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Version 77.12 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
342
343 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
344
345 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
346
347 (((
348 Total : 11 bytes payload
349 )))
350
351 [[image:image-20220523180452-3.png]]
352
353 (((
354 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
355 )))
356
357 [[image:image-20220523180506-4.png]]
358
359 * RO is for relay. ROx=1 : close，ROx=0 always open.
360 * FIRST: Indicate this is the first packet after join network.
361 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
362
363 (((
364 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
365 )))
366
367 (((
368 **To use counting mode, please run:**
369 )))
370
371 (% class="box infomessage" %)
372 (((
373 (((
374 **AT+MOD=2**
375 )))
376 )))
377
378 (% class="box infomessage" %)
379 (((
380 (((
381 **ATZ**
382 )))
383 )))
384
385 (((
386 (% style="color:#4f81bd" %)**AT Commands for counting:**
387 )))
388
389 (((
390 **For LT22222-L:**
391 )))
392
393 (% class="box infomessage" %)
394 (((
395 (((
396 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
397 )))
398 )))
399
400 (% class="box infomessage" %)
401 (((
402 (((
403 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
404 )))
405 )))
406
407 (% class="box infomessage" %)
408 (((
409 (((
410 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
411 )))
412 )))
413
414 (% class="box infomessage" %)
415 (((
416 (((
417 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
418 )))
419 )))
420
421 (% class="box infomessage" %)
422 (((
423 (((
424 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
425 )))
426 )))
427
428 (% class="box infomessage" %)
429 (((
430 (((
431 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
432 )))
433 )))
434
435
436 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
437
438 **LT22222-L**: This mode the DI1 is used as a counting pin.
439
440 [[image:image-20220523181246-5.png]]
441
442 (((
443 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
444 )))
445
446 [[image:image-20220523181301-6.png]]
447
448 * RO is for relay. ROx=1 : close，ROx=0 always open.
449 * FIRST: Indicate this is the first packet after join network.
450 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
451
452 (((
453 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
454 )))
455
456 (((
457 **To use counting mode, please run:**
458 )))
459
460 (% class="box infomessage" %)
461 (((
462 (((
463 **AT+MOD=3**
464 )))
465 )))
466
467 (% class="box infomessage" %)
468 (((
469 (((
470 **ATZ**
471 )))
472 )))
473
474 (((
475 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
476
477
478 )))
479
480 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
481
482 **LT22222-L**: This mode the DI1 is used as a counting pin.
483
484 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.
485
486 [[image:image-20220523181903-8.png]]
487
488 (((
489 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
490 )))
491
492 [[image:image-20220523181727-7.png]]
493
494 * RO is for relay. ROx=1 : close，ROx=0 always open.
495 * FIRST: Indicate this is the first packet after join network.
496 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
497
498 (((
499 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
500 )))
501
502 (((
503 **To use this mode, please run:**
504 )))
505
506 (% class="box infomessage" %)
507 (((
508 (((
509 **AT+MOD=4**
510 )))
511 )))
512
513 (% class="box infomessage" %)
514 (((
515 (((
516 **ATZ**
517 )))
518 )))
519
520 (((
521
522 )))
523
524 (((
525 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
526 )))
527
528 (((
529 **Plus below command for AVI1 Counting:**
530 )))
531
532 (% class="box infomessage" %)
533 (((
534 (((
535 **AT+SETCNT=3,60   (set AVI Count to 60)**
536 )))
537 )))
538
539 (% class="box infomessage" %)
540 (((
541 (((
542 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
543 )))
544 )))
545
546 (% class="box infomessage" %)
547 (((
548 (((
549 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
550 )))
551 )))
552
553 (% class="box infomessage" %)
554 (((
555 (((
556 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
557 )))
558 )))
559
560
561 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
562
563 **LT22222-L**: This mode the DI1 is used as a counting pin.
564
565 [[image:image-20220523182334-9.png]]
566
567 (((
568 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
569 )))
570
571 * RO is for relay. ROx=1 : close，ROx=0 always open.
