Skip to Content
Version 77.99 by Xiaoling on 2022/06/10 09:32
Show last authors
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 **Interface for Model: LT22222-L:**
80 )))
81
82 * (((
83 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
84 )))
85 * (((
86 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
87 )))
88 * (((
89 2 x Relay Output (5A@250VAC / 30VDC)
90 )))
91 * (((
92 2 x 0~~20mA Analog Input (res:0.01mA)
93 )))
94 * (((
95 2 x 0~~30V Analog Input (res:0.01v)
96 )))
97 * (((
98 Power Input 7~~ 24V DC. 
99 )))
100
101 (((
102 **LoRa Spec:**
103 )))
104
105 * (((
106 (((
107 Frequency Range:
108 )))
109
110 * (((
111 Band 1 (HF): 862 ~~ 1020 Mhz
112 )))
113 * (((
114 Band 2 (LF): 410 ~~ 528 Mhz
115 )))
116 )))
117 * (((
118 168 dB maximum link budget.
119 )))
120 * (((
121 +20 dBm - 100 mW constant RF output vs.
122 )))
123 * (((
124 +14 dBm high efficiency PA.
125 )))
126 * (((
127 Programmable bit rate up to 300 kbps.
128 )))
129 * (((
130 High sensitivity: down to -148 dBm.
131 )))
132 * (((
133 Bullet-proof front end: IIP3 = -12.5 dBm.
134 )))
135 * (((
136 Excellent blocking immunity.
137 )))
138 * (((
139 Low RX current of 10.3 mA, 200 nA register retention.
140 )))
141 * (((
142 Fully integrated synthesizer with a resolution of 61 Hz.
143 )))
144 * (((
145 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
146 )))
147 * (((
148 Built-in bit synchronizer for clock recovery.
149 )))
150 * (((
151 Preamble detection.
152 )))
153 * (((
154 127 dB Dynamic Range RSSI.
155 )))
156 * (((
157 Automatic RF Sense and CAD with ultra-fast AFC.
158 )))
159 * (((
160 Packet engine up to 256 bytes with CRC.
161
162
163 )))
164
165 == 1.3 Features ==
166
167 * LoRaWAN Class A & Class C protocol
168 * Optional Customized LoRa Protocol
169 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
170 * AT Commands to change parameters
171 * Remote configure parameters via LoRa Downlink
172 * Firmware upgradable via program port
173 * Counting
174
175 == 1.4  Applications ==
176
177 * Smart Buildings & Home Automation
178 * Logistics and Supply Chain Management
179 * Smart Metering
180 * Smart Agriculture
181 * Smart Cities
182 * Smart Factory
183
184 == 1.5 Hardware Variants ==
185
186 (% border="1" style="background-color:#f7faff; width:500px" %)
187 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
188 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
189 * 2 x Digital Input (Bi-direction)
190 * 2 x Digital Output
191 * 2 x Relay Output (5A@250VAC / 30VDC)
192 * 2 x 0~~20mA Analog Input (res:0.01mA)
193 * 2 x 0~~30V Analog Input (res:0.01v)
194 * 1 x Counting Port
195 )))
196
197 = 2. Power ON Device =
198
199 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.
200
201 (((
202 PWR will on when device is properly powered.
203 )))
204
205 [[image:1653297104069-180.png]]
206
207
208
209 = 3. Operation Mode =
210
211 == 3.1 How it works? ==
212
213 (((
214 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. 
215 )))
216
217 (((
218 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.
219
220
221 )))
222
223
224
225 == 3.2 Example to join LoRaWAN network ==
226
227 (((
228 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. 
229 )))
230
231 [[image:image-20220523172350-1.png||height="266" width="864"]]
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 **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 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
248
249 Add APP EUI in the application.
250
251 [[image:1653297955910-247.png||height="321" width="716"]]
252
253
254 Add APP KEY and DEV EUI
255
256 [[image:1653298023685-319.png]]
257
258
259 (((
260 **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.
261 )))
262
263 [[image:1653298044601-602.png||height="405" width="709"]]
264
265
266
267 == 3.3 Uplink Payload ==
268
269 There are five working modes + one interrupt mode on LT for different type application:
270
271 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
272 * **MOD2**: Double DI Counting + DO + RO
273 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
274 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
275 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
276 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
277
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
337 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
338
339
340 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
341
342 (((
343 Total : 11 bytes payload
344 )))
345
346 [[image:image-20220523180452-3.png]]
347
348
349 (((
350 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
351 )))
352
353 [[image:image-20220523180506-4.png]]
354
355 * RO is for relay. ROx=1 : close，ROx=0 always open.
