Version 77.4 by Xiaoling on 2022/06/10 08:38
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1 (% style="text-align:center" %)
2 [[image:image-20220523163353-1.jpeg||height="604" width="500"]]
3
4 **LT-22222-L LoRa IO Controller User Manual **
5
6
7 **Table of Contents:**
8
9 {{toc/}}
10
11
12
13
14
15
16
17 = 1.Introduction =
18
19 == 1.1 What is LT Series I/O Controller ==
20
21 (((
22 The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
23 )))
24
25 (((
26 The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
27 )))
28
29 (((
30 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
31 )))
32
33 (((
34 The use environment includes:
35 )))
36
37 (((
38 1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.
39 )))
40
41 (((
42 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
43 )))
44
45 (((
46 [[image:1653295757274-912.png]]
47
48
49 )))
50
51 == 1.2  Specifications ==
52
53 (((
54
55
56 **Hardware System:**
57 )))
58
59 * (((
60 STM32L072CZT6 MCU
61 )))
62 * (((
63 SX1276/78 Wireless Chip 
64 )))
65 * (((
66 (((
67 Power Consumption:
68 )))
69
70 * (((
71 Idle: 4mA@12v
72 )))
73 * (((
74 20dB Transmit: 34mA@12v
75 )))
76 )))
77
78
79 (((
80 **Interface for Model: LT22222-L:**
81 )))
82
83 * (((
84 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
85 )))
86 * (((
87 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
88 )))
89 * (((
90 2 x Relay Output (5A@250VAC / 30VDC)
91 )))
92 * (((
93 2 x 0~~20mA Analog Input (res:0.01mA)
94 )))
95 * (((
96 2 x 0~~30V Analog Input (res:0.01v)
97 )))
98 * (((
99 Power Input 7~~ 24V DC. 
100 )))
101
102
103 (((
104 **LoRa Spec:**
105 )))
106
107 * (((
108 (((
109 Frequency Range:
110 )))
111
112 * (((
113 Band 1 (HF): 862 ~~ 1020 Mhz
114 )))
115 * (((
116 Band 2 (LF): 410 ~~ 528 Mhz
117 )))
118 )))
119 * (((
120 168 dB maximum link budget.
121 )))
122 * (((
123 +20 dBm - 100 mW constant RF output vs.
124 )))
125 * (((
126 +14 dBm high efficiency PA.
127 )))
128 * (((
129 Programmable bit rate up to 300 kbps.
130 )))
131 * (((
132 High sensitivity: down to -148 dBm.
133 )))
134 * (((
135 Bullet-proof front end: IIP3 = -12.5 dBm.
136 )))
137 * (((
138 Excellent blocking immunity.
139 )))
140 * (((
141 Low RX current of 10.3 mA, 200 nA register retention.
142 )))
143 * (((
144 Fully integrated synthesizer with a resolution of 61 Hz.
145 )))
146 * (((
147 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
148 )))
149 * (((
150 Built-in bit synchronizer for clock recovery.
151 )))
152 * (((
153 Preamble detection.
154 )))
155 * (((
156 127 dB Dynamic Range RSSI.
157 )))
158 * (((
159 Automatic RF Sense and CAD with ultra-fast AFC.
160 )))
161 * (((
162 Packet engine up to 256 bytes with CRC.
163
164
165 )))
166
167
168
169 == 1.3 Features ==
170
171 * LoRaWAN Class A & Class C protocol
172 * Optional Customized LoRa Protocol
173 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
174 * AT Commands to change parameters
175 * Remote configure parameters via LoRa Downlink
176 * Firmware upgradable via program port
177 * Counting
178
179
180
181 == 1.4  Applications ==
182
183 * Smart Buildings & Home Automation
184 * Logistics and Supply Chain Management
185 * Smart Metering
186 * Smart Agriculture
187 * Smart Cities
188 * Smart Factory
189
190 == 1.5 Hardware Variants ==
191
192 (% border="1" style="background-color:#f7faff; width:500px" %)
193 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
194 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
195 * 2 x Digital Input (Bi-direction)
196 * 2 x Digital Output
197 * 2 x Relay Output (5A@250VAC / 30VDC)
198 * 2 x 0~~20mA Analog Input (res:0.01mA)
199 * 2 x 0~~30V Analog Input (res:0.01v)
200 * 1 x Counting Port
201 )))
202
203 = 2. Power ON Device =
204
205 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.
206
207 (((
208 PWR will on when device is properly powered.
209 )))
210
211 [[image:1653297104069-180.png]]
212
213
214 = 3. Operation Mode =
215
216 == 3.1 How it works? ==
217
218 (((
219 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. 
220 )))
221
222 (((
223 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.
224
225
226 )))
227
228 == 3.2 Example to join LoRaWAN network ==
229
230 (((
231 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. 
