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Version 77.20 by Xiaoling on 2022/06/10 08:40
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1 (% style="text-align:center" %)
2 [[image:image-20220523163353-1.jpeg||height="604" width="500"]]
3
4 **LT-22222-L LoRa IO Controller User Manual **
5
6
7 **Table of Contents:**
8
9 {{toc/}}
10
11
12
13
14
15
16
17 = 1.Introduction =
18
19 == 1.1 What is LT Series I/O Controller ==
20
21 (((
22 The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
23 )))
24
25 (((
26 The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
27 )))
28
29 (((
30 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
31 )))
32
33 (((
34 The use environment includes:
35 )))
36
37 (((
38 1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.
39 )))
40
41 (((
42 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
43 )))
44
45 (((
46 [[image:1653295757274-912.png]]
47
48
49 )))
50
51 == 1.2  Specifications ==
52
53 (((
54
55
56 **Hardware System:**
57 )))
58
59 * (((
60 STM32L072CZT6 MCU
61 )))
62 * (((
63 SX1276/78 Wireless Chip 
64 )))
65 * (((
66 (((
67 Power Consumption:
68 )))
69
70 * (((
71 Idle: 4mA@12v
72 )))
73 * (((
74 20dB Transmit: 34mA@12v
75 )))
76 )))
77
78
79 (((
80 **Interface for Model: LT22222-L:**
81 )))
82
83 * (((
84 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
85 )))
86 * (((
87 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
88 )))
89 * (((
90 2 x Relay Output (5A@250VAC / 30VDC)
91 )))
92 * (((
93 2 x 0~~20mA Analog Input (res:0.01mA)
94 )))
95 * (((
96 2 x 0~~30V Analog Input (res:0.01v)
97 )))
98 * (((
99 Power Input 7~~ 24V DC. 
100 )))
101
102
103 (((
104 **LoRa Spec:**
105 )))
106
107 * (((
108 (((
109 Frequency Range:
110 )))
111
112 * (((
113 Band 1 (HF): 862 ~~ 1020 Mhz
114 )))
115 * (((
116 Band 2 (LF): 410 ~~ 528 Mhz
117 )))
118 )))
119 * (((
120 168 dB maximum link budget.
121 )))
122 * (((
123 +20 dBm - 100 mW constant RF output vs.
124 )))
125 * (((
126 +14 dBm high efficiency PA.
127 )))
128 * (((
129 Programmable bit rate up to 300 kbps.
130 )))
131 * (((
132 High sensitivity: down to -148 dBm.
133 )))
134 * (((
135 Bullet-proof front end: IIP3 = -12.5 dBm.
136 )))
137 * (((
138 Excellent blocking immunity.
139 )))
140 * (((
141 Low RX current of 10.3 mA, 200 nA register retention.
142 )))
143 * (((
144 Fully integrated synthesizer with a resolution of 61 Hz.
145 )))
146 * (((
147 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
148 )))
149 * (((
150 Built-in bit synchronizer for clock recovery.
151 )))
152 * (((
153 Preamble detection.
154 )))
155 * (((
156 127 dB Dynamic Range RSSI.
157 )))
158 * (((
159 Automatic RF Sense and CAD with ultra-fast AFC.
160 )))
161 * (((
162 Packet engine up to 256 bytes with CRC.
163
164
165 )))
166
167
168
169 == 1.3 Features ==
170
171 * LoRaWAN Class A & Class C protocol
172 * Optional Customized LoRa Protocol
173 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
174 * AT Commands to change parameters
175 * Remote configure parameters via LoRa Downlink
176 * Firmware upgradable via program port
177 * Counting
178
179
180
181 == 1.4  Applications ==
182
183 * Smart Buildings & Home Automation
184 * Logistics and Supply Chain Management
185 * Smart Metering
186 * Smart Agriculture
187 * Smart Cities
188 * Smart Factory
189
190
191
192 == 1.5 Hardware Variants ==
193
194 (% border="1" style="background-color:#f7faff; width:500px" %)
195 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
196 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
197 * 2 x Digital Input (Bi-direction)
198 * 2 x Digital Output
199 * 2 x Relay Output (5A@250VAC / 30VDC)
200 * 2 x 0~~20mA Analog Input (res:0.01mA)
201 * 2 x 0~~30V Analog Input (res:0.01v)
202 * 1 x Counting Port
203 )))
204
205
206
207 = 2. Power ON Device =
208
209 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.
