Version 79.2 by Xiaoling on 2022/06/10 09:40
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1 (% style="text-align:center" %)
2 [[image:image-20220523163353-1.jpeg||height="604" width="500"]]
3
4 **LT-22222-L LoRa IO Controller User Manual **
5
6
7 **Table of Contents:**
8
9 {{toc/}}
10
11
12
13
14
15
16
17 = 1.Introduction =
18
19 == 1.1 What is LT Series I/O Controller ==
20
21 (((
22 The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
23 )))
24
25 (((
26 The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
27 )))
28
29 (((
30 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
31 )))
32
33 (((
34 The use environment includes:
35 )))
36
37 (((
38 1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.
39 )))
40
41 (((
42 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
43 )))
44
45 (((
46 [[image:1653295757274-912.png]]
47
48
49 )))
50
51 == 1.2  Specifications ==
52
53 (((
54
55
56 **Hardware System:**
57 )))
58
59 * (((
60 STM32L072CZT6 MCU
61 )))
62 * (((
63 SX1276/78 Wireless Chip 
64 )))
65 * (((
66 (((
67 Power Consumption:
68 )))
69
70 * (((
71 Idle: 4mA@12v
72 )))
73 * (((
74 20dB Transmit: 34mA@12v
75 )))
76 )))
77
78 (((
79
80
81 **Interface for Model: LT22222-L:**
82 )))
83
84 * (((
85 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
86 )))
87 * (((
88 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
89 )))
90 * (((
91 2 x Relay Output (5A@250VAC / 30VDC)
92 )))
93 * (((
94 2 x 0~~20mA Analog Input (res:0.01mA)
95 )))
96 * (((
97 2 x 0~~30V Analog Input (res:0.01v)
98 )))
99 * (((
100 Power Input 7~~ 24V DC. 
101 )))
102
103 (((
104
105
106 **LoRa Spec:**
107 )))
108
109 * (((
110 (((
111 Frequency Range:
112 )))
113
114 * (((
115 Band 1 (HF): 862 ~~ 1020 Mhz
116 )))
117 * (((
118 Band 2 (LF): 410 ~~ 528 Mhz
119 )))
120 )))
121 * (((
122 168 dB maximum link budget.
123 )))
124 * (((
125 +20 dBm - 100 mW constant RF output vs.
126 )))
127 * (((
128 +14 dBm high efficiency PA.
129 )))
130 * (((
131 Programmable bit rate up to 300 kbps.
132 )))
133 * (((
134 High sensitivity: down to -148 dBm.
135 )))
136 * (((
137 Bullet-proof front end: IIP3 = -12.5 dBm.
138 )))
139 * (((
140 Excellent blocking immunity.
141 )))
142 * (((
143 Low RX current of 10.3 mA, 200 nA register retention.
144 )))
145 * (((
146 Fully integrated synthesizer with a resolution of 61 Hz.
147 )))
148 * (((
149 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
150 )))
151 * (((
152 Built-in bit synchronizer for clock recovery.
153 )))
154 * (((
155 Preamble detection.
156 )))
157 * (((
158 127 dB Dynamic Range RSSI.
159 )))
160 * (((
161 Automatic RF Sense and CAD with ultra-fast AFC.
162 )))
163 * (((
164 Packet engine up to 256 bytes with CRC.
165 )))
166
167 == 1.3 Features ==
168
169 * LoRaWAN Class A & Class C protocol
170 * Optional Customized LoRa Protocol
171 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
172 * AT Commands to change parameters
173 * Remote configure parameters via LoRa Downlink
174 * Firmware upgradable via program port
175 * Counting
176
177 == 1.4  Applications ==
178
179 * Smart Buildings & Home Automation
180 * Logistics and Supply Chain Management
181 * Smart Metering
182 * Smart Agriculture
183 * Smart Cities
184 * Smart Factory
185
186 == 1.5 Hardware Variants ==
187
188 (% border="1" style="background-color:#f7faff; width:500px" %)
189 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
190 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
191 * 2 x Digital Input (Bi-direction)
192 * 2 x Digital Output
193 * 2 x Relay Output (5A@250VAC / 30VDC)
194 * 2 x 0~~20mA Analog Input (res:0.01mA)
195 * 2 x 0~~30V Analog Input (res:0.01v)
196 * 1 x Counting Port
197 )))
198
199 = 2. Power ON Device =
200
201 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.
202
203 (((
204 PWR will on when device is properly powered.
205 )))
206
207 [[image:1653297104069-180.png]]
208
209
210
211 = 3. Operation Mode =
212
213 == 3.1 How it works? ==
214
215 (((
216 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. 
217 )))
218
219 (((
220 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.
221 )))
222
223
224 == 3.2 Example to join LoRaWAN network ==
225
226 (((
227 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. 
228 )))
229
230 [[image:image-20220523172350-1.png||height="266" width="864"]]
231
232
233 (((
234 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:
235 )))
236
237 (((
238 (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LT IO controller.