232 )))
233
234 [[image:image-20220523172350-1.png||height="266" width="864"]]
235
236 (((
237 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:
238 )))
239
240 (((
241 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
242 )))
243
244 (((
245 Each LT is shipped with a sticker with the default device EUI as below:
246 )))
247
248 [[image:1653297924498-393.png]]
249
250 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
251
252 Add APP EUI in the application.
253
254 [[image:1653297955910-247.png||height="321" width="716"]]
255
256
257 Add APP KEY and DEV EUI
258
259 [[image:1653298023685-319.png]]
260
261
262 (((
263 **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.
264 )))
265
266 [[image:1653298044601-602.png||height="405" width="709"]]
267
268
269 == 3.3 Uplink Payload ==
270
271 There are five working modes + one interrupt mode on LT for different type application:
272
273 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
274 * **MOD2**: Double DI Counting + DO + RO
275 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
276 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
277 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
278 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
279
280 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
281
282 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
283
284 [[image:image-20220523174024-3.png]]
285
286 (((
287 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
288 )))
289
290 [[image:image-20220523174254-4.png]]
291
292 * RO is for relay. ROx=1 : close，ROx=0 always open.
293 * DI is for digital input. DIx=1: high or float, DIx=0: low.
294 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
295
296 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
297
298 For example if payload is: [[image:image-20220523175847-2.png]]
299
300 **The value for the interface is:  **
301
302 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
303
304 AVI2 channel voltage is 0x04AC/1000=1.196V
305
306 ACI1 channel current is 0x1310/1000=4.880mA
307
308 ACI2 channel current is 0x1300/1000=4.864mA
309
310 The last byte 0xAA= 10101010(B) means
311
312 * [1] RO1 relay channel is close and the RO1 LED is ON.
313 * [0] RO2 relay channel is open and RO2 LED is OFF;
314
315 **LT22222-L:**
316
317 * [1] DI2 channel is high input and DI2 LED is ON;
318 * [0] DI1 channel is low input;
319
320 * [0] DO3 channel output state
321 ** DO3 is float in case no load between DO3 and V+.;
322 ** DO3 is high in case there is load between DO3 and V+.
323 ** DO3 LED is off in both case
324 * [1] DO2 channel output is low and DO2 LED is ON.
325 * [0] DO1 channel output state
326 ** DO1 is float in case no load between DO1 and V+.;
327 ** DO1 is high in case there is load between DO1 and V+.
328 ** DO1 LED is off in both case
329
330 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
331
332 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
333
334 (((
335 Total : 11 bytes payload
336 )))
337
338 [[image:image-20220523180452-3.png]]
339
340 (((
341 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
342 )))
343
344 [[image:image-20220523180506-4.png]]
345
346 * RO is for relay. ROx=1 : close，ROx=0 always open.
347 * FIRST: Indicate this is the first packet after join network.
348 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
349
350 (((
351 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
352 )))
353
354 (((
355 **To use counting mode, please run:**
356 )))
357
358 (% class="box infomessage" %)
359 (((
360 (((
361 **AT+MOD=2**
362 )))
363 )))
364
365 (% class="box infomessage" %)
366 (((
367 (((
368 **ATZ**
369 )))
370 )))
371
372 (((
373 (% style="color:#4f81bd" %)**AT Commands for counting:**
374 )))
375
376 (((
377 **For LT22222-L:**
378 )))
379
380 (% class="box infomessage" %)
381 (((
382 (((
383 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
384 )))
385 )))
386
387 (% class="box infomessage" %)
388 (((
389 (((
390 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
391 )))
392 )))
393
394 (% class="box infomessage" %)
395 (((
396 (((
397 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
398 )))
399 )))
400
401 (% class="box infomessage" %)
402 (((
403 (((
404 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
405 )))
406 )))
407
408 (% class="box infomessage" %)
409 (((
410 (((
411 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
412 )))
413 )))
414
415 (% class="box infomessage" %)
416 (((
417 (((
418 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
419 )))
420 )))
421
422
423 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
424
425 **LT22222-L**: This mode the DI1 is used as a counting pin.
426
427 [[image:image-20220523181246-5.png]]
428
429 (((
430 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
431 )))
432
433 [[image:image-20220523181301-6.png]]
434
435 * RO is for relay. ROx=1 : close，ROx=0 always open.
436 * FIRST: Indicate this is the first packet after join network.
437 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
438
439 (((
440 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
441 )))
442
443 (((
444 **To use counting mode, please run:**
445 )))
446
447 (% class="box infomessage" %)
448 (((
449 (((
450 **AT+MOD=3**
451 )))
452 )))
453
454 (% class="box infomessage" %)
455 (((
456 (((
457 **ATZ**
458 )))
459 )))
460
461 (((
462 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
463
464
465 )))
466
467 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
468
469 **LT22222-L**: This mode the DI1 is used as a counting pin.
