Version 77.40 by Xiaoling on 2022/06/10 08:59
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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 **Interface for Model: LT22222-L:**
80 )))
81
82 * (((
83 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
84 )))
85 * (((
86 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
87 )))
88 * (((
89 2 x Relay Output (5A@250VAC / 30VDC)
90 )))
91 * (((
92 2 x 0~~20mA Analog Input (res:0.01mA)
93 )))
94 * (((
95 2 x 0~~30V Analog Input (res:0.01v)
96 )))
97 * (((
98 Power Input 7~~ 24V DC. 
99 )))
100
101 (((
102 **LoRa Spec:**
103 )))
104
105 * (((
106 (((
107 Frequency Range:
108 )))
109
110 * (((
111 Band 1 (HF): 862 ~~ 1020 Mhz
112 )))
113 * (((
114 Band 2 (LF): 410 ~~ 528 Mhz
115 )))
116 )))
117 * (((
118 168 dB maximum link budget.
119 )))
120 * (((
121 +20 dBm - 100 mW constant RF output vs.
122 )))
123 * (((
124 +14 dBm high efficiency PA.
125 )))
126 * (((
127 Programmable bit rate up to 300 kbps.
128 )))
129 * (((
130 High sensitivity: down to -148 dBm.
131 )))
132 * (((
133 Bullet-proof front end: IIP3 = -12.5 dBm.
134 )))
135 * (((
136 Excellent blocking immunity.
137 )))
138 * (((
139 Low RX current of 10.3 mA, 200 nA register retention.
140 )))
141 * (((
142 Fully integrated synthesizer with a resolution of 61 Hz.
143 )))
144 * (((
145 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
146 )))
147 * (((
148 Built-in bit synchronizer for clock recovery.
149 )))
150 * (((
151 Preamble detection.
152 )))
153 * (((
154 127 dB Dynamic Range RSSI.
155 )))
156 * (((
157 Automatic RF Sense and CAD with ultra-fast AFC.
158 )))
159 * (((
160 Packet engine up to 256 bytes with CRC.
161
162
163 )))
164
165
166 == 1.3 Features ==
167
168 * LoRaWAN Class A & Class C protocol
169 * Optional Customized LoRa Protocol
170 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
171 * AT Commands to change parameters
172 * Remote configure parameters via LoRa Downlink
173 * Firmware upgradable via program port
174 * Counting
175
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
187 == 1.5 Hardware Variants ==
188
189 (% border="1" style="background-color:#f7faff; width:500px" %)
190 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
191 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
192 * 2 x Digital Input (Bi-direction)
193 * 2 x Digital Output
194 * 2 x Relay Output (5A@250VAC / 30VDC)
195 * 2 x 0~~20mA Analog Input (res:0.01mA)
196 * 2 x 0~~30V Analog Input (res:0.01v)
197 * 1 x Counting Port
198 )))
199
200
201 = 2. Power ON Device =
202
203 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.
204
205 (((
206 PWR will on when device is properly powered.
207 )))
208
209 [[image:1653297104069-180.png]]
210
211
212
213 = 3. Operation Mode =
214
215 == 3.1 How it works? ==
216
217 (((
218 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. 
219 )))
220
221 (((
222 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.
223
224
225 )))
226
227
228
229 == 3.2 Example to join LoRaWAN network ==
230
231 (((
232 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. 
233 )))
234
235 [[image:image-20220523172350-1.png||height="266" width="864"]]
236
237 (((
238 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:
239 )))
240
241 (((
242 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
243 )))
244
245 (((
246 Each LT is shipped with a sticker with the default device EUI as below:
247 )))
248
249 [[image:1653297924498-393.png]]
250
251 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
252
253 Add APP EUI in the application.
254
255 [[image:1653297955910-247.png||height="321" width="716"]]
256
257
258 Add APP KEY and DEV EUI
259
260 [[image:1653298023685-319.png]]
261
262
263 (((
264 **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.
265 )))
266
267 [[image:1653298044601-602.png||height="405" width="709"]]
268
269
270
271 == 3.3 Uplink Payload ==
272
273 There are five working modes + one interrupt mode on LT for different type application:
274
275 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
276 * **MOD2**: Double DI Counting + DO + RO
277 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
278 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
279 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
280 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
281
282
283 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
284
285 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
286
287 [[image:image-20220523174024-3.png]]
288
289 (((
290 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
291 )))
292
293 [[image:image-20220523174254-4.png]]
294
295 * RO is for relay. ROx=1 : close，ROx=0 always open.
296 * DI is for digital input. DIx=1: high or float, DIx=0: low.
