1758 )))
1759
1760 (((
1761 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1762 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1763 3. Make sure SF / bandwidth setting in LG01/LG02 match the settings of AT+DR. refer [[this link>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/&file=LoRaWAN%201.0.3%20Regional%20Parameters.xlsx]] to see what DR means.
1764 4. The command AT+RX2FQ and AT+RX2DR is to let downlink work. to set the correct parameters, user can check the actually downlink parameters to be used. As below. Which shows the RX2FQ should use 868400000 and RX2DR should be 5
1765 )))
1766
1767 (((
1768 [[image:1653359097980-169.png||height="188" width="729"]]
1769 )))
1770
1771 (((
1772
1773 )))
1774
1775 === 4.2.3 Change to Class A ===
1776
1777 If sensor JOINED
1778 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1779 ATZ
1780
1781
1782 = 5. FAQ =
1783
1784 == 5.1 How to upgrade the image? ==
1785
1786 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1787
1788 * Support new features
1789 * For bug fix
1790 * Change LoRaWAN bands.
1791 Below shows the hardware connection for how to upload an image to the LT:
1792 * [[image:1653359603330-121.png]]
1793
1794 (((
1795 **Step1:** Download [[flash loader>>url:https://www.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-programmers/flasher-stm32.html]].
1796 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1797 **Step3: **Open flashloader; choose the correct COM port to update.
1798 **For LT-22222-L**:
1799 Hold down the PRO button and then momentarily press the RST reset button and the **DO1 led** will change from OFF to ON. When **DO1 LED** is on, it means the device is in download mode.
1800 )))
1801
1802 [[image:image-20220524103407-12.png]]
1803
1804 [[image:image-20220524103429-13.png]]
1805
1806 [[image:image-20220524104033-15.png]]
1807
1808 (% style="color:red" %)**Notice**(%%): In case user has lost the program cable. User can hand made one from a 3.5mm cable. The pin mapping is:
1809
1810 [[image:1653360054704-518.png||height="186" width="745"]]
1811
1812
1813 (((
1814 (((
1815 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1816 )))
1817 )))
1818
1819 (((
1820 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1821
1822
1823 )))
1824
1825 (((
1826 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1827 )))
1828
1829 (((
1830 (((
1831 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1832 )))
1833 )))
1834
1835 (((
1836 (((
1837 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1838 )))
1839 )))
1840
1841 (((
1842 (% style="color:#4f81bd" %)**Step1**(%%): Log in TTN, Create an ABP device in the application and input the network session key (NETSKEY), app session key (APPSKEY) from the device.
1843 )))
1844
1845 (((
1846 [[image:1653360231087-571.png||height="401" width="727"]]
1847 )))
1848
1849 (((
1850 (% style="color:red" %)Note: user just need to make sure above three keys match, User can change either in TTN or Device to make then match. In TTN, NETSKEY and APPSKEY can be configured by user in setting page, but Device Addr is generated by TTN.
1851 )))
1852
1853 (((
1854 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1855 )))
1856
1857 (((
1858 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1859 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1860 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1861 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1862 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1863 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1864 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1865 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1866 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1867 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1868 )))
1869
1870 (((
1871 As shown in below:
1872 )))
1873
1874 [[image:1653360498588-932.png||height="485" width="726"]]
1875
1876
1877 == 5.4 Can I see counting event in Serial? ==
1878
1879 (((
1880 User can run AT+DEBUG command to see the counting event in serial. If firmware too old and doesn’t support AT+DEBUG. User can update to latest firmware first.
1881
1882
1883 == 5.5 Can i use point to point communication for LT-22222-L? ==
1884
1885 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1886
1887
1888 )))
1889
1890 (((
1891 = 6. Trouble Shooting =
1892 )))
1893
1894 (((
1895 (((
1896 == 6.1 Downlink doesn’t work, how to solve it? ==
1897 )))
1898 )))
1899
1900 (((
1901 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1902
1903
1904 )))
1905
1906 (((
1907 == 6.2 Have trouble to upload image. ==
1908 )))
1909
1910 (((
1911 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1912 )))
1913
1914 (((
1915
1916 )))
1917
1918 (((
1919 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1920 )))
1921
1922 (((
1923 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1924 )))
1925
1926 (((
1927
1928 )))
1929
1930 (((
1931 = 7. Order Info =
1932 )))
1933
1934 (((
1935 (((
1936 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1937 )))
1938 )))
1939
1940 (((
1941 (((
1942 (% style="color:#4f81bd" %)**XXX:**
1943 )))
1944 )))
1945
1946 (((
1947 * (((
1948 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1949 )))
1950 )))
1951
1952 (((
1953 * (((
1954 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1955 )))
1956 )))
1957
1958 (((
1959 * (((
1960 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1961 )))
1962 )))
1963
1964 (((
1965 * (((
1966 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1967 )))
1968 )))
1969
1970 (((
1971 * (((
1972 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1973 )))
1974 )))
1975
1976 (((
1977 * (((
1978 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1979 )))
1980 )))
1981
1982 (((
1983 * (((
1984 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1985 )))
1986 )))
1987
1988 (((
1989 * (((
1990 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1991 )))
1992 )))
1993
1994 (((
1995 * (((
1996 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1997
1998
1999 )))
2000
2001 = 8. Packing Info =
2002 )))
2003
2004 (((
2005 (((
2006 **Package Includes**:
2007 )))
2008 )))
2009
2010 (((
2011 (((
2012 * LT-22222-L I/O Controller x 1
2013 * Stick Antenna for LoRa RF part x 1
2014 * Bracket for controller x1
2015 * Program cable x 1
2016 )))
2017 )))
2018
2019 (((
2020 (((
2021 **Dimension and weight**:
2022 )))
2023 )))
2024
2025 (((
2026 (((
2027 * Device Size: 13.5 x 7 x 3 cm
2028 * Device Weight: 105g
2029 * Package Size / pcs : 14.5 x 8 x 5 cm
2030 * Weight / pcs : 170g
2031
2032
2033 )))
2034 )))
2035
2036 (((
2037 = 9. Support =
2038 )))
2039
2040 * (((
2041 (((
2042 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.
2043 )))
2044 )))
2045 * (((
2046 (((
2047 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
2048 )))
2049 )))
2050
2051 (((
2052 (((
2053 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2054
2055
2056 )))
2057
2058 (((
2059 = 10. Reference​​​​​ =
2060
2061 * Product Page:
2062
2063 LT-22222-L: [[http:~~/~~/www.dragino.com/products/lora-lorawan-end-node/item/156-lt-22222-l.html>>url:http://www.dragino.com/products/lora-lorawan-end-node/item/156-lt-22222-l.html]]
2064
2065 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2066 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2067 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2068 )))
2069 )))