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Version 77.7 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 == 3.2 Example to join LoRaWAN network ==
234
235 (((
236 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. 
237 )))
238
239 [[image:image-20220523172350-1.png||height="266" width="864"]]
240
241 (((
242 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:
243 )))
244
245 (((
246 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
247 )))
248
249 (((
250 Each LT is shipped with a sticker with the default device EUI as below:
251 )))
252
253 [[image:1653297924498-393.png]]
254
255 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
256
257 Add APP EUI in the application.
258
259 [[image:1653297955910-247.png||height="321" width="716"]]
260
261
262 Add APP KEY and DEV EUI
263
264 [[image:1653298023685-319.png]]
265
266
267 (((
268 **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.
269 )))
270
271 [[image:1653298044601-602.png||height="405" width="709"]]
272
273
274 == 3.3 Uplink Payload ==
275
276 There are five working modes + one interrupt mode on LT for different type application:
277
278 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
279 * **MOD2**: Double DI Counting + DO + RO
280 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
281 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
282 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
283 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
284
285 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
286
287 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
288
289 [[image:image-20220523174024-3.png]]
290
291 (((
292 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
293 )))
294
295 [[image:image-20220523174254-4.png]]
296
297 * RO is for relay. ROx=1 : close，ROx=0 always open.
298 * DI is for digital input. DIx=1: high or float, DIx=0: low.
299 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
300
301 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
302
303 For example if payload is: [[image:image-20220523175847-2.png]]
304
305 **The value for the interface is:  **
306
307 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
308
309 AVI2 channel voltage is 0x04AC/1000=1.196V
310
311 ACI1 channel current is 0x1310/1000=4.880mA
312
313 ACI2 channel current is 0x1300/1000=4.864mA
314
315 The last byte 0xAA= 10101010(B) means
316
317 * [1] RO1 relay channel is close and the RO1 LED is ON.
318 * [0] RO2 relay channel is open and RO2 LED is OFF;
319
320 **LT22222-L:**
321
322 * [1] DI2 channel is high input and DI2 LED is ON;
323 * [0] DI1 channel is low input;
324
325 * [0] DO3 channel output state
326 ** DO3 is float in case no load between DO3 and V+.;
327 ** DO3 is high in case there is load between DO3 and V+.
328 ** DO3 LED is off in both case
329 * [1] DO2 channel output is low and DO2 LED is ON.
330 * [0] DO1 channel output state
331 ** DO1 is float in case no load between DO1 and V+.;
332 ** DO1 is high in case there is load between DO1 and V+.
333 ** DO1 LED is off in both case
334
335 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
336
337 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
338
339 (((
340 Total : 11 bytes payload
341 )))
342
343 [[image:image-20220523180452-3.png]]
344
345 (((
346 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
347 )))
348
349 [[image:image-20220523180506-4.png]]
350
351 * RO is for relay. ROx=1 : close，ROx=0 always open.
352 * FIRST: Indicate this is the first packet after join network.
353 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
354
355 (((
356 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
357 )))
358
359 (((
360 **To use counting mode, please run:**
361 )))
362
363 (% class="box infomessage" %)
364 (((
365 (((
366 **AT+MOD=2**
367 )))
368 )))
369
370 (% class="box infomessage" %)
371 (((
372 (((
373 **ATZ**
374 )))
375 )))
376
377 (((
378 (% style="color:#4f81bd" %)**AT Commands for counting:**
379 )))
380
381 (((
382 **For LT22222-L:**
383 )))
384
385 (% class="box infomessage" %)
386 (((
387 (((
388 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
389 )))
390 )))
391
392 (% class="box infomessage" %)
393 (((
394 (((
395 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
396 )))
397 )))
398
399 (% class="box infomessage" %)
400 (((
401 (((
402 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
403 )))
404 )))
405
406 (% class="box infomessage" %)
407 (((
408 (((
409 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
410 )))
411 )))
412
413 (% class="box infomessage" %)
414 (((
415 (((
416 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
417 )))
418 )))
419
420 (% class="box infomessage" %)
421 (((
422 (((
423 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
424 )))
425 )))
426
427
428 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
429
430 **LT22222-L**: This mode the DI1 is used as a counting pin.