239 )))
240
241 (((
242 Each LT is shipped with a sticker with the default device EUI as below:
243 )))
244
245 [[image:1653297924498-393.png]]
246
247
248 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
249
250 Add APP EUI in the application.
251
252 [[image:1653297955910-247.png||height="321" width="716"]]
253
254
255 Add APP KEY and DEV EUI
256
257 [[image:1653298023685-319.png]]
258
259
260 (((
261 (% 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.
262 )))
263
264 [[image:1653298044601-602.png||height="405" width="709"]]
265
266
267
268 == 3.3 Uplink Payload ==
269
270 There are five working modes + one interrupt mode on LT for different type application:
271
272 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
273 * **MOD2**: Double DI Counting + DO + RO
274 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
275 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
276 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
277 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
278
279
280 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
281
282 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
283
284 [[image:image-20220523174024-3.png]]
285
286 (((
287
288
289 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
290 )))
291
292 [[image:image-20220523174254-4.png]]
293
294 * RO is for relay. ROx=1 : close，ROx=0 always open.
295 * DI is for digital input. DIx=1: high or float, DIx=0: low.
296 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
297
298 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
299
300 For example if payload is: [[image:image-20220523175847-2.png]]
301
302
303 **The value for the interface is:  **
304
305 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
306
307 AVI2 channel voltage is 0x04AC/1000=1.196V
308
309 ACI1 channel current is 0x1310/1000=4.880mA
310
311 ACI2 channel current is 0x1300/1000=4.864mA
312
313 The last byte 0xAA= 10101010(B) means
314
315 * [1] RO1 relay channel is close and the RO1 LED is ON.
316 * [0] RO2 relay channel is open and RO2 LED is OFF;
317
318
319
320 **LT22222-L:**
321
322 * [1] DI2 channel is high input and DI2 LED is ON;
323 * [0] DI1 channel is low input;
324
325 * [0] DO3 channel output state
326 ** DO3 is float in case no load between DO3 and V+.;
327 ** DO3 is high in case there is load between DO3 and V+.
328 ** DO3 LED is off in both case
329 * [1] DO2 channel output is low and DO2 LED is ON.
330 * [0] DO1 channel output state
331 ** DO1 is float in case no load between DO1 and V+.;
332 ** DO1 is high in case there is load between DO1 and V+.
333 ** DO1 LED is off in both case
334
335
336 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
337
338
339 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
340
341 (((
342 Total : 11 bytes payload
343 )))
344
345 [[image:image-20220523180452-3.png]]
346
347
348 (((
349 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
350 )))
351
352 [[image:image-20220523180506-4.png]]
353
354 * RO is for relay. ROx=1 : close，ROx=0 always open.
355 * FIRST: Indicate this is the first packet after join network.
356 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
357
358 (((
359 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
360 )))
361
362 (((
363
364
365 **To use counting mode, please run:**
366 )))
367
368 (% class="box infomessage" %)
369 (((
370 (((
371 **AT+MOD=2**
372 )))
373 )))
374
375 (% class="box infomessage" %)
376 (((
377 (((
378 **ATZ**
379 )))
380 )))
381
382 (((
383
384
385 (% style="color:#4f81bd" %)**AT Commands for counting:**
386 )))
387
388 (((
389 **For LT22222-L:**
390 )))
391
392 (% class="box infomessage" %)
393 (((
394 (((
395 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
396 )))
397 )))
398
399 (% class="box infomessage" %)
400 (((
401 (((
402 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
403 )))
404 )))
405
406 (% class="box infomessage" %)
407 (((
408 (((
409 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
410 )))
411 )))
412
413 (% class="box infomessage" %)
414 (((
415 (((
416 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
417 )))
418 )))
419
420 (% class="box infomessage" %)
421 (((
422 (((
423 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
424 )))
425 )))
426
427 (% class="box infomessage" %)
428 (((
429 (((
430 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
431 )))
432 )))
433
434
435
436 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
437
438 **LT22222-L**: This mode the DI1 is used as a counting pin.
439
440 [[image:image-20220523181246-5.png]]
441
442 (((
443 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
444 )))
445
446 [[image:image-20220523181301-6.png]]
447
448 * RO is for relay. ROx=1 : close，ROx=0 always open.
449 * FIRST: Indicate this is the first packet after join network.
450 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
451
452 (((
453 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
454 )))
455
456 (((
457 **To use counting mode, please run:**
458 )))
459
460 (% class="box infomessage" %)
461 (((
462 (((
463 **AT+MOD=3**
464 )))
465 )))
466
467 (% class="box infomessage" %)
468 (((
469 (((
470 **ATZ**
471 )))
472 )))
473
474 (((
475 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
476
477
478 )))
479
480
481
482 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
483
484
485 **LT22222-L**: This mode the DI1 is used as a counting pin.
486
487 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.
488
489 [[image:image-20220523181903-8.png]]
490
491
492 (((
493 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
494 )))
495
496 [[image:image-20220523181727-7.png]]
497
498 * RO is for relay. ROx=1 : close，ROx=0 always open.