210
211 (((
212 PWR will on when device is properly powered.
213 )))
214
215 [[image:1653297104069-180.png]]
216
217
218
219 = 3. Operation Mode =
220
221 == 3.1 How it works? ==
222
223 (((
224 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. 
225 )))
226
227 (((
228 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.
229
230
231 )))
232
233
234
235 == 3.2 Example to join LoRaWAN network ==
236
237 (((
238 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. 
239 )))
240
241 [[image:image-20220523172350-1.png||height="266" width="864"]]
242
243 (((
244 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:
245 )))
246
247 (((
248 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
249 )))
250
251 (((
252 Each LT is shipped with a sticker with the default device EUI as below:
253 )))
254
255 [[image:1653297924498-393.png]]
256
257 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
258
259 Add APP EUI in the application.
260
261 [[image:1653297955910-247.png||height="321" width="716"]]
262
263
264 Add APP KEY and DEV EUI
265
266 [[image:1653298023685-319.png]]
267
268
269 (((
270 **Step 2**: Power on LT and it will auto join to the TTN network. After join success, it will start to upload message to TTN and user can see in the panel.
271 )))
272
273 [[image:1653298044601-602.png||height="405" width="709"]]
274
275
276
277 == 3.3 Uplink Payload ==
278
279 There are five working modes + one interrupt mode on LT for different type application:
280
281 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
282 * **MOD2**: Double DI Counting + DO + RO
283 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
284 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
285 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
286 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
287
288
289
290 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
291
292 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
293
294 [[image:image-20220523174024-3.png]]
295
296 (((
297 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
298 )))
299
300 [[image:image-20220523174254-4.png]]
301
302 * RO is for relay. ROx=1 : close，ROx=0 always open.
303 * DI is for digital input. DIx=1: high or float, DIx=0: low.
304 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
305
306 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
307
308 For example if payload is: [[image:image-20220523175847-2.png]]
309
310 **The value for the interface is:  **
311
312 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
313
314 AVI2 channel voltage is 0x04AC/1000=1.196V
315
316 ACI1 channel current is 0x1310/1000=4.880mA
317
318 ACI2 channel current is 0x1300/1000=4.864mA
319
320 The last byte 0xAA= 10101010(B) means
321
322 * [1] RO1 relay channel is close and the RO1 LED is ON.
323 * [0] RO2 relay channel is open and RO2 LED is OFF;
324
325
326 **LT22222-L:**
327
328 * [1] DI2 channel is high input and DI2 LED is ON;
329 * [0] DI1 channel is low input;
330
331 * [0] DO3 channel output state
332 ** DO3 is float in case no load between DO3 and V+.;
333 ** DO3 is high in case there is load between DO3 and V+.
334 ** DO3 LED is off in both case
335 * [1] DO2 channel output is low and DO2 LED is ON.
336 * [0] DO1 channel output state
337 ** DO1 is float in case no load between DO1 and V+.;
338 ** DO1 is high in case there is load between DO1 and V+.
339 ** DO1 LED is off in both case
340
341
342
343 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
344
345 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
346
347 (((
348 Total : 11 bytes payload
349 )))
350
351 [[image:image-20220523180452-3.png]]
352
353 (((
354 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
355 )))
356
357 [[image:image-20220523180506-4.png]]
358
359 * RO is for relay. ROx=1 : close，ROx=0 always open.
360 * FIRST: Indicate this is the first packet after join network.
361 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
362
363 (((
364 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
365 )))
366
367 (((
368 **To use counting mode, please run:**
369 )))
370
371 (% class="box infomessage" %)
372 (((
373 (((
374 **AT+MOD=2**
375 )))
376 )))
377
378 (% class="box infomessage" %)
379 (((
380 (((
381 **ATZ**
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
483 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
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 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
493 )))
494
495 [[image:image-20220523181727-7.png]]
496
497 * RO is for relay. ROx=1 : close，ROx=0 always open.
498 * FIRST: Indicate this is the first packet after join network.
499 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
500
501 (((
502 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
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 **Plus below command for AVI1 Counting:**
533 )))
534
535 (% class="box infomessage" %)
536 (((
537 (((
538 **AT+SETCNT=3,60   (set AVI Count to 60)**
539 )))
540 )))
541
542 (% class="box infomessage" %)
543 (((
544 (((
545 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
546 )))
547 )))
548
549 (% class="box infomessage" %)
550 (((
551 (((
552 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
553 )))
554 )))
555
556 (% class="box infomessage" %)
557 (((
558 (((
559 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
560 )))
561 )))
562
563
564
565 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
566
567 **LT22222-L**: This mode the DI1 is used as a counting pin.