431
432 [[image:image-20220523181246-5.png]]
433
434 (((
435 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
436 )))
437
438 [[image:image-20220523181301-6.png]]
439
440 * RO is for relay. ROx=1 : close，ROx=0 always open.
441 * FIRST: Indicate this is the first packet after join network.
442 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
443
444 (((
445 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
446 )))
447
448 (((
449 **To use counting mode, please run:**
450 )))
451
452 (% class="box infomessage" %)
453 (((
454 (((
455 **AT+MOD=3**
456 )))
457 )))
458
459 (% class="box infomessage" %)
460 (((
461 (((
462 **ATZ**
463 )))
464 )))
465
466 (((
467 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
468
469
470 )))
471
472 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
473
474 **LT22222-L**: This mode the DI1 is used as a counting pin.
475
476 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.
477
478 [[image:image-20220523181903-8.png]]
479
480 (((
481 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
482 )))
483
484 [[image:image-20220523181727-7.png]]
485
486 * RO is for relay. ROx=1 : close，ROx=0 always open.
487 * FIRST: Indicate this is the first packet after join network.
488 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
489
490 (((
491 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
492 )))
493
494 (((
495 **To use this mode, please run:**
496 )))
497
498 (% class="box infomessage" %)
499 (((
500 (((
501 **AT+MOD=4**
502 )))
503 )))
504
505 (% class="box infomessage" %)
506 (((
507 (((
508 **ATZ**
509 )))
510 )))
511
512 (((
513
514 )))
515
516 (((
517 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
518 )))
519
520 (((
521 **Plus below command for AVI1 Counting:**
522 )))
523
524 (% class="box infomessage" %)
525 (((
526 (((
527 **AT+SETCNT=3,60   (set AVI Count to 60)**
528 )))
529 )))
530
531 (% class="box infomessage" %)
532 (((
533 (((
534 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
535 )))
536 )))
537
538 (% class="box infomessage" %)
539 (((
540 (((
541 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
542 )))
543 )))
544
545 (% class="box infomessage" %)
546 (((
547 (((
548 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
549 )))
550 )))
551
552
553 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
554
555 **LT22222-L**: This mode the DI1 is used as a counting pin.
556
557 [[image:image-20220523182334-9.png]]
558
559 (((
560 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
561 )))
562
563 * RO is for relay. ROx=1 : close，ROx=0 always open.
564 * FIRST: Indicate this is the first packet after join network.
565 * (((
566 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
567 )))
568
569 (((
570 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
571 )))
572
573 (((
574 **To use this mode, please run:**
575 )))
576
577 (% class="box infomessage" %)
578 (((
579 (((
580 **AT+MOD=5**
581 )))
582 )))
583
584 (% class="box infomessage" %)
585 (((
586 (((
587 **ATZ**
588 )))
589 )))
590
591 (((
592 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
593
594
595 )))
596
597 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
598
599 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
600
601 For example, if user has configured below commands:
602
603 * **AT+MOD=1 ** **~-~->** The normal working mode
604 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
605
606 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
607
608 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
609 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.**
610
611 **AT Command to set Trigger Condition**:
612
613 (% style="color:#4f81bd" %)**Trigger base on voltage**:
614
615 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
616
617 **Example:**
618
619 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)
620
621 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
622
623
624 (% style="color:#4f81bd" %)**Trigger base on current**:
625
626 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
627
628 **Example:**
629
630 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
631
632
633 (% style="color:#4f81bd" %)**Trigger base on DI status**:
634
635 DI status trigger Flag.
636
637 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
638
639 **Example:**
640
641 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
642
643
644 **Downlink Command to set Trigger Condition**
645
646 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
647
648 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
649
650 AA: Code for this downlink Command:
651
652 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
653
654 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
655
656 yy2 yy2: AC1 or AV1 high limit.
657
658 yy3 yy3: AC2 or AV2 low limit.
659
660 Yy4 yy4: AC2 or AV2 high limit.
661
662 **Example1**: AA 00 13 88 00 00 00 00 00 00
663
664 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
665
666 **Example2**: AA 02 01 00
667
668 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
669
670 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
671
672 MOD6 Payload : total 11 bytes payload
673
674 [[image:image-20220524085923-1.png]]
675
676 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
677
678 [[image:image-20220524090106-2.png]]
679
680 * Each bits shows if the corresponding trigger has been configured.
