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Version 82.2 by Xiaoling on 2022/06/20 11:16
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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 == 1.3 Features ==
171
172 * LoRaWAN Class A & Class C protocol
173 * Optional Customized LoRa Protocol
174 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
175 * AT Commands to change parameters
176 * Remote configure parameters via LoRa Downlink
177 * Firmware upgradable via program port
178 * Counting
179
180 == 1.4  Applications ==
181
182 * Smart Buildings & Home Automation
183 * Logistics and Supply Chain Management
184 * Smart Metering
185 * Smart Agriculture
186 * Smart Cities
187 * Smart Factory
188
189 == 1.5 Hardware Variants ==
190
191 (% border="1" style="background-color:#f7faff; width:500px" %)
192 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
193 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
194 * 2 x Digital Input (Bi-direction)
195 * 2 x Digital Output
196 * 2 x Relay Output (5A@250VAC / 30VDC)
197 * 2 x 0~~20mA Analog Input (res:0.01mA)
198 * 2 x 0~~30V Analog Input (res:0.01v)
199 * 1 x Counting Port
200 )))
201
202 = 2. Power ON Device =
203
204 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.
205
206 (((
207 PWR will on when device is properly powered.
208 )))
209
210 [[image:1653297104069-180.png]]
211
212
213
214 = 3. Operation Mode =
215
216 == 3.1 How it works? ==
217
218 (((
219 The LT is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the LT. It will auto join the network via OTAA. For LT-22222-L, the LED will show the Join status: After power on **TX LED** will fast blink 5 times, LT-22222-L will enter working mode and start to JOIN LoRaWAN network. **TX LED** will be on for 5 seconds after joined in network. When there is message from server, the **RX LED** will be on for 1 second. 
220 )))
221
222 (((
223 In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>||anchor="H4.UseATCommand"]] to set the keys in the devices.
224 )))
225
226
227 == 3.2 Example to join LoRaWAN network ==
228
229 (((
230 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. 
231 )))
232
233 [[image:image-20220523172350-1.png||height="266" width="864"]]
234
235
236 (((
237 The LG308 is already set to connect to [[TTN network >>url:https://www.thethingsnetwork.org/]]. So what we need to do now is only configure register this device to TTN:
238 )))
239
240 (((
241 (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LT IO controller.
242 )))
243
244 (((
245 Each LT is shipped with a sticker with the default device EUI as below:
246 )))
247
248 [[image:1653297924498-393.png]]
249
250
251 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
252
253 Add APP EUI in the application.
254
255 [[image:1653297955910-247.png||height="321" width="716"]]
256
257
258 Add APP KEY and DEV EUI
259
260 [[image:1653298023685-319.png]]
261
262
263 (((
264 (% 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.
265 )))
266
267 [[image:1653298044601-602.png||height="405" width="709"]]
268
269
270
271 == 3.3 Uplink Payload ==
272
273 There are five working modes + one interrupt mode on LT for different type application:
274
275 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
276 * **MOD2**: Double DI Counting + DO + RO
277 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
278 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
279 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
280 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
281
282 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
283
284 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
285
286 [[image:image-20220523174024-3.png]]
287
288 (((
289
290
291 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
292 )))
293
294 [[image:image-20220523174254-4.png]]
295
296 * RO is for relay. ROx=1 : close，ROx=0 always open.
297 * DI is for digital input. DIx=1: high or float, DIx=0: low.
298 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
299
300 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
301
302 For example if payload is: [[image:image-20220523175847-2.png]]
303
304
305 **The value for the interface is:  **
306
307 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
308
309 AVI2 channel voltage is 0x04AC/1000=1.196V
310
311 ACI1 channel current is 0x1310/1000=4.880mA
312
313 ACI2 channel current is 0x1300/1000=4.864mA
314
315 The last byte 0xAA= 10101010(B) means
316
317 * [1] RO1 relay channel is close and the RO1 LED is ON.
318 * [0] RO2 relay channel is open and RO2 LED is OFF;
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 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
336
337
338 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
339
340 (((
341 Total : 11 bytes payload
342 )))
343
344 [[image:image-20220523180452-3.png]]
345
346
347 (((
348 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
349 )))
350
351 [[image:image-20220523180506-4.png]]
352
353 * RO is for relay. ROx=1 : close，ROx=0 always open.
354 * FIRST: Indicate this is the first packet after join network.