568
569 [[image:image-20220523182334-9.png]]
570
571 (((
572 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
573 )))
574
575 * RO is for relay. ROx=1 : close，ROx=0 always open.
576 * FIRST: Indicate this is the first packet after join network.
577 * (((
578 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
579 )))
580
581 (((
582 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
583 )))
584
585 (((
586 **To use this mode, please run:**
587 )))
588
589 (% class="box infomessage" %)
590 (((
591 (((
592 **AT+MOD=5**
593 )))
594 )))
595
596 (% class="box infomessage" %)
597 (((
598 (((
599 **ATZ**
600 )))
601 )))
602
603 (((
604 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
605
606
607 )))
608
609
610
611 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
612
613 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
614
615 For example, if user has configured below commands:
616
617 * **AT+MOD=1 ** **~-~->** The normal working mode
618 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
619
620 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
621
622 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
623 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.**
624
625 **AT Command to set Trigger Condition**:
626
627 (% style="color:#4f81bd" %)**Trigger base on voltage**:
628
629 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
630
631 **Example:**
632
633 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)
634
635 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
636
637
638 (% style="color:#4f81bd" %)**Trigger base on current**:
639
640 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
641
642 **Example:**
643
644 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
645
646
647 (% style="color:#4f81bd" %)**Trigger base on DI status**:
648
649 DI status trigger Flag.
650
651 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
652
653 **Example:**
654
655 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
656
657
658 **Downlink Command to set Trigger Condition**
659
660 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
661
662 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
663
664 AA: Code for this downlink Command:
665
666 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
667
668 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
669
670 yy2 yy2: AC1 or AV1 high limit.
671
672 yy3 yy3: AC2 or AV2 low limit.
673
674 Yy4 yy4: AC2 or AV2 high limit.
675
676 **Example1**: AA 00 13 88 00 00 00 00 00 00
677
678 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
679
680 **Example2**: AA 02 01 00
681
682 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
683
684 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
685
686 MOD6 Payload : total 11 bytes payload
687
688 [[image:image-20220524085923-1.png]]
689
690 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
691
692 [[image:image-20220524090106-2.png]]
693
694 * Each bits shows if the corresponding trigger has been configured.
695
696 **Example:**
697
698 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
699
700
701 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
702
703 [[image:image-20220524090249-3.png]]
704
705 * Each bits shows which status has been trigger on this uplink.
706
707 **Example:**
708
709 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
710
711
712 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
713
714 [[image:image-20220524090456-4.png]]
715
716 * Each bits shows which status has been trigger on this uplink.
717
718 **Example:**
719
720 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
721
722 00000101: Means both DI1 and DI2 trigger are enabled.
723
724
725 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
726
727 Downlink command to poll MOD6 status:
728
729 **AB 06**
730
731 When device got this command, it will send the MOD6 payload.
732
733
734
735 === 3.3.7 Payload Decoder ===
736
737 (((
738 **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/]]
739
740
741 )))
742
743
744
745 == 3.4 ​Configure LT via AT or Downlink ==
746
747 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
748
749 (((
750 There are two kinds of Commands:
751 )))
752
753 * (% 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]]
754
755 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
756
757
758
759 === 3.4.1 Common Commands ===
760
761 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]]
762
763
764
765 === 3.4.2 Sensor related commands ===
766
767 ==== 3.4.2.1 Set Transmit Interval ====
768
769 Set device uplink interval.
770
771 * AT Command:
772
773 (% class="box infomessage" %)
774 (((
775 **AT+TDC=N **
776 )))
777
778 **Example: **AT+TDC=30000. Means set interval to 30 seconds
779
780 * Downlink Payload (prefix 0x01):
781
782 (% class="box infomessage" %)
783 (((
784 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
785 )))