681
682 **Example:**
683
684 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
685
686
687 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
688
689 [[image:image-20220524090249-3.png]]
690
691 * Each bits shows which status has been trigger on this uplink.
692
693 **Example:**
694
695 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
696
697
698 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
699
700 [[image:image-20220524090456-4.png]]
701
702 * Each bits shows which status has been trigger on this uplink.
703
704 **Example:**
705
706 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
707
708 00000101: Means both DI1 and DI2 trigger are enabled.
709
710
711 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
712
713 Downlink command to poll MOD6 status:
714
715 **AB 06**
716
717 When device got this command, it will send the MOD6 payload.
718
719
720 === 3.3.7 Payload Decoder ===
721
722 (((
723 **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/]]
724
725
726 )))
727
728 == 3.4 ​Configure LT via AT or Downlink ==
729
730 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
731
732 (((
733 There are two kinds of Commands:
734 )))
735
736 * (% 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]]
737
738 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
739
740 === 3.4.1 Common Commands ===
741
742 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]]
743
744
745 === 3.4.2 Sensor related commands ===
746
747 ==== 3.4.2.1 Set Transmit Interval ====
748
749 Set device uplink interval.
750
751 * AT Command:
752
753 (% class="box infomessage" %)
754 (((
755 **AT+TDC=N **
756 )))
757
758 **Example: **AT+TDC=30000. Means set interval to 30 seconds
759
760 * Downlink Payload (prefix 0x01):
761
762 (% class="box infomessage" %)
763 (((
764 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
765 )))
766
767
768 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
769
770 Set work mode.
771
772 * AT Command:
773
774 (% class="box infomessage" %)
775 (((
776 **AT+MOD=N  **
777 )))
778
779 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
780
781 * Downlink Payload (prefix 0x0A):
782
783 (% class="box infomessage" %)
784 (((
785 **0x0A aa     ~/~/ Same as AT+MOD=aa**
786 )))
787
788
789 ==== 3.4.2.3 Poll an uplink ====
790
791 * AT Command:
792
793 There is no AT Command to poll uplink
794
795 * Downlink Payload (prefix 0x08):
796
797 (% class="box infomessage" %)
798 (((
799 **0x08 FF     ~/~/ Poll an uplink,**
800 )))
801
802 **Example**: 0x08FF, ask device to send an Uplink
803
804
805 ==== 3.4.2.4 Enable Trigger Mode ====
806
807 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
808
809 * AT Command:
810
811 (% class="box infomessage" %)
812 (((
813 **AT+ADDMOD6=1 or 0**
814 )))
815
816 1: Enable Trigger Mode
817
818 0: Disable Trigger Mode
819
820 * Downlink Payload (prefix 0x0A 06):
821
822 (% class="box infomessage" %)
823 (((
824 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
825 )))
826
827
828 ==== 3.4.2.5 Poll trigger settings ====
829
830 Poll trigger settings,
831
832 * AT Command:
833
834 There is no AT Command for this feature.
835
836 * Downlink Payload (prefix 0x AB 06):
837
838 (% class="box infomessage" %)
839 (((
840 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
841 )))
842
843
844 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
845
846 Enable Disable DI1/DI2/DI2 as trigger,
847
848 * AT Command:
849
850 (% class="box infomessage" %)
851 (((
852 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
853 )))
854
855 **Example:**
856
857 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
858
859 * Downlink Payload (prefix 0xAA 02):
860
861 (% class="box infomessage" %)
862 (((
863 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
864 )))
865
866
867 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
868
869 Set DI1 or DI3(for LT-33222-L) trigger.
870
871 * AT Command:
872
873 (% class="box infomessage" %)
874 (((
875 **AT+TRIG1=a,b**
876 )))
877
878 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
879
880 b : delay timing.
881
882 **Example:**
883
884 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
885
886 * Downlink Payload (prefix 0x09 01 ):
887
888 (% class="box infomessage" %)
889 (((
890 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
891 )))
892
893
894 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
895
896 Set DI2 trigger.
897
898 * AT Command:
899
900 (% class="box infomessage" %)
901 (((
902 **AT+TRIG2=a,b**
903 )))
904
905 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
906
907 b : delay timing.
