Version 77.11 by Xiaoling on 2022/06/10 08:39
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1 (% style="text-align:center" %)
2 [[image:image-20220523163353-1.jpeg||height="604" width="500"]]
3
4 **LT-22222-L LoRa IO Controller User Manual **
5
6
7 **Table of Contents:**
8
9 {{toc/}}
10
11
12
13
14
15
16
17 = 1.Introduction =
18
19 == 1.1 What is LT Series I/O Controller ==
20
21 (((
22 The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
23 )))
24
25 (((
26 The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
27 )))
28
29 (((
30 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
31 )))
32
33 (((
34 The use environment includes:
35 )))
36
37 (((
38 1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.
39 )))
40
41 (((
42 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
43 )))
44
45 (((
46 [[image:1653295757274-912.png]]
47
48
49 )))
50
51 == 1.2  Specifications ==
52
53 (((
54
55
56 **Hardware System:**
57 )))
58
59 * (((
60 STM32L072CZT6 MCU
61 )))
62 * (((
63 SX1276/78 Wireless Chip 
64 )))
65 * (((
66 (((
67 Power Consumption:
68 )))
69
70 * (((
71 Idle: 4mA@12v
72 )))
73 * (((
74 20dB Transmit: 34mA@12v
75 )))
76 )))
77
78
79 (((
80 **Interface for Model: LT22222-L:**
81 )))
82
83 * (((
84 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
85 )))
86 * (((
87 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
88 )))
89 * (((
90 2 x Relay Output (5A@250VAC / 30VDC)
91 )))
92 * (((
93 2 x 0~~20mA Analog Input (res:0.01mA)
94 )))
95 * (((
96 2 x 0~~30V Analog Input (res:0.01v)
97 )))
98 * (((
99 Power Input 7~~ 24V DC. 
100 )))
101
102
103 (((
104 **LoRa Spec:**
105 )))
106
107 * (((
108 (((
109 Frequency Range:
110 )))
111
112 * (((
113 Band 1 (HF): 862 ~~ 1020 Mhz
114 )))
115 * (((
116 Band 2 (LF): 410 ~~ 528 Mhz
117 )))
118 )))
119 * (((
120 168 dB maximum link budget.
121 )))
122 * (((
123 +20 dBm - 100 mW constant RF output vs.
124 )))
125 * (((
126 +14 dBm high efficiency PA.
127 )))
128 * (((
129 Programmable bit rate up to 300 kbps.
130 )))
131 * (((
132 High sensitivity: down to -148 dBm.
133 )))
134 * (((
135 Bullet-proof front end: IIP3 = -12.5 dBm.
136 )))
137 * (((
138 Excellent blocking immunity.
139 )))
140 * (((
141 Low RX current of 10.3 mA, 200 nA register retention.
142 )))
143 * (((
144 Fully integrated synthesizer with a resolution of 61 Hz.
145 )))
146 * (((
147 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
148 )))
149 * (((
150 Built-in bit synchronizer for clock recovery.
151 )))
152 * (((
153 Preamble detection.
154 )))
155 * (((
156 127 dB Dynamic Range RSSI.
157 )))
158 * (((
159 Automatic RF Sense and CAD with ultra-fast AFC.
160 )))
161 * (((
162 Packet engine up to 256 bytes with CRC.
163
164
165 )))
166
167
168
169 == 1.3 Features ==
170
171 * LoRaWAN Class A & Class C protocol
172 * Optional Customized LoRa Protocol
173 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
174 * AT Commands to change parameters
175 * Remote configure parameters via LoRa Downlink
176 * Firmware upgradable via program port
177 * Counting
178
179
180
181 == 1.4  Applications ==
182
183 * Smart Buildings & Home Automation
184 * Logistics and Supply Chain Management
185 * Smart Metering
186 * Smart Agriculture
187 * Smart Cities
188 * Smart Factory
189
190
191
192 == 1.5 Hardware Variants ==
193
194 (% border="1" style="background-color:#f7faff; width:500px" %)
195 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
196 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
197 * 2 x Digital Input (Bi-direction)
198 * 2 x Digital Output
199 * 2 x Relay Output (5A@250VAC / 30VDC)
200 * 2 x 0~~20mA Analog Input (res:0.01mA)
201 * 2 x 0~~30V Analog Input (res:0.01v)
202 * 1 x Counting Port
203 )))
204
205
206
207 = 2. Power ON Device =
208
209 The LT controller can be powered by 7 ~~ 24V DC power source. Connect VIN to Power Input V+ and GND to power input V- to power the LT controller.
210
211 (((
212 PWR will on when device is properly powered.
213 )))
214
215 [[image:1653297104069-180.png]]
216
217
218
219 = 3. Operation Mode =
220
221 == 3.1 How it works? ==
222
223 (((
224 The LT is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the LT. It will auto join the network via OTAA. For LT-22222-L, the LED will show the Join status: After power on **TX LED** will fast blink 5 times, LT-22222-L will enter working mode and start to JOIN LoRaWAN network. **TX LED** will be on for 5 seconds after joined in network. When there is message from server, the **RX LED** will be on for 1 second. 