297 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
298
299 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
300
301 For example if payload is: [[image:image-20220523175847-2.png]]
302
303 **The value for the interface is:  **
304
305 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
306
307 AVI2 channel voltage is 0x04AC/1000=1.196V
308
309 ACI1 channel current is 0x1310/1000=4.880mA
310
311 ACI2 channel current is 0x1300/1000=4.864mA
312
313 The last byte 0xAA= 10101010(B) means
314
315 * [1] RO1 relay channel is close and the RO1 LED is ON.
316 * [0] RO2 relay channel is open and RO2 LED is OFF;
317
318 **LT22222-L:**
319
320 * [1] DI2 channel is high input and DI2 LED is ON;
321 * [0] DI1 channel is low input;
322
323 * [0] DO3 channel output state
324 ** DO3 is float in case no load between DO3 and V+.;
325 ** DO3 is high in case there is load between DO3 and V+.
326 ** DO3 LED is off in both case
327 * [1] DO2 channel output is low and DO2 LED is ON.
328 * [0] DO1 channel output state
329 ** DO1 is float in case no load between DO1 and V+.;
330 ** DO1 is high in case there is load between DO1 and V+.
331 ** DO1 LED is off in both case
332
333
334 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
335
336 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
337
338 (((
339 Total : 11 bytes payload
340 )))
341
342 [[image:image-20220523180452-3.png]]
343
344 (((
345 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
346 )))
347
348 [[image:image-20220523180506-4.png]]
349
350 * RO is for relay. ROx=1 : close，ROx=0 always open.
351 * FIRST: Indicate this is the first packet after join network.
352 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
353
354 (((
355 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
356 )))
357
358 (((
359 **To use counting mode, please run:**
360 )))
361
362 (% class="box infomessage" %)
363 (((
364 (((
365 **AT+MOD=2**
366 )))
367 )))
368
369 (% class="box infomessage" %)
370 (((
371 (((
372 **ATZ**
373 )))
374 )))
375
376 (((
377 (% style="color:#4f81bd" %)**AT Commands for counting:**
378 )))
379
380 (((
381 **For LT22222-L:**
382 )))
383
384 (% class="box infomessage" %)
385 (((
386 (((
387 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
388 )))
389 )))
390
391 (% class="box infomessage" %)
392 (((
393 (((
394 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
395 )))
396 )))
397
398 (% class="box infomessage" %)
399 (((
400 (((
401 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
402 )))
403 )))
404
405 (% class="box infomessage" %)
406 (((
407 (((
408 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
409 )))
410 )))
411
412 (% class="box infomessage" %)
413 (((
414 (((
415 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
416 )))
417 )))
418
419 (% class="box infomessage" %)
420 (((
421 (((
422 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
423 )))
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
473
474 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
475
476 **LT22222-L**: This mode the DI1 is used as a counting pin.
477
478 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.
479
480 [[image:image-20220523181903-8.png]]
481
482 (((
483 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
484 )))
485
486 [[image:image-20220523181727-7.png]]
487
488 * RO is for relay. ROx=1 : close，ROx=0 always open.
489 * FIRST: Indicate this is the first packet after join network.
490 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
491
492 (((
493 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
494 )))
495
496 (((
497 **To use this mode, please run:**
498 )))
499
500 (% class="box infomessage" %)
501 (((
502 (((
503 **AT+MOD=4**
504 )))
505 )))
506
507 (% class="box infomessage" %)
508 (((
509 (((
510 **ATZ**
511 )))
512 )))
513
514 (((
515
516 )))
517
518 (((
519 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
520 )))
521
522 (((
523 **Plus below command for AVI1 Counting:**
524 )))
525
526 (% class="box infomessage" %)
527 (((
528 (((
529 **AT+SETCNT=3,60   (set AVI Count to 60)**
530 )))
531 )))
532
533 (% class="box infomessage" %)
534 (((
535 (((
536 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
537 )))
538 )))
539
540 (% class="box infomessage" %)
541 (((
542 (((
543 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
544 )))
545 )))
546
547 (% class="box infomessage" %)
548 (((
549 (((
550 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
551 )))
552 )))
553
554
555
556 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
557
558 **LT22222-L**: This mode the DI1 is used as a counting pin.
559
560 [[image:image-20220523182334-9.png]]
561
562 (((
563 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
564 )))
565
566 * RO is for relay. ROx=1 : close，ROx=0 always open.
567 * FIRST: Indicate this is the first packet after join network.
