Version 83.1 by Bei Jinggeng on 2022/06/28 13:36
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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
23
24 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.
25 )))
26
27 (((
28 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.
29 )))
30
31 (((
32 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
33 )))
34
35 (((
36 The use environment includes:
37 )))
38
39 (((
40 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.
41 )))
42
43 (((
44 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
45 )))
46
47 (((
48 [[image:1653295757274-912.png]]
49
50
51 )))
52
53
54 == 1.2  Specifications ==
55
56 (((
57
58
59 **Hardware System:**
60 )))
61
62 * (((
63 STM32L072CZT6 MCU
64 )))
65 * (((
66 SX1276/78 Wireless Chip 
67 )))
68 * (((
69 (((
70 Power Consumption:
71 )))
72
73 * (((
74 Idle: 4mA@12v
75 )))
76 * (((
77 20dB Transmit: 34mA@12v
78 )))
79 )))
80
81 (((
82
83
84 **Interface for Model: LT22222-L:**
85 )))
86
87 * (((
88 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
89 )))
90 * (((
91 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
92 )))
93 * (((
94 2 x Relay Output (5A@250VAC / 30VDC)
95 )))
96 * (((
97 2 x 0~~20mA Analog Input (res:0.01mA)
98 )))
99 * (((
100 2 x 0~~30V Analog Input (res:0.01v)
101 )))
102 * (((
103 Power Input 7~~ 24V DC. 
104 )))
105
106 (((
107
108
109 **LoRa Spec:**
110 )))
111
112 * (((
113 (((
114 Frequency Range:
115 )))
116
117 * (((
118 Band 1 (HF): 862 ~~ 1020 Mhz
119 )))
120 * (((
121 Band 2 (LF): 410 ~~ 528 Mhz
122 )))
123 )))
124 * (((
125 168 dB maximum link budget.
126 )))
127 * (((
128 +20 dBm - 100 mW constant RF output vs.
129 )))
130 * (((
131 +14 dBm high efficiency PA.
132 )))
133 * (((
134 Programmable bit rate up to 300 kbps.
135 )))
136 * (((
137 High sensitivity: down to -148 dBm.
138 )))
139 * (((
140 Bullet-proof front end: IIP3 = -12.5 dBm.
141 )))
142 * (((
143 Excellent blocking immunity.
144 )))
145 * (((
146 Low RX current of 10.3 mA, 200 nA register retention.
147 )))
148 * (((
149 Fully integrated synthesizer with a resolution of 61 Hz.
150 )))
151 * (((
152 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
153 )))
154 * (((
155 Built-in bit synchronizer for clock recovery.
156 )))
157 * (((
158 Preamble detection.
159 )))
160 * (((
161 127 dB Dynamic Range RSSI.
162 )))
163 * (((
164 Automatic RF Sense and CAD with ultra-fast AFC.
165 )))
166 * (((
167 Packet engine up to 256 bytes with CRC.
168
169
170
171
172 )))
173
174 == 1.3 Features ==
175
176 * LoRaWAN Class A & Class C protocol
177 * Optional Customized LoRa Protocol
178 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
179 * AT Commands to change parameters
180 * Remote configure parameters via LoRa Downlink
181 * Firmware upgradable via program port
182 * Counting
183
184
185 == 1.4  Applications ==
186
187 * Smart Buildings & Home Automation
188 * Logistics and Supply Chain Management
189 * Smart Metering
190 * Smart Agriculture
191 * Smart Cities
192 * Smart Factory
193
194
195 == 1.5 Hardware Variants ==
196
197 (% border="1" style="background-color:#f7faff; width:500px" %)
198 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
199 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
200 * 2 x Digital Input (Bi-direction)
201 * 2 x Digital Output
202 * 2 x Relay Output (5A@250VAC / 30VDC)
203 * 2 x 0~~20mA Analog Input (res:0.01mA)
204 * 2 x 0~~30V Analog Input (res:0.01v)
205 * 1 x Counting Port
206 )))
207
208 = 2. Power ON Device =
209
210 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.
211
212 (((
213 PWR will on when device is properly powered.
214 )))
215
216 [[image:1653297104069-180.png]]
217
218
219
220 = 3. Operation Mode =
221
222 == 3.1 How it works? ==
223
224 (((
225 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. 
226 )))
227
228 (((
229 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.
230 )))
231
232
233 == 3.2 Example to join LoRaWAN network ==
234
235 (((
236 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. 
237 )))
238
239 [[image:image-20220523172350-1.png||height="266" width="864"]]
240
241
242 (((
243 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:
244 )))
245
246 (((
247 (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LT IO controller.
248 )))
249
250 (((
251 Each LT is shipped with a sticker with the default device EUI as below:
252 )))
253
254 [[image:1653297924498-393.png]]
255
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 (% style="color:blue" %)**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
298
299 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
300 )))
301
302 [[image:image-20220523174254-4.png]]
303
304 * RO is for relay. ROx=1 : close，ROx=0 always open.