572 * FIRST: Indicate this is the first packet after join network.
573 * (((
574 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
575 )))
576
577 (((
578 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
579 )))
580
581 (((
582 **To use this mode, please run:**
583 )))
584
585 (% class="box infomessage" %)
586 (((
587 (((
588 **AT+MOD=5**
589 )))
590 )))
591
592 (% class="box infomessage" %)
593 (((
594 (((
595 **ATZ**
596 )))
597 )))
598
599 (((
600 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
601
602
603 )))
604
605 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
606
607 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
608
609 For example, if user has configured below commands:
610
611 * **AT+MOD=1 ** **~-~->** The normal working mode
612 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
613
614 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
615
616 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
617 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.**
618
619 **AT Command to set Trigger Condition**:
620
621 (% style="color:#4f81bd" %)**Trigger base on voltage**:
622
623 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
624
625 **Example:**
626
627 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)
628
629 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
630
631
632 (% style="color:#4f81bd" %)**Trigger base on current**:
633
634 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
635
636 **Example:**
637
638 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
639
640
641 (% style="color:#4f81bd" %)**Trigger base on DI status**:
642
643 DI status trigger Flag.
644
645 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
646
647 **Example:**
648
649 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
650
651
652 **Downlink Command to set Trigger Condition**
653
654 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
655
656 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
657
658 AA: Code for this downlink Command:
659
660 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
661
662 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
663
664 yy2 yy2: AC1 or AV1 high limit.
665
666 yy3 yy3: AC2 or AV2 low limit.
667
668 Yy4 yy4: AC2 or AV2 high limit.
669
670 **Example1**: AA 00 13 88 00 00 00 00 00 00
671
672 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
673
674 **Example2**: AA 02 01 00
675
676 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
677
678 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
679
680 MOD6 Payload : total 11 bytes payload
681
682 [[image:image-20220524085923-1.png]]
683
684 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
685
686 [[image:image-20220524090106-2.png]]
687
688 * Each bits shows if the corresponding trigger has been configured.
689
690 **Example:**
691
692 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
693
694
695 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
696
697 [[image:image-20220524090249-3.png]]
698
699 * Each bits shows which status has been trigger on this uplink.
700
701 **Example:**
702
703 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
704
705
706 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
707
708 [[image:image-20220524090456-4.png]]
709
710 * Each bits shows which status has been trigger on this uplink.
711
712 **Example:**
713
714 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
715
716 00000101: Means both DI1 and DI2 trigger are enabled.
717
718
719 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
720
721 Downlink command to poll MOD6 status:
722
723 **AB 06**
724
725 When device got this command, it will send the MOD6 payload.
726
727
728 === 3.3.7 Payload Decoder ===
729
730 (((
731 **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/]]
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 === 3.4.1 Common Commands ===
749
750 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]]
751
752
753 === 3.4.2 Sensor related commands ===
754
755 ==== 3.4.2.1 Set Transmit Interval ====
756
757 Set device uplink interval.
758
759 * AT Command:
760
761 (% class="box infomessage" %)
762 (((
763 **AT+TDC=N **
764 )))
765
766 **Example: **AT+TDC=30000. Means set interval to 30 seconds
767
768 * Downlink Payload (prefix 0x01):
769
770 (% class="box infomessage" %)
771 (((
772 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
773 )))