470
471 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.
472
473 [[image:image-20220523181903-8.png]]
474
475 (((
476 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
477 )))
478
479 [[image:image-20220523181727-7.png]]
480
481 * RO is for relay. ROx=1 : close，ROx=0 always open.
482 * FIRST: Indicate this is the first packet after join network.
483 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
484
485 (((
486 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
487 )))
488
489 (((
490 **To use this mode, please run:**
491 )))
492
493 (% class="box infomessage" %)
494 (((
495 (((
496 **AT+MOD=4**
497 )))
498 )))
499
500 (% class="box infomessage" %)
501 (((
502 (((
503 **ATZ**
504 )))
505 )))
506
507 (((
508
509 )))
510
511 (((
512 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
513 )))
514
515 (((
516 **Plus below command for AVI1 Counting:**
517 )))
518
519 (% class="box infomessage" %)
520 (((
521 (((
522 **AT+SETCNT=3,60   (set AVI Count to 60)**
523 )))
524 )))
525
526 (% class="box infomessage" %)
527 (((
528 (((
529 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
530 )))
531 )))
532
533 (% class="box infomessage" %)
534 (((
535 (((
536 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
537 )))
538 )))
539
540 (% class="box infomessage" %)
541 (((
542 (((
543 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
544 )))
545 )))
546
547
548 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
549
550 **LT22222-L**: This mode the DI1 is used as a counting pin.
551
552 [[image:image-20220523182334-9.png]]
553
554 (((
555 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
556 )))
557
558 * RO is for relay. ROx=1 : close，ROx=0 always open.
559 * FIRST: Indicate this is the first packet after join network.
560 * (((
561 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
562 )))
563
564 (((
565 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
566 )))
567
568 (((
569 **To use this mode, please run:**
570 )))
571
572 (% class="box infomessage" %)
573 (((
574 (((
575 **AT+MOD=5**
576 )))
577 )))
578
579 (% class="box infomessage" %)
580 (((
581 (((
582 **ATZ**
583 )))
584 )))
585
586 (((
587 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
588
589
590 )))
591
592 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
593
594 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
595
596 For example, if user has configured below commands:
597
598 * **AT+MOD=1 ** **~-~->** The normal working mode
599 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
600
601 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
602
603 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
604 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.**
605
606 **AT Command to set Trigger Condition**:
607
608 (% style="color:#4f81bd" %)**Trigger base on voltage**:
609
610 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
611
612 **Example:**
613
614 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)
615
616 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
617
618
619 (% style="color:#4f81bd" %)**Trigger base on current**:
620
621 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
622
623 **Example:**
624
625 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
626
627
628 (% style="color:#4f81bd" %)**Trigger base on DI status**:
629
630 DI status trigger Flag.
631
632 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
633
634 **Example:**
635
636 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
637
638
639 **Downlink Command to set Trigger Condition**
640
641 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
642
643 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
644
645 AA: Code for this downlink Command:
646
647 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
648
649 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
650
651 yy2 yy2: AC1 or AV1 high limit.
652
653 yy3 yy3: AC2 or AV2 low limit.
654
655 Yy4 yy4: AC2 or AV2 high limit.
656
657 **Example1**: AA 00 13 88 00 00 00 00 00 00
658
659 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
660
661 **Example2**: AA 02 01 00
662
663 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
664
665 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
666
667 MOD6 Payload : total 11 bytes payload
668
669 [[image:image-20220524085923-1.png]]
670
671 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
672
673 [[image:image-20220524090106-2.png]]
674
675 * Each bits shows if the corresponding trigger has been configured.
676
677 **Example:**
678
679 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
680
681
682 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
683
684 [[image:image-20220524090249-3.png]]
685
686 * Each bits shows which status has been trigger on this uplink.
687
688 **Example:**
689
690 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
691
692
693 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
694
695 [[image:image-20220524090456-4.png]]
696
697 * Each bits shows which status has been trigger on this uplink.
698
699 **Example:**
700
701 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
702
703 00000101: Means both DI1 and DI2 trigger are enabled.
704
705
706 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
707
708 Downlink command to poll MOD6 status:
709
710 **AB 06**
711
712 When device got this command, it will send the MOD6 payload.
713
714
715 === 3.3.7 Payload Decoder ===
716
717 (((
718 **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/]]
719
720
721 )))
722
723 == 3.4 ​Configure LT via AT or Downlink ==
724
725 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
726
727 (((
728 There are two kinds of Commands:
729 )))
730
731 * (% 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]]
732
733 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
734
735 === 3.4.1 Common Commands ===
736
737 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]]
