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Version 82.6 by Xiaoling on 2022/06/20 11:17
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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
186
187 == 1.4  Applications ==
188
189 * Smart Buildings & Home Automation
190 * Logistics and Supply Chain Management
191 * Smart Metering
192 * Smart Agriculture
193 * Smart Cities
194 * Smart Factory
195
196
197
198
199 == 1.5 Hardware Variants ==
200
201 (% border="1" style="background-color:#f7faff; width:500px" %)
202 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
203 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
204 * 2 x Digital Input (Bi-direction)
205 * 2 x Digital Output
206 * 2 x Relay Output (5A@250VAC / 30VDC)
207 * 2 x 0~~20mA Analog Input (res:0.01mA)
208 * 2 x 0~~30V Analog Input (res:0.01v)
209 * 1 x Counting Port
210 )))
211
212
213 = 2. Power ON Device =
214
215 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.
216
217 (((
218 PWR will on when device is properly powered.
219 )))
220
221 [[image:1653297104069-180.png]]
222
223
224
225 = 3. Operation Mode =
226
227 == 3.1 How it works? ==
228
229 (((
230 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. 
231 )))
232
233 (((
234 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.
235 )))
236
237
238 == 3.2 Example to join LoRaWAN network ==
239
240 (((
241 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. 
242 )))
243
244 [[image:image-20220523172350-1.png||height="266" width="864"]]
245
246
247 (((
248 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:
249 )))
250
251 (((
252 (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LT IO controller.
253 )))
254
255 (((
256 Each LT is shipped with a sticker with the default device EUI as below:
257 )))
258
259 [[image:1653297924498-393.png]]
260
261
262 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
263
264 Add APP EUI in the application.
265
266 [[image:1653297955910-247.png||height="321" width="716"]]
267
268
269 Add APP KEY and DEV EUI
270
271 [[image:1653298023685-319.png]]
272
273
274 (((
275 (% 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.
276 )))
277
278 [[image:1653298044601-602.png||height="405" width="709"]]
279
280
281
282 == 3.3 Uplink Payload ==
283
284 There are five working modes + one interrupt mode on LT for different type application:
285
286 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
287 * **MOD2**: Double DI Counting + DO + RO
288 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
289 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
290 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
291 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
292
293 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
294
295 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
296
297 [[image:image-20220523174024-3.png]]
298
299 (((
300
301
302 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
303 )))
304
305 [[image:image-20220523174254-4.png]]
306
307 * RO is for relay. ROx=1 : close，ROx=0 always open.
308 * DI is for digital input. DIx=1: high or float, DIx=0: low.
309 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
310
311 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
312
313 For example if payload is: [[image:image-20220523175847-2.png]]
314
315
316 **The value for the interface is:  **
317
318 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
319
320 AVI2 channel voltage is 0x04AC/1000=1.196V
321
322 ACI1 channel current is 0x1310/1000=4.880mA
323
324 ACI2 channel current is 0x1300/1000=4.864mA
325
326 The last byte 0xAA= 10101010(B) means
327
328 * [1] RO1 relay channel is close and the RO1 LED is ON.
329 * [0] RO2 relay channel is open and RO2 LED is OFF;
330
331 **LT22222-L:**
332
333 * [1] DI2 channel is high input and DI2 LED is ON;
334 * [0] DI1 channel is low input;
335
336 * [0] DO3 channel output state
337 ** DO3 is float in case no load between DO3 and V+.;
338 ** DO3 is high in case there is load between DO3 and V+.
339 ** DO3 LED is off in both case
340 * [1] DO2 channel output is low and DO2 LED is ON.
341 * [0] DO1 channel output state
342 ** DO1 is float in case no load between DO1 and V+.;
343 ** DO1 is high in case there is load between DO1 and V+.
344 ** DO1 LED is off in both case
345
346 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
347
348
349 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
350
351 (((
352 Total : 11 bytes payload
353 )))
354
355 [[image:image-20220523180452-3.png]]
356
357
358 (((
359 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
360 )))
361
362 [[image:image-20220523180506-4.png]]
363
364 * RO is for relay. ROx=1 : close，ROx=0 always open.
365 * FIRST: Indicate this is the first packet after join network.