305 * DI is for digital input. DIx=1: high or float, DIx=0: low.
306 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
307
308 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
309
310 For example if payload is: [[image:image-20220523175847-2.png]]
311
312
313 **The value for the interface is:  **
314
315 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
316
317 AVI2 channel voltage is 0x04AC/1000=1.196V
318
319 ACI1 channel current is 0x1310/1000=4.880mA
320
321 ACI2 channel current is 0x1300/1000=4.864mA
322
323 The last byte 0xAA= 10101010(B) means
324
325 * [1] RO1 relay channel is close and the RO1 LED is ON.
326 * [0] RO2 relay channel is open and RO2 LED is OFF;
327
328 **LT22222-L:**
329
330 * [1] DI2 channel is high input and DI2 LED is ON;
331 * [0] DI1 channel is low input;
332
333 * [0] DO3 channel output state
334 ** DO3 is float in case no load between DO3 and V+.;
335 ** DO3 is high in case there is load between DO3 and V+.
336 ** DO3 LED is off in both case
337 * [1] DO2 channel output is low and DO2 LED is ON.
338 * [0] DO1 channel output state
339 ** DO1 is float in case no load between DO1 and V+.;
340 ** DO1 is high in case there is load between DO1 and V+.
341 ** DO1 LED is off in both case
342
343
344
345 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
346
347
348 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
349
350 (((
351 Total : 11 bytes payload
352 )))
353
354 [[image:image-20220523180452-3.png]]
355
356
357 (((
358 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
359 )))
360
361 [[image:image-20220523180506-4.png]]
362
363 * RO is for relay. ROx=1 : close，ROx=0 always open.
364 * FIRST: Indicate this is the first packet after join network.
365 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
366
367 (((
368 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
369 )))
370
371 (((
372
373
374 **To use counting mode, please run:**
375 )))
376
377 (% class="box infomessage" %)
378 (((
379 (((
380 **AT+MOD=2**
381
382 **ATZ**
383 )))
384 )))
385
386 (((
387
388
389 (% style="color:#4f81bd" %)**AT Commands for counting:**
390 )))
391
392 (((
393 **For LT22222-L:**
394
395
396 (% style="color:blue" %)**AT+TRIG1=0,100**(%%)**  (set DI1 port to trigger on low level, valid signal is 100ms) **
397
398 (% style="color:blue" %)**AT+TRIG1=1,100**(%%)**  (set DI1 port to trigger on high level, valid signal is 100ms ) **
399
400 (% style="color:blue" %)**AT+TRIG2=0,100**(%%)**  (set DI2 port to trigger on low level, valid signal is 100ms) **
401
402 (% style="color:blue" %)**AT+TRIG2=1,100**(%%)**  (set DI2 port to trigger on high level, valid signal is 100ms ) **
403
404 (% style="color:blue" %)**AT+SETCNT=1,60**(%%)**   (Set COUNT1 value to 60)**
405
406 (% style="color:blue" %)**AT+SETCNT=2,60**(%%)**   (Set COUNT2 value to 60)**
407 )))
408
409
410
411 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
412
413 **LT22222-L**: This mode the DI1 is used as a counting pin.
414
415 [[image:image-20220523181246-5.png]]
416
417 (((
418 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
419 )))
420
421 [[image:image-20220523181301-6.png]]
422
423 * RO is for relay. ROx=1 : close，ROx=0 always open.
424 * FIRST: Indicate this is the first packet after join network.
425 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
426
427 (((
428 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
429 )))
430
431 (((
432 **To use counting mode, please run:**
433 )))
434
435 (% class="box infomessage" %)
436 (((
437 (((
438 **AT+MOD=3**
439
440 **ATZ**
441 )))
442 )))
443
444 (((
445 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
446 )))
447
448
449
450 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
451
452
453 **LT22222-L**: This mode the DI1 is used as a counting pin.
454
455 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.
456
457 [[image:image-20220523181903-8.png]]
458
459
460 (((
461 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
462 )))
463
464 [[image:image-20220523181727-7.png]]
465
466 * RO is for relay. ROx=1 : close，ROx=0 always open.
467 * FIRST: Indicate this is the first packet after join network.
468 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
469
470 (((
471 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
472 )))
473
474 (((
475
476
477 **To use this mode, please run:**
478 )))
479
480 (% class="box infomessage" %)
481 (((
482 (((
483 **AT+MOD=4**
484
485 **ATZ**
486 )))
487 )))
488
489
490
491 (((
492 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
493 )))
494
495 (((
496
497
498 **Plus below command for AVI1 Counting:**
499
500
501 (% style="color:blue" %)**AT+SETCNT=3,60**(%%)**  (set AVI Count to 60)**
502
503 (% style="color:blue" %)**AT+VOLMAX=20000**(%%)**  (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
504
505 (% style="color:blue" %)**AT+VOLMAX=20000,0**(%%)**  (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
506
507 (% style="color:blue" %)**AT+VOLMAX=20000,1**(%%)**  (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
508 )))
509
510
511
512 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
513
514
515 **LT22222-L**: This mode the DI1 is used as a counting pin.
