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Version 77.3 by Xiaoling on 2022/06/10 08:37
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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 == 1.3 Features ==
168
169 * LoRaWAN Class A & Class C protocol
170 * Optional Customized LoRa Protocol
171 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
172 * AT Commands to change parameters
173 * Remote configure parameters via LoRa Downlink
174 * Firmware upgradable via program port
175 * Counting
176
177 == 1.4  Applications ==
178
179 * Smart Buildings & Home Automation
180 * Logistics and Supply Chain Management
181 * Smart Metering
182 * Smart Agriculture
183 * Smart Cities
184 * Smart Factory
185
186 == 1.5 Hardware Variants ==
187
188 (% border="1" style="background-color:#f7faff; width:500px" %)
189 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
190 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
191 * 2 x Digital Input (Bi-direction)
192 * 2 x Digital Output
193 * 2 x Relay Output (5A@250VAC / 30VDC)
194 * 2 x 0~~20mA Analog Input (res:0.01mA)
195 * 2 x 0~~30V Analog Input (res:0.01v)
196 * 1 x Counting Port
197 )))
198
199 = 2. Power ON Device =
200
201 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.
202
203 (((
204 PWR will on when device is properly powered.
205 )))
206
207 [[image:1653297104069-180.png]]
208
209
210 = 3. Operation Mode =
211
212 == 3.1 How it works? ==
213
214 (((
215 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. 
216 )))
217
218 (((
219 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.
220
221
222 )))
223
224 == 3.2 Example to join LoRaWAN network ==
225
226 (((
227 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. 
228 )))
229
230 [[image:image-20220523172350-1.png||height="266" width="864"]]
231
232 (((
233 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:
234 )))
235
236 (((
237 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
238 )))
239
240 (((
241 Each LT is shipped with a sticker with the default device EUI as below:
242 )))
243
244 [[image:1653297924498-393.png]]
245
246 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
247
248 Add APP EUI in the application.
249
250 [[image:1653297955910-247.png||height="321" width="716"]]
251
252
253 Add APP KEY and DEV EUI
254
255 [[image:1653298023685-319.png]]
256
257
258 (((
259 **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.
260 )))
261
262 [[image:1653298044601-602.png||height="405" width="709"]]
263
264
265 == 3.3 Uplink Payload ==
266
267 There are five working modes + one interrupt mode on LT for different type application:
268
269 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
270 * **MOD2**: Double DI Counting + DO + RO
271 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
272 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
273 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
274 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
275
276 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
277
278 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
279
280 [[image:image-20220523174024-3.png]]
281
282 (((
283 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
284 )))
285
286 [[image:image-20220523174254-4.png]]
287
288 * RO is for relay. ROx=1 : close，ROx=0 always open.
289 * DI is for digital input. DIx=1: high or float, DIx=0: low.
290 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
291
292 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
293
294 For example if payload is: [[image:image-20220523175847-2.png]]
295
296 **The value for the interface is:  **
297
298 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
299
300 AVI2 channel voltage is 0x04AC/1000=1.196V
301
302 ACI1 channel current is 0x1310/1000=4.880mA
303
304 ACI2 channel current is 0x1300/1000=4.864mA
305
306 The last byte 0xAA= 10101010(B) means
307
308 * [1] RO1 relay channel is close and the RO1 LED is ON.
309 * [0] RO2 relay channel is open and RO2 LED is OFF;
310
311 **LT22222-L:**
312
313 * [1] DI2 channel is high input and DI2 LED is ON;
314 * [0] DI1 channel is low input;
315
316 * [0] DO3 channel output state
317 ** DO3 is float in case no load between DO3 and V+.;
318 ** DO3 is high in case there is load between DO3 and V+.
319 ** DO3 LED is off in both case
320 * [1] DO2 channel output is low and DO2 LED is ON.
321 * [0] DO1 channel output state
322 ** DO1 is float in case no load between DO1 and V+.;
323 ** DO1 is high in case there is load between DO1 and V+.
324 ** DO1 LED is off in both case
325
326 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
327
328 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
329
330 (((
331 Total : 11 bytes payload
332 )))
333
334 [[image:image-20220523180452-3.png]]
335
336 (((
337 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
338 )))
339
340 [[image:image-20220523180506-4.png]]
341
342 * RO is for relay. ROx=1 : close，ROx=0 always open.
343 * FIRST: Indicate this is the first packet after join network.