366 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
367
368 (((
369 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
370 )))
371
372 (((
373
374
375 **To use counting mode, please run:**
376 )))
377
378 (% class="box infomessage" %)
379 (((
380 (((
381 **AT+MOD=2**
382 )))
383 )))
384
385 (% class="box infomessage" %)
386 (((
387 (((
388 **ATZ**
389 )))
390 )))
391
392 (((
393
394
395 (% style="color:#4f81bd" %)**AT Commands for counting:**
396 )))
397
398 (((
399 **For LT22222-L:**
400 )))
401
402 (% class="box infomessage" %)
403 (((
404 (((
405 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
406 )))
407 )))
408
409 (% class="box infomessage" %)
410 (((
411 (((
412 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
413 )))
414 )))
415
416 (% class="box infomessage" %)
417 (((
418 (((
419 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
420 )))
421 )))
422
423 (% class="box infomessage" %)
424 (((
425 (((
426 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
427 )))
428 )))
429
430 (% class="box infomessage" %)
431 (((
432 (((
433 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
434 )))
435 )))
436
437 (% class="box infomessage" %)
438 (((
439 (((
440 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
441 )))
442 )))
443
444
445
446 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
447
448 **LT22222-L**: This mode the DI1 is used as a counting pin.
449
450 [[image:image-20220523181246-5.png]]
451
452 (((
453 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
454 )))
455
456 [[image:image-20220523181301-6.png]]
457
458 * RO is for relay. ROx=1 : close，ROx=0 always open.
459 * FIRST: Indicate this is the first packet after join network.
460 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
461
462 (((
463 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
464 )))
465
466 (((
467 **To use counting mode, please run:**
468 )))
469
470 (% class="box infomessage" %)
471 (((
472 (((
473 **AT+MOD=3**
474 )))
475 )))
476
477 (% class="box infomessage" %)
478 (((
479 (((
480 **ATZ**
481 )))
482 )))
483
484 (((
485 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
486 )))
487
488
489
490 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
491
492
493 **LT22222-L**: This mode the DI1 is used as a counting pin.
494
495 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.
496
497 [[image:image-20220523181903-8.png]]
498
499
500 (((
501 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
502 )))
503
504 [[image:image-20220523181727-7.png]]
505
506 * RO is for relay. ROx=1 : close，ROx=0 always open.
507 * FIRST: Indicate this is the first packet after join network.
508 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
509
510 (((
511 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
512 )))
513
514 (((
515
516
517 **To use this mode, please run:**
518 )))
519
520 (% class="box infomessage" %)
521 (((
522 (((
523 **AT+MOD=4**
524 )))
525 )))
526
527 (% class="box infomessage" %)
528 (((
529 (((
530 **ATZ**
531 )))
532 )))
533
534 (((
535
536 )))
537
538 (((
539 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
540 )))
541
542 (((
543
544
545 **Plus below command for AVI1 Counting:**
546 )))
547
548 (% class="box infomessage" %)
549 (((
550 (((
551 **AT+SETCNT=3,60   (set AVI Count to 60)**
552 )))
553 )))
554
555 (% class="box infomessage" %)
556 (((
557 (((
558 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
559 )))
560 )))
561
562 (% class="box infomessage" %)
563 (((
564 (((
565 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
566 )))
567 )))
568
569 (% class="box infomessage" %)
570 (((
571 (((
572 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
573 )))
574 )))
575
576
577
578 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
579
580
581 **LT22222-L**: This mode the DI1 is used as a counting pin.
582
583 [[image:image-20220523182334-9.png]]
584
585 (((
586
587
588 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
589 )))
590
591 * RO is for relay. ROx=1 : close，ROx=0 always open.
592 * FIRST: Indicate this is the first packet after join network.
593 * (((
594 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
595 )))
596
597 (((
598 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
599 )))
600
601 (((
602
603
604 **To use this mode, please run:**
605 )))
606
607 (% class="box infomessage" %)
608 (((
609 (((
610 **AT+MOD=5**
611 )))
612 )))
613
614 (% class="box infomessage" %)
615 (((
616 (((
617 **ATZ**
618 )))
619 )))
620
621 (((
622 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
623 )))
624
625
626
627 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
628
629
630 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
631
632 For example, if user has configured below commands:
633
634 * **AT+MOD=1 ** **~-~->** The normal working mode
635 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
636
637 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
638
639 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
640 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.**
641
642 **AT Command to set Trigger Condition**:
643
644 (% style="color:#4f81bd" %)**Trigger base on voltage**:
645
646 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
647
648 **Example:**
649
650 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)
651
652 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
653
654
655
656 (% style="color:#4f81bd" %)**Trigger base on current**:
657
658 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
659
660 **Example:**
661
662 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
663
664
665
666 (% style="color:#4f81bd" %)**Trigger base on DI status**:
667
668 DI status trigger Flag.
669
670 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
671
672
673 **Example:**
674
675 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
676
677
678 **Downlink Command to set Trigger Condition:**
679
680 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
681
682 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
683
684 AA: Code for this downlink Command:
685
686 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
687
688 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
689
690 yy2 yy2: AC1 or AV1 high limit.