356 * FIRST: Indicate this is the first packet after join network.
357 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
358
359 (((
360 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
361 )))
362
363 (((
364
365
366 **To use counting mode, please run:**
367 )))
368
369 (% class="box infomessage" %)
370 (((
371 (((
372 **AT+MOD=2**
373 )))
374 )))
375
376 (% class="box infomessage" %)
377 (((
378 (((
379 **ATZ**
380 )))
381 )))
382
383 (((
384
385
386 (% style="color:#4f81bd" %)**AT Commands for counting:**
387 )))
388
389 (((
390 **For LT22222-L:**
391 )))
392
393 (% class="box infomessage" %)
394 (((
395 (((
396 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
397 )))
398 )))
399
400 (% class="box infomessage" %)
401 (((
402 (((
403 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
404 )))
405 )))
406
407 (% class="box infomessage" %)
408 (((
409 (((
410 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
411 )))
412 )))
413
414 (% class="box infomessage" %)
415 (((
416 (((
417 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
418 )))
419 )))
420
421 (% class="box infomessage" %)
422 (((
423 (((
424 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
425 )))
426 )))
427
428 (% class="box infomessage" %)
429 (((
430 (((
431 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
432 )))
433 )))
434
435
436
437 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
438
439 **LT22222-L**: This mode the DI1 is used as a counting pin.
440
441 [[image:image-20220523181246-5.png]]
442
443 (((
444 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
445 )))
446
447 [[image:image-20220523181301-6.png]]
448
449 * RO is for relay. ROx=1 : close，ROx=0 always open.
450 * FIRST: Indicate this is the first packet after join network.
451 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
452
453 (((
454 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
455 )))
456
457 (((
458 **To use counting mode, please run:**
459 )))
460
461 (% class="box infomessage" %)
462 (((
463 (((
464 **AT+MOD=3**
465 )))
466 )))
467
468 (% class="box infomessage" %)
469 (((
470 (((
471 **ATZ**
472 )))
473 )))
474
475 (((
476 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
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
630 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
631
632 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
633 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.**
634
635
636
637 **AT Command to set Trigger Condition**:
638
639 (% style="color:#4f81bd" %)**Trigger base on voltage**:
640
641 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
642
643 **Example:**
644
645 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)
646
647 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
648
649
650
651 (% style="color:#4f81bd" %)**Trigger base on current**:
652
653 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
654
655 **Example:**
656
657 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
658
659
660
661 (% style="color:#4f81bd" %)**Trigger base on DI status**:
662
663 DI status trigger Flag.
664
665 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
666
667
668 **Example:**
669
670 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
671
672
673 **Downlink Command to set Trigger Condition:**
674
675 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
676
677 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
678
679 AA: Code for this downlink Command:
680
681 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
682
683 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
684
685 yy2 yy2: AC1 or AV1 high limit.
686
687 yy3 yy3: AC2 or AV2 low limit.
688
689 Yy4 yy4: AC2 or AV2 high limit.
690
691
692 **Example1**: AA 00 13 88 00 00 00 00 00 00
693
694 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
695
696
697 **Example2**: AA 02 01 00
698
699 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
700
701
702
703 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
704
705 MOD6 Payload : total 11 bytes payload
706
707 [[image:image-20220524085923-1.png]]
708
709
710 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
711
712 [[image:image-20220524090106-2.png]]
713
714 * Each bits shows if the corresponding trigger has been configured.
715
716
717
718 **Example:**
719
720 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
721
722
723 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
724
725 [[image:image-20220524090249-3.png]]
726
727 * Each bits shows which status has been trigger on this uplink.
728
729
730
731 **Example:**
732
733 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
734
735
736 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
737
738 [[image:image-20220524090456-4.png]]
739
740 * Each bits shows which status has been trigger on this uplink.
741
742
743
744 **Example:**
745
746 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
747
748 00000101: Means both DI1 and DI2 trigger are enabled.