344 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
345
346 (((
347 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
348 )))
349
350 (((
351 **To use counting mode, please run:**
352 )))
353
354 (% class="box infomessage" %)
355 (((
356 (((
357 **AT+MOD=2**
358 )))
359 )))
360
361 (% class="box infomessage" %)
362 (((
363 (((
364 **ATZ**
365 )))
366 )))
367
368 (((
369 (% style="color:#4f81bd" %)**AT Commands for counting:**
370 )))
371
372 (((
373 **For LT22222-L:**
374 )))
375
376 (% class="box infomessage" %)
377 (((
378 (((
379 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
380 )))
381 )))
382
383 (% class="box infomessage" %)
384 (((
385 (((
386 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
387 )))
388 )))
389
390 (% class="box infomessage" %)
391 (((
392 (((
393 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
394 )))
395 )))
396
397 (% class="box infomessage" %)
398 (((
399 (((
400 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
401 )))
402 )))
403
404 (% class="box infomessage" %)
405 (((
406 (((
407 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
408 )))
409 )))
410
411 (% class="box infomessage" %)
412 (((
413 (((
414 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
415 )))
416 )))
417
418
419 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
420
421 **LT22222-L**: This mode the DI1 is used as a counting pin.
422
423 [[image:image-20220523181246-5.png]]
424
425 (((
426 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
427 )))
428
429 [[image:image-20220523181301-6.png]]
430
431 * RO is for relay. ROx=1 : close，ROx=0 always open.
432 * FIRST: Indicate this is the first packet after join network.
433 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
434
435 (((
436 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
437 )))
438
439 (((
440 **To use counting mode, please run:**
441 )))
442
443 (% class="box infomessage" %)
444 (((
445 (((
446 **AT+MOD=3**
447 )))
448 )))
449
450 (% class="box infomessage" %)
451 (((
452 (((
453 **ATZ**
454 )))
455 )))
456
457 (((
458 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
459
460
461 )))
462
463 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
464
465 **LT22222-L**: This mode the DI1 is used as a counting pin.
466
467 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.
468
469 [[image:image-20220523181903-8.png]]
470
471 (((
472 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
473 )))
474
475 [[image:image-20220523181727-7.png]]
476
477 * RO is for relay. ROx=1 : close，ROx=0 always open.
478 * FIRST: Indicate this is the first packet after join network.
479 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
480
481 (((
482 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
483 )))
484
485 (((
486 **To use this mode, please run:**
487 )))
488
489 (% class="box infomessage" %)
490 (((
491 (((
492 **AT+MOD=4**
493 )))
494 )))
495
496 (% class="box infomessage" %)
497 (((
498 (((
499 **ATZ**
500 )))
501 )))
502
503 (((
504
505 )))
506
507 (((
508 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
509 )))
510
511 (((
512 **Plus below command for AVI1 Counting:**
513 )))
514
515 (% class="box infomessage" %)
516 (((
517 (((
518 **AT+SETCNT=3,60   (set AVI Count to 60)**
519 )))
520 )))
521
522 (% class="box infomessage" %)
523 (((
524 (((
525 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
526 )))
527 )))
528
529 (% class="box infomessage" %)
530 (((
531 (((
532 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
533 )))
534 )))
535
536 (% class="box infomessage" %)
537 (((
538 (((
539 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
540 )))
541 )))
542
543
544 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
545
546 **LT22222-L**: This mode the DI1 is used as a counting pin.
547
548 [[image:image-20220523182334-9.png]]
549
550 (((
551 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
552 )))
553
554 * RO is for relay. ROx=1 : close，ROx=0 always open.
555 * FIRST: Indicate this is the first packet after join network.
556 * (((
557 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
558 )))
559
560 (((
561 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
562 )))
563
564 (((
565 **To use this mode, please run:**
566 )))
567
568 (% class="box infomessage" %)
569 (((
570 (((
571 **AT+MOD=5**
572 )))
573 )))
574
575 (% class="box infomessage" %)
576 (((
577 (((
578 **ATZ**
579 )))
580 )))
581
582 (((
583 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
584
585
586 )))
587
588 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
589
590 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
591
592 For example, if user has configured below commands:
593
594 * **AT+MOD=1 ** **~-~->** The normal working mode
595 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
596
597 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
598
599 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
600 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.**
601
602 **AT Command to set Trigger Condition**:
603
604 (% style="color:#4f81bd" %)**Trigger base on voltage**:
605
606 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
607
608 **Example:**
609
610 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)
611
612 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
613
614
615 (% style="color:#4f81bd" %)**Trigger base on current**:
616
617 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
618
619 **Example:**
620
621 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
622
623
624 (% style="color:#4f81bd" %)**Trigger base on DI status**:
625
626 DI status trigger Flag.
627
628 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
629
630 **Example:**
631
632 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
633
634
635 **Downlink Command to set Trigger Condition**
636
637 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
638
639 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
640
641 AA: Code for this downlink Command:
642
643 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
644
645 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
646
647 yy2 yy2: AC1 or AV1 high limit.