499 * FIRST: Indicate this is the first packet after join network.
500 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
501
502 (((
503 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
504 )))
505
506 (((
507
508
509 **To use this mode, please run:**
510 )))
511
512 (% class="box infomessage" %)
513 (((
514 (((
515 **AT+MOD=4**
516 )))
517 )))
518
519 (% class="box infomessage" %)
520 (((
521 (((
522 **ATZ**
523 )))
524 )))
525
526 (((
527
528 )))
529
530 (((
531 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
532 )))
533
534 (((
535
536
537 **Plus below command for AVI1 Counting:**
538 )))
539
540 (% class="box infomessage" %)
541 (((
542 (((
543 **AT+SETCNT=3,60   (set AVI Count to 60)**
544 )))
545 )))
546
547 (% class="box infomessage" %)
548 (((
549 (((
550 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
551 )))
552 )))
553
554 (% class="box infomessage" %)
555 (((
556 (((
557 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
558 )))
559 )))
560
561 (% class="box infomessage" %)
562 (((
563 (((
564 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
565 )))
566 )))
567
568
569
570 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
571
572
573 **LT22222-L**: This mode the DI1 is used as a counting pin.
574
575 [[image:image-20220523182334-9.png]]
576
577 (((
578
579
580 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
581 )))
582
583 * RO is for relay. ROx=1 : close，ROx=0 always open.
584 * FIRST: Indicate this is the first packet after join network.
585 * (((
586 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
587 )))
588
589 (((
590 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
591 )))
592
593 (((
594
595
596 **To use this mode, please run:**
597 )))
598
599 (% class="box infomessage" %)
600 (((
601 (((
602 **AT+MOD=5**
603 )))
604 )))
605
606 (% class="box infomessage" %)
607 (((
608 (((
609 **ATZ**
610 )))
611 )))
612
613 (((
614 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
615 )))
616
617
618
619 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
620
621
622 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
623
624 For example, if user has configured below commands:
625
626 * **AT+MOD=1 ** **~-~->** The normal working mode
627 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
628
629 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
630
631 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
632 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.**
633
634 **AT Command to set Trigger Condition**:
635
636 (% style="color:#4f81bd" %)**Trigger base on voltage**:
637
638 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
639
640 **Example:**
641
642 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)
643
644 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
645
646
647
648 (% style="color:#4f81bd" %)**Trigger base on current**:
649
650 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
651
652 **Example:**
653
654 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
655
656
657
658 (% style="color:#4f81bd" %)**Trigger base on DI status**:
659
660 DI status trigger Flag.
661
662 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
663
664
665 **Example:**
666
667 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
668
669
670 **Downlink Command to set Trigger Condition:**
671
672 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
673
674 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
675
676 AA: Code for this downlink Command:
677
678 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
679
680 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
681
682 yy2 yy2: AC1 or AV1 high limit.
683
684 yy3 yy3: AC2 or AV2 low limit.
685
686 Yy4 yy4: AC2 or AV2 high limit.
687
688
689 **Example1**: AA 00 13 88 00 00 00 00 00 00
690
691 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
692
693
694 **Example2**: AA 02 01 00
695
696 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
697
698
699
700 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
701
702 MOD6 Payload : total 11 bytes payload
703
704 [[image:image-20220524085923-1.png]]
705
706
707 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
708
709 [[image:image-20220524090106-2.png]]
710
711 * Each bits shows if the corresponding trigger has been configured.
712
713 **Example:**
714
715 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
716
717
718 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
719
720 [[image:image-20220524090249-3.png]]
721
722 * Each bits shows which status has been trigger on this uplink.
723
724 **Example:**
725
726 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
727
728
729 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
730
731 [[image:image-20220524090456-4.png]]
732
733 * Each bits shows which status has been trigger on this uplink.
734
735 **Example:**
736
737 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
738
739 00000101: Means both DI1 and DI2 trigger are enabled.
740
741
742 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
743
744 Downlink command to poll MOD6 status:
745
746 **AB 06**
747
748 When device got this command, it will send the MOD6 payload.
749
750
751
752 === 3.3.7 Payload Decoder ===
753
754 (((
755
756
757 **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/]]
758
759
760 )))
761
762
763
764 == 3.4 ​Configure LT via AT or Downlink ==
765
766 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
767
768 (((
769 There are two kinds of Commands:
770 )))
771
772 * (% 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]]
773
774 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
775
776 === 3.4.1 Common Commands ===
777
778 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]]
779
780
781
782 === 3.4.2 Sensor related commands ===
783
784 ==== 3.4.2.1 Set Transmit Interval ====
785
786 Set device uplink interval.
787
788 * AT Command:
789
790 (% class="box infomessage" %)
791 (((
792 **AT+TDC=N **
793 )))
794
795 **Example: **AT+TDC=30000. Means set interval to 30 seconds
796
797
798 * Downlink Payload (prefix 0x01):
799
800 (% class="box infomessage" %)
801 (((
802 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
803 )))