568 * (((
569 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
570 )))
571
572 (((
573 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
574 )))
575
576 (((
577 **To use this mode, please run:**
578 )))
579
580 (% class="box infomessage" %)
581 (((
582 (((
583 **AT+MOD=5**
584 )))
585 )))
586
587 (% class="box infomessage" %)
588 (((
589 (((
590 **ATZ**
591 )))
592 )))
593
594 (((
595 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
596
597
598 )))
599
600
601
602 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
603
604 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
605
606 For example, if user has configured below commands:
607
608 * **AT+MOD=1 ** **~-~->** The normal working mode
609 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
610
611 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
612
613 1. Periodically uplink (Base on TDC time). Payload is same as the normal MOD (MOD 1 for above command). This uplink uses LoRaWAN (% style="color:#4f81bd" %)**unconfirmed**(%%) data type
614 1. Trigger uplink when meet the trigger condition. LT will sent two packets in this case, the first uplink use payload specify in this mod (mod=6), the second packets use the normal mod payload(MOD=1 for above settings). Both Uplinks use LoRaWAN (% style="color:#4f81bd" %)**CONFIRMED data type.**
615
616 **AT Command to set Trigger Condition**:
617
618 (% style="color:#4f81bd" %)**Trigger base on voltage**:
619
620 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
621
622 **Example:**
623
624 AT+AVLIM=3000,6000,0,2000   (If AVI1 voltage lower than 3v or higher than 6v. or AV2 voltage is higher than 2v, LT will trigger Uplink)
625
626 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
627
628
629 (% style="color:#4f81bd" %)**Trigger base on current**:
630
631 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
632
633 **Example:**
634
635 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
636
637
638 (% style="color:#4f81bd" %)**Trigger base on DI status**:
639
640 DI status trigger Flag.
641
642 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
643
644 **Example:**
645
646 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
647
648
649 **Downlink Command to set Trigger Condition**
650
651 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
652
653 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
654
655 AA: Code for this downlink Command:
656
657 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
658
659 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
660
661 yy2 yy2: AC1 or AV1 high limit.
662
663 yy3 yy3: AC2 or AV2 low limit.
664
665 Yy4 yy4: AC2 or AV2 high limit.
666
667 **Example1**: AA 00 13 88 00 00 00 00 00 00
668
669 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
670
671 **Example2**: AA 02 01 00
672
673 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
674
675 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
676
677 MOD6 Payload : total 11 bytes payload
678
679 [[image:image-20220524085923-1.png]]
680
681 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
682
683 [[image:image-20220524090106-2.png]]
684
685 * Each bits shows if the corresponding trigger has been configured.
686
687 **Example:**
688
689 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
690
691
692 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
693
694 [[image:image-20220524090249-3.png]]
695
696 * Each bits shows which status has been trigger on this uplink.
697
698 **Example:**
699
700 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
701
702
703 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
704
705 [[image:image-20220524090456-4.png]]
706
707 * Each bits shows which status has been trigger on this uplink.
708
709 **Example:**
710
711 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
712
713 00000101: Means both DI1 and DI2 trigger are enabled.
714
715
716 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
717
718 Downlink command to poll MOD6 status:
719
720 **AB 06**
721
722 When device got this command, it will send the MOD6 payload.
723
724
725
726 === 3.3.7 Payload Decoder ===
727
728 (((
729 **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/]]
730
731
732 )))
733
734
735
736 == 3.4 ​Configure LT via AT or Downlink ==
737
738 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
739
740 (((
741 There are two kinds of Commands:
742 )))
743
744 * (% 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]]
745
746 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
747
748
749 === 3.4.1 Common Commands ===
750
751 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]]
752
753
754
755 === 3.4.2 Sensor related commands ===
756
757 ==== 3.4.2.1 Set Transmit Interval ====
758
759 Set device uplink interval.
760
761 * AT Command:
762
763 (% class="box infomessage" %)
764 (((
765 **AT+TDC=N **
766 )))
767
768 **Example: **AT+TDC=30000. Means set interval to 30 seconds
769
770 * Downlink Payload (prefix 0x01):
771
772 (% class="box infomessage" %)
773 (((
774 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
775 )))