648
649 yy3 yy3: AC2 or AV2 low limit.
650
651 Yy4 yy4: AC2 or AV2 high limit.
652
653 **Example1**: AA 00 13 88 00 00 00 00 00 00
654
655 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
656
657 **Example2**: AA 02 01 00
658
659 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
660
661 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
662
663 MOD6 Payload : total 11 bytes payload
664
665 [[image:image-20220524085923-1.png]]
666
667 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
668
669 [[image:image-20220524090106-2.png]]
670
671 * Each bits shows if the corresponding trigger has been configured.
672
673 **Example:**
674
675 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
676
677
678 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
679
680 [[image:image-20220524090249-3.png]]
681
682 * Each bits shows which status has been trigger on this uplink.
683
684 **Example:**
685
686 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
687
688
689 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
690
691 [[image:image-20220524090456-4.png]]
692
693 * Each bits shows which status has been trigger on this uplink.
694
695 **Example:**
696
697 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
698
699 00000101: Means both DI1 and DI2 trigger are enabled.
700
701
702 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
703
704 Downlink command to poll MOD6 status:
705
706 **AB 06**
707
708 When device got this command, it will send the MOD6 payload.
709
710
711 === 3.3.7 Payload Decoder ===
712
713 (((
714 **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/]]
715
716
717 )))
718
719 == 3.4 ​Configure LT via AT or Downlink ==
720
721 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
722
723 (((
724 There are two kinds of Commands:
725 )))
726
727 * (% 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]]
728
729 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
730
731 === 3.4.1 Common Commands ===
732
733 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]]
734
735
736 === 3.4.2 Sensor related commands ===
737
738 ==== 3.4.2.1 Set Transmit Interval ====
739
740 Set device uplink interval.
741
742 * AT Command:
743
744 (% class="box infomessage" %)
745 (((
746 **AT+TDC=N **
747 )))
748
749 **Example: **AT+TDC=30000. Means set interval to 30 seconds
750
751 * Downlink Payload (prefix 0x01):
752
753 (% class="box infomessage" %)
754 (((
755 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
756 )))
757
758
759 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
760
761 Set work mode.
762
763 * AT Command:
764
765 (% class="box infomessage" %)
766 (((
767 **AT+MOD=N  **
768 )))
769
770 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
771
772 * Downlink Payload (prefix 0x0A):
773
774 (% class="box infomessage" %)
775 (((
776 **0x0A aa     ~/~/ Same as AT+MOD=aa**
777 )))
778
779
780 ==== 3.4.2.3 Poll an uplink ====
781
782 * AT Command:
783
784 There is no AT Command to poll uplink
785
786 * Downlink Payload (prefix 0x08):
787
788 (% class="box infomessage" %)
789 (((
790 **0x08 FF     ~/~/ Poll an uplink,**
791 )))
792
793 **Example**: 0x08FF, ask device to send an Uplink
794
795
796 ==== 3.4.2.4 Enable Trigger Mode ====
797
798 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
799
800 * AT Command:
801
802 (% class="box infomessage" %)
803 (((
804 **AT+ADDMOD6=1 or 0**
805 )))
806
807 1: Enable Trigger Mode
808
809 0: Disable Trigger Mode
810
811 * Downlink Payload (prefix 0x0A 06):
812
813 (% class="box infomessage" %)
814 (((
815 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
816 )))
817
818
819 ==== 3.4.2.5 Poll trigger settings ====
820
821 Poll trigger settings,
822
823 * AT Command:
824
825 There is no AT Command for this feature.
826
827 * Downlink Payload (prefix 0x AB 06):
828
829 (% class="box infomessage" %)
830 (((
831 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
832 )))
833
834
835 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
836
837 Enable Disable DI1/DI2/DI2 as trigger,
838
839 * AT Command:
840
841 (% class="box infomessage" %)
842 (((
843 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
844 )))
845
846 **Example:**
847
848 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
849
850 * Downlink Payload (prefix 0xAA 02):
851
852 (% class="box infomessage" %)
853 (((
854 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
855 )))
856
857
858 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
859
860 Set DI1 or DI3(for LT-33222-L) trigger.
861
862 * AT Command:
863
864 (% class="box infomessage" %)
865 (((
866 **AT+TRIG1=a,b**
867 )))
868
869 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
870
871 b : delay timing.