749
750
751 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
752
753 Downlink command to poll MOD6 status:
754
755 **AB 06**
756
757 When device got this command, it will send the MOD6 payload.
758
759
760
761 === 3.3.7 Payload Decoder ===
762
763 (((
764
765
766 **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/]]
767
768
769 )))
770
771
772
773 == 3.4 ​Configure LT via AT or Downlink ==
774
775 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
776
777 (((
778 There are two kinds of Commands:
779 )))
780
781 * (% 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]]
782
783 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
784
785
786
787 === 3.4.1 Common Commands ===
788
789 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]]
790
791
792
793 === 3.4.2 Sensor related commands ===
794
795 ==== 3.4.2.1 Set Transmit Interval ====
796
797 Set device uplink interval.
798
799 * AT Command:
800
801 (% class="box infomessage" %)
802 (((
803 **AT+TDC=N **
804 )))
805
806 **Example: **AT+TDC=30000. Means set interval to 30 seconds
807
808
809 * Downlink Payload (prefix 0x01):
810
811 (% class="box infomessage" %)
812 (((
813 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
814 )))
815
816
817
818 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
819
820 Set work mode.
821
822 * AT Command:
823
824 (% class="box infomessage" %)
825 (((
826 **AT+MOD=N  **
827 )))
828
829 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
830
831
832 * Downlink Payload (prefix 0x0A):
833
834 (% class="box infomessage" %)
835 (((
836 **0x0A aa     ~/~/ Same as AT+MOD=aa**
837 )))
838
839
840
841 ==== 3.4.2.3 Poll an uplink ====
842
843 * AT Command:
844
845 There is no AT Command to poll uplink
846
847
848 * Downlink Payload (prefix 0x08):
849
850 (% class="box infomessage" %)
851 (((
852 **0x08 FF     ~/~/ Poll an uplink,**
853 )))
854
855 **Example**: 0x08FF, ask device to send an Uplink
856
857
858
859 ==== 3.4.2.4 Enable Trigger Mode ====
860
861 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
862
863 * AT Command:
864
865 (% class="box infomessage" %)
866 (((
867 **AT+ADDMOD6=1 or 0**
868 )))
869
870 1: Enable Trigger Mode
871
872 0: Disable Trigger Mode
873
874
875 * Downlink Payload (prefix 0x0A 06):
876
877 (% class="box infomessage" %)
878 (((
879 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
880 )))
881
882
883
884 ==== 3.4.2.5 Poll trigger settings ====
885
886 Poll trigger settings,
887
888 * AT Command:
889
890 There is no AT Command for this feature.
891
892
893 * Downlink Payload (prefix 0x AB 06):
894
895 (% class="box infomessage" %)
896 (((
897 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
898 )))
899
900
901
902 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
903
904 Enable Disable DI1/DI2/DI2 as trigger,
905
906 * AT Command:
907
908 (% class="box infomessage" %)
909 (((
910 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
911 )))
912
913
914 **Example:**
915
916 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
917
918 * Downlink Payload (prefix 0xAA 02):
919
920 (% class="box infomessage" %)
921 (((
922 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
923 )))
924
925
926
927 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
928
929 Set DI1 or DI3(for LT-33222-L) trigger.
930
931 * AT Command:
932
933 (% class="box infomessage" %)
934 (((
935 **AT+TRIG1=a,b**
936 )))
937
938 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
939
940 b : delay timing.
941
942
943 **Example:**
944
945 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
946
947
948 * Downlink Payload (prefix 0x09 01 ):
949
950 (% class="box infomessage" %)
951 (((
952 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
953 )))
954
955
956
957 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
958
959 Set DI2 trigger.
960
961 * AT Command:
962
963 (% class="box infomessage" %)
964 (((
965 **AT+TRIG2=a,b**
966 )))
967
968 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
969
970 b : delay timing.