225 )))
226
227 (((
228 In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>||anchor="H4.UseATCommand"]] to set the keys in the devices.
229
230
231 )))
232
233
234
235 == 3.2 Example to join LoRaWAN network ==
236
237 (((
238 This chapter shows an example for how to join the TTN LoRaWAN Network. Below is the network structure, we use our LG308 as LoRaWAN gateway here. 
239 )))
240
241 [[image:image-20220523172350-1.png||height="266" width="864"]]
242
243 (((
244 The LG308 is already set to connect to [[TTN network >>url:https://www.thethingsnetwork.org/]]. So what we need to do now is only configure register this device to TTN:
245 )))
246
247 (((
248 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
249 )))
250
251 (((
252 Each LT is shipped with a sticker with the default device EUI as below:
253 )))
254
255 [[image:1653297924498-393.png]]
256
257 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
258
259 Add APP EUI in the application.
260
261 [[image:1653297955910-247.png||height="321" width="716"]]
262
263
264 Add APP KEY and DEV EUI
265
266 [[image:1653298023685-319.png]]
267
268
269 (((
270 **Step 2**: Power on LT and it will auto join to the TTN network. After join success, it will start to upload message to TTN and user can see in the panel.
271 )))
272
273 [[image:1653298044601-602.png||height="405" width="709"]]
274
275
276
277 == 3.3 Uplink Payload ==
278
279 There are five working modes + one interrupt mode on LT for different type application:
280
281 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
282 * **MOD2**: Double DI Counting + DO + RO
283 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
284 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
285 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
286 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
287
288
289
290 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
291
292 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
293
294 [[image:image-20220523174024-3.png]]
295
296 (((
297 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
298 )))
299
300 [[image:image-20220523174254-4.png]]
301
302 * RO is for relay. ROx=1 : close，ROx=0 always open.
303 * DI is for digital input. DIx=1: high or float, DIx=0: low.
304 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
305
306 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
307
308 For example if payload is: [[image:image-20220523175847-2.png]]
309
310 **The value for the interface is:  **
311
312 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
313
314 AVI2 channel voltage is 0x04AC/1000=1.196V
315
316 ACI1 channel current is 0x1310/1000=4.880mA
317
318 ACI2 channel current is 0x1300/1000=4.864mA
319
320 The last byte 0xAA= 10101010(B) means
321
322 * [1] RO1 relay channel is close and the RO1 LED is ON.
323 * [0] RO2 relay channel is open and RO2 LED is OFF;
324
325
326 **LT22222-L:**
327
328 * [1] DI2 channel is high input and DI2 LED is ON;
329 * [0] DI1 channel is low input;
330
331 * [0] DO3 channel output state
332 ** DO3 is float in case no load between DO3 and V+.;
333 ** DO3 is high in case there is load between DO3 and V+.
334 ** DO3 LED is off in both case
335 * [1] DO2 channel output is low and DO2 LED is ON.
336 * [0] DO1 channel output state
337 ** DO1 is float in case no load between DO1 and V+.;
338 ** DO1 is high in case there is load between DO1 and V+.
339 ** DO1 LED is off in both case
340
341 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
342
343 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
344
345 (((
346 Total : 11 bytes payload
347 )))
348
349 [[image:image-20220523180452-3.png]]
350
351 (((
352 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
353 )))
354
355 [[image:image-20220523180506-4.png]]
356
357 * RO is for relay. ROx=1 : close，ROx=0 always open.
358 * FIRST: Indicate this is the first packet after join network.
359 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
360
361 (((
362 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
363 )))
364
365 (((
366 **To use counting mode, please run:**
367 )))
368
369 (% class="box infomessage" %)
370 (((
371 (((
372 **AT+MOD=2**
373 )))
374 )))
375
376 (% class="box infomessage" %)
377 (((
378 (((
379 **ATZ**
380 )))
381 )))
382
383 (((
384 (% style="color:#4f81bd" %)**AT Commands for counting:**
385 )))
386
387 (((
388 **For LT22222-L:**
389 )))
390
391 (% class="box infomessage" %)
392 (((
393 (((
394 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
395 )))
396 )))
397
398 (% class="box infomessage" %)
399 (((
400 (((
401 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
402 )))
403 )))
404
405 (% class="box infomessage" %)
406 (((
407 (((
408 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
409 )))
410 )))
411
412 (% class="box infomessage" %)
413 (((
414 (((
415 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
416 )))
417 )))
418
419 (% class="box infomessage" %)
420 (((
421 (((
422 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
423 )))
424 )))
425
426 (% class="box infomessage" %)
427 (((
428 (((
429 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
430 )))
431 )))
432
433
434 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
435
436 **LT22222-L**: This mode the DI1 is used as a counting pin.