516
517 [[image:image-20220523182334-9.png]]
518
519 (((
520
521
522 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
523 )))
524
525 * RO is for relay. ROx=1 : close，ROx=0 always open.
526 * FIRST: Indicate this is the first packet after join network.
527 * (((
528 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
529 )))
530
531 (((
532 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
533 )))
534
535 (((
536
537
538 **To use this mode, please run:**
539 )))
540
541 (% class="box infomessage" %)
542 (((
543 (((
544 **AT+MOD=5**
545
546 **ATZ**
547 )))
548 )))
549
550 (((
551 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
552 )))
553
554
555
556 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
557
558
559 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
560
561 For example, if user has configured below commands:
562
563 * **AT+MOD=1 ** **~-~->** The normal working mode
564 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
565
566 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
567
568 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
569 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.**
570
571 (% style="color:#037691" %)**AT Command to set Trigger Condition**:
572
573 (% style="color:#4f81bd" %)**Trigger base on voltage**:
574
575 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
576
577 **Example:**
578
579 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)
580
581 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
582
583
584
585 (% style="color:#4f81bd" %)**Trigger base on current**:
586
587 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
588
589 **Example:**
590
591 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
592
593
594
595 (% style="color:#4f81bd" %)**Trigger base on DI status**:
596
597 DI status trigger Flag.
598
599 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
600
601
602 **Example:**
603
604 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
605
606
607 (% style="color:#037691" %)**Downlink Command to set Trigger Condition:**
608
609 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
610
611 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
612
613 AA: Code for this downlink Command:
614
615 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
616
617 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
618
619 yy2 yy2: AC1 or AV1 high limit.
620
621 yy3 yy3: AC2 or AV2 low limit.
622
623 Yy4 yy4: AC2 or AV2 high limit.
624
625
626 **Example1**: AA 00 13 88 00 00 00 00 00 00
627
628 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
629
630
631 **Example2**: AA 02 01 00
632
633 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
634
635
636
637 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
638
639 MOD6 Payload : total 11 bytes payload
640
641 [[image:image-20220524085923-1.png]]
642
643
644 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
645
646 [[image:image-20220524090106-2.png]]
647
648 * Each bits shows if the corresponding trigger has been configured.
649
650 **Example:**
651
652 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
653
654
655 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
656
657 [[image:image-20220524090249-3.png]]
658
659 * Each bits shows which status has been trigger on this uplink.
660
661 **Example:**
662
663 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
664
665
666 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
667
668 [[image:image-20220524090456-4.png]]
669
670 * Each bits shows which status has been trigger on this uplink.
671
672 **Example:**
673
674 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
675
676 00000101: Means both DI1 and DI2 trigger are enabled.
677
678
679 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
680
681 Downlink command to poll MOD6 status:
682
683 **AB 06**
684
685 When device got this command, it will send the MOD6 payload.
686
687
688
689 === 3.3.7 Payload Decoder ===
690
691 (((
692
693
694 **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/]]
695
696
697 )))
698
699
700 == 3.4 ​Configure LT via AT or Downlink ==
701
702 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
703
704 (((
705 There are two kinds of Commands:
706 )))
707
708 * (% 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]]
709
710 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
711
712
713
714 === 3.4.1 Common Commands ===
715
716 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]]