355 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
356
357 (((
358 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
359 )))
360
361 (((
362
363
364 **To use counting mode, please run:**
365 )))
366
367 (% class="box infomessage" %)
368 (((
369 (((
370 **AT+MOD=2**
371 )))
372 )))
373
374 (% class="box infomessage" %)
375 (((
376 (((
377 **ATZ**
378 )))
379 )))
380
381 (((
382
383
384 (% style="color:#4f81bd" %)**AT Commands for counting:**
385 )))
386
387 (((
388 **For LT22222-L:**
389 )))
390
391 (% class="box infomessage" %)
392 (((
393 (((
394 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
395 )))
396 )))
397
398 (% class="box infomessage" %)
399 (((
400 (((
401 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
402 )))
403 )))
404
405 (% class="box infomessage" %)
406 (((
407 (((
408 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
409 )))
410 )))
411
412 (% class="box infomessage" %)
413 (((
414 (((
415 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
416 )))
417 )))
418
419 (% class="box infomessage" %)
420 (((
421 (((
422 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
423 )))
424 )))
425
426 (% class="box infomessage" %)
427 (((
428 (((
429 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
430 )))
431 )))
432
433
434
435 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
436
437 **LT22222-L**: This mode the DI1 is used as a counting pin.
438
439 [[image:image-20220523181246-5.png]]
440
441 (((
442 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
443 )))
444
445 [[image:image-20220523181301-6.png]]
446
447 * RO is for relay. ROx=1 : close，ROx=0 always open.
448 * FIRST: Indicate this is the first packet after join network.
449 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
450
451 (((
452 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
453 )))
454
455 (((
456 **To use counting mode, please run:**
457 )))
458
459 (% class="box infomessage" %)
460 (((
461 (((
462 **AT+MOD=3**
463 )))
464 )))
465
466 (% class="box infomessage" %)
467 (((
468 (((
469 **ATZ**
470 )))
471 )))
472
473 (((
474 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
475 )))
476
477
478
479 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
480
481
482 **LT22222-L**: This mode the DI1 is used as a counting pin.
483
484 The AVI1 is also used for counting. AVI1 is used to monitor the voltage. It will check the voltage **every 60s**, if voltage is higher or lower than VOLMAX mV, the AVI1 Counting increase 1, so AVI1 counting can be used to measure a machine working hour.
485
486 [[image:image-20220523181903-8.png]]
487
488
489 (((
490 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
491 )))
492
493 [[image:image-20220523181727-7.png]]
494
495 * RO is for relay. ROx=1 : close，ROx=0 always open.
496 * FIRST: Indicate this is the first packet after join network.
497 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
498
499 (((
500 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
501 )))
502
503 (((
504
505
506 **To use this mode, please run:**
507 )))
508
509 (% class="box infomessage" %)
510 (((
511 (((
512 **AT+MOD=4**
513 )))
514 )))
515
516 (% class="box infomessage" %)
517 (((
518 (((
519 **ATZ**
520 )))
521 )))
522
523 (((
524
525 )))
526
527 (((
528 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
529 )))
530
531 (((
532
533
534 **Plus below command for AVI1 Counting:**
535 )))
536
537 (% class="box infomessage" %)
538 (((
539 (((
540 **AT+SETCNT=3,60   (set AVI Count to 60)**
541 )))
542 )))
543
544 (% class="box infomessage" %)
545 (((
546 (((
547 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
548 )))
549 )))
550
551 (% class="box infomessage" %)
552 (((
553 (((
554 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
555 )))
556 )))
557
558 (% class="box infomessage" %)
559 (((
560 (((
561 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
562 )))
563 )))
564
565
566
567 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
568
569
570 **LT22222-L**: This mode the DI1 is used as a counting pin.
571
572 [[image:image-20220523182334-9.png]]
573
574 (((
575
576
577 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
578 )))
579
580 * RO is for relay. ROx=1 : close，ROx=0 always open.
581 * FIRST: Indicate this is the first packet after join network.
582 * (((
583 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
584 )))
585
586 (((
587 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
588 )))
589
590 (((
591
592
593 **To use this mode, please run:**
594 )))
595
596 (% class="box infomessage" %)
597 (((
598 (((
599 **AT+MOD=5**
600 )))
601 )))
602
603 (% class="box infomessage" %)
604 (((
605 (((
606 **ATZ**
607 )))
608 )))
609
610 (((
611 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
612 )))
613
614
615
616 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
617
618
619 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
620
621 For example, if user has configured below commands:
622
623 * **AT+MOD=1 ** **~-~->** The normal working mode
624 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
625
626 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
627
628 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
629 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.**
630
631 **AT Command to set Trigger Condition**:
632
633 (% style="color:#4f81bd" %)**Trigger base on voltage**:
634
635 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
636
637 **Example:**
638
639 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)
640
641 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
642
643
644
645 (% style="color:#4f81bd" %)**Trigger base on current**:
646
647 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
648
649 **Example:**
650
651 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
652
653
654
655 (% style="color:#4f81bd" %)**Trigger base on DI status**:
656
657 DI status trigger Flag.
658
659 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
660
661
662 **Example:**
663
664 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
665
666
667 **Downlink Command to set Trigger Condition:**
668
669 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
670
671 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
672
673 AA: Code for this downlink Command:
674
675 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
676
677 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
678
679 yy2 yy2: AC1 or AV1 high limit.