437
438 [[image:image-20220523181246-5.png]]
439
440 (((
441 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
442 )))
443
444 [[image:image-20220523181301-6.png]]
445
446 * RO is for relay. ROx=1 : close，ROx=0 always open.
447 * FIRST: Indicate this is the first packet after join network.
448 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
449
450 (((
451 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
452 )))
453
454 (((
455 **To use counting mode, please run:**
456 )))
457
458 (% class="box infomessage" %)
459 (((
460 (((
461 **AT+MOD=3**
462 )))
463 )))
464
465 (% class="box infomessage" %)
466 (((
467 (((
468 **ATZ**
469 )))
470 )))
471
472 (((
473 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
474
475
476 )))
477
478 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
479
480 **LT22222-L**: This mode the DI1 is used as a counting pin.
481
482 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.
483
484 [[image:image-20220523181903-8.png]]
485
486 (((
487 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
488 )))
489
490 [[image:image-20220523181727-7.png]]
491
492 * RO is for relay. ROx=1 : close，ROx=0 always open.
493 * FIRST: Indicate this is the first packet after join network.
494 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
495
496 (((
497 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
498 )))
499
500 (((
501 **To use this mode, please run:**
502 )))
503
504 (% class="box infomessage" %)
505 (((
506 (((
507 **AT+MOD=4**
508 )))
509 )))
510
511 (% class="box infomessage" %)
512 (((
513 (((
514 **ATZ**
515 )))
516 )))
517
518 (((
519
520 )))
521
522 (((
523 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
524 )))
525
526 (((
527 **Plus below command for AVI1 Counting:**
528 )))
529
530 (% class="box infomessage" %)
531 (((
532 (((
533 **AT+SETCNT=3,60   (set AVI Count to 60)**
534 )))
535 )))
536
537 (% class="box infomessage" %)
538 (((
539 (((
540 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
541 )))
542 )))
543
544 (% class="box infomessage" %)
545 (((
546 (((
547 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
548 )))
549 )))
550
551 (% class="box infomessage" %)
552 (((
553 (((
554 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
555 )))
556 )))
557
558
559 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
560
561 **LT22222-L**: This mode the DI1 is used as a counting pin.
562
563 [[image:image-20220523182334-9.png]]
564
565 (((
566 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
567 )))
568
569 * RO is for relay. ROx=1 : close，ROx=0 always open.
570 * FIRST: Indicate this is the first packet after join network.
571 * (((
572 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
573 )))
574
575 (((
576 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
577 )))
578
579 (((
580 **To use this mode, please run:**
581 )))
582
583 (% class="box infomessage" %)
584 (((
585 (((
586 **AT+MOD=5**
587 )))
588 )))
589
590 (% class="box infomessage" %)
591 (((
592 (((
593 **ATZ**
594 )))
595 )))
596
597 (((
598 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
599
600
601 )))
602
603 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
604
605 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
606
607 For example, if user has configured below commands:
608
609 * **AT+MOD=1 ** **~-~->** The normal working mode
610 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
611
612 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
613
614 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
615 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.**
616
617 **AT Command to set Trigger Condition**:
618
619 (% style="color:#4f81bd" %)**Trigger base on voltage**:
620
621 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
622
623 **Example:**
624
625 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)
626
627 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
628
629
630 (% style="color:#4f81bd" %)**Trigger base on current**:
631
632 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
633
634 **Example:**
635
636 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
637
638
639 (% style="color:#4f81bd" %)**Trigger base on DI status**:
640
641 DI status trigger Flag.
642
643 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
644
645 **Example:**
646
647 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
648
649
650 **Downlink Command to set Trigger Condition**
651
652 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
653
654 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
655
656 AA: Code for this downlink Command:
657
658 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
659
660 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
661
662 yy2 yy2: AC1 or AV1 high limit.
663
664 yy3 yy3: AC2 or AV2 low limit.
665
666 Yy4 yy4: AC2 or AV2 high limit.
667
668 **Example1**: AA 00 13 88 00 00 00 00 00 00
669
670 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
671
672 **Example2**: AA 02 01 00
673
674 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
675
676 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
677
678 MOD6 Payload : total 11 bytes payload
679
680 [[image:image-20220524085923-1.png]]
681
682 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
683
684 [[image:image-20220524090106-2.png]]
685
686 * Each bits shows if the corresponding trigger has been configured.
687
688 **Example:**
689
690 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
691
692
693 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
694
695 [[image:image-20220524090249-3.png]]
696
697 * Each bits shows which status has been trigger on this uplink.
698
699 **Example:**
700
701 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
702
703
704 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
705
706 [[image:image-20220524090456-4.png]]
707
708 * Each bits shows which status has been trigger on this uplink.
709
710 **Example:**
711
712 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
713
714 00000101: Means both DI1 and DI2 trigger are enabled.