691
692 yy3 yy3: AC2 or AV2 low limit.
693
694 Yy4 yy4: AC2 or AV2 high limit.
695
696
697 **Example1**: AA 00 13 88 00 00 00 00 00 00
698
699 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
700
701
702 **Example2**: AA 02 01 00
703
704 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
705
706
707
708 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
709
710 MOD6 Payload : total 11 bytes payload
711
712 [[image:image-20220524085923-1.png]]
713
714
715 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
716
717 [[image:image-20220524090106-2.png]]
718
719 * Each bits shows if the corresponding trigger has been configured.
720
721 **Example:**
722
723 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
724
725
726 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
727
728 [[image:image-20220524090249-3.png]]
729
730 * Each bits shows which status has been trigger on this uplink.
731
732 **Example:**
733
734 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
735
736
737 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
738
739 [[image:image-20220524090456-4.png]]
740
741 * Each bits shows which status has been trigger on this uplink.
742
743 **Example:**
744
745 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
746
747 00000101: Means both DI1 and DI2 trigger are enabled.
748
749
750 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
751
752 Downlink command to poll MOD6 status:
753
754 **AB 06**
755
756 When device got this command, it will send the MOD6 payload.
757
758
759
760 === 3.3.7 Payload Decoder ===
761
762 (((
763
764
765 **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/]]
766
767
768 )))
769
770
771 == 3.4 ​Configure LT via AT or Downlink ==
772
773 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
774
775 (((
776 There are two kinds of Commands:
777 )))
778
779 * (% 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]]
780
781 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
782
783 === 3.4.1 Common Commands ===
784
785 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]]
786
787
788
789 === 3.4.2 Sensor related commands ===
790
791 ==== 3.4.2.1 Set Transmit Interval ====
792
793 Set device uplink interval.
794
795 * AT Command:
796
797 (% class="box infomessage" %)
798 (((
799 **AT+TDC=N **
800 )))
801
802 **Example: **AT+TDC=30000. Means set interval to 30 seconds
803
804
805 * Downlink Payload (prefix 0x01):
806
807 (% class="box infomessage" %)
808 (((
809 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
810 )))
811
812
813
814 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
815
816 Set work mode.
817
818 * AT Command:
819
820 (% class="box infomessage" %)
821 (((
822 **AT+MOD=N  **
823 )))
824
825 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
826
827
828 * Downlink Payload (prefix 0x0A):
829
830 (% class="box infomessage" %)
831 (((
832 **0x0A aa     ~/~/ Same as AT+MOD=aa**
833 )))
834
835
836
837 ==== 3.4.2.3 Poll an uplink ====
838
839 * AT Command:
840
841 There is no AT Command to poll uplink
842
843
844 * Downlink Payload (prefix 0x08):
845
846 (% class="box infomessage" %)
847 (((
848 **0x08 FF     ~/~/ Poll an uplink,**
849 )))
850
851 **Example**: 0x08FF, ask device to send an Uplink
852
853
854
855 ==== 3.4.2.4 Enable Trigger Mode ====
856
857 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
858
859 * AT Command:
860
861 (% class="box infomessage" %)
862 (((
863 **AT+ADDMOD6=1 or 0**
864 )))
865
866 1: Enable Trigger Mode
867
868 0: Disable Trigger Mode
869
870
871 * Downlink Payload (prefix 0x0A 06):
872
873 (% class="box infomessage" %)
874 (((
875 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
876 )))
877
878
879
880 ==== 3.4.2.5 Poll trigger settings ====
881
882 Poll trigger settings,
883
884 * AT Command:
885
886 There is no AT Command for this feature.
887
888
889 * Downlink Payload (prefix 0x AB 06):
890
891 (% class="box infomessage" %)
892 (((
893 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
894 )))
895
896
897
898 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
899
900 Enable Disable DI1/DI2/DI2 as trigger,
901
902 * AT Command:
903
904 (% class="box infomessage" %)
905 (((
906 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
907 )))
908
909
910 **Example:**
911
912 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
913
914 * Downlink Payload (prefix 0xAA 02):
915
916 (% class="box infomessage" %)
917 (((
918 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
919 )))
920
921
922
923 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
924
925 Set DI1 or DI3(for LT-33222-L) trigger.
926
927 * AT Command:
928
929 (% class="box infomessage" %)
930 (((
931 **AT+TRIG1=a,b**
932 )))
933
934 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
935
936 b : delay timing.