872
873 **Example:**
874
875 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
876
877 * Downlink Payload (prefix 0x09 01 ):
878
879 (% class="box infomessage" %)
880 (((
881 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
882 )))
883
884
885 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
886
887 Set DI2 trigger.
888
889 * AT Command:
890
891 (% class="box infomessage" %)
892 (((
893 **AT+TRIG2=a,b**
894 )))
895
896 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
897
898 b : delay timing.
899
900 **Example:**
901
902 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
903
904 * Downlink Payload (prefix 0x09 02 ):
905
906 (% class="box infomessage" %)
907 (((
908 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
909 )))
910
911
912 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
913
914 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
915
916 * AT Command:
917
918 (% class="box infomessage" %)
919 (((
920 **AT+ACLIM. **
921 )))
922
923 * Downlink Payload (prefix 0xAA 01 ):
924
925 (% class="box infomessage" %)
926 (((
927 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
928 )))
929
930
931 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
932
933 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
934
935 * AT Command:
936
937 (% class="box infomessage" %)
938 (((
939 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
940 )))
941
942 * Downlink Payload (prefix 0xAA 00 ):
943
944 (% class="box infomessage" %)
945 (((
946 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
947 )))
948
949
950 ==== 3.4.2.11 Trigger – Set minimum interval ====
951
952 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
953
954 * AT Command:
955
956 (% class="box infomessage" %)
957 (((
958 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
959 )))
960
961 * Downlink Payload (prefix 0xAC ):
962
963 (% class="box infomessage" %)
964 (((
965 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
966 )))
967
968
969 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
970
971 * AT Command:
972
973 There is no AT Command to control Digital Output
974
975 * Downlink Payload (prefix 0x02):
976
977 (% class="box infomessage" %)
978 (((
979 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
980 )))
981
982 (((
983 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
984 )))
985
986 (((
987 01: Low,  00: High ,  11: No action
988 )))
989
990 [[image:image-20220524092754-5.png]]
991
992 (((
993 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
994 )))
995
996 (((
997 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
998 )))
999
1000
1001 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1002
1003 * AT Command:
1004
1005 There is no AT Command to control Digital Output
1006
1007 * Downlink Payload (prefix 0xA9):
1008
1009 (% class="box infomessage" %)
1010 (((
1011 (((
1012 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1013 )))
1014 )))
1015
1016 This is to control the digital output time of DO pin. Include four bytes:
1017
1018 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1019
1020 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1021
1022 01: DO pins will change back to original state after timeout.
1023
1024 00: DO pins will change to an inverter state after timeout 
1025
1026 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1027
1028 [[image:image-20220524093238-6.png]]
1029
1030 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1031
1032 [[image:image-20220524093328-7.png]]
1033
1034 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1035
1036 [[image:image-20220524093351-8.png]]
1037
1038 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1039
1040 Latching time. Unit: ms
1041
1042 Device will upload a packet if downlink code executes successfully.
1043
1044 **Example payload:**
1045
1046 **~1. A9 01 01 01 01 07 D0**
1047
1048 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1049
1050 **2. A9 01 00 01 11 07 D0**
1051
1052 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1053
1054 **3. A9 00 00 00 00 07 D0**
1055
1056 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1057
1058 **4. A9 00 11 01 00 07 D0**
1059
1060 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
1061
1062
1063 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1064
1065 * AT Command:
1066
1067 There is no AT Command to control Relay Output
1068
1069 * Downlink Payload (prefix 0x03):
1070
1071 (% class="box infomessage" %)
1072 (((
1073 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1074 )))
1075
1076 (((
1077 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1078 )))
1079
1080 (((
1081 01: Close ,  00: Open , 11: No action
1082 )))
1083
1084 (((
1085 [[image:image-20220524093724-9.png]]
1086 )))
1087
1088 Device will upload a packet if downlink code executes successfully.
1089
1090
1091 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1092
1093 * AT Command:
1094
1095 There is no AT Command to control Relay Output
1096
1097 * Downlink Payload (prefix 0x05):
1098
1099 (% class="box infomessage" %)
1100 (((
1101 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1102 )))
1103
1104 This is to control the relay output time of relay. Include four bytes:
1105
1106 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1107
1108 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1109
1110 01: Relays will change back to original state after timeout.