776
777
778
779 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
780
781 Set work mode.
782
783 * AT Command:
784
785 (% class="box infomessage" %)
786 (((
787 **AT+MOD=N  **
788 )))
789
790 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
791
792 * Downlink Payload (prefix 0x0A):
793
794 (% class="box infomessage" %)
795 (((
796 **0x0A aa     ~/~/ Same as AT+MOD=aa**
797 )))
798
799
800
801 ==== 3.4.2.3 Poll an uplink ====
802
803 * AT Command:
804
805 There is no AT Command to poll uplink
806
807 * Downlink Payload (prefix 0x08):
808
809 (% class="box infomessage" %)
810 (((
811 **0x08 FF     ~/~/ Poll an uplink,**
812 )))
813
814 **Example**: 0x08FF, ask device to send an Uplink
815
816
817
818 ==== 3.4.2.4 Enable Trigger Mode ====
819
820 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
821
822 * AT Command:
823
824 (% class="box infomessage" %)
825 (((
826 **AT+ADDMOD6=1 or 0**
827 )))
828
829 1: Enable Trigger Mode
830
831 0: Disable Trigger Mode
832
833 * Downlink Payload (prefix 0x0A 06):
834
835 (% class="box infomessage" %)
836 (((
837 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
838 )))
839
840
841
842 ==== 3.4.2.5 Poll trigger settings ====
843
844 Poll trigger settings,
845
846 * AT Command:
847
848 There is no AT Command for this feature.
849
850 * Downlink Payload (prefix 0x AB 06):
851
852 (% class="box infomessage" %)
853 (((
854 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
855 )))
856
857
858
859 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
860
861 Enable Disable DI1/DI2/DI2 as trigger,
862
863 * AT Command:
864
865 (% class="box infomessage" %)
866 (((
867 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
868 )))
869
870 **Example:**
871
872 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
873
874 * Downlink Payload (prefix 0xAA 02):
875
876 (% class="box infomessage" %)
877 (((
878 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
879 )))
880
881
882
883 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
884
885 Set DI1 or DI3(for LT-33222-L) trigger.
886
887 * AT Command:
888
889 (% class="box infomessage" %)
890 (((
891 **AT+TRIG1=a,b**
892 )))
893
894 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
895
896 b : delay timing.
897
898 **Example:**
899
900 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
901
902 * Downlink Payload (prefix 0x09 01 ):
903
904 (% class="box infomessage" %)
905 (((
906 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
907 )))
908
909
910
911 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
912
913 Set DI2 trigger.
914
915 * AT Command:
916
917 (% class="box infomessage" %)
918 (((
919 **AT+TRIG2=a,b**
920 )))
921
922 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
923
924 b : delay timing.
925
926 **Example:**
927
928 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
929
930 * Downlink Payload (prefix 0x09 02 ):
931
932 (% class="box infomessage" %)
933 (((
934 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
935 )))
936
937
938
939 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
940
941 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
942
943 * AT Command:
944
945 (% class="box infomessage" %)
946 (((
947 **AT+ACLIM. **
948 )))
949
950 * Downlink Payload (prefix 0xAA 01 ):
951
952 (% class="box infomessage" %)
953 (((
954 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
955 )))
956
957
958
959 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
960
961 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
962
963 * AT Command:
964
965 (% class="box infomessage" %)
966 (((
967 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
968 )))
969
970 * Downlink Payload (prefix 0xAA 00 ):
971
972 (% class="box infomessage" %)
973 (((
974 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
975 )))
976
977
978
979 ==== 3.4.2.11 Trigger – Set minimum interval ====
980
981 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
982
983 * AT Command:
984
985 (% class="box infomessage" %)
986 (((
987 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
988 )))
989
990 * Downlink Payload (prefix 0xAC ):
991
992 (% class="box infomessage" %)
993 (((
994 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
995 )))
996
997
998
999 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1000
1001 * AT Command:
1002
1003 There is no AT Command to control Digital Output
1004
1005 * Downlink Payload (prefix 0x02):
1006
1007 (% class="box infomessage" %)
1008 (((
1009 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1010 )))
1011
1012 (((
1013 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1014 )))
1015
1016 (((
1017 01: Low,  00: High ,  11: No action
1018 )))
1019
1020 [[image:image-20220524092754-5.png]]
1021
1022 (((
1023 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1024 )))
1025
1026 (((
1027 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1028 )))
1029
1030
1031
1032 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1033
1034 * AT Command:
1035
1036 There is no AT Command to control Digital Output
1037
1038 * Downlink Payload (prefix 0xA9):
1039
1040 (% class="box infomessage" %)
1041 (((
1042 (((
1043 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1044 )))
1045 )))
1046
1047 This is to control the digital output time of DO pin. Include four bytes:
1048
1049 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1050
1051 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1052
1053 01: DO pins will change back to original state after timeout.