715
716
717 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
718
719 Downlink command to poll MOD6 status:
720
721 **AB 06**
722
723 When device got this command, it will send the MOD6 payload.
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 == 3.4 ​Configure LT via AT or Downlink ==
735
736 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
737
738 (((
739 There are two kinds of Commands:
740 )))
741
742 * (% 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]]
743
744 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
745
746 === 3.4.1 Common Commands ===
747
748 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]]
749
750
751 === 3.4.2 Sensor related commands ===
752
753 ==== 3.4.2.1 Set Transmit Interval ====
754
755 Set device uplink interval.
756
757 * AT Command:
758
759 (% class="box infomessage" %)
760 (((
761 **AT+TDC=N **
762 )))
763
764 **Example: **AT+TDC=30000. Means set interval to 30 seconds
765
766 * Downlink Payload (prefix 0x01):
767
768 (% class="box infomessage" %)
769 (((
770 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
771 )))
772
773
774 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
775
776 Set work mode.
777
778 * AT Command:
779
780 (% class="box infomessage" %)
781 (((
782 **AT+MOD=N  **
783 )))
784
785 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
786
787 * Downlink Payload (prefix 0x0A):
788
789 (% class="box infomessage" %)
790 (((
791 **0x0A aa     ~/~/ Same as AT+MOD=aa**
792 )))
793
794
795 ==== 3.4.2.3 Poll an uplink ====
796
797 * AT Command:
798
799 There is no AT Command to poll uplink
800
801 * Downlink Payload (prefix 0x08):
802
803 (% class="box infomessage" %)
804 (((
805 **0x08 FF     ~/~/ Poll an uplink,**
806 )))
807
808 **Example**: 0x08FF, ask device to send an Uplink
809
810
811 ==== 3.4.2.4 Enable Trigger Mode ====
812
813 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
814
815 * AT Command:
816
817 (% class="box infomessage" %)
818 (((
819 **AT+ADDMOD6=1 or 0**
820 )))
821
822 1: Enable Trigger Mode
823
824 0: Disable Trigger Mode
825
826 * Downlink Payload (prefix 0x0A 06):
827
828 (% class="box infomessage" %)
829 (((
830 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
831 )))
832
833
834 ==== 3.4.2.5 Poll trigger settings ====
835
836 Poll trigger settings,
837
838 * AT Command:
839
840 There is no AT Command for this feature.
841
842 * Downlink Payload (prefix 0x AB 06):
843
844 (% class="box infomessage" %)
845 (((
846 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
847 )))
848
849
850 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
851
852 Enable Disable DI1/DI2/DI2 as trigger,
853
854 * AT Command:
855
856 (% class="box infomessage" %)
857 (((
858 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
859 )))
860
861 **Example:**
862
863 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
864
865 * Downlink Payload (prefix 0xAA 02):
866
867 (% class="box infomessage" %)
868 (((
869 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
870 )))
871
872
873 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
874
875 Set DI1 or DI3(for LT-33222-L) trigger.
876
877 * AT Command:
878
879 (% class="box infomessage" %)
880 (((
881 **AT+TRIG1=a,b**
882 )))
883
884 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
885
886 b : delay timing.
887
888 **Example:**
889
890 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
891
892 * Downlink Payload (prefix 0x09 01 ):
893
894 (% class="box infomessage" %)
895 (((
896 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
897 )))
898
899
900 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
901
902 Set DI2 trigger.
903
904 * AT Command:
905
906 (% class="box infomessage" %)
907 (((
908 **AT+TRIG2=a,b**
909 )))
910
911 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
912
913 b : delay timing.
914
915 **Example:**
916
917 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
918
919 * Downlink Payload (prefix 0x09 02 ):
920
921 (% class="box infomessage" %)
922 (((
923 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
924 )))
925
926
927 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
928
929 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
930
931 * AT Command:
932
933 (% class="box infomessage" %)
934 (((
935 **AT+ACLIM. **
936 )))
937
938 * Downlink Payload (prefix 0xAA 01 ):
939
940 (% class="box infomessage" %)
941 (((
942 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
943 )))
944
945
946 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
947
948 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
949
950 * AT Command:
951
952 (% class="box infomessage" %)
953 (((
954 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
955 )))
956
957 * Downlink Payload (prefix 0xAA 00 ):
958
959 (% class="box infomessage" %)
960 (((
961 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
962 )))
963
964
965 ==== 3.4.2.11 Trigger – Set minimum interval ====
966
967 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
968
969 * AT Command:
970
971 (% class="box infomessage" %)
972 (((
973 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
974 )))
975
976 * Downlink Payload (prefix 0xAC ):
977
978 (% class="box infomessage" %)
979 (((
980 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
981 )))
982
983
984 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
985
986 * AT Command:
987
988 There is no AT Command to control Digital Output
989
990 * Downlink Payload (prefix 0x02):
991
992 (% class="box infomessage" %)
993 (((
994 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
995 )))
996
997 (((
998 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
999 )))
1000
1001 (((
1002 01: Low,  00: High ,  11: No action
1003 )))
1004
1005 [[image:image-20220524092754-5.png]]
1006
1007 (((
1008 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1009 )))
1010
1011 (((
1012 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1013 )))
1014
1015
1016 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1017
1018 * AT Command:
1019
1020 There is no AT Command to control Digital Output
1021
1022 * Downlink Payload (prefix 0xA9):
1023
1024 (% class="box infomessage" %)
1025 (((
1026 (((
1027 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1028 )))
1029 )))
1030
1031 This is to control the digital output time of DO pin. Include four bytes:
1032
1033 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1034
1035 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1036
1037 01: DO pins will change back to original state after timeout.