774
775
776 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
777
778 Set work mode.
779
780 * AT Command:
781
782 (% class="box infomessage" %)
783 (((
784 **AT+MOD=N  **
785 )))
786
787 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
788
789 * Downlink Payload (prefix 0x0A):
790
791 (% class="box infomessage" %)
792 (((
793 **0x0A aa     ~/~/ Same as AT+MOD=aa**
794 )))
795
796
797 ==== 3.4.2.3 Poll an uplink ====
798
799 * AT Command:
800
801 There is no AT Command to poll uplink
802
803 * Downlink Payload (prefix 0x08):
804
805 (% class="box infomessage" %)
806 (((
807 **0x08 FF     ~/~/ Poll an uplink,**
808 )))
809
810 **Example**: 0x08FF, ask device to send an Uplink
811
812
813 ==== 3.4.2.4 Enable Trigger Mode ====
814
815 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
816
817 * AT Command:
818
819 (% class="box infomessage" %)
820 (((
821 **AT+ADDMOD6=1 or 0**
822 )))
823
824 1: Enable Trigger Mode
825
826 0: Disable Trigger Mode
827
828 * Downlink Payload (prefix 0x0A 06):
829
830 (% class="box infomessage" %)
831 (((
832 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
833 )))
834
835
836 ==== 3.4.2.5 Poll trigger settings ====
837
838 Poll trigger settings,
839
840 * AT Command:
841
842 There is no AT Command for this feature.
843
844 * Downlink Payload (prefix 0x AB 06):
845
846 (% class="box infomessage" %)
847 (((
848 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
849 )))
850
851
852 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
853
854 Enable Disable DI1/DI2/DI2 as trigger,
855
856 * AT Command:
857
858 (% class="box infomessage" %)
859 (((
860 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
861 )))
862
863 **Example:**
864
865 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
866
867 * Downlink Payload (prefix 0xAA 02):
868
869 (% class="box infomessage" %)
870 (((
871 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
872 )))
873
874
875 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
876
877 Set DI1 or DI3(for LT-33222-L) trigger.
878
879 * AT Command:
880
881 (% class="box infomessage" %)
882 (((
883 **AT+TRIG1=a,b**
884 )))
885
886 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
887
888 b : delay timing.
889
890 **Example:**
891
892 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
893
894 * Downlink Payload (prefix 0x09 01 ):
895
896 (% class="box infomessage" %)
897 (((
898 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
899 )))
900
901
902 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
903
904 Set DI2 trigger.
905
906 * AT Command:
907
908 (% class="box infomessage" %)
909 (((
910 **AT+TRIG2=a,b**
911 )))
912
913 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
914
915 b : delay timing.
916
917 **Example:**
918
919 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
920
921 * Downlink Payload (prefix 0x09 02 ):
922
923 (% class="box infomessage" %)
924 (((
925 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
926 )))
927
928
929 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
930
931 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
932
933 * AT Command:
934
935 (% class="box infomessage" %)
936 (((
937 **AT+ACLIM. **
938 )))
939
940 * Downlink Payload (prefix 0xAA 01 ):
941
942 (% class="box infomessage" %)
943 (((
944 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
945 )))
946
947
948 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
949
950 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
951
952 * AT Command:
953
954 (% class="box infomessage" %)
955 (((
956 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
957 )))
958
959 * Downlink Payload (prefix 0xAA 00 ):
960
961 (% class="box infomessage" %)
962 (((
963 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
964 )))
965
966
967 ==== 3.4.2.11 Trigger – Set minimum interval ====
968
969 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
970
971 * AT Command:
972
973 (% class="box infomessage" %)
974 (((
975 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
976 )))
977
978 * Downlink Payload (prefix 0xAC ):
979
980 (% class="box infomessage" %)
981 (((
982 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
983 )))
984
985
986 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
987
988 * AT Command:
989
990 There is no AT Command to control Digital Output
991
992 * Downlink Payload (prefix 0x02):
993
994 (% class="box infomessage" %)
995 (((
996 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
997 )))
998
999 (((
1000 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1001 )))
1002
1003 (((
1004 01: Low,  00: High ,  11: No action
1005 )))
1006
1007 [[image:image-20220524092754-5.png]]
1008
1009 (((
1010 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1011 )))
1012
1013 (((
1014 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1015 )))
1016
1017
1018 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1019
1020 * AT Command:
1021
1022 There is no AT Command to control Digital Output
1023
1024 * Downlink Payload (prefix 0xA9):
1025
1026 (% class="box infomessage" %)
1027 (((
1028 (((
1029 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1030 )))
1031 )))
1032
1033 This is to control the digital output time of DO pin. Include four bytes:
1034
1035 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1036
1037 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1038
1039 01: DO pins will change back to original state after timeout.