971
972
973 **Example:**
974
975 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
976
977
978 * Downlink Payload (prefix 0x09 02 ):
979
980 (% class="box infomessage" %)
981 (((
982 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
983 )))
984
985
986
987 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
988
989 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
990
991 * AT Command:
992
993 (% class="box infomessage" %)
994 (((
995 **AT+ACLIM. **
996 )))
997
998
999 * Downlink Payload (prefix 0xAA 01 ):
1000
1001 (% class="box infomessage" %)
1002 (((
1003 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
1004 )))
1005
1006
1007
1008 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
1009
1010 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
1011
1012 * AT Command:
1013
1014 (% class="box infomessage" %)
1015 (((
1016 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
1017 )))
1018
1019
1020 * Downlink Payload (prefix 0xAA 00 ):
1021
1022 (% class="box infomessage" %)
1023 (((
1024 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
1025 )))
1026
1027
1028
1029 ==== 3.4.2.11 Trigger – Set minimum interval ====
1030
1031 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
1032
1033 * AT Command:
1034
1035 (% class="box infomessage" %)
1036 (((
1037 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
1038 )))
1039
1040
1041 * Downlink Payload (prefix 0xAC ):
1042
1043 (% class="box infomessage" %)
1044 (((
1045 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
1046 )))
1047
1048
1049
1050 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1051
1052 * AT Command:
1053
1054 There is no AT Command to control Digital Output
1055
1056
1057 * Downlink Payload (prefix 0x02):
1058
1059 (% class="box infomessage" %)
1060 (((
1061 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1062 )))
1063
1064 (((
1065 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1066 )))
1067
1068 (((
1069 01: Low,  00: High ,  11: No action
1070 )))
1071
1072 [[image:image-20220524092754-5.png]]
1073
1074 (((
1075 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1076 )))
1077
1078 (((
1079 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1080 )))
1081
1082
1083
1084 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1085
1086 * AT Command:
1087
1088 There is no AT Command to control Digital Output
1089
1090
1091 * Downlink Payload (prefix 0xA9):
1092
1093 (% class="box infomessage" %)
1094 (((
1095 (((
1096 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1097 )))
1098 )))
1099
1100 This is to control the digital output time of DO pin. Include four bytes:
1101
1102 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1103
1104 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1105
1106 01: DO pins will change back to original state after timeout.
1107
1108 00: DO pins will change to an inverter state after timeout 
1109
1110
1111 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1112
1113 [[image:image-20220524093238-6.png]]
1114
1115
1116 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1117
1118 [[image:image-20220524093328-7.png]]
1119
1120
1121 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1122
1123 [[image:image-20220524093351-8.png]]
1124
1125
1126 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1127
1128 Latching time. Unit: ms
1129
1130 Device will upload a packet if downlink code executes successfully.
1131
1132
1133 **Example payload:**
1134
1135 **~1. A9 01 01 01 01 07 D0**
1136
1137 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1138
1139 **2. A9 01 00 01 11 07 D0**
1140
1141 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1142
1143 **3. A9 00 00 00 00 07 D0**
1144
1145 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1146
1147 **4. A9 00 11 01 00 07 D0**
1148
1149 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
1150
1151
1152
1153 ==== 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ====
1154
1155 * AT Command:
1156
1157 There is no AT Command to control Relay Output
1158
1159
1160 * Downlink Payload (prefix 0x03):
1161
1162 (% class="box infomessage" %)
1163 (((
1164 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1165 )))
1166
1167 (((
1168 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1169 )))
1170
1171 (((
1172 01: Close ,  00: Open , 11: No action
1173 )))
1174
1175 (((
1176 [[image:image-20220524093724-9.png]]
1177 )))
1178
1179 Device will upload a packet if downlink code executes successfully.
1180
1181
1182
1183 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1184
1185 * AT Command:
1186
1187 There is no AT Command to control Relay Output
1188
1189
1190 * Downlink Payload (prefix 0x05):
1191
1192 (% class="box infomessage" %)
1193 (((
1194 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1195 )))
1196
1197 This is to control the relay output time of relay. Include four bytes:
1198
1199 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1200
1201 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1202
1203 01: Relays will change back to original state after timeout.
1204
1205 00: Relays will change to an inverter state after timeout
1206
1207
1208 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1209
1210 [[image:image-20220524093831-10.png]]