1038
1039 00: DO pins will change to an inverter state after timeout 
1040
1041 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1042
1043 [[image:image-20220524093238-6.png]]
1044
1045 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1046
1047 [[image:image-20220524093328-7.png]]
1048
1049 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1050
1051 [[image:image-20220524093351-8.png]]
1052
1053 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1054
1055 Latching time. Unit: ms
1056
1057 Device will upload a packet if downlink code executes successfully.
1058
1059 **Example payload:**
1060
1061 **~1. A9 01 01 01 01 07 D0**
1062
1063 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1064
1065 **2. A9 01 00 01 11 07 D0**
1066
1067 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1068
1069 **3. A9 00 00 00 00 07 D0**
1070
1071 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1072
1073 **4. A9 00 11 01 00 07 D0**
1074
1075 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
1076
1077
1078 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1079
1080 * AT Command:
1081
1082 There is no AT Command to control Relay Output
1083
1084 * Downlink Payload (prefix 0x03):
1085
1086 (% class="box infomessage" %)
1087 (((
1088 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1089 )))
1090
1091 (((
1092 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1093 )))
1094
1095 (((
1096 01: Close ,  00: Open , 11: No action
1097 )))
1098
1099 (((
1100 [[image:image-20220524093724-9.png]]
1101 )))
1102
1103 Device will upload a packet if downlink code executes successfully.
1104
1105
1106 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1107
1108 * AT Command:
1109
1110 There is no AT Command to control Relay Output
1111
1112 * Downlink Payload (prefix 0x05):
1113
1114 (% class="box infomessage" %)
1115 (((
1116 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1117 )))
1118
1119 This is to control the relay output time of relay. Include four bytes:
1120
1121 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1122
1123 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1124
1125 01: Relays will change back to original state after timeout.
1126
1127 00: Relays will change to an inverter state after timeout
1128
1129 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1130
1131 [[image:image-20220524093831-10.png]]
1132
1133 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1134
1135 Device will upload a packet if downlink code executes successfully.
1136
1137 **Example payload:**
1138
1139 **~1. 05 01 11 07 D0**
1140
1141 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1142
1143 **2. 05 01 10 07 D0**
1144
1145 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1146
1147 **3. 05 00 01 07 D0**
1148
1149 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1150
1151 **4. 05 00 00 07 D0**
1152
1153 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1154
1155
1156 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1157
1158 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1159
1160 * AT Command:
1161
1162 (% class="box infomessage" %)
1163 (((
1164 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1165 )))
1166
1167 * Downlink Payload (prefix 0xA5):
1168
1169 (% class="box infomessage" %)
1170 (((
1171 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1172 )))
1173
1174
1175 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1176
1177 * AT Command:
1178
1179 (% class="box infomessage" %)
1180 (((
1181 **AT+SETCNT=aa,(bb cc dd ee) **
1182 )))
1183
1184 aa: 1: Set count1,
1185
1186 2: Set count2,
1187
1188 3: Set AV1 count
1189
1190 Bb cc dd ee: number to be set
1191
1192 * Downlink Payload (prefix 0xA8):
1193
1194 (% class="box infomessage" %)
1195 (((
1196 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1197 )))
1198
1199
1200 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1201
1202 Clear counting for counting mode
1203
1204 * AT Command:
1205
1206 (% class="box infomessage" %)
1207 (((
1208 **AT+CLRCOUNT ~/~/ clear all counting**
1209 )))
1210
1211 * Downlink Payload (prefix 0xA6):
1212
1213 (% class="box infomessage" %)
1214 (((
1215 **0x A6 01     ~/~/ clear all counting,**
1216 )))
1217
1218
1219 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1220
1221 * AT Command:
1222
1223 (% class="box infomessage" %)
1224 (((
1225 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1226 )))
1227
1228 * Downlink Payload (prefix 0xA7):
1229
1230 (% class="box infomessage" %)
1231 (((
1232 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1233 )))
1234
1235 (((
1236 range: aa bb cc:0 to 16777215,  (unit:second)
1237
1238
1239 )))
1240
1241 == 3.5 Integrate with Mydevice ==
1242
1243 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:
1244
1245 (((
1246 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1247 )))
1248
1249 (((
1250 **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:
1251 )))
1252
1253 [[image:1653356737703-362.png||height="232" width="732"]]
1254
1255 [[image:image-20220524094641-11.png||height="390" width="723"]]
1256
1257 [[image:image-20220524094641-12.png||height="402" width="718"]]
1258
1259
1260 **Step 3**: Create an account or log in Mydevices.