717
718
719
720 === 3.4.2 Sensor related commands ===
721
722 ==== 3.4.2.1 Set Transmit Interval ====
723
724 Set device uplink interval.
725
726 * (% style="color:#037691" %)**AT Command:**
727
728 **AT+TDC=N **
729
730
731 **Example: **AT+TDC=30000. Means set interval to 30 seconds
732
733
734 * (% style="color:#037691" %)**Downlink Payload (prefix 0x01):**
735
736 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
737
738
739
740
741 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
742
743 Set work mode.
744
745 * (% style="color:#037691" %)**AT Command:**
746
747 **AT+MOD=N  **
748
749
750 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
751
752
753 * (% style="color:#037691" %)**Downlink Payload (prefix 0x0A):**
754
755 **0x0A aa    ** ~/~/ Same as AT+MOD=aa
756
757
758
759
760 ==== 3.4.2.3 Poll an uplink ====
761
762 * (% style="color:#037691" %)**AT Command:**
763
764 There is no AT Command to poll uplink
765
766
767 * (% style="color:#037691" %)**Downlink Payload (prefix 0x08):**
768
769 **0x08 FF     **~/~/ Poll an uplink
770
771 **Example**: 0x08FF, ask device to send an Uplink
772
773
774
775 ==== 3.4.2.4 Enable Trigger Mode ====
776
777 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
778
779 * (% style="color:#037691" %)**AT Command:**
780
781 **AT+ADDMOD6=1 or 0**
782
783 1: Enable Trigger Mode
784
785 0: Disable Trigger Mode
786
787
788 * (% style="color:#037691" %)**Downlink Payload (prefix 0x0A 06):**
789
790 **0x0A 06 aa    ** ~/~/ Same as AT+ADDMOD6=aa
791
792
793
794
795 ==== 3.4.2.5 Poll trigger settings ====
796
797 Poll trigger settings,
798
799 * (% style="color:#037691" %)**AT Command:**
800
801 There is no AT Command for this feature.
802
803
804 * (% style="color:#037691" %)**Downlink Payload (prefix 0x AB 06):**
805
806 **0xAB 06         **~/~/ Poll trigger settings, device will uplink trigger settings once receive this command
807
808
809
810
811 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
812
813 Enable Disable DI1/DI2/DI2 as trigger,
814
815 * (% style="color:#037691" %)**AT Command:**
816
817 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
818
819
820 **Example:**
821
822 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
823
824 * (% style="color:#037691" %)**Downlink Payload (prefix 0xAA 02):**
825
826 **0xAA 02 aa bb        **~/~/ Same as AT+DTRI=aa,bb
827
828
829
830
831 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
832
833 Set DI1 or DI3(for LT-33222-L) trigger.
834
835 * (% style="color:#037691" %)**AT Command:**
836
837 **AT+TRIG1=a,b**
838
839 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
840
841 b : delay timing.
842
843
844 **Example:**
845
846 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
847
848
849 * (% style="color:#037691" %)**Downlink Payload (prefix 0x09 01 ):**
850 * **0x09 01 aa bb cc    ** ~/~/ same as AT+TRIG1=aa,0x(bb cc)
851
852 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
853
854 Set DI2 trigger.
855
856 * (% style="color:#037691" %)**AT Command:**
857
858 **AT+TRIG2=a,b**
859
860
861 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
862
863 b : delay timing.
864
865
866 **Example:**
867
868 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
869
870
871 * (% style="color:#037691" %)**Downlink Payload (prefix 0x09 02 ):**
872
873 **0x09 02 aa bb cc           **~/~/ same as AT+TRIG1=aa,0x(bb cc)
874
875
876
877
878 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
879
880 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
881
882 * (% style="color:#037691" %)**AT Command**
883
884 **AT+ACLIM**
885
886
887 * (% style="color:#037691" %)**Downlink Payload (prefix 0xAA 01 )**
888
889 **0x AA 01 aa bb cc dd ee ff gg hh        ** ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
890
891
892
893
894 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
895
896 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
897
898 * (% style="color:#037691" %)**AT Command**
899
900 **AT+AVLIM  See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
901
902
903 * (% style="color:#037691" %)**Downlink Payload (prefix 0xAA 00 )**
904
905 **0x AA 00 aa bb cc dd ee ff gg hh    ** ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
906
907
908
909
910 ==== 3.4.2.11 Trigger – Set minimum interval ====
911
912 Set AV and AC trigger minimum interval, system won't response to the second trigger within this set time after the first trigger.
913
914 * (% style="color:#037691" %)**AT Command**
915
916 **AT+ATDC=5        ** Device won't response the second trigger within 5 minute after the first trigger.
917
918
919 * (% style="color:#037691" %)**Downlink Payload (prefix 0xAC )**
920
921 **0x AC aa bb   ** ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)
922
923 (((
924
925
926 (% style="color:red" %)Note: ATDC setting must be more than 5min
927 )))
928
929
930
931 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
932
933 * (% style="color:#037691" %)**AT Command**
934
935 There is no AT Command to control Digital Output
936
937
938 * (% style="color:#037691" %)**Downlink Payload (prefix 0x02)**
939 * **0x02 aa bb cc     **~/~/ Set DO1/DO2/DO3 output
940
941 (((
942 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
943 )))
944
945 (((
946 01: Low,  00: High ,  11: No action
947 )))
948
949 [[image:image-20220524092754-5.png]]
950
951 (((
952 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
953 )))
954
955 (((
956 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
957 )))
958
959
960
961
962 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
963
964 * (% style="color:#037691" %)**AT Command**
965
966 There is no AT Command to control Digital Output
967
968
969 * (% style="color:#037691" %)**Downlink Payload (prefix 0xA9)**
970
971 **0xA9 aa bb cc     **~/~/ Set DO1/DO2/DO3 output with time control
972
973
974 This is to control the digital output time of DO pin. Include four bytes:
975
976 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
977
978 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
979
980 01: DO pins will change back to original state after timeout.