937
938
939 **Example:**
940
941 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
942
943
944 * Downlink Payload (prefix 0x09 01 ):
945
946 (% class="box infomessage" %)
947 (((
948 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
949 )))
950
951
952
953 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
954
955 Set DI2 trigger.
956
957 * AT Command:
958
959 (% class="box infomessage" %)
960 (((
961 **AT+TRIG2=a,b**
962 )))
963
964 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
965
966 b : delay timing.
967
968
969 **Example:**
970
971 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
972
973
974 * Downlink Payload (prefix 0x09 02 ):
975
976 (% class="box infomessage" %)
977 (((
978 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
979 )))
980
981
982
983 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
984
985 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
986
987 * AT Command:
988
989 (% class="box infomessage" %)
990 (((
991 **AT+ACLIM. **
992 )))
993
994
995 * Downlink Payload (prefix 0xAA 01 ):
996
997 (% class="box infomessage" %)
998 (((
999 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
1000 )))
1001
1002
1003
1004 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
1005
1006 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
1007
1008 * AT Command:
1009
1010 (% class="box infomessage" %)
1011 (((
1012 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
1013 )))
1014
1015
1016 * Downlink Payload (prefix 0xAA 00 ):
1017
1018 (% class="box infomessage" %)
1019 (((
1020 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
1021 )))
1022
1023
1024
1025 ==== 3.4.2.11 Trigger – Set minimum interval ====
1026
1027 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
1028
1029 * AT Command:
1030
1031 (% class="box infomessage" %)
1032 (((
1033 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
1034 )))
1035
1036
1037 * Downlink Payload (prefix 0xAC ):
1038
1039 (% class="box infomessage" %)
1040 (((
1041 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
1042 )))
1043
1044
1045
1046 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1047
1048 * AT Command:
1049
1050 There is no AT Command to control Digital Output
1051
1052
1053 * Downlink Payload (prefix 0x02):
1054
1055 (% class="box infomessage" %)
1056 (((
1057 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1058 )))
1059
1060 (((
1061 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1062 )))
1063
1064 (((
1065 01: Low,  00: High ,  11: No action
1066 )))
1067
1068 [[image:image-20220524092754-5.png]]
1069
1070 (((
1071 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1072 )))
1073
1074 (((
1075 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1076 )))
1077
1078
1079
1080 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1081
1082 * AT Command:
1083
1084 There is no AT Command to control Digital Output
1085
1086
1087 * Downlink Payload (prefix 0xA9):
1088
1089 (% class="box infomessage" %)
1090 (((
1091 (((
1092 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1093 )))
1094 )))
1095
1096 This is to control the digital output time of DO pin. Include four bytes:
1097
1098 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1099
1100 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1101
1102 01: DO pins will change back to original state after timeout.
1103
1104 00: DO pins will change to an inverter state after timeout 
1105
1106
1107 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1108
1109 [[image:image-20220524093238-6.png]]
1110
1111
1112 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1113
1114 [[image:image-20220524093328-7.png]]
1115
1116
1117 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1118
1119 [[image:image-20220524093351-8.png]]
1120
1121
1122 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1123
1124 Latching time. Unit: ms
1125
1126 Device will upload a packet if downlink code executes successfully.
1127
1128
1129 **Example payload:**
1130
1131 **~1. A9 01 01 01 01 07 D0**
1132
1133 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1134
1135 **2. A9 01 00 01 11 07 D0**
1136
1137 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1138
1139 **3. A9 00 00 00 00 07 D0**
1140
1141 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1142
1143 **4. A9 00 11 01 00 07 D0**
1144
1145 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
1146
1147
1148
1149 ==== 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ====
1150
1151 * AT Command:
1152
1153 There is no AT Command to control Relay Output
1154
1155
1156 * Downlink Payload (prefix 0x03):
1157
1158 (% class="box infomessage" %)
1159 (((
1160 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1161 )))
1162
1163 (((
1164 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1165 )))
1166
1167 (((
1168 01: Close ,  00: Open , 11: No action
1169 )))
1170
1171 (((
1172 [[image:image-20220524093724-9.png]]
1173 )))
1174
1175 Device will upload a packet if downlink code executes successfully.
1176
1177
1178
1179 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1180
1181 * AT Command:
1182
1183 There is no AT Command to control Relay Output
1184
1185
1186 * Downlink Payload (prefix 0x05):
1187
1188 (% class="box infomessage" %)
1189 (((
1190 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1191 )))
1192
1193 This is to control the relay output time of relay. Include four bytes:
1194
1195 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1196
1197 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1198
1199 01: Relays will change back to original state after timeout.