804
805
806
807 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
808
809 Set work mode.
810
811 * AT Command:
812
813 (% class="box infomessage" %)
814 (((
815 **AT+MOD=N  **
816 )))
817
818 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
819
820
821 * Downlink Payload (prefix 0x0A):
822
823 (% class="box infomessage" %)
824 (((
825 **0x0A aa     ~/~/ Same as AT+MOD=aa**
826 )))
827
828
829
830 ==== 3.4.2.3 Poll an uplink ====
831
832 * AT Command:
833
834 There is no AT Command to poll uplink
835
836
837 * Downlink Payload (prefix 0x08):
838
839 (% class="box infomessage" %)
840 (((
841 **0x08 FF     ~/~/ Poll an uplink,**
842 )))
843
844 **Example**: 0x08FF, ask device to send an Uplink
845
846
847
848 ==== 3.4.2.4 Enable Trigger Mode ====
849
850 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
851
852 * AT Command:
853
854 (% class="box infomessage" %)
855 (((
856 **AT+ADDMOD6=1 or 0**
857 )))
858
859 1: Enable Trigger Mode
860
861 0: Disable Trigger Mode
862
863
864 * Downlink Payload (prefix 0x0A 06):
865
866 (% class="box infomessage" %)
867 (((
868 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
869 )))
870
871
872
873 ==== 3.4.2.5 Poll trigger settings ====
874
875 Poll trigger settings,
876
877 * AT Command:
878
879 There is no AT Command for this feature.
880
881
882 * Downlink Payload (prefix 0x AB 06):
883
884 (% class="box infomessage" %)
885 (((
886 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
887 )))
888
889
890
891 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
892
893 Enable Disable DI1/DI2/DI2 as trigger,
894
895 * AT Command:
896
897 (% class="box infomessage" %)
898 (((
899 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
900 )))
901
902
903 **Example:**
904
905 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
906
907 * Downlink Payload (prefix 0xAA 02):
908
909 (% class="box infomessage" %)
910 (((
911 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
912 )))
913
914
915
916 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
917
918 Set DI1 or DI3(for LT-33222-L) trigger.
919
920 * AT Command:
921
922 (% class="box infomessage" %)
923 (((
924 **AT+TRIG1=a,b**
925 )))
926
927 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
928
929 b : delay timing.
930
931
932 **Example:**
933
934 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
935
936
937 * Downlink Payload (prefix 0x09 01 ):
938
939 (% class="box infomessage" %)
940 (((
941 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
942 )))
943
944
945
946 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
947
948 Set DI2 trigger.
949
950 * AT Command:
951
952 (% class="box infomessage" %)
953 (((
954 **AT+TRIG2=a,b**
955 )))
956
957 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
958
959 b : delay timing.
960
961
962 **Example:**
963
964 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
965
966
967 * Downlink Payload (prefix 0x09 02 ):
968
969 (% class="box infomessage" %)
970 (((
971 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
972 )))
973
974
975
976 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
977
978 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
979
980 * AT Command:
981
982 (% class="box infomessage" %)
983 (((
984 **AT+ACLIM. **
985 )))
986
987
988 * Downlink Payload (prefix 0xAA 01 ):
989
990 (% class="box infomessage" %)
991 (((
992 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
993 )))
994
995
996
997 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
998
999 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
1000
1001 * AT Command:
1002
1003 (% class="box infomessage" %)
1004 (((
1005 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
1006 )))
1007
1008
1009 * Downlink Payload (prefix 0xAA 00 ):
1010
1011 (% class="box infomessage" %)
1012 (((
1013 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
1014 )))
1015
1016
1017
1018 ==== 3.4.2.11 Trigger – Set minimum interval ====
1019
1020 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
1021
1022 * AT Command:
1023
1024 (% class="box infomessage" %)
1025 (((
1026 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
1027 )))
1028
1029
1030 * Downlink Payload (prefix 0xAC ):
1031
1032 (% class="box infomessage" %)
1033 (((
1034 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
1035 )))
1036
1037
1038
1039 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1040
1041 * AT Command:
1042
1043 There is no AT Command to control Digital Output
1044
1045
1046 * Downlink Payload (prefix 0x02):
1047
1048 (% class="box infomessage" %)
1049 (((
1050 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1051 )))
1052
1053 (((
1054 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1055 )))
1056
1057 (((
1058 01: Low,  00: High ,  11: No action
1059 )))
1060
1061 [[image:image-20220524092754-5.png]]
1062
1063 (((
1064 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1065 )))
1066
1067 (((
1068 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1069 )))
1070
1071
1072
1073 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1074
1075 * AT Command:
1076
1077 There is no AT Command to control Digital Output
1078
1079
1080 * Downlink Payload (prefix 0xA9):
1081
1082 (% class="box infomessage" %)
1083 (((
1084 (((
1085 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1086 )))
1087 )))
1088
1089 This is to control the digital output time of DO pin. Include four bytes:
1090
1091 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1092
1093 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1094
1095 01: DO pins will change back to original state after timeout.