981
982 00: DO pins will change to an inverter state after timeout 
983
984
985 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
986
987 [[image:image-20220524093238-6.png]]
988
989
990 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
991
992 [[image:image-20220524093328-7.png]]
993
994
995 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
996
997 [[image:image-20220524093351-8.png]]
998
999
1000 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1001
1002 Latching time. Unit: ms
1003
1004 Device will upload a packet if downlink code executes successfully.
1005
1006
1007 **Example payload:**
1008
1009 **~1. A9 01 01 01 01 07 D0**
1010
1011 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1012
1013 **2. A9 01 00 01 11 07 D0**
1014
1015 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1016
1017 **3. A9 00 00 00 00 07 D0**
1018
1019 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1020
1021 **4. A9 00 11 01 00 07 D0**
1022
1023 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
1024
1025
1026
1027
1028 ==== 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ====
1029
1030 * (% style="color:#037691" %)**AT Command:**
1031
1032 There is no AT Command to control Relay Output
1033
1034
1035 * (% style="color:#037691" %)**Downlink Payload (prefix 0x03):**
1036
1037 **0x03 aa bb     **~/~/ Set RO1/RO2 output
1038
1039
1040 (((
1041 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1042 )))
1043
1044 (((
1045 01: Close ,  00: Open , 11: No action
1046 )))
1047
1048 (((
1049 [[image:image-20220524093724-9.png]]
1050 )))
1051
1052 Device will upload a packet if downlink code executes successfully.
1053
1054
1055
1056
1057 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1058
1059 * (% style="color:#037691" %)**AT Command:**
1060
1061 There is no AT Command to control Relay Output
1062
1063
1064 * (% style="color:#037691" %)**Downlink Payload (prefix 0x05):**
1065
1066 **0x05 aa bb cc dd     **~/~/ Set RO1/RO2 relay with time control
1067
1068
1069 This is to control the relay output time of relay. Include four bytes:
1070
1071 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1072
1073 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1074
1075 01: Relays will change back to original state after timeout.
1076
1077 00: Relays will change to an inverter state after timeout
1078
1079
1080 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1081
1082 [[image:image-20220524093831-10.png]]
1083
1084
1085 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1086
1087 Device will upload a packet if downlink code executes successfully.
1088
1089
1090 **Example payload:**
1091
1092 **~1. 05 01 11 07 D0**
1093
1094 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1095
1096 **2. 05 01 10 07 D0**
1097
1098 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1099
1100 **3. 05 00 01 07 D0**
1101
1102 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1103
1104 **4. 05 00 00 07 D0**
1105
1106 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1107
1108
1109
1110
1111 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1112
1113 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1114
1115 * (% style="color:#037691" %)**AT Command:**
1116
1117 **AT+VOLMAX   ** ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1118
1119
1120 * (% style="color:#037691" %)**Downlink Payload (prefix 0xA5):**
1121
1122 **0xA5 aa bb cc   **~/~/ Same as AT+VOLMAX=(aa bb),cc
1123
1124
1125
1126
1127 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1128
1129 * (% style="color:#037691" %)**AT Command:**
1130
1131 **AT+SETCNT=aa,(bb cc dd ee) **
1132
1133 aa: 1: Set count1,
1134
1135 2: Set count2,
1136
1137 3: Set AV1 count
1138
1139 Bb cc dd ee: number to be set
1140
1141
1142 * (% style="color:#037691" %)**Downlink Payload (prefix 0xA8):**
1143
1144 **0x A8 aa bb cc dd ee     **~/~/ same as AT+SETCNT=aa,(bb cc dd ee)
1145
1146
1147
1148
1149 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1150
1151 Clear counting for counting mode
1152
1153 * (% style="color:#037691" %)**AT Command:**
1154
1155 **AT+CLRCOUNT ** ~/~/ clear all counting
1156
1157
1158 * (% style="color:#037691" %)**Downlink Payload (prefix 0xA6):**
1159
1160 **0x A6 01    ** ~/~/ clear all counting
1161
1162
1163
1164
1165 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1166
1167 * (% style="color:#037691" %)**AT Command:**
1168
1169 **AT+COUTIME=60  **~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)
1170
1171
1172 * (% style="color:#037691" %)**Downlink Payload (prefix 0xA7):**
1173
1174 **0x A7 aa bb cc     **~/~/ same as AT+COUTIME =aa bb cc,
1175
1176 (((
1177 range: aa bb cc:0 to 16777215,  (unit:second)
1178
1179
1180 )))
1181
1182
1183
1184 == 3.5 Integrate with Mydevice ==
1185
1186 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:
1187
1188 (((
1189 (% style="color:blue" %)**Step 1**(%%): Be sure that your device is programmed and properly connected to the network at this time.
1190 )))
1191
1192 (((
1193 (% style="color:blue" %)**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:
1194 )))
1195
1196 [[image:1653356737703-362.png||height="232" width="732"]]
1197
1198 [[image:image-20220524094641-11.png||height="390" width="723"]]
1199
1200
1201 [[image:image-20220524094641-12.png||height="402" width="718"]]
1202
1203
1204 (% style="color:blue" %)**Step 3**(%%): Create an account or log in Mydevices.