1261
1262 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1263
1264 Search under The things network
1265
1266 [[image:1653356838789-523.png||height="337" width="740"]]
1267
1268
1269 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1270
1271 [[image:image-20220524094909-1.png||height="335" width="729"]]
1272
1273 [[image:image-20220524094909-2.png||height="337" width="729"]]
1274
1275 [[image:image-20220524094909-3.png||height="338" width="727"]]
1276
1277 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1278
1279 [[image:image-20220524094909-5.png||height="341" width="734"]]
1280
1281
1282 == 3.6 Interface Detail ==
1283
1284 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1285
1286 Support NPN Type sensor
1287
1288 [[image:1653356991268-289.png]]
1289
1290
1291 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1292
1293 (((
1294 The DI port of LT-22222-L can support NPN or PNP output sensor.
1295 )))
1296
1297 (((
1298 (((
1299 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
1300 )))
1301 )))
1302
1303 [[image:1653357170703-587.png]]
1304
1305 (((
1306 (((
1307 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1308 )))
1309 )))
1310
1311 (((
1312
1313 )))
1314
1315 (((
1316 **Example1**: Connect to a Low active sensor.
1317 )))
1318
1319 (((
1320 This type of sensor will output a low signal GND when active.
1321 )))
1322
1323 * (((
1324 Connect sensor’s output to DI1-
1325 )))
1326 * (((
1327 Connect sensor’s VCC to DI1+.
1328 )))
1329
1330 (((
1331 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1332 )))
1333
1334 (((
1335 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1336 )))
1337
1338 (((
1339 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.
1340 )))
1341
1342 (((
1343
1344 )))
1345
1346 (((
1347 **Example2**: Connect to a High active sensor.
1348 )))
1349
1350 (((
1351 This type of sensor will output a high signal (example 24v) when active.
1352 )))
1353
1354 * (((
1355 Connect sensor’s output to DI1+
1356 )))
1357 * (((
1358 Connect sensor’s GND DI1-.
1359 )))
1360
1361 (((
1362 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1363 )))
1364
1365 (((
1366 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1367 )))
1368
1369 (((
1370 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.
1371 )))
1372
1373 (((
1374
1375 )))
1376
1377 (((
1378 **Example3**: Connect to a 220v high active sensor.
1379 )))
1380
1381 (((
1382 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1383 )))
1384
1385 * (((
1386 Connect sensor’s output to DI1+ with a serial 50K resistor
1387 )))
1388 * (((
1389 Connect sensor’s GND DI1-.
1390 )))
1391
1392 (((
1393 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1394 )))
1395
1396 (((
1397 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1398 )))
1399
1400 (((
1401 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.
1402 )))
1403
1404
1405 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1406
1407 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1408
1409 [[image:1653357531600-905.png]]
1410
1411
1412 === 3.6.4 Analog Input Interface ===
1413
1414 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:
1415
1416 **AC2 = (IN2 voltage )/12**
1417
1418 [[image:1653357592296-182.png]]
1419
1420 Example to connect a 4~~20mA sensor
1421
1422 We take the wind speed sensor as an example for reference only.
1423
1424 Specifications of the wind speed sensor:
1425
1426 Red:12~~24v
1427
1428 Yellow:4~~20mA
1429
1430 Black:GND
1431
1432
1433 Connection diagram:
1434
1435 [[image:1653357640609-758.png]]
1436
1437 [[image:1653357648330-671.png||height="155" width="733"]]
1438
1439
1440 === 3.6.5 Relay Output ===
1441
1442 (((
1443 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:
1444 )))
1445
1446 [[image:image-20220524100215-9.png]]
1447
1448 [[image:image-20220524100215-10.png||height="382" width="723"]]
1449
1450
1451 == 3.7 LEDs Indicators ==
1452
1453 [[image:image-20220524100748-11.png]]
1454
1455
1456 = 4. Use AT Command =
1457
1458 == 4.1 Access AT Command ==
1459
1460 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.