680
681 yy3 yy3: AC2 or AV2 low limit.
682
683 Yy4 yy4: AC2 or AV2 high limit.
684
685
686 **Example1**: AA 00 13 88 00 00 00 00 00 00
687
688 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
689
690
691 **Example2**: AA 02 01 00
692
693 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
694
695
696
697 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
698
699 MOD6 Payload : total 11 bytes payload
700
701 [[image:image-20220524085923-1.png]]
702
703
704 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
705
706 [[image:image-20220524090106-2.png]]
707
708 * Each bits shows if the corresponding trigger has been configured.
709
710 **Example:**
711
712 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
713
714
715 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
716
717 [[image:image-20220524090249-3.png]]
718
719 * Each bits shows which status has been trigger on this uplink.
720
721 **Example:**
722
723 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
724
725
726 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
727
728 [[image:image-20220524090456-4.png]]
729
730 * Each bits shows which status has been trigger on this uplink.
731
732 **Example:**
733
734 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
735
736 00000101: Means both DI1 and DI2 trigger are enabled.
737
738
739 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
740
741 Downlink command to poll MOD6 status:
742
743 **AB 06**
744
745 When device got this command, it will send the MOD6 payload.
746
747
748
749 === 3.3.7 Payload Decoder ===
750
751 (((
752
753
754 **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/]]
755
756
757 )))
758
759
760 == 3.4 ​Configure LT via AT or Downlink ==
761
762 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
763
764 (((
765 There are two kinds of Commands:
766 )))
767
768 * (% 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]]
769
770 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
771
772 === 3.4.1 Common Commands ===
773
774 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]]
775
776
777
778 === 3.4.2 Sensor related commands ===
779
780 ==== 3.4.2.1 Set Transmit Interval ====
781
782 Set device uplink interval.
783
784 * AT Command:
785
786 (% class="box infomessage" %)
787 (((
788 **AT+TDC=N **
789 )))
790
791 **Example: **AT+TDC=30000. Means set interval to 30 seconds
792
793
794 * Downlink Payload (prefix 0x01):
795
796 (% class="box infomessage" %)
797 (((
798 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
799 )))
800
801
802
803 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
804
805 Set work mode.
806
807 * AT Command:
808
809 (% class="box infomessage" %)
810 (((
811 **AT+MOD=N  **
812 )))
813
814 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
815
816
817 * Downlink Payload (prefix 0x0A):
818
819 (% class="box infomessage" %)
820 (((
821 **0x0A aa     ~/~/ Same as AT+MOD=aa**
822 )))
823
824
825
826 ==== 3.4.2.3 Poll an uplink ====
827
828 * AT Command:
829
830 There is no AT Command to poll uplink
831
832
833 * Downlink Payload (prefix 0x08):
834
835 (% class="box infomessage" %)
836 (((
837 **0x08 FF     ~/~/ Poll an uplink,**
838 )))
839
840 **Example**: 0x08FF, ask device to send an Uplink
841
842
843
844 ==== 3.4.2.4 Enable Trigger Mode ====
845
846 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
847
848 * AT Command:
849
850 (% class="box infomessage" %)
851 (((
852 **AT+ADDMOD6=1 or 0**
853 )))
854
855 1: Enable Trigger Mode
856
857 0: Disable Trigger Mode
858
859
860 * Downlink Payload (prefix 0x0A 06):
861
862 (% class="box infomessage" %)
863 (((
864 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
865 )))
866
867
868
869 ==== 3.4.2.5 Poll trigger settings ====
870
871 Poll trigger settings,
872
873 * AT Command:
874
875 There is no AT Command for this feature.
876
877
878 * Downlink Payload (prefix 0x AB 06):
879
880 (% class="box infomessage" %)
881 (((
882 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
883 )))
884
885
886
887 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
888
889 Enable Disable DI1/DI2/DI2 as trigger,
890
891 * AT Command:
892
893 (% class="box infomessage" %)
894 (((
895 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
896 )))
897
898
899 **Example:**
900
901 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
902
903 * Downlink Payload (prefix 0xAA 02):
904
905 (% class="box infomessage" %)
906 (((
907 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
908 )))
909
910
911
912 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
913
914 Set DI1 or DI3(for LT-33222-L) trigger.
915
916 * AT Command:
917
918 (% class="box infomessage" %)
919 (((
920 **AT+TRIG1=a,b**
921 )))
922
923 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
924
925 b : delay timing.