1205
1206 (% style="color:blue" %)**Step 4**(%%): Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1207
1208 Search under The things network
1209
1210 [[image:1653356838789-523.png||height="337" width="740"]]
1211
1212
1213
1214 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1215
1216 [[image:image-20220524094909-1.png||height="335" width="729"]]
1217
1218
1219 [[image:image-20220524094909-2.png||height="337" width="729"]]
1220
1221
1222 [[image:image-20220524094909-3.png||height="338" width="727"]]
1223
1224
1225 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1226
1227
1228 [[image:image-20220524094909-5.png||height="341" width="734"]]
1229
1230
1231
1232 == 3.6 Interface Detail ==
1233
1234 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1235
1236 Support NPN Type sensor
1237
1238 [[image:1653356991268-289.png]]
1239
1240
1241
1242 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1243
1244 (((
1245 The DI port of LT-22222-L can support NPN or PNP output sensor.
1246 )))
1247
1248 (((
1249 (((
1250 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
1251 )))
1252 )))
1253
1254 [[image:1653357170703-587.png]]
1255
1256 (((
1257 (((
1258 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1259 )))
1260 )))
1261
1262 (((
1263
1264 )))
1265
1266 (((
1267 (% style="color:blue" %)**Example1**(%%): Connect to a Low active sensor.
1268 )))
1269
1270 (((
1271 This type of sensor will output a low signal GND when active.
1272 )))
1273
1274 * (((
1275 Connect sensor’s output to DI1-
1276 )))
1277 * (((
1278 Connect sensor’s VCC to DI1+.
1279 )))
1280
1281 (((
1282 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1283 )))
1284
1285 (((
1286 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1287 )))
1288
1289 (((
1290 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.
1291 )))
1292
1293 (((
1294
1295 )))
1296
1297 (((
1298 (% style="color:blue" %)**Example2**(%%): Connect to a High active sensor.
1299 )))
1300
1301 (((
1302 This type of sensor will output a high signal (example 24v) when active.
1303 )))
1304
1305 * (((
1306 Connect sensor’s output to DI1+
1307 )))
1308 * (((
1309 Connect sensor’s GND DI1-.
1310 )))
1311
1312 (((
1313 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1314 )))
1315
1316 (((
1317 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1318 )))
1319
1320 (((
1321 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.
1322 )))
1323
1324 (((
1325
1326 )))
1327
1328 (((
1329 (% style="color:blue" %)**Example3**(%%): Connect to a 220v high active sensor.
1330 )))
1331
1332 (((
1333 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1334 )))
1335
1336 * (((
1337 Connect sensor’s output to DI1+ with a serial 50K resistor
1338 )))
1339 * (((
1340 Connect sensor’s GND DI1-.
1341 )))
1342
1343 (((
1344 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1345 )))
1346
1347 (((
1348 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1349 )))
1350
1351 (((
1352 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.
1353 )))
1354
1355
1356
1357 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1358
1359 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1360
1361 [[image:1653357531600-905.png]]
1362
1363
1364
1365 === 3.6.4 Analog Input Interface ===
1366
1367 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:
1368
1369
1370 (% style="color:blue" %)**AC2 = (IN2 voltage )/12**
1371
1372 [[image:1653357592296-182.png]]
1373
1374 Example to connect a 4~~20mA sensor
1375
1376 We take the wind speed sensor as an example for reference only.
1377
1378
1379 **Specifications of the wind speed sensor:**
1380
1381 Red:  12~~24v
1382
1383 Yellow:  4~~20mA
1384
1385 Black:  GND
1386
1387
1388 **Connection diagram:**
1389
1390 [[image:1653357640609-758.png]]
1391
1392 [[image:1653357648330-671.png||height="155" width="733"]]
1393
1394
1395
1396 === 3.6.5 Relay Output ===
1397
1398 (((
1399 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:
1400 )))
1401
1402 [[image:image-20220524100215-9.png]]
1403
1404 [[image:image-20220524100215-10.png||height="382" width="723"]]
1405
1406
1407
1408 == 3.7 LEDs Indicators ==
1409
1410 [[image:image-20220524100748-11.png]]
1411
1412
1413
1414 = 4. Use AT Command =
1415
1416 == 4.1 Access AT Command ==
1417
1418 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.