1200
1201 00: Relays will change to an inverter state after timeout
1202
1203
1204 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1205
1206 [[image:image-20220524093831-10.png]]
1207
1208
1209 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1210
1211 Device will upload a packet if downlink code executes successfully.
1212
1213
1214 **Example payload:**
1215
1216 **~1. 05 01 11 07 D0**
1217
1218 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1219
1220 **2. 05 01 10 07 D0**
1221
1222 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1223
1224 **3. 05 00 01 07 D0**
1225
1226 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1227
1228 **4. 05 00 00 07 D0**
1229
1230 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1231
1232
1233
1234 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1235
1236 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1237
1238 * AT Command:
1239
1240 (% class="box infomessage" %)
1241 (((
1242 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1243 )))
1244
1245
1246 * Downlink Payload (prefix 0xA5):
1247
1248 (% class="box infomessage" %)
1249 (((
1250 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1251 )))
1252
1253
1254
1255 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1256
1257 * AT Command:
1258
1259 (% class="box infomessage" %)
1260 (((
1261 **AT+SETCNT=aa,(bb cc dd ee) **
1262 )))
1263
1264 aa: 1: Set count1,
1265
1266 2: Set count2,
1267
1268 3: Set AV1 count
1269
1270 Bb cc dd ee: number to be set
1271
1272
1273 * Downlink Payload (prefix 0xA8):
1274
1275 (% class="box infomessage" %)
1276 (((
1277 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1278 )))
1279
1280
1281
1282 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1283
1284 Clear counting for counting mode
1285
1286 * AT Command:
1287
1288 (% class="box infomessage" %)
1289 (((
1290 **AT+CLRCOUNT ~/~/ clear all counting**
1291 )))
1292
1293 * Downlink Payload (prefix 0xA6):
1294
1295 (% class="box infomessage" %)
1296 (((
1297 **0x A6 01     ~/~/ clear all counting,**
1298 )))
1299
1300
1301
1302 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1303
1304 * AT Command:
1305
1306 (% class="box infomessage" %)
1307 (((
1308 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1309 )))
1310
1311 * Downlink Payload (prefix 0xA7):
1312
1313 (% class="box infomessage" %)
1314 (((
1315 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1316 )))
1317
1318 (((
1319 range: aa bb cc:0 to 16777215,  (unit:second)
1320
1321
1322 )))
1323
1324
1325 == 3.5 Integrate with Mydevice ==
1326
1327 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:
1328
1329 (((
1330 (% style="color:blue" %)**Step 1**(%%): Be sure that your device is programmed and properly connected to the network at this time.
1331 )))
1332
1333 (((
1334 (% 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:
1335 )))
1336
1337 [[image:1653356737703-362.png||height="232" width="732"]]
1338
1339 [[image:image-20220524094641-11.png||height="390" width="723"]]
1340
1341
1342 [[image:image-20220524094641-12.png||height="402" width="718"]]
1343
1344
1345 (% style="color:blue" %)**Step 3**(%%): Create an account or log in Mydevices.
1346
1347 (% style="color:blue" %)**Step 4**(%%): Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1348
1349 Search under The things network
1350
1351 [[image:1653356838789-523.png||height="337" width="740"]]
1352
1353
1354
1355 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1356
1357 [[image:image-20220524094909-1.png||height="335" width="729"]]
1358
1359
1360 [[image:image-20220524094909-2.png||height="337" width="729"]]
1361
1362
1363 [[image:image-20220524094909-3.png||height="338" width="727"]]
1364
1365
1366 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1367
1368
1369 [[image:image-20220524094909-5.png||height="341" width="734"]]
1370
1371
1372
1373 == 3.6 Interface Detail ==
1374
1375 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1376
1377 Support NPN Type sensor
1378
1379 [[image:1653356991268-289.png]]
1380
1381
1382
1383 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1384
1385 (((
1386 The DI port of LT-22222-L can support NPN or PNP output sensor.
1387 )))
1388
1389 (((
1390 (((
1391 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
1392 )))
1393 )))
1394
1395 [[image:1653357170703-587.png]]
1396
1397 (((
1398 (((
1399 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1400 )))
1401 )))
1402
1403 (((
1404
1405 )))
1406
1407 (((
1408 (% style="color:blue" %)**Example1**(%%): Connect to a Low active sensor.
1409 )))
1410
1411 (((
1412 This type of sensor will output a low signal GND when active.
1413 )))
1414
1415 * (((
1416 Connect sensor’s output to DI1-
1417 )))
1418 * (((
1419 Connect sensor’s VCC to DI1+.
1420 )))
1421
1422 (((
1423 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1424 )))
1425
1426 (((
1427 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1428 )))
1429
1430 (((
1431 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.