738
739
740 === 3.4.2 Sensor related commands ===
741
742 ==== 3.4.2.1 Set Transmit Interval ====
743
744 Set device uplink interval.
745
746 * AT Command:
747
748 (% class="box infomessage" %)
749 (((
750 **AT+TDC=N **
751 )))
752
753 **Example: **AT+TDC=30000. Means set interval to 30 seconds
754
755 * Downlink Payload (prefix 0x01):
756
757 (% class="box infomessage" %)
758 (((
759 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
760 )))
761
762
763 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
764
765 Set work mode.
766
767 * AT Command:
768
769 (% class="box infomessage" %)
770 (((
771 **AT+MOD=N  **
772 )))
773
774 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
775
776 * Downlink Payload (prefix 0x0A):
777
778 (% class="box infomessage" %)
779 (((
780 **0x0A aa     ~/~/ Same as AT+MOD=aa**
781 )))
782
783
784 ==== 3.4.2.3 Poll an uplink ====
785
786 * AT Command:
787
788 There is no AT Command to poll uplink
789
790 * Downlink Payload (prefix 0x08):
791
792 (% class="box infomessage" %)
793 (((
794 **0x08 FF     ~/~/ Poll an uplink,**
795 )))
796
797 **Example**: 0x08FF, ask device to send an Uplink
798
799
800 ==== 3.4.2.4 Enable Trigger Mode ====
801
802 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
803
804 * AT Command:
805
806 (% class="box infomessage" %)
807 (((
808 **AT+ADDMOD6=1 or 0**
809 )))
810
811 1: Enable Trigger Mode
812
813 0: Disable Trigger Mode
814
815 * Downlink Payload (prefix 0x0A 06):
816
817 (% class="box infomessage" %)
818 (((
819 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
820 )))
821
822
823 ==== 3.4.2.5 Poll trigger settings ====
824
825 Poll trigger settings,
826
827 * AT Command:
828
829 There is no AT Command for this feature.
830
831 * Downlink Payload (prefix 0x AB 06):
832
833 (% class="box infomessage" %)
834 (((
835 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
836 )))
837
838
839 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
840
841 Enable Disable DI1/DI2/DI2 as trigger,
842
843 * AT Command:
844
845 (% class="box infomessage" %)
846 (((
847 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
848 )))
849
850 **Example:**
851
852 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
853
854 * Downlink Payload (prefix 0xAA 02):
855
856 (% class="box infomessage" %)
857 (((
858 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
859 )))
860
861
862 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
863
864 Set DI1 or DI3(for LT-33222-L) trigger.
865
866 * AT Command:
867
868 (% class="box infomessage" %)
869 (((
870 **AT+TRIG1=a,b**
871 )))
872
873 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
874
875 b : delay timing.
876
877 **Example:**
878
879 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
880
881 * Downlink Payload (prefix 0x09 01 ):
882
883 (% class="box infomessage" %)
884 (((
885 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
886 )))
887
888
889 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
890
891 Set DI2 trigger.
892
893 * AT Command:
894
895 (% class="box infomessage" %)
896 (((
897 **AT+TRIG2=a,b**
898 )))
899
900 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
901
902 b : delay timing.
903
904 **Example:**
905
906 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
907
908 * Downlink Payload (prefix 0x09 02 ):
909
910 (% class="box infomessage" %)
911 (((
912 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
913 )))
914
915
916 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
917
918 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
919
920 * AT Command:
921
922 (% class="box infomessage" %)
923 (((
924 **AT+ACLIM. **
925 )))
926
927 * Downlink Payload (prefix 0xAA 01 ):
928
929 (% class="box infomessage" %)
930 (((
931 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
932 )))
933
934
935 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
936
937 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
938
939 * AT Command:
940
941 (% class="box infomessage" %)
942 (((
943 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
944 )))
945
946 * Downlink Payload (prefix 0xAA 00 ):
947
948 (% class="box infomessage" %)
949 (((
950 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
951 )))
952
953
954 ==== 3.4.2.11 Trigger – Set minimum interval ====
955
956 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
957
958 * AT Command:
959
960 (% class="box infomessage" %)
961 (((
962 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
963 )))
964
965 * Downlink Payload (prefix 0xAC ):
966
967 (% class="box infomessage" %)
968 (((
969 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
970 )))
971
972
973 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
974
975 * AT Command:
976
977 There is no AT Command to control Digital Output
978
979 * Downlink Payload (prefix 0x02):
980
981 (% class="box infomessage" %)
982 (((
983 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
984 )))
985
986 (((
987 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
988 )))
989
990 (((
991 01: Low,  00: High ,  11: No action
992 )))
993
994 [[image:image-20220524092754-5.png]]
995
996 (((
997 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
998 )))
999
1000 (((
1001 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1002 )))
1003
1004
1005 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1006
1007 * AT Command:
1008
1009 There is no AT Command to control Digital Output
1010
1011 * Downlink Payload (prefix 0xA9):
1012
1013 (% class="box infomessage" %)
1014 (((
1015 (((
1016 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1017 )))
1018 )))
1019
1020 This is to control the digital output time of DO pin. Include four bytes:
1021
1022 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1023
1024 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1025
1026 01: DO pins will change back to original state after timeout.