926
927
928 **Example:**
929
930 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
931
932
933 * Downlink Payload (prefix 0x09 01 ):
934
935 (% class="box infomessage" %)
936 (((
937 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
938 )))
939
940
941
942 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
943
944 Set DI2 trigger.
945
946 * AT Command:
947
948 (% class="box infomessage" %)
949 (((
950 **AT+TRIG2=a,b**
951 )))
952
953 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
954
955 b : delay timing.
956
957
958 **Example:**
959
960 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
961
962
963 * Downlink Payload (prefix 0x09 02 ):
964
965 (% class="box infomessage" %)
966 (((
967 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
968 )))
969
970
971
972 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
973
974 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
975
976 * AT Command:
977
978 (% class="box infomessage" %)
979 (((
980 **AT+ACLIM. **
981 )))
982
983
984 * Downlink Payload (prefix 0xAA 01 ):
985
986 (% class="box infomessage" %)
987 (((
988 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
989 )))
990
991
992
993 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
994
995 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
996
997 * AT Command:
998
999 (% class="box infomessage" %)
1000 (((
1001 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
1002 )))
1003
1004
1005 * Downlink Payload (prefix 0xAA 00 ):
1006
1007 (% class="box infomessage" %)
1008 (((
1009 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
1010 )))
1011
1012
1013
1014 ==== 3.4.2.11 Trigger – Set minimum interval ====
1015
1016 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
1017
1018 * AT Command:
1019
1020 (% class="box infomessage" %)
1021 (((
1022 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
1023 )))
1024
1025
1026 * Downlink Payload (prefix 0xAC ):
1027
1028 (% class="box infomessage" %)
1029 (((
1030 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
1031 )))
1032
1033
1034
1035 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1036
1037 * AT Command:
1038
1039 There is no AT Command to control Digital Output
1040
1041
1042 * Downlink Payload (prefix 0x02):
1043
1044 (% class="box infomessage" %)
1045 (((
1046 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1047 )))
1048
1049 (((
1050 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1051 )))
1052
1053 (((
1054 01: Low,  00: High ,  11: No action
1055 )))
1056
1057 [[image:image-20220524092754-5.png]]
1058
1059 (((
1060 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1061 )))
1062
1063 (((
1064 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1065 )))
1066
1067
1068
1069 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1070
1071 * AT Command:
1072
1073 There is no AT Command to control Digital Output
1074
1075
1076 * Downlink Payload (prefix 0xA9):
1077
1078 (% class="box infomessage" %)
1079 (((
1080 (((
1081 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1082 )))
1083 )))
1084
1085 This is to control the digital output time of DO pin. Include four bytes:
1086
1087 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1088
1089 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1090
1091 01: DO pins will change back to original state after timeout.
1092
1093 00: DO pins will change to an inverter state after timeout 
1094
1095
1096 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1097
1098 [[image:image-20220524093238-6.png]]
1099
1100
1101 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1102
1103 [[image:image-20220524093328-7.png]]
1104
1105
1106 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1107
1108 [[image:image-20220524093351-8.png]]
1109
1110
1111 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1112
1113 Latching time. Unit: ms
1114
1115 Device will upload a packet if downlink code executes successfully.
1116
1117
1118 **Example payload:**
1119
1120 **~1. A9 01 01 01 01 07 D0**
1121
1122 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1123
1124 **2. A9 01 00 01 11 07 D0**
1125
1126 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1127
1128 **3. A9 00 00 00 00 07 D0**
1129
1130 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1131
1132 **4. A9 00 11 01 00 07 D0**
1133
1134 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
1135
1136
1137
1138 ==== 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ====
1139
1140 * AT Command:
1141
1142 There is no AT Command to control Relay Output
1143
1144
1145 * Downlink Payload (prefix 0x03):
1146
1147 (% class="box infomessage" %)
1148 (((
1149 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1150 )))
1151
1152 (((
1153 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1154 )))
1155
1156 (((
1157 01: Close ,  00: Open , 11: No action
1158 )))
1159
1160 (((
1161 [[image:image-20220524093724-9.png]]
1162 )))
1163
1164 Device will upload a packet if downlink code executes successfully.
1165
1166
1167
1168 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1169
1170 * AT Command:
1171
1172 There is no AT Command to control Relay Output
1173
1174
1175 * Downlink Payload (prefix 0x05):
1176
1177 (% class="box infomessage" %)
1178 (((
1179 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1180 )))
1181
1182 This is to control the relay output time of relay. Include four bytes:
1183
1184 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1185
1186 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1187
1188 01: Relays will change back to original state after timeout.