1419
1420 [[image:1653358238933-385.png]]
1421
1422
1423 (((
1424 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:
1425 )))
1426
1427 [[image:1653358355238-883.png]]
1428
1429
1430 (((
1431 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/]]
1432 )))
1433
1434 (((
1435 AT+<CMD>?        : Help on <CMD>
1436 )))
1437
1438 (((
1439 AT+<CMD>         : Run <CMD>
1440 )))
1441
1442 (((
1443 AT+<CMD>=<value> : Set the value
1444 )))
1445
1446 (((
1447 AT+<CMD>=?       : Get the value
1448 )))
1449
1450 (((
1451 ATZ: Trig a reset of the MCU
1452 )))
1453
1454 (((
1455 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1456 )))
1457
1458 (((
1459 AT+DEUI: Get or Set the Device EUI
1460 )))
1461
1462 (((
1463 AT+DADDR: Get or Set the Device Address
1464 )))
1465
1466 (((
1467 AT+APPKEY: Get or Set the Application Key
1468 )))
1469
1470 (((
1471 AT+NWKSKEY: Get or Set the Network Session Key
1472 )))
1473
1474 (((
1475 AT+APPSKEY: Get or Set the Application Session Key
1476 )))
1477
1478 (((
1479 AT+APPEUI: Get or Set the Application EUI
1480 )))
1481
1482 (((
1483 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1484 )))
1485
1486 (((
1487 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1488 )))
1489
1490 (((
1491 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1492 )))
1493
1494 (((
1495 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1496 )))
1497
1498 (((
1499 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1500 )))
1501
1502 (((
1503 AT+RX2FQ: Get or Set the Rx2 window frequency
1504 )))
1505
1506 (((
1507 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1508 )))
1509
1510 (((
1511 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1512 )))
1513
1514 (((
1515 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1516 )))
1517
1518 (((
1519 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1520 )))
1521
1522 (((
1523 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1524 )))
1525
1526 (((
1527 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1528 )))
1529
1530 (((
1531 AT+NWKID: Get or Set the Network ID
1532 )))
1533
1534 (((
1535 AT+FCU: Get or Set the Frame Counter Uplink
1536 )))
1537
1538 (((
1539 AT+FCD: Get or Set the Frame Counter Downlink
1540 )))
1541
1542 (((
1543 AT+CLASS: Get or Set the Device Class
1544 )))
1545
1546 (((
1547 AT+JOIN: Join network
1548 )))
1549
1550 (((
1551 AT+NJS: Get OTAA Join Status
1552 )))
1553
1554 (((
1555 AT+SENDB: Send hexadecimal data along with the application port
1556 )))
1557
1558 (((
1559 AT+SEND: Send text data along with the application port
1560 )))
1561
1562 (((
1563 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1564 )))
1565
1566 (((
1567 AT+RECV: Print last received data in raw format
1568 )))
1569
1570 (((
1571 AT+VER: Get current image version and Frequency Band
1572 )))
1573
1574 (((
1575 AT+CFM: Get or Set the confirmation mode (0-1)
1576 )))
1577
1578 (((
1579 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1580 )))
1581
1582 (((
1583 AT+SNR: Get the SNR of the last received packet
1584 )))
1585
1586 (((
1587 AT+RSSI: Get the RSSI of the last received packet
1588 )))
1589
1590 (((
1591 AT+TDC: Get or set the application data transmission interval in ms
1592 )))
1593
1594 (((
1595 AT+PORT: Get or set the application port
1596 )))
1597
1598 (((
1599 AT+DISAT: Disable AT commands
1600 )))
1601
1602 (((
1603 AT+PWORD: Set password, max 9 digits
1604 )))
1605
1606 (((
1607 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1608 )))
1609
1610 (((
1611 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1612 )))
1613
1614 (((
1615 AT+CFG: Print all settings
1616 )))
1617
1618
1619
1620 == 4.2 Common AT Command Sequence ==
1621
1622 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1623
1624 (((
1625
1626
1627 **If device has not joined network yet:**
1628 )))
1629
1630 (((
1631 (% style="background-color:#dcdcdc" %)123456
1632 )))
1633
1634 (((
1635 (% style="background-color:#dcdcdc" %)AT+FDR
1636 )))
1637
1638 (((
1639 (% style="background-color:#dcdcdc" %)123456
1640 )))
1641
1642 (((
1643 (% style="background-color:#dcdcdc" %)AT+NJM=0
1644 )))
1645
1646 (((
1647 (% style="background-color:#dcdcdc" %)ATZ
1648 )))
1649
1650
1651 (((
1652 **If device already joined network:**
1653 )))
1654
1655 (((
1656 (% style="background-color:#dcdcdc" %)AT+NJM=0
1657 )))
1658
1659 (((
1660 (% style="background-color:#dcdcdc" %)ATZ
1661 )))
1662
1663
1664
1665 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1666
1667 (((
1668
1669
1670 (% style="background-color:#dcdcdc" %)123456(%%)  Enter Password to have AT access.
1671 )))
1672
1673 (((
1674 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1675 )))
1676
1677 (((
1678 (% style="background-color:#dcdcdc" %) 123456(%%)  Enter Password to have AT access.
1679 )))
1680
1681 (((
1682 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1683 )))
1684
1685 (((
1686 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%)  Set to ABP mode
1687 )))
1688
1689 (((
1690 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%)  Set the Adaptive Data Rate Off
1691 )))
1692
1693 (((
1694 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1695 )))
1696
1697 (((
1698 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1699 )))
1700
1701 (((
1702 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1703 )))
1704
1705 (((
1706 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%)  Set RX2Frequency to 868.4Mhz (according to the result from server)
1707 )))
1708
1709 (((
1710 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1711 )))
1712
1713 (((
1714 (% 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.
1715 )))
1716
1717 (((
1718 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1719
1720
1721 )))
1722
1723 (((
1724 (% style="color:red" %)**Note:**
1725 )))
1726
1727 (((
1728 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1729 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1730 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.