1040
1041 00: DO pins will change to an inverter state after timeout 
1042
1043 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1044
1045 [[image:image-20220524093238-6.png]]
1046
1047 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1048
1049 [[image:image-20220524093328-7.png]]
1050
1051 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1052
1053 [[image:image-20220524093351-8.png]]
1054
1055 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1056
1057 Latching time. Unit: ms
1058
1059 Device will upload a packet if downlink code executes successfully.
1060
1061 **Example payload:**
1062
1063 **~1. A9 01 01 01 01 07 D0**
1064
1065 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1066
1067 **2. A9 01 00 01 11 07 D0**
1068
1069 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1070
1071 **3. A9 00 00 00 00 07 D0**
1072
1073 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1074
1075 **4. A9 00 11 01 00 07 D0**
1076
1077 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
1078
1079
1080 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1081
1082 * AT Command:
1083
1084 There is no AT Command to control Relay Output
1085
1086 * Downlink Payload (prefix 0x03):
1087
1088 (% class="box infomessage" %)
1089 (((
1090 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1091 )))
1092
1093 (((
1094 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1095 )))
1096
1097 (((
1098 01: Close ,  00: Open , 11: No action
1099 )))
1100
1101 (((
1102 [[image:image-20220524093724-9.png]]
1103 )))
1104
1105 Device will upload a packet if downlink code executes successfully.
1106
1107
1108 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1109
1110 * AT Command:
1111
1112 There is no AT Command to control Relay Output
1113
1114 * Downlink Payload (prefix 0x05):
1115
1116 (% class="box infomessage" %)
1117 (((
1118 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1119 )))
1120
1121 This is to control the relay output time of relay. Include four bytes:
1122
1123 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1124
1125 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1126
1127 01: Relays will change back to original state after timeout.
1128
1129 00: Relays will change to an inverter state after timeout
1130
1131 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1132
1133 [[image:image-20220524093831-10.png]]
1134
1135 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1136
1137 Device will upload a packet if downlink code executes successfully.
1138
1139 **Example payload:**
1140
1141 **~1. 05 01 11 07 D0**
1142
1143 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1144
1145 **2. 05 01 10 07 D0**
1146
1147 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1148
1149 **3. 05 00 01 07 D0**
1150
1151 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1152
1153 **4. 05 00 00 07 D0**
1154
1155 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1156
1157
1158 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1159
1160 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1161
1162 * AT Command:
1163
1164 (% class="box infomessage" %)
1165 (((
1166 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1167 )))
1168
1169 * Downlink Payload (prefix 0xA5):
1170
1171 (% class="box infomessage" %)
1172 (((
1173 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1174 )))
1175
1176
1177 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1178
1179 * AT Command:
1180
1181 (% class="box infomessage" %)
1182 (((
1183 **AT+SETCNT=aa,(bb cc dd ee) **
1184 )))
1185
1186 aa: 1: Set count1,
1187
1188 2: Set count2,
1189
1190 3: Set AV1 count
1191
1192 Bb cc dd ee: number to be set
1193
1194 * Downlink Payload (prefix 0xA8):
1195
1196 (% class="box infomessage" %)
1197 (((
1198 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1199 )))
1200
1201
1202 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1203
1204 Clear counting for counting mode
1205
1206 * AT Command:
1207
1208 (% class="box infomessage" %)
1209 (((
1210 **AT+CLRCOUNT ~/~/ clear all counting**
1211 )))
1212
1213 * Downlink Payload (prefix 0xA6):
1214
1215 (% class="box infomessage" %)
1216 (((
1217 **0x A6 01     ~/~/ clear all counting,**
1218 )))
1219
1220
1221 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1222
1223 * AT Command:
1224
1225 (% class="box infomessage" %)
1226 (((
1227 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1228 )))
1229
1230 * Downlink Payload (prefix 0xA7):
1231
1232 (% class="box infomessage" %)
1233 (((
1234 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1235 )))
1236
1237 (((
1238 range: aa bb cc:0 to 16777215,  (unit:second)
1239
1240
1241 )))
1242
1243 == 3.5 Integrate with Mydevice ==
1244
1245 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:
1246
1247 (((
1248 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1249 )))
1250
1251 (((
1252 **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:
1253 )))
1254
1255 [[image:1653356737703-362.png||height="232" width="732"]]
1256
1257 [[image:image-20220524094641-11.png||height="390" width="723"]]
1258
1259 [[image:image-20220524094641-12.png||height="402" width="718"]]
1260
1261
1262 **Step 3**: Create an account or log in Mydevices.