1189
1190 00: Relays will change to an inverter state after timeout
1191
1192
1193 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1194
1195 [[image:image-20220524093831-10.png]]
1196
1197
1198 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1199
1200 Device will upload a packet if downlink code executes successfully.
1201
1202
1203 **Example payload:**
1204
1205 **~1. 05 01 11 07 D0**
1206
1207 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1208
1209 **2. 05 01 10 07 D0**
1210
1211 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1212
1213 **3. 05 00 01 07 D0**
1214
1215 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1216
1217 **4. 05 00 00 07 D0**
1218
1219 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1220
1221
1222
1223 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1224
1225 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1226
1227 * AT Command:
1228
1229 (% class="box infomessage" %)
1230 (((
1231 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1232 )))
1233
1234
1235 * Downlink Payload (prefix 0xA5):
1236
1237 (% class="box infomessage" %)
1238 (((
1239 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1240 )))
1241
1242
1243
1244 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1245
1246 * AT Command:
1247
1248 (% class="box infomessage" %)
1249 (((
1250 **AT+SETCNT=aa,(bb cc dd ee) **
1251 )))
1252
1253 aa: 1: Set count1,
1254
1255 2: Set count2,
1256
1257 3: Set AV1 count
1258
1259 Bb cc dd ee: number to be set
1260
1261
1262 * Downlink Payload (prefix 0xA8):
1263
1264 (% class="box infomessage" %)
1265 (((
1266 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1267 )))
1268
1269
1270
1271 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1272
1273 Clear counting for counting mode
1274
1275 * AT Command:
1276
1277 (% class="box infomessage" %)
1278 (((
1279 **AT+CLRCOUNT ~/~/ clear all counting**
1280 )))
1281
1282 * Downlink Payload (prefix 0xA6):
1283
1284 (% class="box infomessage" %)
1285 (((
1286 **0x A6 01     ~/~/ clear all counting,**
1287 )))
1288
1289
1290
1291 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1292
1293 * AT Command:
1294
1295 (% class="box infomessage" %)
1296 (((
1297 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1298 )))
1299
1300 * Downlink Payload (prefix 0xA7):
1301
1302 (% class="box infomessage" %)
1303 (((
1304 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1305 )))
1306
1307 (((
1308 range: aa bb cc:0 to 16777215,  (unit:second)
1309
1310
1311 )))
1312
1313
1314 == 3.5 Integrate with Mydevice ==
1315
1316 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:
1317
1318 (((
1319 (% style="color:blue" %)**Step 1**(%%): Be sure that your device is programmed and properly connected to the network at this time.
1320 )))
1321
1322 (((
1323 (% 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:
1324 )))
1325
1326 [[image:1653356737703-362.png||height="232" width="732"]]
1327
1328 [[image:image-20220524094641-11.png||height="390" width="723"]]
1329
1330
1331 [[image:image-20220524094641-12.png||height="402" width="718"]]
1332
1333
1334 (% style="color:blue" %)**Step 3**(%%): Create an account or log in Mydevices.
1335
1336 (% style="color:blue" %)**Step 4**(%%): Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1337
1338 Search under The things network
1339
1340 [[image:1653356838789-523.png||height="337" width="740"]]
1341
1342
1343
1344 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1345
1346 [[image:image-20220524094909-1.png||height="335" width="729"]]
1347
1348
1349 [[image:image-20220524094909-2.png||height="337" width="729"]]
1350
1351
1352 [[image:image-20220524094909-3.png||height="338" width="727"]]
1353
1354
1355 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1356
1357
1358 [[image:image-20220524094909-5.png||height="341" width="734"]]
1359
1360
1361
1362 == 3.6 Interface Detail ==
1363
1364 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1365
1366 Support NPN Type sensor
1367
1368 [[image:1653356991268-289.png]]
1369
1370
1371
1372 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1373
1374 (((
1375 The DI port of LT-22222-L can support NPN or PNP output sensor.
1376 )))
1377
1378 (((
1379 (((
1380 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
1381 )))
1382 )))
1383
1384 [[image:1653357170703-587.png]]
1385
1386 (((
1387 (((
1388 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1389 )))
1390 )))
1391
1392 (((
1393
1394 )))
1395
1396 (((
1397 (% style="color:blue" %)**Example1**(%%): Connect to a Low active sensor.