786
787
788
789 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
790
791 Set work mode.
792
793 * AT Command:
794
795 (% class="box infomessage" %)
796 (((
797 **AT+MOD=N  **
798 )))
799
800 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
801
802 * Downlink Payload (prefix 0x0A):
803
804 (% class="box infomessage" %)
805 (((
806 **0x0A aa     ~/~/ Same as AT+MOD=aa**
807 )))
808
809
810
811 ==== 3.4.2.3 Poll an uplink ====
812
813 * AT Command:
814
815 There is no AT Command to poll uplink
816
817 * Downlink Payload (prefix 0x08):
818
819 (% class="box infomessage" %)
820 (((
821 **0x08 FF     ~/~/ Poll an uplink,**
822 )))
823
824 **Example**: 0x08FF, ask device to send an Uplink
825
826
827 ==== 3.4.2.4 Enable Trigger Mode ====
828
829 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
830
831 * AT Command:
832
833 (% class="box infomessage" %)
834 (((
835 **AT+ADDMOD6=1 or 0**
836 )))
837
838 1: Enable Trigger Mode
839
840 0: Disable Trigger Mode
841
842 * Downlink Payload (prefix 0x0A 06):
843
844 (% class="box infomessage" %)
845 (((
846 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
847 )))
848
849
850 ==== 3.4.2.5 Poll trigger settings ====
851
852 Poll trigger settings,
853
854 * AT Command:
855
856 There is no AT Command for this feature.
857
858 * Downlink Payload (prefix 0x AB 06):
859
860 (% class="box infomessage" %)
861 (((
862 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
863 )))
864
865
866 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
867
868 Enable Disable DI1/DI2/DI2 as trigger,
869
870 * AT Command:
871
872 (% class="box infomessage" %)
873 (((
874 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
875 )))
876
877 **Example:**
878
879 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
880
881 * Downlink Payload (prefix 0xAA 02):
882
883 (% class="box infomessage" %)
884 (((
885 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
886 )))
887
888
889 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
890
891 Set DI1 or DI3(for LT-33222-L) trigger.
892
893 * AT Command:
894
895 (% class="box infomessage" %)
896 (((
897 **AT+TRIG1=a,b**
898 )))
899
900 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
901
902 b : delay timing.
903
904 **Example:**
905
906 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
907
908 * Downlink Payload (prefix 0x09 01 ):
909
910 (% class="box infomessage" %)
911 (((
912 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
913 )))
914
915
916 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
917
918 Set DI2 trigger.
919
920 * AT Command:
921
922 (% class="box infomessage" %)
923 (((
924 **AT+TRIG2=a,b**
925 )))
926
927 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
928
929 b : delay timing.
930
931 **Example:**
932
933 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
934
935 * Downlink Payload (prefix 0x09 02 ):
936
937 (% class="box infomessage" %)
938 (((
939 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
940 )))
941
942
943 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
944
945 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
946
947 * AT Command:
948
949 (% class="box infomessage" %)
950 (((
951 **AT+ACLIM. **
952 )))
953
954 * Downlink Payload (prefix 0xAA 01 ):
955
956 (% class="box infomessage" %)
957 (((
958 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
959 )))
960
961
962 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
963
964 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
965
966 * AT Command:
967
968 (% class="box infomessage" %)
969 (((
970 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
971 )))
972
973 * Downlink Payload (prefix 0xAA 00 ):
974
975 (% class="box infomessage" %)
976 (((
977 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
978 )))
979
980
981 ==== 3.4.2.11 Trigger – Set minimum interval ====
982
983 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
984
985 * AT Command:
986
987 (% class="box infomessage" %)
988 (((
989 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
990 )))
991
992 * Downlink Payload (prefix 0xAC ):
993
994 (% class="box infomessage" %)
995 (((
996 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
997 )))
998
999
1000 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1001
1002 * AT Command:
1003
1004 There is no AT Command to control Digital Output
1005
1006 * Downlink Payload (prefix 0x02):
1007
1008 (% class="box infomessage" %)
1009 (((
1010 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1011 )))
1012
1013 (((
1014 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1015 )))
1016
1017 (((
1018 01: Low,  00: High ,  11: No action
1019 )))
1020
1021 [[image:image-20220524092754-5.png]]
1022
1023 (((
1024 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1025 )))
1026
1027 (((
1028 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1029 )))
1030
1031
1032 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1033
1034 * AT Command:
1035
1036 There is no AT Command to control Digital Output
1037
1038 * Downlink Payload (prefix 0xA9):
1039
1040 (% class="box infomessage" %)
1041 (((
1042 (((
1043 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1044 )))
1045 )))
1046
1047 This is to control the digital output time of DO pin. Include four bytes:
1048
1049 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1050
1051 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1052
1053 01: DO pins will change back to original state after timeout.