1096
1097 00: DO pins will change to an inverter state after timeout 
1098
1099
1100 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1101
1102 [[image:image-20220524093238-6.png]]
1103
1104
1105 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1106
1107 [[image:image-20220524093328-7.png]]
1108
1109
1110 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1111
1112 [[image:image-20220524093351-8.png]]
1113
1114
1115 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1116
1117 Latching time. Unit: ms
1118
1119 Device will upload a packet if downlink code executes successfully.
1120
1121
1122 **Example payload:**
1123
1124 **~1. A9 01 01 01 01 07 D0**
1125
1126 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1127
1128 **2. A9 01 00 01 11 07 D0**
1129
1130 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1131
1132 **3. A9 00 00 00 00 07 D0**
1133
1134 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1135
1136 **4. A9 00 11 01 00 07 D0**
1137
1138 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
1139
1140
1141
1142 ==== 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ====
1143
1144 * AT Command:
1145
1146 There is no AT Command to control Relay Output
1147
1148
1149 * Downlink Payload (prefix 0x03):
1150
1151 (% class="box infomessage" %)
1152 (((
1153 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1154 )))
1155
1156 (((
1157 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1158 )))
1159
1160 (((
1161 01: Close ,  00: Open , 11: No action
1162 )))
1163
1164 (((
1165 [[image:image-20220524093724-9.png]]
1166 )))
1167
1168 Device will upload a packet if downlink code executes successfully.
1169
1170
1171
1172 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1173
1174 * AT Command:
1175
1176 There is no AT Command to control Relay Output
1177
1178
1179 * Downlink Payload (prefix 0x05):
1180
1181 (% class="box infomessage" %)
1182 (((
1183 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1184 )))
1185
1186 This is to control the relay output time of relay. Include four bytes:
1187
1188 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1189
1190 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1191
1192 01: Relays will change back to original state after timeout.
1193
1194 00: Relays will change to an inverter state after timeout
1195
1196
1197 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1198
1199 [[image:image-20220524093831-10.png]]
1200
1201
1202 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1203
1204 Device will upload a packet if downlink code executes successfully.
1205
1206
1207 **Example payload:**
1208
1209 **~1. 05 01 11 07 D0**
1210
1211 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1212
1213 **2. 05 01 10 07 D0**
1214
1215 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1216
1217 **3. 05 00 01 07 D0**
1218
1219 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1220
1221 **4. 05 00 00 07 D0**
1222
1223 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1224
1225
1226
1227 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1228
1229 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1230
1231 * AT Command:
1232
1233 (% class="box infomessage" %)
1234 (((
1235 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1236 )))
1237
1238
1239 * Downlink Payload (prefix 0xA5):
1240
1241 (% class="box infomessage" %)
1242 (((
1243 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1244 )))
1245
1246
1247
1248 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1249
1250 * AT Command:
1251
1252 (% class="box infomessage" %)
1253 (((
1254 **AT+SETCNT=aa,(bb cc dd ee) **
1255 )))
1256
1257 aa: 1: Set count1,
1258
1259 2: Set count2,
1260
1261 3: Set AV1 count
1262
1263 Bb cc dd ee: number to be set
1264
1265
1266 * Downlink Payload (prefix 0xA8):
1267
1268 (% class="box infomessage" %)
1269 (((
1270 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1271 )))
1272
1273
1274
1275 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1276
1277 Clear counting for counting mode
1278
1279 * AT Command:
1280
1281 (% class="box infomessage" %)
1282 (((
1283 **AT+CLRCOUNT ~/~/ clear all counting**
1284 )))
1285
1286 * Downlink Payload (prefix 0xA6):
1287
1288 (% class="box infomessage" %)
1289 (((
1290 **0x A6 01     ~/~/ clear all counting,**
1291 )))
1292
1293
1294
1295 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1296
1297 * AT Command:
1298
1299 (% class="box infomessage" %)
1300 (((
1301 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1302 )))
1303
1304 * Downlink Payload (prefix 0xA7):
1305
1306 (% class="box infomessage" %)
1307 (((
1308 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1309 )))
1310
1311 (((
1312 range: aa bb cc:0 to 16777215,  (unit:second)
1313
1314
1315 )))
1316
1317
1318 == 3.5 Integrate with Mydevice ==
1319
1320 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:
1321
1322 (((
1323 (% style="color:blue" %)**Step 1**(%%): Be sure that your device is programmed and properly connected to the network at this time.
1324 )))
1325
1326 (((
1327 (% 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:
1328 )))
1329
1330 [[image:1653356737703-362.png||height="232" width="732"]]
1331
1332 [[image:image-20220524094641-11.png||height="390" width="723"]]
1333
1334
1335 [[image:image-20220524094641-12.png||height="402" width="718"]]
1336
1337
1338 (% style="color:blue" %)**Step 3**(%%): Create an account or log in Mydevices.