1054
1055 00: DO pins will change to an inverter state after timeout 
1056
1057 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1058
1059 [[image:image-20220524093238-6.png]]
1060
1061 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1062
1063 [[image:image-20220524093328-7.png]]
1064
1065 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1066
1067 [[image:image-20220524093351-8.png]]
1068
1069 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1070
1071 Latching time. Unit: ms
1072
1073 Device will upload a packet if downlink code executes successfully.
1074
1075 **Example payload:**
1076
1077 **~1. A9 01 01 01 01 07 D0**
1078
1079 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1080
1081 **2. A9 01 00 01 11 07 D0**
1082
1083 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1084
1085 **3. A9 00 00 00 00 07 D0**
1086
1087 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1088
1089 **4. A9 00 11 01 00 07 D0**
1090
1091 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
1092
1093
1094
1095 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1096
1097 * AT Command:
1098
1099 There is no AT Command to control Relay Output
1100
1101 * Downlink Payload (prefix 0x03):
1102
1103 (% class="box infomessage" %)
1104 (((
1105 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1106 )))
1107
1108 (((
1109 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1110 )))
1111
1112 (((
1113 01: Close ,  00: Open , 11: No action
1114 )))
1115
1116 (((
1117 [[image:image-20220524093724-9.png]]
1118 )))
1119
1120 Device will upload a packet if downlink code executes successfully.
1121
1122
1123
1124 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1125
1126 * AT Command:
1127
1128 There is no AT Command to control Relay Output
1129
1130 * Downlink Payload (prefix 0x05):
1131
1132 (% class="box infomessage" %)
1133 (((
1134 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1135 )))
1136
1137 This is to control the relay output time of relay. Include four bytes:
1138
1139 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1140
1141 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1142
1143 01: Relays will change back to original state after timeout.
1144
1145 00: Relays will change to an inverter state after timeout
1146
1147 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1148
1149 [[image:image-20220524093831-10.png]]
1150
1151 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1152
1153 Device will upload a packet if downlink code executes successfully.
1154
1155 **Example payload:**
1156
1157 **~1. 05 01 11 07 D0**
1158
1159 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1160
1161 **2. 05 01 10 07 D0**
1162
1163 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1164
1165 **3. 05 00 01 07 D0**
1166
1167 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1168
1169 **4. 05 00 00 07 D0**
1170
1171 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1172
1173
1174
1175 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1176
1177 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1178
1179 * AT Command:
1180
1181 (% class="box infomessage" %)
1182 (((
1183 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1184 )))
1185
1186 * Downlink Payload (prefix 0xA5):
1187
1188 (% class="box infomessage" %)
1189 (((
1190 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1191 )))
1192
1193
1194
1195 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1196
1197 * AT Command:
1198
1199 (% class="box infomessage" %)
1200 (((
1201 **AT+SETCNT=aa,(bb cc dd ee) **
1202 )))
1203
1204 aa: 1: Set count1,
1205
1206 2: Set count2,
1207
1208 3: Set AV1 count
1209
1210 Bb cc dd ee: number to be set
1211
1212 * Downlink Payload (prefix 0xA8):
1213
1214 (% class="box infomessage" %)
1215 (((
1216 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1217 )))
1218
1219
1220
1221 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1222
1223 Clear counting for counting mode
1224
1225 * AT Command:
1226
1227 (% class="box infomessage" %)
1228 (((
1229 **AT+CLRCOUNT ~/~/ clear all counting**
1230 )))
1231
1232 * Downlink Payload (prefix 0xA6):
1233
1234 (% class="box infomessage" %)
1235 (((
1236 **0x A6 01     ~/~/ clear all counting,**
1237 )))
1238
1239
1240
1241 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1242
1243 * AT Command:
1244
1245 (% class="box infomessage" %)
1246 (((
1247 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1248 )))
1249
1250 * Downlink Payload (prefix 0xA7):
1251
1252 (% class="box infomessage" %)
1253 (((
1254 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1255 )))
1256
1257 (((
1258 range: aa bb cc:0 to 16777215,  (unit:second)
1259
1260
1261 )))
1262
1263
1264
1265 == 3.5 Integrate with Mydevice ==
1266
1267 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:
1268
1269 (((
1270 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1271 )))
1272
1273 (((
1274 **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:
1275 )))
1276
1277 [[image:1653356737703-362.png||height="232" width="732"]]
1278
1279 [[image:image-20220524094641-11.png||height="390" width="723"]]
1280
1281 [[image:image-20220524094641-12.png||height="402" width="718"]]
1282
1283
1284 **Step 3**: Create an account or log in Mydevices.