1398 )))
1399
1400 (((
1401 This type of sensor will output a low signal GND when active.
1402 )))
1403
1404 * (((
1405 Connect sensor’s output to DI1-
1406 )))
1407 * (((
1408 Connect sensor’s VCC to DI1+.
1409 )))
1410
1411 (((
1412 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1413 )))
1414
1415 (((
1416 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1417 )))
1418
1419 (((
1420 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.
1421 )))
1422
1423 (((
1424
1425 )))
1426
1427 (((
1428 (% style="color:blue" %)**Example2**(%%): Connect to a High active sensor.
1429 )))
1430
1431 (((
1432 This type of sensor will output a high signal (example 24v) when active.
1433 )))
1434
1435 * (((
1436 Connect sensor’s output to DI1+
1437 )))
1438 * (((
1439 Connect sensor’s GND DI1-.
1440 )))
1441
1442 (((
1443 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1444 )))
1445
1446 (((
1447 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1448 )))
1449
1450 (((
1451 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.
1452 )))
1453
1454 (((
1455
1456 )))
1457
1458 (((
1459 (% style="color:blue" %)**Example3**(%%): Connect to a 220v high active sensor.
1460 )))
1461
1462 (((
1463 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1464 )))
1465
1466 * (((
1467 Connect sensor’s output to DI1+ with a serial 50K resistor
1468 )))
1469 * (((
1470 Connect sensor’s GND DI1-.
1471 )))
1472
1473 (((
1474 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1475 )))
1476
1477 (((
1478 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1479 )))
1480
1481 (((
1482 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.
1483 )))
1484
1485
1486
1487 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1488
1489 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1490
1491 [[image:1653357531600-905.png]]
1492
1493
1494
1495 === 3.6.4 Analog Input Interface ===
1496
1497 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:
1498
1499
1500 (% style="color:blue" %)**AC2 = (IN2 voltage )/12**
1501
1502 [[image:1653357592296-182.png]]
1503
1504 Example to connect a 4~~20mA sensor
1505
1506 We take the wind speed sensor as an example for reference only.
1507
1508
1509 **Specifications of the wind speed sensor:**
1510
1511 Red:  12~~24v
1512
1513 Yellow:  4~~20mA
1514
1515 Black:  GND
1516
1517
1518 **Connection diagram:**
1519
1520 [[image:1653357640609-758.png]]
1521
1522 [[image:1653357648330-671.png||height="155" width="733"]]
1523
1524
1525
1526 === 3.6.5 Relay Output ===
1527
1528 (((
1529 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:
1530 )))
1531
1532 [[image:image-20220524100215-9.png]]
1533
1534 [[image:image-20220524100215-10.png||height="382" width="723"]]
1535
1536
1537
1538 == 3.7 LEDs Indicators ==
1539
1540 [[image:image-20220524100748-11.png]]
1541
1542
1543 = 4. Use AT Command =
1544
1545 == 4.1 Access AT Command ==
1546
1547 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.
1548
1549 [[image:1653358238933-385.png]]
1550
1551
1552 (((
1553 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:
1554 )))
1555
1556 [[image:1653358355238-883.png]]
1557
1558
1559 (((
1560 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/]]
1561 )))
1562
1563 (((
1564 AT+<CMD>?        : Help on <CMD>
1565 )))
1566
1567 (((
1568 AT+<CMD>         : Run <CMD>
1569 )))
1570
1571 (((
1572 AT+<CMD>=<value> : Set the value
1573 )))
1574
1575 (((
1576 AT+<CMD>=?       : Get the value
1577 )))
1578
1579 (((
1580 ATZ: Trig a reset of the MCU
1581 )))
1582
1583 (((
1584 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1585 )))
1586
1587 (((
1588 AT+DEUI: Get or Set the Device EUI
1589 )))
1590
1591 (((
1592 AT+DADDR: Get or Set the Device Address
1593 )))
1594
1595 (((
1596 AT+APPKEY: Get or Set the Application Key
1597 )))
1598
1599 (((
1600 AT+NWKSKEY: Get or Set the Network Session Key
1601 )))
1602
1603 (((
1604 AT+APPSKEY: Get or Set the Application Session Key
1605 )))
1606
1607 (((
1608 AT+APPEUI: Get or Set the Application EUI
1609 )))
1610
1611 (((
1612 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1613 )))
1614
1615 (((
1616 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1617 )))
1618
1619 (((
1620 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1621 )))
1622
1623 (((
1624 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1625 )))
1626
1627 (((
1628 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1629 )))
1630
1631 (((
1632 AT+RX2FQ: Get or Set the Rx2 window frequency
1633 )))
1634
1635 (((
1636 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1637 )))
1638
1639 (((
1640 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1641 )))
1642
1643 (((
1644 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1645 )))
1646
1647 (((