908
909 **Example:**
910
911 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
912
913 * Downlink Payload (prefix 0x09 02 ):
914
915 (% class="box infomessage" %)
916 (((
917 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
918 )))
919
920
921 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
922
923 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
924
925 * AT Command:
926
927 (% class="box infomessage" %)
928 (((
929 **AT+ACLIM. **
930 )))
931
932 * Downlink Payload (prefix 0xAA 01 ):
933
934 (% class="box infomessage" %)
935 (((
936 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
937 )))
938
939
940 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
941
942 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
943
944 * AT Command:
945
946 (% class="box infomessage" %)
947 (((
948 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
949 )))
950
951 * Downlink Payload (prefix 0xAA 00 ):
952
953 (% class="box infomessage" %)
954 (((
955 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
956 )))
957
958
959 ==== 3.4.2.11 Trigger – Set minimum interval ====
960
961 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
962
963 * AT Command:
964
965 (% class="box infomessage" %)
966 (((
967 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
968 )))
969
970 * Downlink Payload (prefix 0xAC ):
971
972 (% class="box infomessage" %)
973 (((
974 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
975 )))
976
977
978 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
979
980 * AT Command:
981
982 There is no AT Command to control Digital Output
983
984 * Downlink Payload (prefix 0x02):
985
986 (% class="box infomessage" %)
987 (((
988 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
989 )))
990
991 (((
992 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
993 )))
994
995 (((
996 01: Low,  00: High ,  11: No action
997 )))
998
999 [[image:image-20220524092754-5.png]]
1000
1001 (((
1002 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1003 )))
1004
1005 (((
1006 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1007 )))
1008
1009
1010 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1011
1012 * AT Command:
1013
1014 There is no AT Command to control Digital Output
1015
1016 * Downlink Payload (prefix 0xA9):
1017
1018 (% class="box infomessage" %)
1019 (((
1020 (((
1021 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1022 )))
1023 )))
1024
1025 This is to control the digital output time of DO pin. Include four bytes:
1026
1027 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1028
1029 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1030
1031 01: DO pins will change back to original state after timeout.
1032
1033 00: DO pins will change to an inverter state after timeout 
1034
1035 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1036
1037 [[image:image-20220524093238-6.png]]
1038
1039 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1040
1041 [[image:image-20220524093328-7.png]]
1042
1043 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1044
1045 [[image:image-20220524093351-8.png]]
1046
1047 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1048
1049 Latching time. Unit: ms
1050
1051 Device will upload a packet if downlink code executes successfully.
1052
1053 **Example payload:**
1054
1055 **~1. A9 01 01 01 01 07 D0**
1056
1057 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1058
1059 **2. A9 01 00 01 11 07 D0**
1060
1061 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1062
1063 **3. A9 00 00 00 00 07 D0**
1064
1065 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1066
1067 **4. A9 00 11 01 00 07 D0**
1068
1069 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
1070
1071
1072 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1073
1074 * AT Command:
1075
1076 There is no AT Command to control Relay Output
1077
1078 * Downlink Payload (prefix 0x03):
1079
1080 (% class="box infomessage" %)
1081 (((
1082 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1083 )))
1084
1085 (((
1086 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1087 )))
1088
1089 (((
1090 01: Close ,  00: Open , 11: No action
1091 )))
1092
1093 (((
1094 [[image:image-20220524093724-9.png]]
1095 )))
1096
1097 Device will upload a packet if downlink code executes successfully.
1098
1099
1100 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1101
1102 * AT Command:
1103
1104 There is no AT Command to control Relay Output
1105
1106 * Downlink Payload (prefix 0x05):
1107
1108 (% class="box infomessage" %)
1109 (((
1110 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1111 )))
1112
1113 This is to control the relay output time of relay. Include four bytes:
1114
1115 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1116
1117 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1118
1119 01: Relays will change back to original state after timeout.