1054
1055 00: DO pins will change to an inverter state after timeout 
1056
1057 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1058
1059 [[image:image-20220524093238-6.png]]
1060
1061 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1062
1063 [[image:image-20220524093328-7.png]]
1064
1065 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1066
1067 [[image:image-20220524093351-8.png]]
1068
1069 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1070
1071 Latching time. Unit: ms
1072
1073 Device will upload a packet if downlink code executes successfully.
1074
1075 **Example payload:**
1076
1077 **~1. A9 01 01 01 01 07 D0**
1078
1079 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1080
1081 **2. A9 01 00 01 11 07 D0**
1082
1083 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1084
1085 **3. A9 00 00 00 00 07 D0**
1086
1087 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1088
1089 **4. A9 00 11 01 00 07 D0**
1090
1091 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
1092
1093
1094 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1095
1096 * AT Command:
1097
1098 There is no AT Command to control Relay Output
1099
1100 * Downlink Payload (prefix 0x03):
1101
1102 (% class="box infomessage" %)
1103 (((
1104 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1105 )))
1106
1107 (((
1108 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1109 )))
1110
1111 (((
1112 01: Close ,  00: Open , 11: No action
1113 )))
1114
1115 (((
1116 [[image:image-20220524093724-9.png]]
1117 )))
1118
1119 Device will upload a packet if downlink code executes successfully.
1120
1121
1122 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1123
1124 * AT Command:
1125
1126 There is no AT Command to control Relay Output
1127
1128 * Downlink Payload (prefix 0x05):
1129
1130 (% class="box infomessage" %)
1131 (((
1132 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1133 )))
1134
1135 This is to control the relay output time of relay. Include four bytes:
1136
1137 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1138
1139 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1140
1141 01: Relays will change back to original state after timeout.
1142
1143 00: Relays will change to an inverter state after timeout
1144
1145 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1146
1147 [[image:image-20220524093831-10.png]]
1148
1149 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1150
1151 Device will upload a packet if downlink code executes successfully.
1152
1153 **Example payload:**
1154
1155 **~1. 05 01 11 07 D0**
1156
1157 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1158
1159 **2. 05 01 10 07 D0**
1160
1161 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1162
1163 **3. 05 00 01 07 D0**
1164
1165 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1166
1167 **4. 05 00 00 07 D0**
1168
1169 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1170
1171
1172 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1173
1174 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1175
1176 * AT Command:
1177
1178 (% class="box infomessage" %)
1179 (((
1180 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1181 )))
1182
1183 * Downlink Payload (prefix 0xA5):
1184
1185 (% class="box infomessage" %)
1186 (((
1187 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1188 )))
1189
1190
1191 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1192
1193 * AT Command:
1194
1195 (% class="box infomessage" %)
1196 (((
1197 **AT+SETCNT=aa,(bb cc dd ee) **
1198 )))
1199
1200 aa: 1: Set count1,
1201
1202 2: Set count2,
1203
1204 3: Set AV1 count
1205
1206 Bb cc dd ee: number to be set
1207
1208 * Downlink Payload (prefix 0xA8):
1209
1210 (% class="box infomessage" %)
1211 (((
1212 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1213 )))
1214
1215
1216 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1217
1218 Clear counting for counting mode
1219
1220 * AT Command:
1221
1222 (% class="box infomessage" %)
1223 (((
1224 **AT+CLRCOUNT ~/~/ clear all counting**
1225 )))
1226
1227 * Downlink Payload (prefix 0xA6):
1228
1229 (% class="box infomessage" %)
1230 (((
1231 **0x A6 01     ~/~/ clear all counting,**
1232 )))
1233
1234
1235 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1236
1237 * AT Command:
1238
1239 (% class="box infomessage" %)
1240 (((
1241 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1242 )))
1243
1244 * Downlink Payload (prefix 0xA7):
1245
1246 (% class="box infomessage" %)
1247 (((
1248 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1249 )))
1250
1251 (((
1252 range: aa bb cc:0 to 16777215,  (unit:second)
1253
1254
1255 )))
1256
1257 == 3.5 Integrate with Mydevice ==
1258
1259 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:
1260
1261 (((
1262 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1263 )))
1264
1265 (((
1266 **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:
1267 )))
1268
1269 [[image:1653356737703-362.png||height="232" width="732"]]
1270
1271 [[image:image-20220524094641-11.png||height="390" width="723"]]
1272
1273 [[image:image-20220524094641-12.png||height="402" width="718"]]
1274
1275
1276 **Step 3**: Create an account or log in Mydevices.