1027
1028 00: DO pins will change to an inverter state after timeout 
1029
1030 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1031
1032 [[image:image-20220524093238-6.png]]
1033
1034 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1035
1036 [[image:image-20220524093328-7.png]]
1037
1038 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1039
1040 [[image:image-20220524093351-8.png]]
1041
1042 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1043
1044 Latching time. Unit: ms
1045
1046 Device will upload a packet if downlink code executes successfully.
1047
1048 **Example payload:**
1049
1050 **~1. A9 01 01 01 01 07 D0**
1051
1052 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1053
1054 **2. A9 01 00 01 11 07 D0**
1055
1056 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1057
1058 **3. A9 00 00 00 00 07 D0**
1059
1060 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1061
1062 **4. A9 00 11 01 00 07 D0**
1063
1064 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
1065
1066
1067 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1068
1069 * AT Command:
1070
1071 There is no AT Command to control Relay Output
1072
1073 * Downlink Payload (prefix 0x03):
1074
1075 (% class="box infomessage" %)
1076 (((
1077 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1078 )))
1079
1080 (((
1081 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1082 )))
1083
1084 (((
1085 01: Close ,  00: Open , 11: No action
1086 )))
1087
1088 (((
1089 [[image:image-20220524093724-9.png]]
1090 )))
1091
1092 Device will upload a packet if downlink code executes successfully.
1093
1094
1095 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1096
1097 * AT Command:
1098
1099 There is no AT Command to control Relay Output
1100
1101 * Downlink Payload (prefix 0x05):
1102
1103 (% class="box infomessage" %)
1104 (((
1105 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1106 )))
1107
1108 This is to control the relay output time of relay. Include four bytes:
1109
1110 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1111
1112 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1113
1114 01: Relays will change back to original state after timeout.
1115
1116 00: Relays will change to an inverter state after timeout
1117
1118 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1119
1120 [[image:image-20220524093831-10.png]]
1121
1122 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1123
1124 Device will upload a packet if downlink code executes successfully.
1125
1126 **Example payload:**
1127
1128 **~1. 05 01 11 07 D0**
1129
1130 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1131
1132 **2. 05 01 10 07 D0**
1133
1134 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1135
1136 **3. 05 00 01 07 D0**
1137
1138 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1139
1140 **4. 05 00 00 07 D0**
1141
1142 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1143
1144
1145 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1146
1147 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1148
1149 * AT Command:
1150
1151 (% class="box infomessage" %)
1152 (((
1153 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1154 )))
1155
1156 * Downlink Payload (prefix 0xA5):
1157
1158 (% class="box infomessage" %)
1159 (((
1160 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1161 )))
1162
1163
1164 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1165
1166 * AT Command:
1167
1168 (% class="box infomessage" %)
1169 (((
1170 **AT+SETCNT=aa,(bb cc dd ee) **
1171 )))
1172
1173 aa: 1: Set count1,
1174
1175 2: Set count2,
1176
1177 3: Set AV1 count
1178
1179 Bb cc dd ee: number to be set
1180
1181 * Downlink Payload (prefix 0xA8):
1182
1183 (% class="box infomessage" %)
1184 (((
1185 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1186 )))
1187
1188
1189 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1190
1191 Clear counting for counting mode
1192
1193 * AT Command:
1194
1195 (% class="box infomessage" %)
1196 (((
1197 **AT+CLRCOUNT ~/~/ clear all counting**
1198 )))
1199
1200 * Downlink Payload (prefix 0xA6):
1201
1202 (% class="box infomessage" %)
1203 (((
1204 **0x A6 01     ~/~/ clear all counting,**
1205 )))
1206
1207
1208 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1209
1210 * AT Command:
1211
1212 (% class="box infomessage" %)
1213 (((
1214 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1215 )))
1216
1217 * Downlink Payload (prefix 0xA7):
1218
1219 (% class="box infomessage" %)
1220 (((
1221 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1222 )))
1223
1224 (((
1225 range: aa bb cc:0 to 16777215,  (unit:second)
1226
1227
1228 )))
1229
1230 == 3.5 Integrate with Mydevice ==
1231
1232 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:
1233
1234 (((
1235 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1236 )))
1237
1238 (((
1239 **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:
1240 )))
1241
1242 [[image:1653356737703-362.png||height="232" width="732"]]
1243
1244 [[image:image-20220524094641-11.png||height="390" width="723"]]
1245
1246 [[image:image-20220524094641-12.png||height="402" width="718"]]
1247
1248
1249 **Step 3**: Create an account or log in Mydevices.