1648 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1649 )))
1650
1651 (((
1652 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1653 )))
1654
1655 (((
1656 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1657 )))
1658
1659 (((
1660 AT+NWKID: Get or Set the Network ID
1661 )))
1662
1663 (((
1664 AT+FCU: Get or Set the Frame Counter Uplink
1665 )))
1666
1667 (((
1668 AT+FCD: Get or Set the Frame Counter Downlink
1669 )))
1670
1671 (((
1672 AT+CLASS: Get or Set the Device Class
1673 )))
1674
1675 (((
1676 AT+JOIN: Join network
1677 )))
1678
1679 (((
1680 AT+NJS: Get OTAA Join Status
1681 )))
1682
1683 (((
1684 AT+SENDB: Send hexadecimal data along with the application port
1685 )))
1686
1687 (((
1688 AT+SEND: Send text data along with the application port
1689 )))
1690
1691 (((
1692 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1693 )))
1694
1695 (((
1696 AT+RECV: Print last received data in raw format
1697 )))
1698
1699 (((
1700 AT+VER: Get current image version and Frequency Band
1701 )))
1702
1703 (((
1704 AT+CFM: Get or Set the confirmation mode (0-1)
1705 )))
1706
1707 (((
1708 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1709 )))
1710
1711 (((
1712 AT+SNR: Get the SNR of the last received packet
1713 )))
1714
1715 (((
1716 AT+RSSI: Get the RSSI of the last received packet
1717 )))
1718
1719 (((
1720 AT+TDC: Get or set the application data transmission interval in ms
1721 )))
1722
1723 (((
1724 AT+PORT: Get or set the application port
1725 )))
1726
1727 (((
1728 AT+DISAT: Disable AT commands
1729 )))
1730
1731 (((
1732 AT+PWORD: Set password, max 9 digits
1733 )))
1734
1735 (((
1736 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1737 )))
1738
1739 (((
1740 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1741 )))
1742
1743 (((
1744 AT+CFG: Print all settings
1745
1746
1747 )))
1748
1749
1750
1751 == 4.2 Common AT Command Sequence ==
1752
1753 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1754
1755 (((
1756
1757
1758 **If device has not joined network yet:**
1759 )))
1760
1761 (((
1762 (% style="background-color:#dcdcdc" %)123456
1763 )))
1764
1765 (((
1766 (% style="background-color:#dcdcdc" %)AT+FDR
1767 )))
1768
1769 (((
1770 (% style="background-color:#dcdcdc" %)123456
1771 )))
1772
1773 (((
1774 (% style="background-color:#dcdcdc" %)AT+NJM=0
1775 )))
1776
1777 (((
1778 (% style="background-color:#dcdcdc" %)ATZ
1779 )))
1780
1781
1782 (((
1783 **If device already joined network:**
1784 )))
1785
1786 (((
1787 (% style="background-color:#dcdcdc" %)AT+NJM=0
1788 )))
1789
1790 (((
1791 (% style="background-color:#dcdcdc" %)ATZ
1792
1793
1794 )))
1795
1796
1797
1798 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1799
1800 (((
1801
1802
1803 (% style="background-color:#dcdcdc" %)123456(%%)  Enter Password to have AT access.
1804 )))
1805
1806 (((
1807 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1808 )))
1809
1810 (((
1811 (% style="background-color:#dcdcdc" %) 123456(%%)  Enter Password to have AT access.
1812 )))
1813
1814 (((
1815 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1816 )))
1817
1818 (((
1819 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%)  Set to ABP mode
1820 )))
1821
1822 (((
1823 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%)  Set the Adaptive Data Rate Off
1824 )))
1825
1826 (((
1827 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1828 )))
1829
1830 (((
1831 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1832 )))
1833
1834 (((
1835 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1836 )))
1837
1838 (((
1839 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%)  Set RX2Frequency to 868.4Mhz (according to the result from server)
1840 )))
1841
1842 (((
1843 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1844 )))
1845
1846 (((
1847 (% 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.
1848 )))
1849
1850 (((
1851 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1852
1853
1854 )))
1855
1856 (((
1857 (% style="color:red" %)**Note:**
1858 )))
1859
1860 (((
1861 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1862 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1863 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.
1864 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
1865 )))
1866
1867 (((
1868 [[image:1653359097980-169.png||height="188" width="729"]]
1869 )))
1870
1871 (((
1872
1873 )))
1874
1875
1876 === 4.2.3 Change to Class A ===
1877
1878 If sensor JOINED
1879 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1880 ATZ
1881
1882
1883 = 5. FAQ =
1884
1885 == 5.1 How to upgrade the image? ==
1886
1887
1888 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1889
1890 * Support new features
1891 * For bug fix
1892 * Change LoRaWAN bands.