1211
1212
1213 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1214
1215 Device will upload a packet if downlink code executes successfully.
1216
1217
1218 **Example payload:**
1219
1220 **~1. 05 01 11 07 D0**
1221
1222 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1223
1224 **2. 05 01 10 07 D0**
1225
1226 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1227
1228 **3. 05 00 01 07 D0**
1229
1230 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1231
1232 **4. 05 00 00 07 D0**
1233
1234 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1235
1236
1237
1238 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1239
1240 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1241
1242 * AT Command:
1243
1244 (% class="box infomessage" %)
1245 (((
1246 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1247 )))
1248
1249
1250 * Downlink Payload (prefix 0xA5):
1251
1252 (% class="box infomessage" %)
1253 (((
1254 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1255 )))
1256
1257
1258
1259 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1260
1261 * AT Command:
1262
1263 (% class="box infomessage" %)
1264 (((
1265 **AT+SETCNT=aa,(bb cc dd ee) **
1266 )))
1267
1268 aa: 1: Set count1,
1269
1270 2: Set count2,
1271
1272 3: Set AV1 count
1273
1274 Bb cc dd ee: number to be set
1275
1276
1277 * Downlink Payload (prefix 0xA8):
1278
1279 (% class="box infomessage" %)
1280 (((
1281 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1282 )))
1283
1284
1285
1286 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1287
1288 Clear counting for counting mode
1289
1290 * AT Command:
1291
1292 (% class="box infomessage" %)
1293 (((
1294 **AT+CLRCOUNT ~/~/ clear all counting**
1295 )))
1296
1297 * Downlink Payload (prefix 0xA6):
1298
1299 (% class="box infomessage" %)
1300 (((
1301 **0x A6 01     ~/~/ clear all counting,**
1302 )))
1303
1304
1305
1306 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1307
1308 * AT Command:
1309
1310 (% class="box infomessage" %)
1311 (((
1312 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1313 )))
1314
1315 * Downlink Payload (prefix 0xA7):
1316
1317 (% class="box infomessage" %)
1318 (((
1319 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1320 )))
1321
1322 (((
1323 range: aa bb cc:0 to 16777215,  (unit:second)
1324
1325
1326 )))
1327
1328
1329 == 3.5 Integrate with Mydevice ==
1330
1331 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:
1332
1333 (((
1334 (% style="color:blue" %)**Step 1**(%%): Be sure that your device is programmed and properly connected to the network at this time.
1335 )))
1336
1337 (((
1338 (% 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:
1339 )))
1340
1341 [[image:1653356737703-362.png||height="232" width="732"]]
1342
1343 [[image:image-20220524094641-11.png||height="390" width="723"]]
1344
1345
1346 [[image:image-20220524094641-12.png||height="402" width="718"]]
1347
1348
1349 (% style="color:blue" %)**Step 3**(%%): Create an account or log in Mydevices.
1350
1351 (% style="color:blue" %)**Step 4**(%%): Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1352
1353 Search under The things network
1354
1355 [[image:1653356838789-523.png||height="337" width="740"]]
1356
1357
1358
1359 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1360
1361 [[image:image-20220524094909-1.png||height="335" width="729"]]
1362
1363
1364 [[image:image-20220524094909-2.png||height="337" width="729"]]
1365
1366
1367 [[image:image-20220524094909-3.png||height="338" width="727"]]
1368
1369
1370 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1371
1372
1373 [[image:image-20220524094909-5.png||height="341" width="734"]]
1374
1375
1376
1377 == 3.6 Interface Detail ==
1378
1379 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1380
1381 Support NPN Type sensor
1382
1383 [[image:1653356991268-289.png]]
1384
1385
1386
1387 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1388
1389 (((
1390 The DI port of LT-22222-L can support NPN or PNP output sensor.
1391 )))
1392
1393 (((
1394 (((
1395 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
1396 )))
1397 )))
1398
1399 [[image:1653357170703-587.png]]
1400
1401 (((
1402 (((
1403 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1404 )))
1405 )))
1406
1407 (((
1408
1409 )))
1410
1411 (((
1412 (% style="color:blue" %)**Example1**(%%): Connect to a Low active sensor.
1413 )))
1414
1415 (((
1416 This type of sensor will output a low signal GND when active.
1417 )))
1418
1419 * (((
1420 Connect sensor’s output to DI1-
1421 )))
1422 * (((
1423 Connect sensor’s VCC to DI1+.
1424 )))
1425
1426 (((
1427 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1428 )))
1429
1430 (((
1431 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1432 )))
1433
1434 (((
1435 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.
1436 )))
1437
1438 (((
1439
1440 )))
1441
1442 (((
1443 (% style="color:blue" %)**Example2**(%%): Connect to a High active sensor.