1263
1264 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1265
1266 Search under The things network
1267
1268 [[image:1653356838789-523.png||height="337" width="740"]]
1269
1270
1271 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1272
1273 [[image:image-20220524094909-1.png||height="335" width="729"]]
1274
1275 [[image:image-20220524094909-2.png||height="337" width="729"]]
1276
1277 [[image:image-20220524094909-3.png||height="338" width="727"]]
1278
1279 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1280
1281 [[image:image-20220524094909-5.png||height="341" width="734"]]
1282
1283
1284 == 3.6 Interface Detail ==
1285
1286 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1287
1288 Support NPN Type sensor
1289
1290 [[image:1653356991268-289.png]]
1291
1292
1293 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1294
1295 (((
1296 The DI port of LT-22222-L can support NPN or PNP output sensor.
1297 )))
1298
1299 (((
1300 (((
1301 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
1302 )))
1303 )))
1304
1305 [[image:1653357170703-587.png]]
1306
1307 (((
1308 (((
1309 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1310 )))
1311 )))
1312
1313 (((
1314
1315 )))
1316
1317 (((
1318 **Example1**: Connect to a Low active sensor.
1319 )))
1320
1321 (((
1322 This type of sensor will output a low signal GND when active.
1323 )))
1324
1325 * (((
1326 Connect sensor’s output to DI1-
1327 )))
1328 * (((
1329 Connect sensor’s VCC to DI1+.
1330 )))
1331
1332 (((
1333 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1334 )))
1335
1336 (((
1337 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1338 )))
1339
1340 (((
1341 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.
1342 )))
1343
1344 (((
1345
1346 )))
1347
1348 (((
1349 **Example2**: Connect to a High active sensor.
1350 )))
1351
1352 (((
1353 This type of sensor will output a high signal (example 24v) when active.
1354 )))
1355
1356 * (((
1357 Connect sensor’s output to DI1+
1358 )))
1359 * (((
1360 Connect sensor’s GND DI1-.
1361 )))
1362
1363 (((
1364 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1365 )))
1366
1367 (((
1368 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1369 )))
1370
1371 (((
1372 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.
1373 )))
1374
1375 (((
1376
1377 )))
1378
1379 (((
1380 **Example3**: Connect to a 220v high active sensor.
1381 )))
1382
1383 (((
1384 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1385 )))
1386
1387 * (((
1388 Connect sensor’s output to DI1+ with a serial 50K resistor
1389 )))
1390 * (((
1391 Connect sensor’s GND DI1-.
1392 )))
1393
1394 (((
1395 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1396 )))
1397
1398 (((
1399 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1400 )))
1401
1402 (((
1403 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.