1250
1251 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1252
1253 Search under The things network
1254
1255 [[image:1653356838789-523.png||height="337" width="740"]]
1256
1257
1258 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1259
1260 [[image:image-20220524094909-1.png||height="335" width="729"]]
1261
1262 [[image:image-20220524094909-2.png||height="337" width="729"]]
1263
1264 [[image:image-20220524094909-3.png||height="338" width="727"]]
1265
1266 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1267
1268 [[image:image-20220524094909-5.png||height="341" width="734"]]
1269
1270
1271 == 3.6 Interface Detail ==
1272
1273 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1274
1275 Support NPN Type sensor
1276
1277 [[image:1653356991268-289.png]]
1278
1279
1280 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1281
1282 (((
1283 The DI port of LT-22222-L can support NPN or PNP output sensor.
1284 )))
1285
1286 (((
1287 (((
1288 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
1289 )))
1290 )))
1291
1292 [[image:1653357170703-587.png]]
1293
1294 (((
1295 (((
1296 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1297 )))
1298 )))
1299
1300 (((
1301
1302 )))
1303
1304 (((
1305 **Example1**: Connect to a Low active sensor.
1306 )))
1307
1308 (((
1309 This type of sensor will output a low signal GND when active.
1310 )))
1311
1312 * (((
1313 Connect sensor’s output to DI1-
1314 )))
1315 * (((
1316 Connect sensor’s VCC to DI1+.
1317 )))
1318
1319 (((
1320 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1321 )))
1322
1323 (((
1324 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1325 )))
1326
1327 (((
1328 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.
1329 )))
1330
1331 (((
1332
1333 )))
1334
1335 (((
1336 **Example2**: Connect to a High active sensor.
1337 )))
1338
1339 (((
1340 This type of sensor will output a high signal (example 24v) when active.
1341 )))
1342
1343 * (((
1344 Connect sensor’s output to DI1+
1345 )))
1346 * (((
1347 Connect sensor’s GND DI1-.
1348 )))
1349
1350 (((
1351 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1352 )))
1353
1354 (((
1355 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1356 )))
1357
1358 (((
1359 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.
1360 )))
1361
1362 (((
1363
1364 )))
1365
1366 (((
1367 **Example3**: Connect to a 220v high active sensor.
1368 )))
1369
1370 (((
1371 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1372 )))
1373
1374 * (((
1375 Connect sensor’s output to DI1+ with a serial 50K resistor
1376 )))
1377 * (((
1378 Connect sensor’s GND DI1-.
1379 )))
1380
1381 (((
1382 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1383 )))
1384
1385 (((
1386 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1387 )))
1388
1389 (((
1390 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.
1391 )))
1392
1393
1394 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1395
1396 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1397
1398 [[image:1653357531600-905.png]]
1399
1400
1401 === 3.6.4 Analog Input Interface ===
1402
1403 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:
1404
1405 **AC2 = (IN2 voltage )/12**
1406
1407 [[image:1653357592296-182.png]]
1408
1409 Example to connect a 4~~20mA sensor
1410
1411 We take the wind speed sensor as an example for reference only.
1412
1413 Specifications of the wind speed sensor:
1414
1415 Red:12~~24v
1416
1417 Yellow:4~~20mA
1418
1419 Black:GND
1420
1421
1422 Connection diagram:
1423
1424 [[image:1653357640609-758.png]]
1425
1426 [[image:1653357648330-671.png||height="155" width="733"]]
1427
1428
1429 === 3.6.5 Relay Output ===
1430
1431 (((
1432 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:
1433 )))
1434
1435 [[image:image-20220524100215-9.png]]
1436
1437 [[image:image-20220524100215-10.png||height="382" width="723"]]
1438
1439
1440 == 3.7 LEDs Indicators ==
1441
1442 [[image:image-20220524100748-11.png]]
1443
1444
1445 = 4. Use AT Command =
1446
1447 == 4.1 Access AT Command ==
1448
1449 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.