1444 )))
1445
1446 (((
1447 This type of sensor will output a high signal (example 24v) when active.
1448 )))
1449
1450 * (((
1451 Connect sensor’s output to DI1+
1452 )))
1453 * (((
1454 Connect sensor’s GND DI1-.
1455 )))
1456
1457 (((
1458 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1459 )))
1460
1461 (((
1462 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1463 )))
1464
1465 (((
1466 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.
1467 )))
1468
1469 (((
1470
1471 )))
1472
1473 (((
1474 (% style="color:blue" %)**Example3**(%%): Connect to a 220v high active sensor.
1475 )))
1476
1477 (((
1478 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1479 )))
1480
1481 * (((
1482 Connect sensor’s output to DI1+ with a serial 50K resistor
1483 )))
1484 * (((
1485 Connect sensor’s GND DI1-.
1486 )))
1487
1488 (((
1489 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1490 )))
1491
1492 (((
1493 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1494 )))
1495
1496 (((
1497 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.
1498 )))
1499
1500
1501
1502 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1503
1504 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1505
1506 [[image:1653357531600-905.png]]
1507
1508
1509
1510 === 3.6.4 Analog Input Interface ===
1511
1512 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:
1513
1514
1515 (% style="color:blue" %)**AC2 = (IN2 voltage )/12**
1516
1517 [[image:1653357592296-182.png]]
1518
1519 Example to connect a 4~~20mA sensor
1520
1521 We take the wind speed sensor as an example for reference only.
1522
1523
1524 **Specifications of the wind speed sensor:**
1525
1526 Red:  12~~24v
1527
1528 Yellow:  4~~20mA
1529
1530 Black:  GND
1531
1532
1533 **Connection diagram:**
1534
1535 [[image:1653357640609-758.png]]
1536
1537 [[image:1653357648330-671.png||height="155" width="733"]]
1538
1539
1540
1541 === 3.6.5 Relay Output ===
1542
1543 (((
1544 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:
1545 )))
1546
1547 [[image:image-20220524100215-9.png]]
1548
1549 [[image:image-20220524100215-10.png||height="382" width="723"]]
1550
1551
1552
1553 == 3.7 LEDs Indicators ==
1554
1555 [[image:image-20220524100748-11.png]]
1556
1557
1558 = 4. Use AT Command =
1559
1560 == 4.1 Access AT Command ==
1561
1562 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.
1563
1564 [[image:1653358238933-385.png]]
1565
1566
1567 (((
1568 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:
1569 )))
1570
1571 [[image:1653358355238-883.png]]
1572
1573
1574 (((
1575 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/]]
1576 )))
1577
1578 (((
1579 AT+<CMD>?        : Help on <CMD>
1580 )))
1581
1582 (((
1583 AT+<CMD>         : Run <CMD>
1584 )))
1585
1586 (((
1587 AT+<CMD>=<value> : Set the value
1588 )))
1589
1590 (((
1591 AT+<CMD>=?       : Get the value
1592 )))
1593
1594 (((
1595 ATZ: Trig a reset of the MCU
1596 )))
1597
1598 (((
1599 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1600 )))
1601
1602 (((
1603 AT+DEUI: Get or Set the Device EUI
1604 )))
1605
1606 (((
1607 AT+DADDR: Get or Set the Device Address
1608 )))
1609
1610 (((
1611 AT+APPKEY: Get or Set the Application Key
1612 )))
1613
1614 (((
1615 AT+NWKSKEY: Get or Set the Network Session Key
1616 )))
1617
1618 (((
1619 AT+APPSKEY: Get or Set the Application Session Key
1620 )))
1621
1622 (((
1623 AT+APPEUI: Get or Set the Application EUI
1624 )))
1625
1626 (((
1627 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1628 )))
1629
1630 (((
1631 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1632 )))
1633
1634 (((
1635 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1636 )))
1637
1638 (((
1639 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1640 )))
1641
1642 (((
1643 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1644 )))
1645
1646 (((
1647 AT+RX2FQ: Get or Set the Rx2 window frequency
1648 )))
1649
1650 (((
1651 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1652 )))
1653
1654 (((
1655 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1656 )))
1657
1658 (((
1659 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1660 )))
1661
1662 (((
1663 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1664 )))
1665
1666 (((
1667 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1668 )))
1669
1670 (((
1671 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1672 )))
1673
1674 (((
1675 AT+NWKID: Get or Set the Network ID
1676 )))
1677
1678 (((