1893
1894 Below shows the hardware connection for how to upload an image to the LT:
1895
1896 [[image:1653359603330-121.png]]
1897
1898
1899 (((
1900 (% 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]].
1901 (% 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/]].
1902 (% style="color:blue" %)**Step3**(%%)**:** Open flashloader; choose the correct COM port to update.
1903
1904
1905 (% style="color:blue" %)**For LT-22222-L**(%%):
1906 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.
1907 )))
1908
1909 [[image:image-20220524103407-12.png]]
1910
1911 [[image:image-20220524103429-13.png]]
1912
1913 [[image:image-20220524104033-15.png]]
1914
1915
1916 (% 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:
1917
1918 [[image:1653360054704-518.png||height="186" width="745"]]
1919
1920
1921 (((
1922 (((
1923
1924
1925 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1926 )))
1927 )))
1928
1929 (((
1930 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1931 )))
1932
1933 (((
1934
1935
1936 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1937 )))
1938
1939 (((
1940 (((
1941 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1942 )))
1943 )))
1944
1945 (((
1946 (((
1947 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1948
1949
1950 )))
1951 )))
1952
1953 (((
1954 (% 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.
1955 )))
1956
1957 (((
1958 [[image:1653360231087-571.png||height="401" width="727"]]
1959 )))
1960
1961 (((
1962 (% 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.
1963 )))
1964
1965
1966 (((
1967 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1968 )))
1969
1970 (((
1971 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1972 (% style="background-color:#dcdcdc" %)AT+FDR(%%)  Reset Parameters to Factory Default, Keys Reserve
1973 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1974 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%) Set to ABP mode
1975 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%) Set the Adaptive Data Rate Off
1976 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1977 (% style="background-color:#dcdcdc" %)AT+TDC=60000 (%%) Set transmit interval to 60 seconds
1978 (% style="background-color:#dcdcdc" %)AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1979 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%)  Set Device Address to 26 01 1A F1
1980 (% style="background-color:#dcdcdc" %)ATZ        (%%) Reset MCU
1981 )))
1982
1983
1984 (((
1985 As shown in below:
1986 )))
1987
1988 [[image:1653360498588-932.png||height="485" width="726"]]
1989
1990
1991 == 5.4 Can I see counting event in Serial? ==
1992
1993 (((
1994 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.
1995
1996
1997 == 5.5 Can i use point to point communication for LT-22222-L? ==
1998
1999 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
2000 )))
2001
2002 (((
2003 == 5.6 Why does the relay output become the default and open relay after the lt22222 is powered off? ==
2004
2005 If the device is not shut down, but directly powered off.
2006
2007 It will default that this is a power-off state.
2008
2009 In modes 2 to 5, DO RO status and pulse count are saved in flash.
2010
2011 After restart, the status before power failure will be read from flash.
2012
2013 = 6. Trouble Shooting =
2014 )))
2015
2016 (((
2017 (((
2018 == 6.1 Downlink doesn’t work, how to solve it? ==
2019 )))
2020 )))
2021
2022 (((
2023 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
2024 )))
2025
2026 (((
2027
2028
2029 == 6.2 Have trouble to upload image. ==
2030 )))
2031
2032 (((
2033 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
2034 )))
2035
2036 (((
2037
2038
2039 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
2040 )))
2041
2042 (((
2043 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
2044 )))
2045
2046
2047
2048 = 7. Order Info =
2049
2050
2051 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
2052
2053
2054 (% style="color:#4f81bd" %)**XXX:**
2055
2056 * (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
2057 * (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
2058 * (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
2059 * (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
2060 * (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
2061 * (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
2062 * (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2063 * (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2064 * (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2065
2066 = 8. Packing Info =
2067
2068
2069 **Package Includes**:
2070
2071 * LT-22222-L I/O Controller x 1
2072 * Stick Antenna for LoRa RF part x 1
2073 * Bracket for controller x1
2074 * Program cable x 1
2075
2076 **Dimension and weight**:
2077
2078 * Device Size: 13.5 x 7 x 3 cm
2079 * Device Weight: 105g
2080 * Package Size / pcs : 14.5 x 8 x 5 cm
2081 * Weight / pcs : 170g
2082
2083 = 9. Support =
2084
2085 * (((
2086 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.
2087 )))
2088 * (((
2089 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]]
2090 )))
2091
2092 = 10. Reference​​​​​ =
2093
2094 * 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]]
2095 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2096 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2097 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]