1450
1451 [[image:1653358238933-385.png]]
1452
1453 (((
1454 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:
1455 )))
1456
1457 [[image:1653358355238-883.png]]
1458
1459 (((
1460 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/]]
1461 )))
1462
1463 (((
1464 AT+<CMD>?        : Help on <CMD>
1465 )))
1466
1467 (((
1468 AT+<CMD>         : Run <CMD>
1469 )))
1470
1471 (((
1472 AT+<CMD>=<value> : Set the value
1473 )))
1474
1475 (((
1476 AT+<CMD>=?       : Get the value
1477 )))
1478
1479 (((
1480 ATZ: Trig a reset of the MCU
1481 )))
1482
1483 (((
1484 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1485 )))
1486
1487 (((
1488 AT+DEUI: Get or Set the Device EUI
1489 )))
1490
1491 (((
1492 AT+DADDR: Get or Set the Device Address
1493 )))
1494
1495 (((
1496 AT+APPKEY: Get or Set the Application Key
1497 )))
1498
1499 (((
1500 AT+NWKSKEY: Get or Set the Network Session Key
1501 )))
1502
1503 (((
1504 AT+APPSKEY: Get or Set the Application Session Key
1505 )))
1506
1507 (((
1508 AT+APPEUI: Get or Set the Application EUI
1509 )))
1510
1511 (((
1512 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1513 )))
1514
1515 (((
1516 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1517 )))
1518
1519 (((
1520 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1521 )))
1522
1523 (((
1524 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1525 )))
1526
1527 (((
1528 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1529 )))
1530
1531 (((
1532 AT+RX2FQ: Get or Set the Rx2 window frequency
1533 )))
1534
1535 (((
1536 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1537 )))
1538
1539 (((
1540 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1541 )))
1542
1543 (((
1544 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1545 )))
1546
1547 (((
1548 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1549 )))
1550
1551 (((
1552 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1553 )))
1554
1555 (((
1556 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1557 )))
1558
1559 (((
1560 AT+NWKID: Get or Set the Network ID
1561 )))
1562
1563 (((
1564 AT+FCU: Get or Set the Frame Counter Uplink
1565 )))
1566
1567 (((
1568 AT+FCD: Get or Set the Frame Counter Downlink
1569 )))
1570
1571 (((
1572 AT+CLASS: Get or Set the Device Class
1573 )))
1574
1575 (((
1576 AT+JOIN: Join network
1577 )))
1578
1579 (((
1580 AT+NJS: Get OTAA Join Status
1581 )))
1582
1583 (((
1584 AT+SENDB: Send hexadecimal data along with the application port
1585 )))
1586
1587 (((
1588 AT+SEND: Send text data along with the application port
1589 )))
1590
1591 (((
1592 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1593 )))
1594
1595 (((
1596 AT+RECV: Print last received data in raw format
1597 )))
1598
1599 (((
1600 AT+VER: Get current image version and Frequency Band
1601 )))
1602
1603 (((
1604 AT+CFM: Get or Set the confirmation mode (0-1)
1605 )))
1606
1607 (((
1608 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1609 )))
1610
1611 (((
1612 AT+SNR: Get the SNR of the last received packet
1613 )))
1614
1615 (((
1616 AT+RSSI: Get the RSSI of the last received packet
1617 )))
1618
1619 (((
1620 AT+TDC: Get or set the application data transmission interval in ms
1621 )))
1622
1623 (((
1624 AT+PORT: Get or set the application port
1625 )))
1626
1627 (((
1628 AT+DISAT: Disable AT commands
1629 )))
1630
1631 (((
1632 AT+PWORD: Set password, max 9 digits
1633 )))
1634
1635 (((
1636 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1637 )))
1638
1639 (((
1640 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1641 )))
1642
1643 (((
1644 AT+CFG: Print all settings
1645
1646
1647 )))
1648
1649 == 4.2 Common AT Command Sequence ==
1650
1651 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1652
1653 (((
1654 If device has not joined network yet:
1655 )))
1656
1657 (((
1658 (% style="background-color:#dcdcdc" %)123456
1659 )))
1660
1661 (((
1662 (% style="background-color:#dcdcdc" %)AT+FDR
1663 )))
1664
1665 (((
1666 (% style="background-color:#dcdcdc" %)123456
1667 )))
1668
1669 (((
1670 (% style="background-color:#dcdcdc" %)AT+NJM=0
1671 )))
1672
1673 (((
1674 (% style="background-color:#dcdcdc" %)ATZ
1675 )))
1676
1677
1678 (((
1679 If device already joined network:
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 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1693
1694 (((
1695 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1696 )))
1697
1698 (((
1699 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1700 )))
1701
1702 (((
1703 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1704 )))
1705
1706 (((
1707 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1708 )))
1709
1710 (((
1711 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1712 )))
1713
1714 (((
1715 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1716 )))
1717
1718 (((
1719 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1720 )))
1721
1722 (((
1723 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1724 )))
1725
1726 (((
1727 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1728 )))
1729
1730 (((
1731 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1732 )))
1733
1734 (((
1735 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1736 )))
1737
1738 (((
1739 (% 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.
1740 )))
1741
1742 (((
1743 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1744 )))
1745
1746 (((
1747 (% style="color:red" %)**Note:**
1748 )))
1749
1750 (((
1751 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1752 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1753 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.
1754 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
1755 )))
1756
1757 (((
1758 [[image:1653359097980-169.png||height="188" width="729"]]
1759 )))
1760
1761 (((
1762
1763 )))
1764
1765 === 4.2.3 Change to Class A ===
1766
1767 If sensor JOINED
1768 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1769 ATZ
1770
1771
1772 = 5. FAQ =
1773
1774 == 5.1 How to upgrade the image? ==
1775
1776 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1777
1778 * Support new features
1779 * For bug fix
1780 * Change LoRaWAN bands.