1120
1121 00: Relays will change to an inverter state after timeout
1122
1123 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1124
1125 [[image:image-20220524093831-10.png]]
1126
1127 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1128
1129 Device will upload a packet if downlink code executes successfully.
1130
1131 **Example payload:**
1132
1133 **~1. 05 01 11 07 D0**
1134
1135 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1136
1137 **2. 05 01 10 07 D0**
1138
1139 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1140
1141 **3. 05 00 01 07 D0**
1142
1143 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1144
1145 **4. 05 00 00 07 D0**
1146
1147 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1148
1149
1150 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1151
1152 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1153
1154 * AT Command:
1155
1156 (% class="box infomessage" %)
1157 (((
1158 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1159 )))
1160
1161 * Downlink Payload (prefix 0xA5):
1162
1163 (% class="box infomessage" %)
1164 (((
1165 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1166 )))
1167
1168
1169 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1170
1171 * AT Command:
1172
1173 (% class="box infomessage" %)
1174 (((
1175 **AT+SETCNT=aa,(bb cc dd ee) **
1176 )))
1177
1178 aa: 1: Set count1,
1179
1180 2: Set count2,
1181
1182 3: Set AV1 count
1183
1184 Bb cc dd ee: number to be set
1185
1186 * Downlink Payload (prefix 0xA8):
1187
1188 (% class="box infomessage" %)
1189 (((
1190 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1191 )))
1192
1193
1194 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1195
1196 Clear counting for counting mode
1197
1198 * AT Command:
1199
1200 (% class="box infomessage" %)
1201 (((
1202 **AT+CLRCOUNT ~/~/ clear all counting**
1203 )))
1204
1205 * Downlink Payload (prefix 0xA6):
1206
1207 (% class="box infomessage" %)
1208 (((
1209 **0x A6 01     ~/~/ clear all counting,**
1210 )))
1211
1212
1213 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1214
1215 * AT Command:
1216
1217 (% class="box infomessage" %)
1218 (((
1219 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1220 )))
1221
1222 * Downlink Payload (prefix 0xA7):
1223
1224 (% class="box infomessage" %)
1225 (((
1226 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1227 )))
1228
1229 (((
1230 range: aa bb cc:0 to 16777215,  (unit:second)
1231
1232
1233 )))
1234
1235 == 3.5 Integrate with Mydevice ==
1236
1237 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:
1238
1239 (((
1240 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1241 )))
1242
1243 (((
1244 **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:
1245 )))
1246
1247 [[image:1653356737703-362.png||height="232" width="732"]]
1248
1249 [[image:image-20220524094641-11.png||height="390" width="723"]]
1250
1251 [[image:image-20220524094641-12.png||height="402" width="718"]]
1252
1253
1254 **Step 3**: Create an account or log in Mydevices.
1255
1256 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1257
1258 Search under The things network
1259
1260 [[image:1653356838789-523.png||height="337" width="740"]]
1261
1262
1263 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1264
1265 [[image:image-20220524094909-1.png||height="335" width="729"]]
1266
1267 [[image:image-20220524094909-2.png||height="337" width="729"]]
1268
1269 [[image:image-20220524094909-3.png||height="338" width="727"]]
1270
1271 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1272
1273 [[image:image-20220524094909-5.png||height="341" width="734"]]
1274
1275
1276 == 3.6 Interface Detail ==
1277
1278 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1279
1280 Support NPN Type sensor
1281
1282 [[image:1653356991268-289.png]]
1283
1284
1285 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1286
1287 (((
1288 The DI port of LT-22222-L can support NPN or PNP output sensor.
1289 )))
1290
1291 (((
1292 (((
1293 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
1294 )))
1295 )))
1296
1297 [[image:1653357170703-587.png]]
1298
1299 (((
1300 (((
1301 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1302 )))
1303 )))
1304
1305 (((
1306
1307 )))
1308
1309 (((
1310 **Example1**: Connect to a Low active sensor.
1311 )))
1312
1313 (((
1314 This type of sensor will output a low signal GND when active.
1315 )))
1316
1317 * (((
1318 Connect sensor’s output to DI1-
1319 )))
1320 * (((
1321 Connect sensor’s VCC to DI1+.
1322 )))
1323
1324 (((
1325 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1326 )))
1327
1328 (((
1329 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1330 )))
1331
1332 (((
1333 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.
1334 )))
1335
1336 (((
1337
1338 )))
1339
1340 (((
1341 **Example2**: Connect to a High active sensor.
1342 )))
1343
1344 (((
1345 This type of sensor will output a high signal (example 24v) when active.
1346 )))
1347
1348 * (((
1349 Connect sensor’s output to DI1+
1350 )))
1351 * (((
1352 Connect sensor’s GND DI1-.
1353 )))
1354
1355 (((
1356 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1357 )))
1358
1359 (((
1360 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1361 )))
1362
1363 (((
1364 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.