1461
1462 [[image:1653358238933-385.png]]
1463
1464 (((
1465 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:
1466 )))
1467
1468 [[image:1653358355238-883.png]]
1469
1470 (((
1471 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/]]
1472 )))
1473
1474 (((
1475 AT+<CMD>?        : Help on <CMD>
1476 )))
1477
1478 (((
1479 AT+<CMD>         : Run <CMD>
1480 )))
1481
1482 (((
1483 AT+<CMD>=<value> : Set the value
1484 )))
1485
1486 (((
1487 AT+<CMD>=?       : Get the value
1488 )))
1489
1490 (((
1491 ATZ: Trig a reset of the MCU
1492 )))
1493
1494 (((
1495 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1496 )))
1497
1498 (((
1499 AT+DEUI: Get or Set the Device EUI
1500 )))
1501
1502 (((
1503 AT+DADDR: Get or Set the Device Address
1504 )))
1505
1506 (((
1507 AT+APPKEY: Get or Set the Application Key
1508 )))
1509
1510 (((
1511 AT+NWKSKEY: Get or Set the Network Session Key
1512 )))
1513
1514 (((
1515 AT+APPSKEY: Get or Set the Application Session Key
1516 )))
1517
1518 (((
1519 AT+APPEUI: Get or Set the Application EUI
1520 )))
1521
1522 (((
1523 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1524 )))
1525
1526 (((
1527 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1528 )))
1529
1530 (((
1531 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1532 )))
1533
1534 (((
1535 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1536 )))
1537
1538 (((
1539 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1540 )))
1541
1542 (((
1543 AT+RX2FQ: Get or Set the Rx2 window frequency
1544 )))
1545
1546 (((
1547 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1548 )))
1549
1550 (((
1551 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1552 )))
1553
1554 (((
1555 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1556 )))
1557
1558 (((
1559 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1560 )))
1561
1562 (((
1563 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1564 )))
1565
1566 (((
1567 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1568 )))
1569
1570 (((
1571 AT+NWKID: Get or Set the Network ID
1572 )))
1573
1574 (((
1575 AT+FCU: Get or Set the Frame Counter Uplink
1576 )))
1577
1578 (((
1579 AT+FCD: Get or Set the Frame Counter Downlink
1580 )))
1581
1582 (((
1583 AT+CLASS: Get or Set the Device Class
1584 )))
1585
1586 (((
1587 AT+JOIN: Join network
1588 )))
1589
1590 (((
1591 AT+NJS: Get OTAA Join Status
1592 )))
1593
1594 (((
1595 AT+SENDB: Send hexadecimal data along with the application port
1596 )))
1597
1598 (((
1599 AT+SEND: Send text data along with the application port
1600 )))
1601
1602 (((
1603 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1604 )))
1605
1606 (((
1607 AT+RECV: Print last received data in raw format
1608 )))
1609
1610 (((
1611 AT+VER: Get current image version and Frequency Band
1612 )))
1613
1614 (((
1615 AT+CFM: Get or Set the confirmation mode (0-1)
1616 )))
1617
1618 (((
1619 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1620 )))
1621
1622 (((
1623 AT+SNR: Get the SNR of the last received packet
1624 )))
1625
1626 (((
1627 AT+RSSI: Get the RSSI of the last received packet
1628 )))
1629
1630 (((
1631 AT+TDC: Get or set the application data transmission interval in ms
1632 )))
1633
1634 (((
1635 AT+PORT: Get or set the application port
1636 )))
1637
1638 (((
1639 AT+DISAT: Disable AT commands
1640 )))
1641
1642 (((
1643 AT+PWORD: Set password, max 9 digits
1644 )))
1645
1646 (((
1647 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1648 )))
1649
1650 (((
1651 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1652 )))
1653
1654 (((
1655 AT+CFG: Print all settings
1656
1657
1658 )))
1659
1660 == 4.2 Common AT Command Sequence ==
1661
1662 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1663
1664 (((
1665 If device has not joined network yet:
1666 )))
1667
1668 (((
1669 (% style="background-color:#dcdcdc" %)123456
1670 )))
1671
1672 (((
1673 (% style="background-color:#dcdcdc" %)AT+FDR
1674 )))
1675
1676 (((
1677 (% style="background-color:#dcdcdc" %)123456
1678 )))
1679
1680 (((
1681 (% style="background-color:#dcdcdc" %)AT+NJM=0
1682 )))
1683
1684 (((
1685 (% style="background-color:#dcdcdc" %)ATZ
1686 )))
1687
1688
1689 (((
1690 If device already joined network:
1691 )))
1692
1693 (((
1694 (% style="background-color:#dcdcdc" %)AT+NJM=0
1695 )))
1696
1697 (((
1698 (% style="background-color:#dcdcdc" %)ATZ
1699
1700
1701 )))
1702
1703 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1704
1705 (((
1706 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1707 )))
1708
1709 (((
1710 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1711 )))
1712
1713 (((
1714 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1715 )))
1716
1717 (((
1718 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1719 )))
1720
1721 (((
1722 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1723 )))
1724
1725 (((
1726 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1727 )))
1728
1729 (((
1730 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1731 )))
1732
1733 (((
1734 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1735 )))
1736
1737 (((
1738 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1739 )))
1740
1741 (((
1742 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1743 )))
1744
1745 (((
1746 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1747 )))
1748
1749 (((
1750 (% 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.
1751 )))
1752
1753 (((
1754 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1755 )))
1756
1757 (((
1758 (% style="color:red" %)**Note:**
1759 )))
1760
1761 (((
1762 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1763 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1764 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.