1781 Below shows the hardware connection for how to upload an image to the LT:
1782 * [[image:1653359603330-121.png]]
1783
1784 (((
1785 **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]].
1786 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1787 **Step3: **Open flashloader; choose the correct COM port to update.
1788 **For LT-22222-L**:
1789 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.
1790 )))
1791
1792 [[image:image-20220524103407-12.png]]
1793
1794 [[image:image-20220524103429-13.png]]
1795
1796 [[image:image-20220524104033-15.png]]
1797
1798 (% 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:
1799
1800 [[image:1653360054704-518.png||height="186" width="745"]]
1801
1802
1803 (((
1804 (((
1805 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1806 )))
1807 )))
1808
1809 (((
1810 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1811
1812
1813 )))
1814
1815 (((
1816 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1817 )))
1818
1819 (((
1820 (((
1821 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1822 )))
1823 )))
1824
1825 (((
1826 (((
1827 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1828 )))
1829 )))
1830
1831 (((
1832 (% 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.
1833 )))
1834
1835 (((
1836 [[image:1653360231087-571.png||height="401" width="727"]]
1837 )))
1838
1839 (((
1840 (% 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.
1841 )))
1842
1843 (((
1844 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1845 )))
1846
1847 (((
1848 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1849 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1850 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1851 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1852 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1853 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1854 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1855 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1856 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1857 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1858 )))
1859
1860 (((
1861 As shown in below:
1862 )))
1863
1864 [[image:1653360498588-932.png||height="485" width="726"]]
1865
1866
1867 == 5.4 Can I see counting event in Serial? ==
1868
1869 (((
1870 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.
1871
1872
1873 == 5.5 Can i use point to point communication for LT-22222-L? ==
1874
1875 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1876
1877
1878 )))
1879
1880 (((
1881 = 6. Trouble Shooting =
1882 )))
1883
1884 (((
1885 (((
1886 == 6.1 Downlink doesn’t work, how to solve it? ==
1887 )))
1888 )))
1889
1890 (((
1891 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1892
1893
1894 )))
1895
1896 (((
1897 == 6.2 Have trouble to upload image. ==
1898 )))
1899
1900 (((
1901 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1902 )))
1903
1904 (((
1905
1906 )))
1907
1908 (((
1909 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1910 )))
1911
1912 (((
1913 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1914 )))
1915
1916 (((
1917
1918 )))
1919
1920 (((
1921 = 7. Order Info =
1922 )))
1923
1924 (((
1925 (((
1926 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1927 )))
1928 )))
1929
1930 (((
1931 (((
1932 (% style="color:#4f81bd" %)**XXX:**
1933 )))
1934 )))
1935
1936 (((
1937 * (((
1938 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1939 )))
1940 )))
1941
1942 (((
1943 * (((
1944 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1945 )))
1946 )))
1947
1948 (((
1949 * (((
1950 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1951 )))
1952 )))
1953
1954 (((
1955 * (((
1956 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1957 )))
1958 )))
1959
1960 (((
1961 * (((
1962 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1963 )))
1964 )))
1965
1966 (((
1967 * (((
1968 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1969 )))
1970 )))
1971
1972 (((
1973 * (((
1974 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1975 )))
1976 )))
1977
1978 (((
1979 * (((
1980 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1981 )))
1982 )))
1983
1984 (((
1985 * (((
1986 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1987
1988
1989 )))
1990
1991 = 8. Packing Info =
1992 )))
1993
1994 (((
1995 (((
1996 **Package Includes**:
1997 )))
1998 )))
1999
2000 (((
2001 (((
2002 * LT-22222-L I/O Controller x 1
2003 * Stick Antenna for LoRa RF part x 1
2004 * Bracket for controller x1
2005 * Program cable x 1
2006 )))
2007 )))
2008
2009 (((
2010 (((
2011 **Dimension and weight**:
2012 )))
2013 )))
2014
2015 (((
2016 (((
2017 * Device Size: 13.5 x 7 x 3 cm
2018 * Device Weight: 105g
2019 * Package Size / pcs : 14.5 x 8 x 5 cm
2020 * Weight / pcs : 170g
2021
2022
2023 )))
2024 )))
2025
2026 (((
2027 = 9. Support =
2028 )))
2029
2030 * (((
2031 (((
2032 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.
2033 )))
2034 )))
2035 * (((
2036 (((
2037 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
2038 )))
2039 )))
2040
2041 (((
2042 (((
2043 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2044
2045
2046 )))
2047
2048 (((
2049 = 10. Reference​​​​​ =
2050
2051 * Product Page:
2052
2053 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]]
2054
2055 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2056 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2057 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2058 )))
2059 )))
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