1404 )))
1405
1406
1407 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1408
1409 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1410
1411 [[image:1653357531600-905.png]]
1412
1413
1414 === 3.6.4 Analog Input Interface ===
1415
1416 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:
1417
1418 **AC2 = (IN2 voltage )/12**
1419
1420 [[image:1653357592296-182.png]]
1421
1422 Example to connect a 4~~20mA sensor
1423
1424 We take the wind speed sensor as an example for reference only.
1425
1426 Specifications of the wind speed sensor:
1427
1428 Red:12~~24v
1429
1430 Yellow:4~~20mA
1431
1432 Black:GND
1433
1434
1435 Connection diagram:
1436
1437 [[image:1653357640609-758.png]]
1438
1439 [[image:1653357648330-671.png||height="155" width="733"]]
1440
1441
1442 === 3.6.5 Relay Output ===
1443
1444 (((
1445 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:
1446 )))
1447
1448 [[image:image-20220524100215-9.png]]
1449
1450 [[image:image-20220524100215-10.png||height="382" width="723"]]
1451
1452
1453 == 3.7 LEDs Indicators ==
1454
1455 [[image:image-20220524100748-11.png]]
1456
1457
1458 = 4. Use AT Command =
1459
1460 == 4.1 Access AT Command ==
1461
1462 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.
1463
1464 [[image:1653358238933-385.png]]
1465
1466 (((
1467 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:
1468 )))
1469
1470 [[image:1653358355238-883.png]]
1471
1472 (((
1473 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/]]
1474 )))
1475
1476 (((
1477 AT+<CMD>?        : Help on <CMD>
1478 )))
1479
1480 (((
1481 AT+<CMD>         : Run <CMD>
1482 )))
1483
1484 (((
1485 AT+<CMD>=<value> : Set the value
1486 )))
1487
1488 (((
1489 AT+<CMD>=?       : Get the value
1490 )))
1491
1492 (((
1493 ATZ: Trig a reset of the MCU
1494 )))
1495
1496 (((
1497 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1498 )))
1499
1500 (((
1501 AT+DEUI: Get or Set the Device EUI
1502 )))
1503
1504 (((
1505 AT+DADDR: Get or Set the Device Address
1506 )))
1507
1508 (((
1509 AT+APPKEY: Get or Set the Application Key
1510 )))
1511
1512 (((
1513 AT+NWKSKEY: Get or Set the Network Session Key
1514 )))
1515
1516 (((
1517 AT+APPSKEY: Get or Set the Application Session Key
1518 )))
1519
1520 (((
1521 AT+APPEUI: Get or Set the Application EUI
1522 )))
1523
1524 (((
1525 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1526 )))
1527
1528 (((
1529 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1530 )))
1531
1532 (((
1533 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1534 )))
1535
1536 (((
1537 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1538 )))
1539
1540 (((
1541 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1542 )))
1543
1544 (((
1545 AT+RX2FQ: Get or Set the Rx2 window frequency
1546 )))
1547
1548 (((
1549 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1550 )))
1551
1552 (((
1553 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1554 )))
1555
1556 (((
1557 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1558 )))
1559
1560 (((
1561 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1562 )))
1563
1564 (((
1565 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1566 )))
1567
1568 (((
1569 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1570 )))
1571
1572 (((
1573 AT+NWKID: Get or Set the Network ID
1574 )))
1575
1576 (((
1577 AT+FCU: Get or Set the Frame Counter Uplink
1578 )))
1579
1580 (((
1581 AT+FCD: Get or Set the Frame Counter Downlink
1582 )))
1583
1584 (((
1585 AT+CLASS: Get or Set the Device Class
1586 )))
1587
1588 (((
1589 AT+JOIN: Join network
1590 )))
1591
1592 (((
1593 AT+NJS: Get OTAA Join Status
1594 )))
1595
1596 (((
1597 AT+SENDB: Send hexadecimal data along with the application port
1598 )))
1599
1600 (((
1601 AT+SEND: Send text data along with the application port
1602 )))
1603
1604 (((
1605 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1606 )))
1607
1608 (((
1609 AT+RECV: Print last received data in raw format
1610 )))
1611
1612 (((
1613 AT+VER: Get current image version and Frequency Band
1614 )))
1615
1616 (((
1617 AT+CFM: Get or Set the confirmation mode (0-1)
1618 )))
1619
1620 (((
1621 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1622 )))
1623
1624 (((
1625 AT+SNR: Get the SNR of the last received packet
1626 )))
1627
1628 (((
1629 AT+RSSI: Get the RSSI of the last received packet
1630 )))
1631
1632 (((