1765 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
1766 )))
1767
1768 (((
1769 [[image:1653359097980-169.png||height="188" width="729"]]
1770 )))
1771
1772 (((
1773
1774 )))
1775
1776 === 4.2.3 Change to Class A ===
1777
1778 If sensor JOINED
1779 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1780 ATZ
1781
1782
1783 = 5. FAQ =
1784
1785 == 5.1 How to upgrade the image? ==
1786
1787 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1788
1789 * Support new features
1790 * For bug fix
1791 * Change LoRaWAN bands.
1792 Below shows the hardware connection for how to upload an image to the LT:
1793 * [[image:1653359603330-121.png]]
1794
1795 (((
1796 **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]].
1797 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1798 **Step3: **Open flashloader; choose the correct COM port to update.
1799 **For LT-22222-L**:
1800 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.
1801 )))
1802
1803 [[image:image-20220524103407-12.png]]
1804
1805 [[image:image-20220524103429-13.png]]
1806
1807 [[image:image-20220524104033-15.png]]
1808
1809 (% 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:
1810
1811 [[image:1653360054704-518.png||height="186" width="745"]]
1812
1813
1814 (((
1815 (((
1816 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1817 )))
1818 )))
1819
1820 (((
1821 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1822
1823
1824 )))
1825
1826 (((
1827 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1828 )))
1829
1830 (((
1831 (((
1832 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1833 )))
1834 )))
1835
1836 (((
1837 (((
1838 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1839 )))
1840 )))
1841
1842 (((
1843 (% 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.
1844 )))
1845
1846 (((
1847 [[image:1653360231087-571.png||height="401" width="727"]]
1848 )))
1849
1850 (((
1851 (% 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.
1852 )))
1853
1854 (((
1855 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1856 )))
1857
1858 (((
1859 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1860 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1861 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1862 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1863 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1864 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1865 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1866 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1867 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1868 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1869 )))
1870
1871 (((
1872 As shown in below:
1873 )))
1874
1875 [[image:1653360498588-932.png||height="485" width="726"]]
1876
1877
1878 == 5.4 Can I see counting event in Serial? ==
1879
1880 (((
1881 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.
1882
1883
1884 == 5.5 Can i use point to point communication for LT-22222-L? ==
1885
1886 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1887
1888
1889 )))
1890
1891 (((
1892 = 6. Trouble Shooting =
1893 )))
1894
1895 (((
1896 (((
1897 == 6.1 Downlink doesn’t work, how to solve it? ==
1898 )))
1899 )))
1900
1901 (((
1902 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1903
1904
1905 )))
1906
1907 (((
1908 == 6.2 Have trouble to upload image. ==
1909 )))
1910
1911 (((
1912 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1913 )))
1914
1915 (((
1916
1917 )))
1918
1919 (((
1920 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1921 )))
1922
1923 (((
1924 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1925 )))
1926
1927 (((
1928
1929 )))
1930
1931 (((
1932 = 7. Order Info =
1933 )))
1934
1935 (((
1936 (((
1937 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1938 )))
1939 )))
1940
1941 (((
1942 (((
1943 (% style="color:#4f81bd" %)**XXX:**
1944 )))
1945 )))
1946
1947 (((
1948 * (((
1949 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1950 )))
1951 )))
1952
1953 (((
1954 * (((
1955 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1956 )))
1957 )))
1958
1959 (((
1960 * (((
1961 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1962 )))
1963 )))
1964
1965 (((
1966 * (((
1967 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1968 )))
1969 )))
1970
1971 (((
1972 * (((
1973 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1974 )))
1975 )))
1976
1977 (((
1978 * (((
1979 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1980 )))
1981 )))
1982
1983 (((
1984 * (((
1985 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1986 )))
1987 )))
1988
1989 (((
1990 * (((
1991 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1992 )))
1993 )))
1994
1995 (((
1996 * (((
1997 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1998
1999
2000 )))
2001
2002 = 8. Packing Info =
2003 )))
2004
2005 (((
2006 (((
2007 **Package Includes**:
2008 )))
2009 )))
2010
2011 (((
2012 (((
2013 * LT-22222-L I/O Controller x 1
2014 * Stick Antenna for LoRa RF part x 1
2015 * Bracket for controller x1
2016 * Program cable x 1
2017 )))
2018 )))
2019
2020 (((
2021 (((
2022 **Dimension and weight**:
2023 )))
2024 )))
2025
2026 (((
2027 (((
2028 * Device Size: 13.5 x 7 x 3 cm
2029 * Device Weight: 105g
2030 * Package Size / pcs : 14.5 x 8 x 5 cm
2031 * Weight / pcs : 170g
2032
2033
2034 )))
2035 )))
2036
2037 (((
2038 = 9. Support =
2039 )))
2040
2041 * (((
2042 (((
2043 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.
2044 )))
2045 )))
2046 * (((
2047 (((
2048 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
2049 )))
2050 )))
2051
2052 (((
2053 (((
2054 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2055
2056
2057 )))
2058
2059 (((
2060 = 10. Reference​​​​​ =
2061
2062 * Product Page:
2063
2064 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]]
2065
2066 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2067 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2068 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2069 )))
2070 )))

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