1365 )))
1366
1367 (((
1368
1369 )))
1370
1371 (((
1372 **Example3**: Connect to a 220v high active sensor.
1373 )))
1374
1375 (((
1376 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1377 )))
1378
1379 * (((
1380 Connect sensor’s output to DI1+ with a serial 50K resistor
1381 )))
1382 * (((
1383 Connect sensor’s GND DI1-.
1384 )))
1385
1386 (((
1387 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1388 )))
1389
1390 (((
1391 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1392 )))
1393
1394 (((
1395 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.
1396 )))
1397
1398
1399 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1400
1401 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1402
1403 [[image:1653357531600-905.png]]
1404
1405
1406 === 3.6.4 Analog Input Interface ===
1407
1408 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:
1409
1410 **AC2 = (IN2 voltage )/12**
1411
1412 [[image:1653357592296-182.png]]
1413
1414 Example to connect a 4~~20mA sensor
1415
1416 We take the wind speed sensor as an example for reference only.
1417
1418 Specifications of the wind speed sensor:
1419
1420 Red:12~~24v
1421
1422 Yellow:4~~20mA
1423
1424 Black:GND
1425
1426
1427 Connection diagram:
1428
1429 [[image:1653357640609-758.png]]
1430
1431 [[image:1653357648330-671.png||height="155" width="733"]]
1432
1433
1434 === 3.6.5 Relay Output ===
1435
1436 (((
1437 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:
1438 )))
1439
1440 [[image:image-20220524100215-9.png]]
1441
1442 [[image:image-20220524100215-10.png||height="382" width="723"]]
1443
1444
1445 == 3.7 LEDs Indicators ==
1446
1447 [[image:image-20220524100748-11.png]]
1448
1449
1450 = 4. Use AT Command =
1451
1452 == 4.1 Access AT Command ==
1453
1454 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.
1455
1456 [[image:1653358238933-385.png]]
1457
1458 (((
1459 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:
1460 )))
1461
1462 [[image:1653358355238-883.png]]
1463
1464 (((
1465 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/]]
1466 )))
1467
1468 (((
1469 AT+<CMD>?        : Help on <CMD>
1470 )))
1471
1472 (((
1473 AT+<CMD>         : Run <CMD>
1474 )))
1475
1476 (((
1477 AT+<CMD>=<value> : Set the value
1478 )))
1479
1480 (((
1481 AT+<CMD>=?       : Get the value
1482 )))
1483
1484 (((
1485 ATZ: Trig a reset of the MCU
1486 )))
1487
1488 (((
1489 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1490 )))
1491
1492 (((
1493 AT+DEUI: Get or Set the Device EUI
1494 )))
1495
1496 (((
1497 AT+DADDR: Get or Set the Device Address
1498 )))
1499
1500 (((
1501 AT+APPKEY: Get or Set the Application Key
1502 )))
1503
1504 (((
1505 AT+NWKSKEY: Get or Set the Network Session Key
1506 )))
1507
1508 (((
1509 AT+APPSKEY: Get or Set the Application Session Key
1510 )))
1511
1512 (((
1513 AT+APPEUI: Get or Set the Application EUI
1514 )))
1515
1516 (((
1517 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1518 )))
1519
1520 (((
1521 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1522 )))
1523
1524 (((
1525 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1526 )))
1527
1528 (((
1529 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1530 )))
1531
1532 (((
1533 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1534 )))
1535
1536 (((
1537 AT+RX2FQ: Get or Set the Rx2 window frequency
1538 )))
1539
1540 (((
1541 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1542 )))
1543
1544 (((
1545 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1546 )))
1547
1548 (((
1549 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1550 )))
1551
1552 (((
1553 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1554 )))
1555
1556 (((
1557 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1558 )))
1559
1560 (((
1561 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1562 )))
1563
1564 (((
1565 AT+NWKID: Get or Set the Network ID
1566 )))
1567
1568 (((
1569 AT+FCU: Get or Set the Frame Counter Uplink
1570 )))
1571
1572 (((
1573 AT+FCD: Get or Set the Frame Counter Downlink
1574 )))
1575
1576 (((
1577 AT+CLASS: Get or Set the Device Class
1578 )))
1579
1580 (((
1581 AT+JOIN: Join network
1582 )))
1583
1584 (((
1585 AT+NJS: Get OTAA Join Status
1586 )))
1587
1588 (((
1589 AT+SENDB: Send hexadecimal data along with the application port