1339
1340 (% style="color:blue" %)**Step 4**(%%): Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1341
1342 Search under The things network
1343
1344 [[image:1653356838789-523.png||height="337" width="740"]]
1345
1346
1347
1348 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1349
1350 [[image:image-20220524094909-1.png||height="335" width="729"]]
1351
1352
1353 [[image:image-20220524094909-2.png||height="337" width="729"]]
1354
1355
1356 [[image:image-20220524094909-3.png||height="338" width="727"]]
1357
1358
1359 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1360
1361
1362 [[image:image-20220524094909-5.png||height="341" width="734"]]
1363
1364
1365
1366 == 3.6 Interface Detail ==
1367
1368 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1369
1370 Support NPN Type sensor
1371
1372 [[image:1653356991268-289.png]]
1373
1374
1375
1376 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1377
1378 (((
1379 The DI port of LT-22222-L can support NPN or PNP output sensor.
1380 )))
1381
1382 (((
1383 (((
1384 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
1385 )))
1386 )))
1387
1388 [[image:1653357170703-587.png]]
1389
1390 (((
1391 (((
1392 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1393 )))
1394 )))
1395
1396 (((
1397
1398 )))
1399
1400 (((
1401 (% style="color:blue" %)**Example1**(%%): Connect to a Low active sensor.
1402 )))
1403
1404 (((
1405 This type of sensor will output a low signal GND when active.
1406 )))
1407
1408 * (((
1409 Connect sensor’s output to DI1-
1410 )))
1411 * (((
1412 Connect sensor’s VCC to DI1+.
1413 )))
1414
1415 (((
1416 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1417 )))
1418
1419 (((
1420 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1421 )))
1422
1423 (((
1424 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.
1425 )))
1426
1427 (((
1428
1429 )))
1430
1431 (((
1432 (% style="color:blue" %)**Example2**(%%): Connect to a High active sensor.
1433 )))
1434
1435 (((
1436 This type of sensor will output a high signal (example 24v) when active.
1437 )))
1438
1439 * (((
1440 Connect sensor’s output to DI1+
1441 )))
1442 * (((
1443 Connect sensor’s GND DI1-.
1444 )))
1445
1446 (((
1447 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1448 )))
1449
1450 (((
1451 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1452 )))
1453
1454 (((
1455 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.
1456 )))
1457
1458 (((
1459
1460 )))
1461
1462 (((
1463 (% style="color:blue" %)**Example3**(%%): Connect to a 220v high active sensor.
1464 )))
1465
1466 (((
1467 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1468 )))
1469
1470 * (((
1471 Connect sensor’s output to DI1+ with a serial 50K resistor
1472 )))
1473 * (((
1474 Connect sensor’s GND DI1-.
1475 )))
1476
1477 (((
1478 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1479 )))
1480
1481 (((
1482 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1483 )))
1484
1485 (((
1486 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.
1487 )))
1488
1489
1490
1491 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1492
1493 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1494
1495 [[image:1653357531600-905.png]]
1496
1497
1498
1499 === 3.6.4 Analog Input Interface ===
1500
1501 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:
1502
1503
1504 (% style="color:blue" %)**AC2 = (IN2 voltage )/12**
1505
1506 [[image:1653357592296-182.png]]
1507
1508 Example to connect a 4~~20mA sensor
1509
1510 We take the wind speed sensor as an example for reference only.
1511
1512
1513 **Specifications of the wind speed sensor:**
1514
1515 Red:  12~~24v
1516
1517 Yellow:  4~~20mA
1518
1519 Black:  GND
1520
1521
1522 **Connection diagram:**
1523
1524 [[image:1653357640609-758.png]]
1525
1526 [[image:1653357648330-671.png||height="155" width="733"]]
1527
1528
1529
1530 === 3.6.5 Relay Output ===
1531
1532 (((
1533 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:
1534 )))
1535
1536 [[image:image-20220524100215-9.png]]
1537
1538 [[image:image-20220524100215-10.png||height="382" width="723"]]
1539
1540
1541
1542 == 3.7 LEDs Indicators ==
1543
1544 [[image:image-20220524100748-11.png]]
1545
1546
1547 = 4. Use AT Command =
1548
1549 == 4.1 Access AT Command ==
1550
1551 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.