1277
1278 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1279
1280 Search under The things network
1281
1282 [[image:1653356838789-523.png||height="337" width="740"]]
1283
1284
1285 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1286
1287 [[image:image-20220524094909-1.png||height="335" width="729"]]
1288
1289 [[image:image-20220524094909-2.png||height="337" width="729"]]
1290
1291 [[image:image-20220524094909-3.png||height="338" width="727"]]
1292
1293 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1294
1295 [[image:image-20220524094909-5.png||height="341" width="734"]]
1296
1297
1298 == 3.6 Interface Detail ==
1299
1300 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1301
1302 Support NPN Type sensor
1303
1304 [[image:1653356991268-289.png]]
1305
1306
1307 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1308
1309 (((
1310 The DI port of LT-22222-L can support NPN or PNP output sensor.
1311 )))
1312
1313 (((
1314 (((
1315 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
1316 )))
1317 )))
1318
1319 [[image:1653357170703-587.png]]
1320
1321 (((
1322 (((
1323 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1324 )))
1325 )))
1326
1327 (((
1328
1329 )))
1330
1331 (((
1332 **Example1**: Connect to a Low active sensor.
1333 )))
1334
1335 (((
1336 This type of sensor will output a low signal GND when active.
1337 )))
1338
1339 * (((
1340 Connect sensor’s output to DI1-
1341 )))
1342 * (((
1343 Connect sensor’s VCC to DI1+.
1344 )))
1345
1346 (((
1347 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1348 )))
1349
1350 (((
1351 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1352 )))
1353
1354 (((
1355 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.
1356 )))
1357
1358 (((
1359
1360 )))
1361
1362 (((
1363 **Example2**: Connect to a High active sensor.
1364 )))
1365
1366 (((
1367 This type of sensor will output a high signal (example 24v) when active.
1368 )))
1369
1370 * (((
1371 Connect sensor’s output to DI1+
1372 )))
1373 * (((
1374 Connect sensor’s GND DI1-.
1375 )))
1376
1377 (((
1378 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1379 )))
1380
1381 (((
1382 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1383 )))
1384
1385 (((
1386 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.
1387 )))
1388
1389 (((
1390
1391 )))
1392
1393 (((
1394 **Example3**: Connect to a 220v high active sensor.
1395 )))
1396
1397 (((
1398 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1399 )))
1400
1401 * (((
1402 Connect sensor’s output to DI1+ with a serial 50K resistor
1403 )))
1404 * (((
1405 Connect sensor’s GND DI1-.
1406 )))
1407
1408 (((
1409 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1410 )))
1411
1412 (((
1413 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1414 )))
1415
1416 (((
1417 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.
1418 )))
1419
1420
1421 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1422
1423 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1424
1425 [[image:1653357531600-905.png]]
1426
1427
1428 === 3.6.4 Analog Input Interface ===
1429
1430 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:
1431
1432 **AC2 = (IN2 voltage )/12**
1433
1434 [[image:1653357592296-182.png]]
1435
1436 Example to connect a 4~~20mA sensor
1437
1438 We take the wind speed sensor as an example for reference only.
1439
1440 Specifications of the wind speed sensor:
1441
1442 Red:12~~24v
1443
1444 Yellow:4~~20mA
1445
1446 Black:GND
1447
1448
1449 Connection diagram:
1450
1451 [[image:1653357640609-758.png]]
1452
1453 [[image:1653357648330-671.png||height="155" width="733"]]
1454
1455
1456 === 3.6.5 Relay Output ===
1457
1458 (((
1459 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:
1460 )))
1461
1462 [[image:image-20220524100215-9.png]]
1463
1464 [[image:image-20220524100215-10.png||height="382" width="723"]]
1465
1466
1467 == 3.7 LEDs Indicators ==
1468
1469 [[image:image-20220524100748-11.png]]
1470
1471
1472 = 4. Use AT Command =
1473
1474 == 4.1 Access AT Command ==
1475
1476 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.