1111
1112 00: Relays will change to an inverter state after timeout
1113
1114 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1115
1116 [[image:image-20220524093831-10.png]]
1117
1118 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1119
1120 Device will upload a packet if downlink code executes successfully.
1121
1122 **Example payload:**
1123
1124 **~1. 05 01 11 07 D0**
1125
1126 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1127
1128 **2. 05 01 10 07 D0**
1129
1130 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1131
1132 **3. 05 00 01 07 D0**
1133
1134 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1135
1136 **4. 05 00 00 07 D0**
1137
1138 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1139
1140
1141 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1142
1143 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1144
1145 * AT Command:
1146
1147 (% class="box infomessage" %)
1148 (((
1149 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1150 )))
1151
1152 * Downlink Payload (prefix 0xA5):
1153
1154 (% class="box infomessage" %)
1155 (((
1156 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1157 )))
1158
1159
1160 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1161
1162 * AT Command:
1163
1164 (% class="box infomessage" %)
1165 (((
1166 **AT+SETCNT=aa,(bb cc dd ee) **
1167 )))
1168
1169 aa: 1: Set count1,
1170
1171 2: Set count2,
1172
1173 3: Set AV1 count
1174
1175 Bb cc dd ee: number to be set
1176
1177 * Downlink Payload (prefix 0xA8):
1178
1179 (% class="box infomessage" %)
1180 (((
1181 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1182 )))
1183
1184
1185 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1186
1187 Clear counting for counting mode
1188
1189 * AT Command:
1190
1191 (% class="box infomessage" %)
1192 (((
1193 **AT+CLRCOUNT ~/~/ clear all counting**
1194 )))
1195
1196 * Downlink Payload (prefix 0xA6):
1197
1198 (% class="box infomessage" %)
1199 (((
1200 **0x A6 01     ~/~/ clear all counting,**
1201 )))
1202
1203
1204 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1205
1206 * AT Command:
1207
1208 (% class="box infomessage" %)
1209 (((
1210 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1211 )))
1212
1213 * Downlink Payload (prefix 0xA7):
1214
1215 (% class="box infomessage" %)
1216 (((
1217 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1218 )))
1219
1220 (((
1221 range: aa bb cc:0 to 16777215,  (unit:second)
1222
1223
1224 )))
1225
1226 == 3.5 Integrate with Mydevice ==
1227
1228 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:
1229
1230 (((
1231 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1232 )))
1233
1234 (((
1235 **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:
1236 )))
1237
1238 [[image:1653356737703-362.png||height="232" width="732"]]
1239
1240 [[image:image-20220524094641-11.png||height="390" width="723"]]
1241
1242 [[image:image-20220524094641-12.png||height="402" width="718"]]
1243
1244
1245 **Step 3**: Create an account or log in Mydevices.
1246
1247 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1248
1249 Search under The things network
1250
1251 [[image:1653356838789-523.png||height="337" width="740"]]
1252
1253
1254 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1255
1256 [[image:image-20220524094909-1.png||height="335" width="729"]]
1257
1258 [[image:image-20220524094909-2.png||height="337" width="729"]]
1259
1260 [[image:image-20220524094909-3.png||height="338" width="727"]]
1261
1262 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1263
1264 [[image:image-20220524094909-5.png||height="341" width="734"]]
1265
1266
1267 == 3.6 Interface Detail ==
1268
1269 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1270
1271 Support NPN Type sensor
1272
1273 [[image:1653356991268-289.png]]
1274
1275
1276 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1277
1278 (((
1279 The DI port of LT-22222-L can support NPN or PNP output sensor.
1280 )))
1281
1282 (((
1283 (((
1284 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
1285 )))
1286 )))
1287
1288 [[image:1653357170703-587.png]]
1289
1290 (((
1291 (((
1292 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1293 )))
1294 )))
1295
1296 (((
1297
1298 )))
1299
1300 (((
1301 **Example1**: Connect to a Low active sensor.
1302 )))
1303
1304 (((
1305 This type of sensor will output a low signal GND when active.
1306 )))
1307
1308 * (((
1309 Connect sensor’s output to DI1-
1310 )))
1311 * (((
1312 Connect sensor’s VCC to DI1+.
1313 )))
1314
1315 (((
1316 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1317 )))
1318
1319 (((
1320 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1321 )))
1322
1323 (((
1324 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.