1590 )))
1591
1592 (((
1593 AT+SEND: Send text data along with the application port
1594 )))
1595
1596 (((
1597 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1598 )))
1599
1600 (((
1601 AT+RECV: Print last received data in raw format
1602 )))
1603
1604 (((
1605 AT+VER: Get current image version and Frequency Band
1606 )))
1607
1608 (((
1609 AT+CFM: Get or Set the confirmation mode (0-1)
1610 )))
1611
1612 (((
1613 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1614 )))
1615
1616 (((
1617 AT+SNR: Get the SNR of the last received packet
1618 )))
1619
1620 (((
1621 AT+RSSI: Get the RSSI of the last received packet
1622 )))
1623
1624 (((
1625 AT+TDC: Get or set the application data transmission interval in ms
1626 )))
1627
1628 (((
1629 AT+PORT: Get or set the application port
1630 )))
1631
1632 (((
1633 AT+DISAT: Disable AT commands
1634 )))
1635
1636 (((
1637 AT+PWORD: Set password, max 9 digits
1638 )))
1639
1640 (((
1641 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1642 )))
1643
1644 (((
1645 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1646 )))
1647
1648 (((
1649 AT+CFG: Print all settings
1650
1651
1652 )))
1653
1654 == 4.2 Common AT Command Sequence ==
1655
1656 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1657
1658 (((
1659 If device has not joined network yet:
1660 )))
1661
1662 (((
1663 (% style="background-color:#dcdcdc" %)123456
1664 )))
1665
1666 (((
1667 (% style="background-color:#dcdcdc" %)AT+FDR
1668 )))
1669
1670 (((
1671 (% style="background-color:#dcdcdc" %)123456
1672 )))
1673
1674 (((
1675 (% style="background-color:#dcdcdc" %)AT+NJM=0
1676 )))
1677
1678 (((
1679 (% style="background-color:#dcdcdc" %)ATZ
1680 )))
1681
1682
1683 (((
1684 If device already joined network:
1685 )))
1686
1687 (((
1688 (% style="background-color:#dcdcdc" %)AT+NJM=0
1689 )))
1690
1691 (((
1692 (% style="background-color:#dcdcdc" %)ATZ
1693
1694
1695 )))
1696
1697 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1698
1699 (((
1700 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1701 )))
1702
1703 (((
1704 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1705 )))
1706
1707 (((
1708 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1709 )))
1710
1711 (((
1712 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1713 )))
1714
1715 (((
1716 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1717 )))
1718
1719 (((
1720 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1721 )))
1722
1723 (((
1724 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1725 )))
1726
1727 (((
1728 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1729 )))
1730
1731 (((
1732 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1733 )))
1734
1735 (((
1736 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1737 )))
1738
1739 (((
1740 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1741 )))
1742
1743 (((
1744 (% 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.
1745 )))
1746
1747 (((
1748 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1749 )))
1750
1751 (((
1752 (% style="color:red" %)**Note:**
1753 )))
1754
1755 (((
1756 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1757 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1758 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.
1759 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
1760 )))
1761
1762 (((
1763 [[image:1653359097980-169.png||height="188" width="729"]]
1764 )))
1765
1766 (((
1767
1768 )))
1769
1770 === 4.2.3 Change to Class A ===
1771
1772 If sensor JOINED
1773 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1774 ATZ
1775
1776
1777 = 5. FAQ =
1778
1779 == 5.1 How to upgrade the image? ==
1780
1781 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1782
1783 * Support new features
1784 * For bug fix
1785 * Change LoRaWAN bands.
1786 Below shows the hardware connection for how to upload an image to the LT:
1787 * [[image:1653359603330-121.png]]
1788
1789 (((
1790 **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]].
1791 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1792 **Step3: **Open flashloader; choose the correct COM port to update.
1793 **For LT-22222-L**:
1794 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.