1731 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
1732 )))
1733
1734 (((
1735 [[image:1653359097980-169.png||height="188" width="729"]]
1736 )))
1737
1738 (((
1739
1740 )))
1741
1742
1743 === 4.2.3 Change to Class A ===
1744
1745 If sensor JOINED
1746 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1747 ATZ
1748
1749
1750 = 5. FAQ =
1751
1752 == 5.1 How to upgrade the image? ==
1753
1754
1755 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1756
1757 * Support new features
1758 * For bug fix
1759 * Change LoRaWAN bands.
1760
1761 Below shows the hardware connection for how to upload an image to the LT:
1762
1763 [[image:1653359603330-121.png]]
1764
1765
1766 (((
1767 (% style="color:blue" %)**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]].
1768 (% style="color:blue" %)**Step2**(%%)**:** Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1769 (% style="color:blue" %)**Step3**(%%)**:** Open flashloader; choose the correct COM port to update.
1770
1771
1772 (% style="color:blue" %)**For LT-22222-L**(%%):
1773 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.
1774 )))
1775
1776 [[image:image-20220524103407-12.png]]
1777
1778 [[image:image-20220524103429-13.png]]
1779
1780 [[image:image-20220524104033-15.png]]
1781
1782
1783 (% 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:
1784
1785 [[image:1653360054704-518.png||height="186" width="745"]]
1786
1787
1788 (((
1789 (((
1790
1791
1792 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1793 )))
1794 )))
1795
1796 (((
1797 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1798 )))
1799
1800 (((
1801
1802
1803 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1804 )))
1805
1806 (((
1807 (((
1808 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1809 )))
1810 )))
1811
1812 (((
1813 (((
1814 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1815
1816
1817 )))
1818 )))
1819
1820 (((
1821 (% 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.
1822 )))
1823
1824 (((
1825 [[image:1653360231087-571.png||height="401" width="727"]]
1826 )))
1827
1828 (((
1829 (% 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.
1830 )))
1831
1832
1833 (((
1834 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1835 )))
1836
1837 (((
1838 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1839 (% style="background-color:#dcdcdc" %)AT+FDR(%%)  Reset Parameters to Factory Default, Keys Reserve
1840 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1841 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%) Set to ABP mode
1842 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%) Set the Adaptive Data Rate Off
1843 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1844 (% style="background-color:#dcdcdc" %)AT+TDC=60000 (%%) Set transmit interval to 60 seconds
1845 (% style="background-color:#dcdcdc" %)AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1846 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%)  Set Device Address to 26 01 1A F1
1847 (% style="background-color:#dcdcdc" %)ATZ        (%%) Reset MCU
1848 )))
1849
1850
1851 (((
1852 As shown in below:
1853 )))
1854
1855 [[image:1653360498588-932.png||height="485" width="726"]]
1856
1857
1858 == 5.4 Can I see counting event in Serial? ==
1859
1860 (((
1861 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.
1862
1863
1864 == 5.5 Can i use point to point communication for LT-22222-L? ==
1865
1866 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1867
1868
1869 )))
1870
1871 (((
1872 == 5.6 Why does the relay output become the default and open relay after the lt22222 is powered off? ==
1873
1874 If the device is not shut down, but directly powered off.
1875
1876 It will default that this is a power-off state.
1877
1878 In modes 2 to 5, DO RO status and pulse count are saved in flash.
1879
1880 After restart, the status before power failure will be read from flash.
1881
1882
1883 = 6. Trouble Shooting =
1884 )))
1885
1886 (((
1887 (((
1888 == 6.1 Downlink doesn’t work, how to solve it? ==
1889 )))
1890 )))
1891
1892 (((
1893 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1894 )))
1895
1896 (((
1897
1898
1899 == 6.2 Have trouble to upload image. ==
1900 )))
1901
1902 (((
1903 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
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 = 7. Order Info =
1918
1919 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1920
1921
1922 (% style="color:#4f81bd" %)**XXX:**
1923
1924 * (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1925 * (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1926 * (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1927 * (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1928 * (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1929 * (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1930 * (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1931 * (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1932 * (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1933
1934 = 8. Packing Info =
1935
1936
1937 **Package Includes**:
1938
1939 * LT-22222-L I/O Controller x 1
1940 * Stick Antenna for LoRa RF part x 1
1941 * Bracket for controller x1
1942 * Program cable x 1
1943
1944 **Dimension and weight**:
1945
1946 * Device Size: 13.5 x 7 x 3 cm
1947 * Device Weight: 105g
1948 * Package Size / pcs : 14.5 x 8 x 5 cm
1949 * Weight / pcs : 170g
1950
1951 = 9. Support =
1952
1953 * (((
1954 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.
1955 )))
1956 * (((
1957 Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
1958
1959
1960
1961
1962 )))
1963
1964 = 10. Reference​​​​​ =
1965
1966 * 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]]
1967 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
1968 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
1969 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]

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