1285
1286 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1287
1288 Search under The things network
1289
1290 [[image:1653356838789-523.png||height="337" width="740"]]
1291
1292
1293 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1294
1295 [[image:image-20220524094909-1.png||height="335" width="729"]]
1296
1297 [[image:image-20220524094909-2.png||height="337" width="729"]]
1298
1299 [[image:image-20220524094909-3.png||height="338" width="727"]]
1300
1301 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1302
1303 [[image:image-20220524094909-5.png||height="341" width="734"]]
1304
1305
1306
1307 == 3.6 Interface Detail ==
1308
1309 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1310
1311 Support NPN Type sensor
1312
1313 [[image:1653356991268-289.png]]
1314
1315
1316
1317 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1318
1319 (((
1320 The DI port of LT-22222-L can support NPN or PNP output sensor.
1321 )))
1322
1323 (((
1324 (((
1325 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
1326 )))
1327 )))
1328
1329 [[image:1653357170703-587.png]]
1330
1331 (((
1332 (((
1333 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1334 )))
1335 )))
1336
1337 (((
1338
1339 )))
1340
1341 (((
1342 **Example1**: Connect to a Low active sensor.
1343 )))
1344
1345 (((
1346 This type of sensor will output a low signal GND when active.
1347 )))
1348
1349 * (((
1350 Connect sensor’s output to DI1-
1351 )))
1352 * (((
1353 Connect sensor’s VCC to DI1+.
1354 )))
1355
1356 (((
1357 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1358 )))
1359
1360 (((
1361 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1362 )))
1363
1364 (((
1365 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.
1366 )))
1367
1368 (((
1369
1370 )))
1371
1372 (((
1373 **Example2**: Connect to a High active sensor.
1374 )))
1375
1376 (((
1377 This type of sensor will output a high signal (example 24v) when active.
1378 )))
1379
1380 * (((
1381 Connect sensor’s output to DI1+
1382 )))
1383 * (((
1384 Connect sensor’s GND DI1-.
1385 )))
1386
1387 (((
1388 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1389 )))
1390
1391 (((
1392 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1393 )))
1394
1395 (((
1396 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.
1397 )))
1398
1399 (((
1400
1401 )))
1402
1403 (((
1404 **Example3**: Connect to a 220v high active sensor.
1405 )))
1406
1407 (((
1408 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1409 )))
1410
1411 * (((
1412 Connect sensor’s output to DI1+ with a serial 50K resistor
1413 )))
1414 * (((
1415 Connect sensor’s GND DI1-.
1416 )))
1417
1418 (((
1419 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1420 )))
1421
1422 (((
1423 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1424 )))
1425
1426 (((
1427 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.
1428 )))
1429
1430
1431
1432 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1433
1434 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1435
1436 [[image:1653357531600-905.png]]
1437
1438
1439
1440 === 3.6.4 Analog Input Interface ===
1441
1442 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:
1443
1444 **AC2 = (IN2 voltage )/12**
1445
1446 [[image:1653357592296-182.png]]
1447
1448 Example to connect a 4~~20mA sensor
1449
1450 We take the wind speed sensor as an example for reference only.
1451
1452 Specifications of the wind speed sensor:
1453
1454 Red:12~~24v
1455
1456 Yellow:4~~20mA
1457
1458 Black:GND
1459
1460
1461 Connection diagram:
1462
1463 [[image:1653357640609-758.png]]
1464
1465 [[image:1653357648330-671.png||height="155" width="733"]]
1466
1467
1468
1469 === 3.6.5 Relay Output ===
1470
1471 (((
1472 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:
1473 )))
1474
1475 [[image:image-20220524100215-9.png]]
1476
1477 [[image:image-20220524100215-10.png||height="382" width="723"]]
1478
1479
1480
1481 == 3.7 LEDs Indicators ==
1482
1483 [[image:image-20220524100748-11.png]]
1484
1485
1486 = 4. Use AT Command =
1487
1488 == 4.1 Access AT Command ==
1489
1490 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.