1432 )))
1433
1434 (((
1435
1436 )))
1437
1438 (((
1439 (% style="color:blue" %)**Example2**(%%): Connect to a High active sensor.
1440 )))
1441
1442 (((
1443 This type of sensor will output a high signal (example 24v) when active.
1444 )))
1445
1446 * (((
1447 Connect sensor’s output to DI1+
1448 )))
1449 * (((
1450 Connect sensor’s GND DI1-.
1451 )))
1452
1453 (((
1454 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1455 )))
1456
1457 (((
1458 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1459 )))
1460
1461 (((
1462 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.
1463 )))
1464
1465 (((
1466
1467 )))
1468
1469 (((
1470 (% style="color:blue" %)**Example3**(%%): Connect to a 220v high active sensor.
1471 )))
1472
1473 (((
1474 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1475 )))
1476
1477 * (((
1478 Connect sensor’s output to DI1+ with a serial 50K resistor
1479 )))
1480 * (((
1481 Connect sensor’s GND DI1-.
1482 )))
1483
1484 (((
1485 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1486 )))
1487
1488 (((
1489 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1490 )))
1491
1492 (((
1493 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.
1494 )))
1495
1496
1497
1498 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1499
1500 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1501
1502 [[image:1653357531600-905.png]]
1503
1504
1505
1506 === 3.6.4 Analog Input Interface ===
1507
1508 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:
1509
1510
1511 (% style="color:blue" %)**AC2 = (IN2 voltage )/12**
1512
1513 [[image:1653357592296-182.png]]
1514
1515 Example to connect a 4~~20mA sensor
1516
1517 We take the wind speed sensor as an example for reference only.
1518
1519
1520 **Specifications of the wind speed sensor:**
1521
1522 Red:  12~~24v
1523
1524 Yellow:  4~~20mA
1525
1526 Black:  GND
1527
1528
1529 **Connection diagram:**
1530
1531 [[image:1653357640609-758.png]]
1532
1533 [[image:1653357648330-671.png||height="155" width="733"]]
1534
1535
1536
1537 === 3.6.5 Relay Output ===
1538
1539 (((
1540 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:
1541 )))
1542
1543 [[image:image-20220524100215-9.png]]
1544
1545 [[image:image-20220524100215-10.png||height="382" width="723"]]
1546
1547
1548
1549 == 3.7 LEDs Indicators ==
1550
1551 [[image:image-20220524100748-11.png]]
1552
1553
1554 = 4. Use AT Command =
1555
1556 == 4.1 Access AT Command ==
1557
1558 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.
1559
1560 [[image:1653358238933-385.png]]
1561
1562
1563 (((
1564 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:
1565 )))
1566
1567 [[image:1653358355238-883.png]]
1568
1569
1570 (((
1571 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/]]
1572 )))
1573
1574 (((
1575 AT+<CMD>?        : Help on <CMD>
1576 )))
1577
1578 (((
1579 AT+<CMD>         : Run <CMD>
1580 )))
1581
1582 (((
1583 AT+<CMD>=<value> : Set the value
1584 )))
1585
1586 (((
1587 AT+<CMD>=?       : Get the value
1588 )))
1589
1590 (((
1591 ATZ: Trig a reset of the MCU
1592 )))
1593
1594 (((
1595 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1596 )))
1597
1598 (((
1599 AT+DEUI: Get or Set the Device EUI
1600 )))
1601
1602 (((
1603 AT+DADDR: Get or Set the Device Address
1604 )))
1605
1606 (((
1607 AT+APPKEY: Get or Set the Application Key
1608 )))
1609
1610 (((
1611 AT+NWKSKEY: Get or Set the Network Session Key
1612 )))
1613
1614 (((
1615 AT+APPSKEY: Get or Set the Application Session Key
1616 )))
1617
1618 (((
1619 AT+APPEUI: Get or Set the Application EUI
1620 )))
1621
1622 (((
1623 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1624 )))
1625
1626 (((
1627 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1628 )))
1629
1630 (((
1631 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1632 )))
1633
1634 (((
1635 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1636 )))
1637
1638 (((
1639 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1640 )))
1641
1642 (((
1643 AT+RX2FQ: Get or Set the Rx2 window frequency
1644 )))
1645
1646 (((
1647 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1648 )))
1649
1650 (((
1651 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1652 )))
1653
1654 (((
1655 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1656 )))
1657
1658 (((
1659 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1660 )))
1661
1662 (((
1663 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1664 )))
1665
1666 (((
1667 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1668 )))
1669