1325 )))
1326
1327 (((
1328
1329 )))
1330
1331 (((
1332 **Example2**: Connect to a High active sensor.
1333 )))
1334
1335 (((
1336 This type of sensor will output a high signal (example 24v) when active.
1337 )))
1338
1339 * (((
1340 Connect sensor’s output to DI1+
1341 )))
1342 * (((
1343 Connect sensor’s GND DI1-.
1344 )))
1345
1346 (((
1347 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1348 )))
1349
1350 (((
1351 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1352 )))
1353
1354 (((
1355 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.
1356 )))
1357
1358 (((
1359
1360 )))
1361
1362 (((
1363 **Example3**: Connect to a 220v high active sensor.
1364 )))
1365
1366 (((
1367 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1368 )))
1369
1370 * (((
1371 Connect sensor’s output to DI1+ with a serial 50K resistor
1372 )))
1373 * (((
1374 Connect sensor’s GND DI1-.
1375 )))
1376
1377 (((
1378 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1379 )))
1380
1381 (((
1382 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1383 )))
1384
1385 (((
1386 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.
1387 )))
1388
1389
1390 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1391
1392 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1393
1394 [[image:1653357531600-905.png]]
1395
1396
1397 === 3.6.4 Analog Input Interface ===
1398
1399 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:
1400
1401 **AC2 = (IN2 voltage )/12**
1402
1403 [[image:1653357592296-182.png]]
1404
1405 Example to connect a 4~~20mA sensor
1406
1407 We take the wind speed sensor as an example for reference only.
1408
1409 Specifications of the wind speed sensor:
1410
1411 Red:12~~24v
1412
1413 Yellow:4~~20mA
1414
1415 Black:GND
1416
1417
1418 Connection diagram:
1419
1420 [[image:1653357640609-758.png]]
1421
1422 [[image:1653357648330-671.png||height="155" width="733"]]
1423
1424
1425 === 3.6.5 Relay Output ===
1426
1427 (((
1428 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:
1429 )))
1430
1431 [[image:image-20220524100215-9.png]]
1432
1433 [[image:image-20220524100215-10.png||height="382" width="723"]]
1434
1435
1436 == 3.7 LEDs Indicators ==
1437
1438 [[image:image-20220524100748-11.png]]
1439
1440
1441 = 4. Use AT Command =
1442
1443 == 4.1 Access AT Command ==
1444
1445 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.
1446
1447 [[image:1653358238933-385.png]]
1448
1449 (((
1450 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:
1451 )))
1452
1453 [[image:1653358355238-883.png]]
1454
1455 (((
1456 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/]]
1457 )))
1458
1459 (((
1460 AT+<CMD>?        : Help on <CMD>
1461 )))
1462
1463 (((
1464 AT+<CMD>         : Run <CMD>
1465 )))
1466
1467 (((
1468 AT+<CMD>=<value> : Set the value
1469 )))
1470
1471 (((
1472 AT+<CMD>=?       : Get the value
1473 )))
1474
1475 (((
1476 ATZ: Trig a reset of the MCU
1477 )))
1478
1479 (((
1480 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1481 )))
1482
1483 (((
1484 AT+DEUI: Get or Set the Device EUI
1485 )))
1486
1487 (((
1488 AT+DADDR: Get or Set the Device Address
1489 )))
1490
1491 (((
1492 AT+APPKEY: Get or Set the Application Key
1493 )))
1494
1495 (((
1496 AT+NWKSKEY: Get or Set the Network Session Key
1497 )))
1498
1499 (((
1500 AT+APPSKEY: Get or Set the Application Session Key
1501 )))
1502
1503 (((
1504 AT+APPEUI: Get or Set the Application EUI
1505 )))
1506
1507 (((
1508 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1509 )))
1510
1511 (((
1512 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1513 )))
1514
1515 (((
1516 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1517 )))
1518
1519 (((
1520 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1521 )))
1522
1523 (((
1524 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1525 )))
1526
1527 (((
1528 AT+RX2FQ: Get or Set the Rx2 window frequency
1529 )))
1530
1531 (((
1532 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1533 )))
1534
1535 (((
1536 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1537 )))
1538
1539 (((
1540 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1541 )))
1542
1543 (((
1544 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1545 )))
1546
1547 (((
1548 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1549 )))
1550
1551 (((
1552 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1553 )))
1554
1555 (((
1556 AT+NWKID: Get or Set the Network ID
1557 )))
1558
1559 (((
1560 AT+FCU: Get or Set the Frame Counter Uplink