1477
1478 [[image:1653358238933-385.png]]
1479
1480 (((
1481 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:
1482 )))
1483
1484 [[image:1653358355238-883.png]]
1485
1486 (((
1487 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/]]
1488 )))
1489
1490 (((
1491 AT+<CMD>?        : Help on <CMD>
1492 )))
1493
1494 (((
1495 AT+<CMD>         : Run <CMD>
1496 )))
1497
1498 (((
1499 AT+<CMD>=<value> : Set the value
1500 )))
1501
1502 (((
1503 AT+<CMD>=?       : Get the value
1504 )))
1505
1506 (((
1507 ATZ: Trig a reset of the MCU
1508 )))
1509
1510 (((
1511 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1512 )))
1513
1514 (((
1515 AT+DEUI: Get or Set the Device EUI
1516 )))
1517
1518 (((
1519 AT+DADDR: Get or Set the Device Address
1520 )))
1521
1522 (((
1523 AT+APPKEY: Get or Set the Application Key
1524 )))
1525
1526 (((
1527 AT+NWKSKEY: Get or Set the Network Session Key
1528 )))
1529
1530 (((
1531 AT+APPSKEY: Get or Set the Application Session Key
1532 )))
1533
1534 (((
1535 AT+APPEUI: Get or Set the Application EUI
1536 )))
1537
1538 (((
1539 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1540 )))
1541
1542 (((
1543 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1544 )))
1545
1546 (((
1547 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1548 )))
1549
1550 (((
1551 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1552 )))
1553
1554 (((
1555 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1556 )))
1557
1558 (((
1559 AT+RX2FQ: Get or Set the Rx2 window frequency
1560 )))
1561
1562 (((
1563 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1564 )))
1565
1566 (((
1567 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1568 )))
1569
1570 (((
1571 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1572 )))
1573
1574 (((
1575 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1576 )))
1577
1578 (((
1579 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1580 )))
1581
1582 (((
1583 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1584 )))
1585
1586 (((
1587 AT+NWKID: Get or Set the Network ID
1588 )))
1589
1590 (((
1591 AT+FCU: Get or Set the Frame Counter Uplink
1592 )))
1593
1594 (((
1595 AT+FCD: Get or Set the Frame Counter Downlink
1596 )))
1597
1598 (((
1599 AT+CLASS: Get or Set the Device Class
1600 )))
1601
1602 (((
1603 AT+JOIN: Join network
1604 )))
1605
1606 (((
1607 AT+NJS: Get OTAA Join Status
1608 )))
1609
1610 (((
1611 AT+SENDB: Send hexadecimal data along with the application port
1612 )))
1613
1614 (((
1615 AT+SEND: Send text data along with the application port
1616 )))
1617
1618 (((
1619 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1620 )))
1621
1622 (((
1623 AT+RECV: Print last received data in raw format
1624 )))
1625
1626 (((
1627 AT+VER: Get current image version and Frequency Band
1628 )))
1629
1630 (((
1631 AT+CFM: Get or Set the confirmation mode (0-1)
1632 )))
1633
1634 (((
1635 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1636 )))
1637
1638 (((
1639 AT+SNR: Get the SNR of the last received packet
1640 )))
1641
1642 (((
1643 AT+RSSI: Get the RSSI of the last received packet
1644 )))
1645
1646 (((
1647 AT+TDC: Get or set the application data transmission interval in ms
1648 )))
1649
1650 (((
1651 AT+PORT: Get or set the application port
1652 )))
1653
1654 (((
1655 AT+DISAT: Disable AT commands
1656 )))
1657
1658 (((
1659 AT+PWORD: Set password, max 9 digits
1660 )))
1661
1662 (((
1663 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1664 )))
1665
1666 (((
1667 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1668 )))
1669
1670 (((
1671 AT+CFG: Print all settings
1672
1673
1674 )))
1675
1676 == 4.2 Common AT Command Sequence ==
1677
1678 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1679
1680 (((
1681 If device has not joined network yet:
1682 )))
1683
1684 (((
1685 (% style="background-color:#dcdcdc" %)123456
1686 )))
1687
1688 (((
1689 (% style="background-color:#dcdcdc" %)AT+FDR
1690 )))
1691
1692 (((
1693 (% style="background-color:#dcdcdc" %)123456
1694 )))
1695
1696 (((
1697 (% style="background-color:#dcdcdc" %)AT+NJM=0
1698 )))
1699
1700 (((
1701 (% style="background-color:#dcdcdc" %)ATZ
1702 )))
1703
1704
1705 (((
1706 If device already joined network:
1707 )))
1708
1709 (((
1710 (% style="background-color:#dcdcdc" %)AT+NJM=0
1711 )))
1712
1713 (((
1714 (% style="background-color:#dcdcdc" %)ATZ
1715
1716
1717 )))
1718
1719 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1720
1721 (((
1722 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1723 )))
1724
1725 (((
1726 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1727 )))
1728
1729 (((
1730 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1731 )))
1732
1733 (((
1734 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1735 )))
1736
1737 (((
1738 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1739 )))
1740
1741 (((
1742 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1743 )))
1744
1745 (((
1746 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1747 )))
1748
1749 (((
1750 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1751 )))
1752
1753 (((
1754 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1755 )))
1756
1757 (((
1758 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1759 )))
1760
1761 (((
1762 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1763 )))
1764
1765 (((
1766 (% 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.