1670 (((
1671 AT+NWKID: Get or Set the Network ID
1672 )))
1673
1674 (((
1675 AT+FCU: Get or Set the Frame Counter Uplink
1676 )))
1677
1678 (((
1679 AT+FCD: Get or Set the Frame Counter Downlink
1680 )))
1681
1682 (((
1683 AT+CLASS: Get or Set the Device Class
1684 )))
1685
1686 (((
1687 AT+JOIN: Join network
1688 )))
1689
1690 (((
1691 AT+NJS: Get OTAA Join Status
1692 )))
1693
1694 (((
1695 AT+SENDB: Send hexadecimal data along with the application port
1696 )))
1697
1698 (((
1699 AT+SEND: Send text data along with the application port
1700 )))
1701
1702 (((
1703 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1704 )))
1705
1706 (((
1707 AT+RECV: Print last received data in raw format
1708 )))
1709
1710 (((
1711 AT+VER: Get current image version and Frequency Band
1712 )))
1713
1714 (((
1715 AT+CFM: Get or Set the confirmation mode (0-1)
1716 )))
1717
1718 (((
1719 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1720 )))
1721
1722 (((
1723 AT+SNR: Get the SNR of the last received packet
1724 )))
1725
1726 (((
1727 AT+RSSI: Get the RSSI of the last received packet
1728 )))
1729
1730 (((
1731 AT+TDC: Get or set the application data transmission interval in ms
1732 )))
1733
1734 (((
1735 AT+PORT: Get or set the application port
1736 )))
1737
1738 (((
1739 AT+DISAT: Disable AT commands
1740 )))
1741
1742 (((
1743 AT+PWORD: Set password, max 9 digits
1744 )))
1745
1746 (((
1747 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1748 )))
1749
1750 (((
1751 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1752 )))
1753
1754 (((
1755 AT+CFG: Print all settings
1756
1757
1758 )))
1759
1760
1761
1762 == 4.2 Common AT Command Sequence ==
1763
1764 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1765
1766 (((
1767
1768
1769 **If device has not joined network yet:**
1770 )))
1771
1772 (((
1773 (% style="background-color:#dcdcdc" %)123456
1774 )))
1775
1776 (((
1777 (% style="background-color:#dcdcdc" %)AT+FDR
1778 )))
1779
1780 (((
1781 (% style="background-color:#dcdcdc" %)123456
1782 )))
1783
1784 (((
1785 (% style="background-color:#dcdcdc" %)AT+NJM=0
1786 )))
1787
1788 (((
1789 (% style="background-color:#dcdcdc" %)ATZ
1790 )))
1791
1792
1793 (((
1794 **If device already joined network:**
1795 )))
1796
1797 (((
1798 (% style="background-color:#dcdcdc" %)AT+NJM=0
1799 )))
1800
1801 (((
1802 (% style="background-color:#dcdcdc" %)ATZ
1803
1804
1805 )))
1806
1807
1808
1809 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1810
1811 (((
1812
1813
1814 (% style="background-color:#dcdcdc" %)123456(%%)  Enter Password to have AT access.
1815 )))
1816
1817 (((
1818 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1819 )))
1820
1821 (((
1822 (% style="background-color:#dcdcdc" %) 123456(%%)  Enter Password to have AT access.
1823 )))
1824
1825 (((
1826 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1827 )))
1828
1829 (((
1830 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%)  Set to ABP mode
1831 )))
1832
1833 (((
1834 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%)  Set the Adaptive Data Rate Off
1835 )))
1836
1837 (((
1838 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1839 )))
1840
1841 (((
1842 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1843 )))
1844
1845 (((
1846 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1847 )))
1848
1849 (((
1850 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%)  Set RX2Frequency to 868.4Mhz (according to the result from server)
1851 )))
1852
1853 (((
1854 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1855 )))
1856
1857 (((
1858 (% 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.
1859 )))
1860
1861 (((
1862 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1863
1864
1865 )))
1866
1867 (((
1868 (% style="color:red" %)**Note:**
1869 )))
1870
1871 (((
1872 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1873 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1874 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.
1875 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
1876 )))
1877
1878 (((
1879 [[image:1653359097980-169.png||height="188" width="729"]]
1880 )))
1881
1882 (((
1883
1884 )))
1885
1886
1887 === 4.2.3 Change to Class A ===
1888
1889 If sensor JOINED
1890 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1891 ATZ
1892
1893
1894 = 5. FAQ =
1895
1896 == 5.1 How to upgrade the image? ==
1897
1898
1899 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1900
1901 * Support new features
1902 * For bug fix
1903 * Change LoRaWAN bands.