1633 AT+TDC: Get or set the application data transmission interval in ms
1634 )))
1635
1636 (((
1637 AT+PORT: Get or set the application port
1638 )))
1639
1640 (((
1641 AT+DISAT: Disable AT commands
1642 )))
1643
1644 (((
1645 AT+PWORD: Set password, max 9 digits
1646 )))
1647
1648 (((
1649 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1650 )))
1651
1652 (((
1653 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1654 )))
1655
1656 (((
1657 AT+CFG: Print all settings
1658
1659
1660 )))
1661
1662 == 4.2 Common AT Command Sequence ==
1663
1664 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1665
1666 (((
1667 If device has not joined network yet:
1668 )))
1669
1670 (((
1671 (% style="background-color:#dcdcdc" %)123456
1672 )))
1673
1674 (((
1675 (% style="background-color:#dcdcdc" %)AT+FDR
1676 )))
1677
1678 (((
1679 (% style="background-color:#dcdcdc" %)123456
1680 )))
1681
1682 (((
1683 (% style="background-color:#dcdcdc" %)AT+NJM=0
1684 )))
1685
1686 (((
1687 (% style="background-color:#dcdcdc" %)ATZ
1688 )))
1689
1690
1691 (((
1692 If device already joined network:
1693 )))
1694
1695 (((
1696 (% style="background-color:#dcdcdc" %)AT+NJM=0
1697 )))
1698
1699 (((
1700 (% style="background-color:#dcdcdc" %)ATZ
1701
1702
1703 )))
1704
1705 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1706
1707 (((
1708 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1709 )))
1710
1711 (((
1712 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1713 )))
1714
1715 (((
1716 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1717 )))
1718
1719 (((
1720 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1721 )))
1722
1723 (((
1724 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1725 )))
1726
1727 (((
1728 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1729 )))
1730
1731 (((
1732 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1733 )))
1734
1735 (((
1736 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1737 )))
1738
1739 (((
1740 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1741 )))
1742
1743 (((
1744 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1745 )))
1746
1747 (((
1748 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1749 )))
1750
1751 (((
1752 (% 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.
1753 )))
1754
1755 (((
1756 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1757 )))
1758
1759 (((
1760 (% style="color:red" %)**Note:**
1761 )))
1762
1763 (((
1764 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1765 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1766 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.
1767 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
1768 )))
1769
1770 (((
1771 [[image:1653359097980-169.png||height="188" width="729"]]
1772 )))
1773
1774 (((
1775
1776 )))
1777
1778 === 4.2.3 Change to Class A ===
1779
1780 If sensor JOINED
1781 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1782 ATZ
1783
1784
1785 = 5. FAQ =
1786
1787 == 5.1 How to upgrade the image? ==
1788
1789 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1790
1791 * Support new features
1792 * For bug fix
1793 * Change LoRaWAN bands.
1794 Below shows the hardware connection for how to upload an image to the LT:
1795 * [[image:1653359603330-121.png]]
1796
1797 (((
1798 **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]].
1799 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1800 **Step3: **Open flashloader; choose the correct COM port to update.
1801 **For LT-22222-L**:
1802 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.
1803 )))
1804
1805 [[image:image-20220524103407-12.png]]
1806
1807 [[image:image-20220524103429-13.png]]
1808
1809 [[image:image-20220524104033-15.png]]
1810
1811 (% 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:
1812
1813 [[image:1653360054704-518.png||height="186" width="745"]]
1814
1815
1816 (((
1817 (((
1818 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1819 )))
1820 )))
1821
1822 (((
1823 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1824
1825
1826 )))
1827
1828 (((
1829 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1830 )))
1831
1832 (((
1833 (((
1834 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1835 )))
1836 )))
1837
1838 (((
1839 (((
1840 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1841 )))
1842 )))
1843
1844 (((
1845 (% 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.