1491
1492 [[image:1653358238933-385.png]]
1493
1494 (((
1495 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:
1496 )))
1497
1498 [[image:1653358355238-883.png]]
1499
1500 (((
1501 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/]]
1502 )))
1503
1504 (((
1505 AT+<CMD>?        : Help on <CMD>
1506 )))
1507
1508 (((
1509 AT+<CMD>         : Run <CMD>
1510 )))
1511
1512 (((
1513 AT+<CMD>=<value> : Set the value
1514 )))
1515
1516 (((
1517 AT+<CMD>=?       : Get the value
1518 )))
1519
1520 (((
1521 ATZ: Trig a reset of the MCU
1522 )))
1523
1524 (((
1525 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1526 )))
1527
1528 (((
1529 AT+DEUI: Get or Set the Device EUI
1530 )))
1531
1532 (((
1533 AT+DADDR: Get or Set the Device Address
1534 )))
1535
1536 (((
1537 AT+APPKEY: Get or Set the Application Key
1538 )))
1539
1540 (((
1541 AT+NWKSKEY: Get or Set the Network Session Key
1542 )))
1543
1544 (((
1545 AT+APPSKEY: Get or Set the Application Session Key
1546 )))
1547
1548 (((
1549 AT+APPEUI: Get or Set the Application EUI
1550 )))
1551
1552 (((
1553 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1554 )))
1555
1556 (((
1557 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1558 )))
1559
1560 (((
1561 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1562 )))
1563
1564 (((
1565 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1566 )))
1567
1568 (((
1569 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1570 )))
1571
1572 (((
1573 AT+RX2FQ: Get or Set the Rx2 window frequency
1574 )))
1575
1576 (((
1577 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1578 )))
1579
1580 (((
1581 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1582 )))
1583
1584 (((
1585 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1586 )))
1587
1588 (((
1589 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1590 )))
1591
1592 (((
1593 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1594 )))
1595
1596 (((
1597 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1598 )))
1599
1600 (((
1601 AT+NWKID: Get or Set the Network ID
1602 )))
1603
1604 (((
1605 AT+FCU: Get or Set the Frame Counter Uplink
1606 )))
1607
1608 (((
1609 AT+FCD: Get or Set the Frame Counter Downlink
1610 )))
1611
1612 (((
1613 AT+CLASS: Get or Set the Device Class
1614 )))
1615
1616 (((
1617 AT+JOIN: Join network
1618 )))
1619
1620 (((
1621 AT+NJS: Get OTAA Join Status
1622 )))
1623
1624 (((
1625 AT+SENDB: Send hexadecimal data along with the application port
1626 )))
1627
1628 (((
1629 AT+SEND: Send text data along with the application port
1630 )))
1631
1632 (((
1633 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1634 )))
1635
1636 (((
1637 AT+RECV: Print last received data in raw format
1638 )))
1639
1640 (((
1641 AT+VER: Get current image version and Frequency Band
1642 )))
1643
1644 (((
1645 AT+CFM: Get or Set the confirmation mode (0-1)
1646 )))
1647
1648 (((
1649 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1650 )))
1651
1652 (((
1653 AT+SNR: Get the SNR of the last received packet
1654 )))
1655
1656 (((
1657 AT+RSSI: Get the RSSI of the last received packet
1658 )))
1659
1660 (((
1661 AT+TDC: Get or set the application data transmission interval in ms
1662 )))
1663
1664 (((
1665 AT+PORT: Get or set the application port
1666 )))
1667
1668 (((
1669 AT+DISAT: Disable AT commands
1670 )))
1671
1672 (((
1673 AT+PWORD: Set password, max 9 digits
1674 )))
1675
1676 (((
1677 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1678 )))
1679
1680 (((
1681 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1682 )))
1683
1684 (((
1685 AT+CFG: Print all settings
1686
1687
1688 )))
1689
1690
1691
1692 == 4.2 Common AT Command Sequence ==
1693
1694 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1695
1696 (((
1697 If device has not joined network yet:
1698 )))
1699
1700 (((
1701 (% style="background-color:#dcdcdc" %)123456
1702 )))
1703
1704 (((
1705 (% style="background-color:#dcdcdc" %)AT+FDR
1706 )))
1707
1708 (((
1709 (% style="background-color:#dcdcdc" %)123456
1710 )))
1711
1712 (((
1713 (% style="background-color:#dcdcdc" %)AT+NJM=0
1714 )))
1715
1716 (((
1717 (% style="background-color:#dcdcdc" %)ATZ
1718 )))
1719
1720
1721 (((
1722 If device already joined network:
1723 )))
1724
1725 (((
1726 (% style="background-color:#dcdcdc" %)AT+NJM=0
1727 )))
1728
1729 (((
1730 (% style="background-color:#dcdcdc" %)ATZ
1731
1732
1733 )))
1734
1735
1736
1737 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1738
1739 (((
1740 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1741 )))
1742
1743 (((
1744 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1745 )))
1746
1747 (((
1748 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1749 )))
1750
1751 (((
1752 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1753 )))
1754
1755 (((
1756 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1757 )))
1758
1759 (((
1760 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1761 )))
1762
1763 (((
1764 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1765 )))
1766
1767 (((
1768 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1769 )))
1770
1771 (((
1772 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1773 )))
1774
1775 (((
1776 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1777 )))
1778
1779 (((
1780 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1781 )))
1782
1783 (((
1784 (% 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.
1785 )))
1786
1787 (((
1788 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1789 )))
1790
1791 (((
1792 (% style="color:red" %)**Note:**
1793 )))
1794
1795 (((
1796 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1797 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1798 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.