1561 )))
1562
1563 (((
1564 AT+FCD: Get or Set the Frame Counter Downlink
1565 )))
1566
1567 (((
1568 AT+CLASS: Get or Set the Device Class
1569 )))
1570
1571 (((
1572 AT+JOIN: Join network
1573 )))
1574
1575 (((
1576 AT+NJS: Get OTAA Join Status
1577 )))
1578
1579 (((
1580 AT+SENDB: Send hexadecimal data along with the application port
1581 )))
1582
1583 (((
1584 AT+SEND: Send text data along with the application port
1585 )))
1586
1587 (((
1588 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1589 )))
1590
1591 (((
1592 AT+RECV: Print last received data in raw format
1593 )))
1594
1595 (((
1596 AT+VER: Get current image version and Frequency Band
1597 )))
1598
1599 (((
1600 AT+CFM: Get or Set the confirmation mode (0-1)
1601 )))
1602
1603 (((
1604 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1605 )))
1606
1607 (((
1608 AT+SNR: Get the SNR of the last received packet
1609 )))
1610
1611 (((
1612 AT+RSSI: Get the RSSI of the last received packet
1613 )))
1614
1615 (((
1616 AT+TDC: Get or set the application data transmission interval in ms
1617 )))
1618
1619 (((
1620 AT+PORT: Get or set the application port
1621 )))
1622
1623 (((
1624 AT+DISAT: Disable AT commands
1625 )))
1626
1627 (((
1628 AT+PWORD: Set password, max 9 digits
1629 )))
1630
1631 (((
1632 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1633 )))
1634
1635 (((
1636 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1637 )))
1638
1639 (((
1640 AT+CFG: Print all settings
1641
1642
1643 )))
1644
1645 == 4.2 Common AT Command Sequence ==
1646
1647 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1648
1649 (((
1650 If device has not joined network yet:
1651 )))
1652
1653 (((
1654 (% style="background-color:#dcdcdc" %)123456
1655 )))
1656
1657 (((
1658 (% style="background-color:#dcdcdc" %)AT+FDR
1659 )))
1660
1661 (((
1662 (% style="background-color:#dcdcdc" %)123456
1663 )))
1664
1665 (((
1666 (% style="background-color:#dcdcdc" %)AT+NJM=0
1667 )))
1668
1669 (((
1670 (% style="background-color:#dcdcdc" %)ATZ
1671 )))
1672
1673
1674 (((
1675 If device already joined network:
1676 )))
1677
1678 (((
1679 (% style="background-color:#dcdcdc" %)AT+NJM=0
1680 )))
1681
1682 (((
1683 (% style="background-color:#dcdcdc" %)ATZ
1684
1685
1686 )))
1687
1688 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1689
1690 (((
1691 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1692 )))
1693
1694 (((
1695 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1696 )))
1697
1698 (((
1699 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1700 )))
1701
1702 (((
1703 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1704 )))
1705
1706 (((
1707 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1708 )))
1709
1710 (((
1711 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1712 )))
1713
1714 (((
1715 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1716 )))
1717
1718 (((
1719 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1720 )))
1721
1722 (((
1723 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1724 )))
1725
1726 (((
1727 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1728 )))
1729
1730 (((
1731 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1732 )))
1733
1734 (((
1735 (% 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.
1736 )))
1737
1738 (((
1739 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1740 )))
1741
1742 (((
1743 (% style="color:red" %)**Note:**
1744 )))
1745
1746 (((
1747 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1748 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1749 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.
1750 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
1751 )))
1752
1753 (((
1754 [[image:1653359097980-169.png||height="188" width="729"]]
1755 )))
1756
1757 (((
1758
1759 )))
1760
1761 === 4.2.3 Change to Class A ===
1762
1763 If sensor JOINED
1764 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1765 ATZ
1766
1767
1768 = 5. FAQ =
1769
1770 == 5.1 How to upgrade the image? ==
1771
1772 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1773
1774 * Support new features
1775 * For bug fix
1776 * Change LoRaWAN bands.
1777 Below shows the hardware connection for how to upload an image to the LT:
1778 * [[image:1653359603330-121.png]]
1779
1780 (((
1781 **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]].
1782 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1783 **Step3: **Open flashloader; choose the correct COM port to update.