1846 )))
1847
1848 (((
1849 [[image:1653360231087-571.png||height="401" width="727"]]
1850 )))
1851
1852 (((
1853 (% 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.
1854 )))
1855
1856 (((
1857 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1858 )))
1859
1860 (((
1861 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1862 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1863 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1864 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1865 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1866 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1867 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1868 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1869 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1870 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1871 )))
1872
1873 (((
1874 As shown in below:
1875 )))
1876
1877 [[image:1653360498588-932.png||height="485" width="726"]]
1878
1879
1880 == 5.4 Can I see counting event in Serial? ==
1881
1882 (((
1883 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.
1884
1885
1886 == 5.5 Can i use point to point communication for LT-22222-L? ==
1887
1888 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1889
1890
1891 )))
1892
1893 (((
1894 = 6. Trouble Shooting =
1895 )))
1896
1897 (((
1898 (((
1899 == 6.1 Downlink doesn’t work, how to solve it? ==
1900 )))
1901 )))
1902
1903 (((
1904 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1905
1906
1907 )))
1908
1909 (((
1910 == 6.2 Have trouble to upload image. ==
1911 )))
1912
1913 (((
1914 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1915 )))
1916
1917 (((
1918
1919 )))
1920
1921 (((
1922 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1923 )))
1924
1925 (((
1926 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1927 )))
1928
1929 (((
1930
1931 )))
1932
1933 (((
1934 = 7. Order Info =
1935 )))
1936
1937 (((
1938 (((
1939 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1940 )))
1941 )))
1942
1943 (((
1944 (((
1945 (% style="color:#4f81bd" %)**XXX:**
1946 )))
1947 )))
1948
1949 (((
1950 * (((
1951 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1952 )))
1953 )))
1954
1955 (((
1956 * (((
1957 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1958 )))
1959 )))
1960
1961 (((
1962 * (((
1963 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1964 )))
1965 )))
1966
1967 (((
1968 * (((
1969 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1970 )))
1971 )))
1972
1973 (((
1974 * (((
1975 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1976 )))
1977 )))
1978
1979 (((
1980 * (((
1981 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1982 )))
1983 )))
1984
1985 (((
1986 * (((
1987 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1988 )))
1989 )))
1990
1991 (((
1992 * (((
1993 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1994 )))
1995 )))
1996
1997 (((
1998 * (((
1999 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2000
2001
2002 )))
2003
2004 = 8. Packing Info =
2005 )))
2006
2007 (((
2008 (((
2009 **Package Includes**:
2010 )))
2011 )))
2012
2013 (((
2014 (((
2015 * LT-22222-L I/O Controller x 1
2016 * Stick Antenna for LoRa RF part x 1
2017 * Bracket for controller x1
2018 * Program cable x 1
2019 )))
2020 )))
2021
2022 (((
2023 (((
2024 **Dimension and weight**:
2025 )))
2026 )))
2027
2028 (((
2029 (((
2030 * Device Size: 13.5 x 7 x 3 cm
2031 * Device Weight: 105g
2032 * Package Size / pcs : 14.5 x 8 x 5 cm
2033 * Weight / pcs : 170g
2034
2035
2036 )))
2037 )))
2038
2039 (((
2040 = 9. Support =
2041 )))
2042
2043 * (((
2044 (((
2045 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.
2046 )))
2047 )))
2048 * (((
2049 (((
2050 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
2051 )))
2052 )))
2053
2054 (((
2055 (((
2056 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2057
2058
2059 )))
2060
2061 (((
2062 = 10. Reference​​​​​ =
2063
2064 * Product Page:
2065
2066 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]]
2067
2068 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2069 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2070 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2071 )))
2072 )))