1799 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
1800 )))
1801
1802 (((
1803 [[image:1653359097980-169.png||height="188" width="729"]]
1804 )))
1805
1806 (((
1807
1808 )))
1809
1810
1811
1812 === 4.2.3 Change to Class A ===
1813
1814 If sensor JOINED
1815 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1816 ATZ
1817
1818
1819 = 5. FAQ =
1820
1821 == 5.1 How to upgrade the image? ==
1822
1823 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1824
1825 * Support new features
1826 * For bug fix
1827 * Change LoRaWAN bands.
1828 Below shows the hardware connection for how to upload an image to the LT:
1829 * [[image:1653359603330-121.png]]
1830
1831 (((
1832 **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]].
1833 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1834 **Step3: **Open flashloader; choose the correct COM port to update.
1835 **For LT-22222-L**:
1836 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.
1837 )))
1838
1839 [[image:image-20220524103407-12.png]]
1840
1841 [[image:image-20220524103429-13.png]]
1842
1843 [[image:image-20220524104033-15.png]]
1844
1845 (% 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:
1846
1847 [[image:1653360054704-518.png||height="186" width="745"]]
1848
1849
1850 (((
1851 (((
1852
1853
1854 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1855 )))
1856 )))
1857
1858 (((
1859 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1860
1861
1862 )))
1863
1864 (((
1865
1866
1867
1868 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1869 )))
1870
1871 (((
1872 (((
1873 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1874 )))
1875 )))
1876
1877 (((
1878 (((
1879 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1880
1881
1882 )))
1883 )))
1884
1885 (((
1886 (% 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.
1887 )))
1888
1889 (((
1890 [[image:1653360231087-571.png||height="401" width="727"]]
1891 )))
1892
1893 (((
1894 (% 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.
1895 )))
1896
1897
1898 (((
1899 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1900 )))
1901
1902 (((
1903 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1904 (% style="background-color:#dcdcdc" %)AT+FDR(%%)  Reset Parameters to Factory Default, Keys Reserve
1905 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1906 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%) Set to ABP mode
1907 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%) Set the Adaptive Data Rate Off
1908 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1909 (% style="background-color:#dcdcdc" %)AT+TDC=60000 (%%) Set transmit interval to 60 seconds
1910 (% style="background-color:#dcdcdc" %)AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1911 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%)  Set Device Address to 26 01 1A F1
1912 (% style="background-color:#dcdcdc" %)ATZ  (%%) Reset MCU
1913 )))
1914
1915
1916 (((
1917 As shown in below:
1918 )))
1919
1920 [[image:1653360498588-932.png||height="485" width="726"]]
1921
1922
1923 == 5.4 Can I see counting event in Serial? ==
1924
1925 (((
1926 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.
1927
1928
1929 == 5.5 Can i use point to point communication for LT-22222-L? ==
1930
1931 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1932 )))
1933
1934 (((
1935
1936
1937 = 6. Trouble Shooting =
1938 )))
1939
1940 (((
1941 (((
1942 == 6.1 Downlink doesn’t work, how to solve it? ==
1943 )))
1944 )))
1945
1946 (((
1947 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1948 )))
1949
1950 (((
1951
1952
1953 == 6.2 Have trouble to upload image. ==
1954 )))
1955
1956 (((
1957 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1958 )))
1959
1960 (((
1961
1962
1963 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1964 )))
1965
1966 (((
1967 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1968 )))
1969
1970
1971
1972 = 7. Order Info =
1973
1974
1975 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1976
1977
1978 (% style="color:#4f81bd" %)**XXX:**
1979
1980 * (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1981 * (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1982 * (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1983 * (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1984 * (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1985 * (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1986 * (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1987 * (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1988 * (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1989
1990
1991
1992 = 8. Packing Info =
1993
1994
1995 **Package Includes**:
1996
1997 * LT-22222-L I/O Controller x 1
1998 * Stick Antenna for LoRa RF part x 1
1999 * Bracket for controller x1
2000 * Program cable x 1
2001
2002
2003 **Dimension and weight**:
2004
2005 * Device Size: 13.5 x 7 x 3 cm
2006 * Device Weight: 105g
2007 * Package Size / pcs : 14.5 x 8 x 5 cm
2008 * Weight / pcs : 170g
2009
2010
2011
2012 = 9. Support =
2013
2014 * (((
2015 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.
2016 )))
2017 * (((
2018 Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2019 )))
2020
2021
2022
2023 = 10. Reference​​​​​ =
2024
2025 * 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]]
2026 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2027 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2028 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
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