1552
1553 [[image:1653358238933-385.png]]
1554
1555
1556 (((
1557 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:
1558 )))
1559
1560 [[image:1653358355238-883.png]]
1561
1562
1563 (((
1564 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/]]
1565 )))
1566
1567 (((
1568 AT+<CMD>?        : Help on <CMD>
1569 )))
1570
1571 (((
1572 AT+<CMD>         : Run <CMD>
1573 )))
1574
1575 (((
1576 AT+<CMD>=<value> : Set the value
1577 )))
1578
1579 (((
1580 AT+<CMD>=?       : Get the value
1581 )))
1582
1583 (((
1584 ATZ: Trig a reset of the MCU
1585 )))
1586
1587 (((
1588 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1589 )))
1590
1591 (((
1592 AT+DEUI: Get or Set the Device EUI
1593 )))
1594
1595 (((
1596 AT+DADDR: Get or Set the Device Address
1597 )))
1598
1599 (((
1600 AT+APPKEY: Get or Set the Application Key
1601 )))
1602
1603 (((
1604 AT+NWKSKEY: Get or Set the Network Session Key
1605 )))
1606
1607 (((
1608 AT+APPSKEY: Get or Set the Application Session Key
1609 )))
1610
1611 (((
1612 AT+APPEUI: Get or Set the Application EUI
1613 )))
1614
1615 (((
1616 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1617 )))
1618
1619 (((
1620 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1621 )))
1622
1623 (((
1624 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1625 )))
1626
1627 (((
1628 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1629 )))
1630
1631 (((
1632 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1633 )))
1634
1635 (((
1636 AT+RX2FQ: Get or Set the Rx2 window frequency
1637 )))
1638
1639 (((
1640 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1641 )))
1642
1643 (((
1644 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1645 )))
1646
1647 (((
1648 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1649 )))
1650
1651 (((
1652 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1653 )))
1654
1655 (((
1656 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1657 )))
1658
1659 (((
1660 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1661 )))
1662
1663 (((
1664 AT+NWKID: Get or Set the Network ID
1665 )))
1666
1667 (((
1668 AT+FCU: Get or Set the Frame Counter Uplink
1669 )))
1670
1671 (((
1672 AT+FCD: Get or Set the Frame Counter Downlink
1673 )))
1674
1675 (((
1676 AT+CLASS: Get or Set the Device Class
1677 )))
1678
1679 (((
1680 AT+JOIN: Join network
1681 )))
1682
1683 (((
1684 AT+NJS: Get OTAA Join Status
1685 )))
1686
1687 (((
1688 AT+SENDB: Send hexadecimal data along with the application port
1689 )))
1690
1691 (((
1692 AT+SEND: Send text data along with the application port
1693 )))
1694
1695 (((
1696 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1697 )))
1698
1699 (((
1700 AT+RECV: Print last received data in raw format
1701 )))
1702
1703 (((
1704 AT+VER: Get current image version and Frequency Band
1705 )))
1706
1707 (((
1708 AT+CFM: Get or Set the confirmation mode (0-1)
1709 )))
1710
1711 (((
1712 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1713 )))
1714
1715 (((
1716 AT+SNR: Get the SNR of the last received packet
1717 )))
1718
1719 (((
1720 AT+RSSI: Get the RSSI of the last received packet
1721 )))
1722
1723 (((
1724 AT+TDC: Get or set the application data transmission interval in ms
1725 )))
1726
1727 (((
1728 AT+PORT: Get or set the application port
1729 )))
1730
1731 (((
1732 AT+DISAT: Disable AT commands
1733 )))
1734
1735 (((
1736 AT+PWORD: Set password, max 9 digits
1737 )))
1738
1739 (((
1740 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1741 )))
1742
1743 (((
1744 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1745 )))
1746
1747 (((
1748 AT+CFG: Print all settings
1749
1750
1751 )))
1752
1753
1754
1755 == 4.2 Common AT Command Sequence ==
1756
1757 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1758
1759 (((
1760
1761
1762 **If device has not joined network yet:**
1763 )))
1764
1765 (((
1766 (% style="background-color:#dcdcdc" %)123456
1767 )))
1768
1769 (((
1770 (% style="background-color:#dcdcdc" %)AT+FDR
1771 )))
1772
1773 (((
1774 (% style="background-color:#dcdcdc" %)123456
1775 )))
1776
1777 (((
1778 (% style="background-color:#dcdcdc" %)AT+NJM=0
1779 )))
1780
1781 (((
1782 (% style="background-color:#dcdcdc" %)ATZ
1783 )))
1784
1785
1786 (((
1787 **If device already joined network:**
1788 )))
1789
1790 (((
1791 (% style="background-color:#dcdcdc" %)AT+NJM=0
1792 )))
1793
1794 (((
1795 (% style="background-color:#dcdcdc" %)ATZ
1796
1797
1798 )))
1799
1800
1801
1802 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1803
1804 (((
1805
1806
1807 (% style="background-color:#dcdcdc" %)123456(%%)  Enter Password to have AT access.
1808 )))
1809
1810 (((
1811 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1812 )))
1813
1814 (((
1815 (% style="background-color:#dcdcdc" %) 123456(%%)  Enter Password to have AT access.
1816 )))
1817
1818 (((
1819 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1820 )))
1821
1822 (((
1823 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%)  Set to ABP mode
1824 )))
1825
1826 (((
1827 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%)  Set the Adaptive Data Rate Off
1828 )))
1829
1830 (((
1831 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1832 )))
1833
1834 (((
1835 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1836 )))
1837
1838 (((
1839 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1840 )))
1841
1842 (((
1843 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%)  Set RX2Frequency to 868.4Mhz (according to the result from server)
1844 )))
1845
1846 (((
1847 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1848 )))
1849
1850 (((
1851 (% 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.