1679 AT+FCU: Get or Set the Frame Counter Uplink
1680 )))
1681
1682 (((
1683 AT+FCD: Get or Set the Frame Counter Downlink
1684 )))
1685
1686 (((
1687 AT+CLASS: Get or Set the Device Class
1688 )))
1689
1690 (((
1691 AT+JOIN: Join network
1692 )))
1693
1694 (((
1695 AT+NJS: Get OTAA Join Status
1696 )))
1697
1698 (((
1699 AT+SENDB: Send hexadecimal data along with the application port
1700 )))
1701
1702 (((
1703 AT+SEND: Send text data along with the application port
1704 )))
1705
1706 (((
1707 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1708 )))
1709
1710 (((
1711 AT+RECV: Print last received data in raw format
1712 )))
1713
1714 (((
1715 AT+VER: Get current image version and Frequency Band
1716 )))
1717
1718 (((
1719 AT+CFM: Get or Set the confirmation mode (0-1)
1720 )))
1721
1722 (((
1723 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1724 )))
1725
1726 (((
1727 AT+SNR: Get the SNR of the last received packet
1728 )))
1729
1730 (((
1731 AT+RSSI: Get the RSSI of the last received packet
1732 )))
1733
1734 (((
1735 AT+TDC: Get or set the application data transmission interval in ms
1736 )))
1737
1738 (((
1739 AT+PORT: Get or set the application port
1740 )))
1741
1742 (((
1743 AT+DISAT: Disable AT commands
1744 )))
1745
1746 (((
1747 AT+PWORD: Set password, max 9 digits
1748 )))
1749
1750 (((
1751 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1752 )))
1753
1754 (((
1755 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1756 )))
1757
1758 (((
1759 AT+CFG: Print all settings
1760
1761
1762 )))
1763
1764
1765
1766 == 4.2 Common AT Command Sequence ==
1767
1768 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1769
1770 (((
1771
1772
1773 **If device has not joined network yet:**
1774 )))
1775
1776 (((
1777 (% style="background-color:#dcdcdc" %)123456
1778 )))
1779
1780 (((
1781 (% style="background-color:#dcdcdc" %)AT+FDR
1782 )))
1783
1784 (((
1785 (% style="background-color:#dcdcdc" %)123456
1786 )))
1787
1788 (((
1789 (% style="background-color:#dcdcdc" %)AT+NJM=0
1790 )))
1791
1792 (((
1793 (% style="background-color:#dcdcdc" %)ATZ
1794 )))
1795
1796
1797 (((
1798 **If device already joined network:**
1799 )))
1800
1801 (((
1802 (% style="background-color:#dcdcdc" %)AT+NJM=0
1803 )))
1804
1805 (((
1806 (% style="background-color:#dcdcdc" %)ATZ
1807
1808
1809 )))
1810
1811
1812
1813 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1814
1815 (((
1816
1817
1818 (% style="background-color:#dcdcdc" %)123456(%%)  Enter Password to have AT access.
1819 )))
1820
1821 (((
1822 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1823 )))
1824
1825 (((
1826 (% style="background-color:#dcdcdc" %) 123456(%%)  Enter Password to have AT access.
1827 )))
1828
1829 (((
1830 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1831 )))
1832
1833 (((
1834 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%)  Set to ABP mode
1835 )))
1836
1837 (((
1838 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%)  Set the Adaptive Data Rate Off
1839 )))
1840
1841 (((
1842 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1843 )))
1844
1845 (((
1846 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1847 )))
1848
1849 (((
1850 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1851 )))
1852
1853 (((
1854 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%)  Set RX2Frequency to 868.4Mhz (according to the result from server)
1855 )))
1856
1857 (((
1858 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1859 )))
1860
1861 (((
1862 (% 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.
1863 )))
1864
1865 (((
1866 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1867
1868
1869 )))
1870
1871 (((
1872 (% style="color:red" %)**Note:**
1873 )))
1874
1875 (((
1876 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1877 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1878 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.
1879 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
1880 )))
1881
1882 (((
1883 [[image:1653359097980-169.png||height="188" width="729"]]
1884 )))
1885
1886 (((
1887
1888 )))
1889
1890
1891 === 4.2.3 Change to Class A ===
1892
1893 If sensor JOINED
1894 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1895 ATZ
1896
1897
1898 = 5. FAQ =
1899
1900 == 5.1 How to upgrade the image? ==
1901
1902
1903 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1904
1905 * Support new features
1906 * For bug fix
1907 * Change LoRaWAN bands.