1795 )))
1796
1797 [[image:image-20220524103407-12.png]]
1798
1799 [[image:image-20220524103429-13.png]]
1800
1801 [[image:image-20220524104033-15.png]]
1802
1803 (% 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:
1804
1805 [[image:1653360054704-518.png||height="186" width="745"]]
1806
1807
1808 (((
1809 (((
1810 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1811 )))
1812 )))
1813
1814 (((
1815 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1816
1817
1818 )))
1819
1820 (((
1821 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1822 )))
1823
1824 (((
1825 (((
1826 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1827 )))
1828 )))
1829
1830 (((
1831 (((
1832 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1833 )))
1834 )))
1835
1836 (((
1837 (% 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.
1838 )))
1839
1840 (((
1841 [[image:1653360231087-571.png||height="401" width="727"]]
1842 )))
1843
1844 (((
1845 (% 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.
1846 )))
1847
1848 (((
1849 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1850 )))
1851
1852 (((
1853 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1854 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1855 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1856 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1857 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1858 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1859 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1860 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1861 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1862 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1863 )))
1864
1865 (((
1866 As shown in below:
1867 )))
1868
1869 [[image:1653360498588-932.png||height="485" width="726"]]
1870
1871
1872 == 5.4 Can I see counting event in Serial? ==
1873
1874 (((
1875 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.
1876
1877
1878 == 5.5 Can i use point to point communication for LT-22222-L? ==
1879
1880 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1881
1882
1883 )))
1884
1885 (((
1886 = 6. Trouble Shooting =
1887 )))
1888
1889 (((
1890 (((
1891 == 6.1 Downlink doesn’t work, how to solve it? ==
1892 )))
1893 )))
1894
1895 (((
1896 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1897
1898
1899 )))
1900
1901 (((
1902 == 6.2 Have trouble to upload image. ==
1903 )))
1904
1905 (((
1906 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1907 )))
1908
1909 (((
1910
1911 )))
1912
1913 (((
1914 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1915 )))
1916
1917 (((
1918 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1919 )))
1920
1921 (((
1922
1923 )))
1924
1925 (((
1926 = 7. Order Info =
1927 )))
1928
1929 (((
1930 (((
1931 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1932 )))
1933 )))
1934
1935 (((
1936 (((
1937 (% style="color:#4f81bd" %)**XXX:**
1938 )))
1939 )))
1940
1941 (((
1942 * (((
1943 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1944 )))
1945 )))
1946
1947 (((
1948 * (((
1949 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1950 )))
1951 )))
1952
1953 (((
1954 * (((
1955 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1956 )))
1957 )))
1958
1959 (((
1960 * (((
1961 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1962 )))
1963 )))
1964
1965 (((
1966 * (((
1967 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1968 )))
1969 )))
1970
1971 (((
1972 * (((
1973 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1974 )))
1975 )))
1976
1977 (((
1978 * (((
1979 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1980 )))
1981 )))
1982
1983 (((
1984 * (((
1985 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1986 )))
1987 )))
1988
1989 (((
1990 * (((
1991 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1992
1993
1994 )))
1995
1996 = 8. Packing Info =
1997 )))
1998
1999 (((
2000 (((
2001 **Package Includes**:
2002 )))
2003 )))
2004
2005 (((
2006 (((
2007 * LT-22222-L I/O Controller x 1
2008 * Stick Antenna for LoRa RF part x 1
2009 * Bracket for controller x1
2010 * Program cable x 1
2011 )))
2012 )))
2013
2014 (((
2015 (((
2016 **Dimension and weight**:
2017 )))
2018 )))
2019
2020 (((
2021 (((
2022 * Device Size: 13.5 x 7 x 3 cm
2023 * Device Weight: 105g
2024 * Package Size / pcs : 14.5 x 8 x 5 cm
2025 * Weight / pcs : 170g
2026
2027
2028 )))
2029 )))
2030
2031 (((
2032 = 9. Support =
2033 )))
2034
2035 * (((
2036 (((
2037 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.
2038 )))
2039 )))
2040 * (((
2041 (((
2042 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
2043 )))
2044 )))
2045
2046 (((
2047 (((
2048 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2049
2050
2051 )))
2052
2053 (((
2054 = 10. Reference​​​​​ =
2055
2056 * Product Page:
2057
2058 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]]
2059
2060 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2061 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2062 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2063 )))
2064 )))