1784 **For LT-22222-L**:
1785 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.
1786 )))
1787
1788 [[image:image-20220524103407-12.png]]
1789
1790 [[image:image-20220524103429-13.png]]
1791
1792 [[image:image-20220524104033-15.png]]
1793
1794 (% 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:
1795
1796 [[image:1653360054704-518.png||height="186" width="745"]]
1797
1798
1799 (((
1800 (((
1801 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1802 )))
1803 )))
1804
1805 (((
1806 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1807
1808
1809 )))
1810
1811 (((
1812 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1813 )))
1814
1815 (((
1816 (((
1817 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1818 )))
1819 )))
1820
1821 (((
1822 (((
1823 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1824 )))
1825 )))
1826
1827 (((
1828 (% 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.
1829 )))
1830
1831 (((
1832 [[image:1653360231087-571.png||height="401" width="727"]]
1833 )))
1834
1835 (((
1836 (% 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.
1837 )))
1838
1839 (((
1840 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1841 )))
1842
1843 (((
1844 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1845 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1846 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1847 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1848 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1849 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1850 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1851 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1852 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1853 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1854 )))
1855
1856 (((
1857 As shown in below:
1858 )))
1859
1860 [[image:1653360498588-932.png||height="485" width="726"]]
1861
1862
1863 == 5.4 Can I see counting event in Serial? ==
1864
1865 (((
1866 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.
1867
1868
1869 == 5.5 Can i use point to point communication for LT-22222-L? ==
1870
1871 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1872
1873
1874 )))
1875
1876 (((
1877 = 6. Trouble Shooting =
1878 )))
1879
1880 (((
1881 (((
1882 == 6.1 Downlink doesn’t work, how to solve it? ==
1883 )))
1884 )))
1885
1886 (((
1887 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1888
1889
1890 )))
1891
1892 (((
1893 == 6.2 Have trouble to upload image. ==
1894 )))
1895
1896 (((
1897 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1898 )))
1899
1900 (((
1901
1902 )))
1903
1904 (((
1905 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1906 )))
1907
1908 (((
1909 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1910 )))
1911
1912 (((
1913
1914 )))
1915
1916 (((
1917 = 7. Order Info =
1918 )))
1919
1920 (((
1921 (((
1922 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1923 )))
1924 )))
1925
1926 (((
1927 (((
1928 (% style="color:#4f81bd" %)**XXX:**
1929 )))
1930 )))
1931
1932 (((
1933 * (((
1934 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1935 )))
1936 )))
1937
1938 (((
1939 * (((
1940 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1941 )))
1942 )))
1943
1944 (((
1945 * (((
1946 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1947 )))
1948 )))
1949
1950 (((
1951 * (((
1952 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1953 )))
1954 )))
1955
1956 (((
1957 * (((
1958 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1959 )))
1960 )))
1961
1962 (((
1963 * (((
1964 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1965 )))
1966 )))
1967
1968 (((
1969 * (((
1970 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1971 )))
1972 )))
1973
1974 (((
1975 * (((
1976 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1977 )))
1978 )))
1979
1980 (((
1981 * (((
1982 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1983
1984
1985 )))
1986
1987 = 8. Packing Info =
1988 )))
1989
1990 (((
1991 (((
1992 **Package Includes**:
1993 )))
1994 )))
1995
1996 (((
1997 (((
1998 * LT-22222-L I/O Controller x 1
1999 * Stick Antenna for LoRa RF part x 1
2000 * Bracket for controller x1
2001 * Program cable x 1
2002 )))
2003 )))
2004
2005 (((
2006 (((
2007 **Dimension and weight**:
2008 )))
2009 )))
2010
2011 (((
2012 (((
2013 * Device Size: 13.5 x 7 x 3 cm
2014 * Device Weight: 105g
2015 * Package Size / pcs : 14.5 x 8 x 5 cm
2016 * Weight / pcs : 170g
2017
2018
2019 )))
2020 )))
2021
2022 (((
2023 = 9. Support =
2024 )))
2025
2026 * (((
2027 (((
2028 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.
2029 )))
2030 )))
2031 * (((
2032 (((
2033 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
2034 )))
2035 )))
2036
2037 (((
2038 (((
2039 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2040
2041
2042 )))
2043
2044 (((
2045 = 10. Reference​​​​​ =
2046
2047 * Product Page:
2048
2049 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]]
2050
2051 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2052 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2053 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2054 )))
2055 )))