1908
1909 Below shows the hardware connection for how to upload an image to the LT:
1910
1911 [[image:1653359603330-121.png]]
1912
1913
1914 (((
1915 (% 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]].
1916 (% 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/]].
1917 (% style="color:blue" %)**Step3**(%%)**:** Open flashloader; choose the correct COM port to update.
1918
1919
1920 (% style="color:blue" %)**For LT-22222-L**(%%):
1921 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.
1922 )))
1923
1924 [[image:image-20220524103407-12.png]]
1925
1926 [[image:image-20220524103429-13.png]]
1927
1928 [[image:image-20220524104033-15.png]]
1929
1930
1931 (% 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:
1932
1933 [[image:1653360054704-518.png||height="186" width="745"]]
1934
1935
1936 (((
1937 (((
1938
1939
1940 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1941 )))
1942 )))
1943
1944 (((
1945 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1946 )))
1947
1948 (((
1949
1950
1951 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1952 )))
1953
1954 (((
1955 (((
1956 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1957 )))
1958 )))
1959
1960 (((
1961 (((
1962 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1963
1964
1965 )))
1966 )))
1967
1968 (((
1969 (% 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.
1970 )))
1971
1972 (((
1973 [[image:1653360231087-571.png||height="401" width="727"]]
1974 )))
1975
1976 (((
1977 (% 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.
1978 )))
1979
1980
1981 (((
1982 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1983 )))
1984
1985 (((
1986 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1987 (% style="background-color:#dcdcdc" %)AT+FDR(%%)  Reset Parameters to Factory Default, Keys Reserve
1988 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1989 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%) Set to ABP mode
1990 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%) Set the Adaptive Data Rate Off
1991 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1992 (% style="background-color:#dcdcdc" %)AT+TDC=60000 (%%) Set transmit interval to 60 seconds
1993 (% style="background-color:#dcdcdc" %)AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1994 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%)  Set Device Address to 26 01 1A F1
1995 (% style="background-color:#dcdcdc" %)ATZ        (%%) Reset MCU
1996 )))
1997
1998
1999 (((
2000 As shown in below:
2001 )))
2002
2003 [[image:1653360498588-932.png||height="485" width="726"]]
2004
2005
2006 == 5.4 Can I see counting event in Serial? ==
2007
2008 (((
2009 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.
2010
2011
2012 == 5.5 Can i use point to point communication for LT-22222-L? ==
2013
2014 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
2015 )))
2016
2017 (((
2018
2019
2020 = 6. Trouble Shooting =
2021 )))
2022
2023 (((
2024 (((
2025 == 6.1 Downlink doesn’t work, how to solve it? ==
2026 )))
2027 )))
2028
2029 (((
2030 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
2031 )))
2032
2033 (((
2034
2035
2036 == 6.2 Have trouble to upload image. ==
2037 )))
2038
2039 (((
2040 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
2041 )))
2042
2043 (((
2044
2045
2046 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
2047 )))
2048
2049 (((
2050 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
2051 )))
2052
2053
2054
2055 = 7. Order Info =
2056
2057
2058 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
2059
2060
2061 (% style="color:#4f81bd" %)**XXX:**
2062
2063 * (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
2064 * (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
2065 * (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
2066 * (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
2067 * (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
2068 * (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
2069 * (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2070 * (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2071 * (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2072
2073 = 8. Packing Info =
2074
2075
2076 **Package Includes**:
2077
2078 * LT-22222-L I/O Controller x 1
2079 * Stick Antenna for LoRa RF part x 1
2080 * Bracket for controller x1
2081 * Program cable x 1
2082
2083 **Dimension and weight**:
2084
2085 * Device Size: 13.5 x 7 x 3 cm
2086 * Device Weight: 105g
2087 * Package Size / pcs : 14.5 x 8 x 5 cm
2088 * Weight / pcs : 170g
2089
2090 = 9. Support =
2091
2092 * (((
2093 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.
2094 )))
2095 * (((
2096 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]]
2097 )))
2098
2099 = 10. Reference​​​​​ =
2100
2101 * 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]]
2102 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2103 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2104 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]