1852 )))
1853
1854 (((
1855 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1856
1857
1858 )))
1859
1860 (((
1861 (% style="color:red" %)**Note:**
1862 )))
1863
1864 (((
1865 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1866 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1867 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.
1868 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
1869 )))
1870
1871 (((
1872 [[image:1653359097980-169.png||height="188" width="729"]]
1873 )))
1874
1875 (((
1876
1877 )))
1878
1879
1880 === 4.2.3 Change to Class A ===
1881
1882 If sensor JOINED
1883 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1884 ATZ
1885
1886
1887 = 5. FAQ =
1888
1889 == 5.1 How to upgrade the image? ==
1890
1891
1892 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1893
1894 * Support new features
1895 * For bug fix
1896 * Change LoRaWAN bands.
1897
1898 Below shows the hardware connection for how to upload an image to the LT:
1899
1900 [[image:1653359603330-121.png]]
1901
1902
1903 (((
1904 (% 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]].
1905 (% 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/]].
1906 (% style="color:blue" %)**Step3**(%%)**:** Open flashloader; choose the correct COM port to update.
1907
1908
1909 (% style="color:blue" %)**For LT-22222-L**(%%):
1910 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.
1911 )))
1912
1913 [[image:image-20220524103407-12.png]]
1914
1915 [[image:image-20220524103429-13.png]]
1916
1917 [[image:image-20220524104033-15.png]]
1918
1919
1920 (% 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:
1921
1922 [[image:1653360054704-518.png||height="186" width="745"]]
1923
1924
1925 (((
1926 (((
1927
1928
1929 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1930 )))
1931 )))
1932
1933 (((
1934 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1935 )))
1936
1937 (((
1938
1939
1940 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1941 )))
1942
1943 (((
1944 (((
1945 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1946 )))
1947 )))
1948
1949 (((
1950 (((
1951 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1952
1953
1954 )))
1955 )))
1956
1957 (((
1958 (% 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.
1959 )))
1960
1961 (((
1962 [[image:1653360231087-571.png||height="401" width="727"]]
1963 )))
1964
1965 (((
1966 (% 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.
1967 )))
1968
1969
1970 (((
1971 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1972 )))
1973
1974 (((
1975 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1976 (% style="background-color:#dcdcdc" %)AT+FDR(%%)  Reset Parameters to Factory Default, Keys Reserve
1977 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1978 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%) Set to ABP mode
1979 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%) Set the Adaptive Data Rate Off
1980 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1981 (% style="background-color:#dcdcdc" %)AT+TDC=60000 (%%) Set transmit interval to 60 seconds
1982 (% style="background-color:#dcdcdc" %)AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1983 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%)  Set Device Address to 26 01 1A F1
1984 (% style="background-color:#dcdcdc" %)ATZ        (%%) Reset MCU
1985 )))
1986
1987
1988 (((
1989 As shown in below:
1990 )))
1991
1992 [[image:1653360498588-932.png||height="485" width="726"]]
1993
1994
1995 == 5.4 Can I see counting event in Serial? ==
1996
1997 (((
1998 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.
1999
2000
2001 == 5.5 Can i use point to point communication for LT-22222-L? ==
2002
2003 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
2004 )))
2005
2006 (((
2007
2008
2009 = 6. Trouble Shooting =
2010 )))
2011
2012 (((
2013 (((
2014 == 6.1 Downlink doesn’t work, how to solve it? ==
2015 )))
2016 )))
2017
2018 (((
2019 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
2020 )))
2021
2022 (((
2023
2024
2025 == 6.2 Have trouble to upload image. ==
2026 )))
2027
2028 (((
2029 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
2030 )))
2031
2032 (((
2033
2034
2035 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
2036 )))
2037
2038 (((
2039 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
2040 )))
2041
2042
2043
2044 = 7. Order Info =
2045
2046
2047 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
2048
2049
2050 (% style="color:#4f81bd" %)**XXX:**
2051
2052 * (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
2053 * (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
2054 * (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
2055 * (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
2056 * (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
2057 * (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
2058 * (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2059 * (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2060 * (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2061
2062 = 8. Packing Info =
2063
2064
2065 **Package Includes**:
2066
2067 * LT-22222-L I/O Controller x 1
2068 * Stick Antenna for LoRa RF part x 1
2069 * Bracket for controller x1
2070 * Program cable x 1
2071
2072 **Dimension and weight**:
2073
2074 * Device Size: 13.5 x 7 x 3 cm
2075 * Device Weight: 105g
2076 * Package Size / pcs : 14.5 x 8 x 5 cm
2077 * Weight / pcs : 170g
2078
2079 = 9. Support =
2080
2081 * (((
2082 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.
2083 )))
2084 * (((
2085 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]]
2086 )))
2087
2088 = 10. Reference​​​​​ =
2089
2090 * 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]]
2091 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2092 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2093 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
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