1904
1905 Below shows the hardware connection for how to upload an image to the LT:
1906
1907 [[image:1653359603330-121.png]]
1908
1909
1910 (((
1911 (% 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]].
1912 (% 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/]].
1913 (% style="color:blue" %)**Step3**(%%)**:** Open flashloader; choose the correct COM port to update.
1914
1915
1916 (% style="color:blue" %)**For LT-22222-L**(%%):
1917 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.
1918 )))
1919
1920 [[image:image-20220524103407-12.png]]
1921
1922 [[image:image-20220524103429-13.png]]
1923
1924 [[image:image-20220524104033-15.png]]
1925
1926
1927 (% 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:
1928
1929 [[image:1653360054704-518.png||height="186" width="745"]]
1930
1931
1932 (((
1933 (((
1934
1935
1936 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1937 )))
1938 )))
1939
1940 (((
1941 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1942 )))
1943
1944 (((
1945
1946
1947 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1948 )))
1949
1950 (((
1951 (((
1952 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1953 )))
1954 )))
1955
1956 (((
1957 (((
1958 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1959
1960
1961 )))
1962 )))
1963
1964 (((
1965 (% 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.
1966 )))
1967
1968 (((
1969 [[image:1653360231087-571.png||height="401" width="727"]]
1970 )))
1971
1972 (((
1973 (% 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.
1974 )))
1975
1976
1977 (((
1978 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1979 )))
1980
1981 (((
1982 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1983 (% style="background-color:#dcdcdc" %)AT+FDR(%%)  Reset Parameters to Factory Default, Keys Reserve
1984 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1985 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%) Set to ABP mode
1986 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%) Set the Adaptive Data Rate Off
1987 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1988 (% style="background-color:#dcdcdc" %)AT+TDC=60000 (%%) Set transmit interval to 60 seconds
1989 (% style="background-color:#dcdcdc" %)AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1990 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%)  Set Device Address to 26 01 1A F1
1991 (% style="background-color:#dcdcdc" %)ATZ        (%%) Reset MCU
1992 )))
1993
1994
1995 (((
1996 As shown in below:
1997 )))
1998
1999 [[image:1653360498588-932.png||height="485" width="726"]]
2000
2001
2002 == 5.4 Can I see counting event in Serial? ==
2003
2004 (((
2005 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.
2006
2007
2008 == 5.5 Can i use point to point communication for LT-22222-L? ==
2009
2010 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
2011 )))
2012
2013 (((
2014 == 5.6 Why does the relay output become the default and open relay after the lt22222 is powered off? ==
2015
2016 If the device is not shut down, but directly powered off.
2017
2018 It will default that this is a power-off state.
2019
2020 In modes 2 to 5, DO RO status and pulse count are saved in flash.
2021
2022 After restart, the status before power failure will be read from flash.
2023
2024 = 6. Trouble Shooting =
2025 )))
2026
2027 (((
2028 (((
2029 == 6.1 Downlink doesn’t work, how to solve it? ==
2030 )))
2031 )))
2032
2033 (((
2034 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
2035 )))
2036
2037 (((
2038
2039
2040 == 6.2 Have trouble to upload image. ==
2041 )))
2042
2043 (((
2044 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
2045 )))
2046
2047 (((
2048
2049
2050 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
2051 )))
2052
2053 (((
2054 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
2055 )))
2056
2057
2058
2059 = 7. Order Info =
2060
2061
2062 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
2063
2064
2065 (% style="color:#4f81bd" %)**XXX:**
2066
2067 * (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
2068 * (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
2069 * (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
2070 * (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
2071 * (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
2072 * (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
2073 * (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2074 * (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2075 * (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2076
2077 = 8. Packing Info =
2078
2079
2080 **Package Includes**:
2081
2082 * LT-22222-L I/O Controller x 1
2083 * Stick Antenna for LoRa RF part x 1
2084 * Bracket for controller x1
2085 * Program cable x 1
2086
2087 **Dimension and weight**:
2088
2089 * Device Size: 13.5 x 7 x 3 cm
2090 * Device Weight: 105g
2091 * Package Size / pcs : 14.5 x 8 x 5 cm
2092 * Weight / pcs : 170g
2093
2094 = 9. Support =
2095
2096 * (((
2097 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.
2098 )))
2099 * (((
2100 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]]
2101 )))
2102
2103 = 10. Reference​​​​​ =
2104
2105 * 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]]
2106 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2107 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2108 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]