1767 )))
1768
1769 (((
1770 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1771 )))
1772
1773 (((
1774 (% style="color:red" %)**Note:**
1775 )))
1776
1777 (((
1778 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1779 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1780 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.
1781 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
1782 )))
1783
1784 (((
1785 [[image:1653359097980-169.png||height="188" width="729"]]
1786 )))
1787
1788 (((
1789
1790 )))
1791
1792 === 4.2.3 Change to Class A ===
1793
1794 If sensor JOINED
1795 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1796 ATZ
1797
1798
1799 = 5. FAQ =
1800
1801 == 5.1 How to upgrade the image? ==
1802
1803 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1804
1805 * Support new features
1806 * For bug fix
1807 * Change LoRaWAN bands.
1808 Below shows the hardware connection for how to upload an image to the LT:
1809 * [[image:1653359603330-121.png]]
1810
1811 (((
1812 **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]].
1813 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1814 **Step3: **Open flashloader; choose the correct COM port to update.
1815 **For LT-22222-L**:
1816 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.
1817 )))
1818
1819 [[image:image-20220524103407-12.png]]
1820
1821 [[image:image-20220524103429-13.png]]
1822
1823 [[image:image-20220524104033-15.png]]
1824
1825 (% 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:
1826
1827 [[image:1653360054704-518.png||height="186" width="745"]]
1828
1829
1830 (((
1831 (((
1832 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1833 )))
1834 )))
1835
1836 (((
1837 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1838
1839
1840 )))
1841
1842 (((
1843 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1844 )))
1845
1846 (((
1847 (((
1848 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1849 )))
1850 )))
1851
1852 (((
1853 (((
1854 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1855 )))
1856 )))
1857
1858 (((
1859 (% 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.
1860 )))
1861
1862 (((
1863 [[image:1653360231087-571.png||height="401" width="727"]]
1864 )))
1865
1866 (((
1867 (% 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.
1868 )))
1869
1870 (((
1871 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1872 )))
1873
1874 (((
1875 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1876 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1877 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1878 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1879 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1880 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1881 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1882 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1883 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1884 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1885 )))
1886
1887 (((
1888 As shown in below:
1889 )))
1890
1891 [[image:1653360498588-932.png||height="485" width="726"]]
1892
1893
1894 == 5.4 Can I see counting event in Serial? ==
1895
1896 (((
1897 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.
1898
1899
1900 == 5.5 Can i use point to point communication for LT-22222-L? ==
1901
1902 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1903
1904
1905 )))
1906
1907 (((
1908 = 6. Trouble Shooting =
1909 )))
1910
1911 (((
1912 (((
1913 == 6.1 Downlink doesn’t work, how to solve it? ==
1914 )))
1915 )))
1916
1917 (((
1918 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1919
1920
1921 )))
1922
1923 (((
1924 == 6.2 Have trouble to upload image. ==
1925 )))
1926
1927 (((
1928 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1929 )))
1930
1931 (((
1932
1933 )))
1934
1935 (((
1936 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1937 )))
1938
1939 (((
1940 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1941 )))
1942
1943 (((
1944
1945 )))
1946
1947 (((
1948 = 7. Order Info =
1949 )))
1950
1951 (((
1952 (((
1953 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1954 )))
1955 )))
1956
1957 (((
1958 (((
1959 (% style="color:#4f81bd" %)**XXX:**
1960 )))
1961 )))
1962
1963 (((
1964 * (((
1965 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1966 )))
1967 )))
1968
1969 (((
1970 * (((
1971 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1972 )))
1973 )))
1974
1975 (((
1976 * (((
1977 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1978 )))
1979 )))
1980
1981 (((
1982 * (((
1983 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1984 )))
1985 )))
1986
1987 (((
1988 * (((
1989 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1990 )))
1991 )))
1992
1993 (((
1994 * (((
1995 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1996 )))
1997 )))
1998
1999 (((
2000 * (((
2001 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2002 )))
2003 )))
2004
2005 (((
2006 * (((
2007 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2008 )))
2009 )))
2010
2011 (((
2012 * (((
2013 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2014
2015
2016 )))
2017
2018 = 8. Packing Info =
2019 )))
2020
2021 (((
2022 (((
2023 **Package Includes**:
2024 )))
2025 )))
2026
2027 (((
2028 (((
2029 * LT-22222-L I/O Controller x 1
2030 * Stick Antenna for LoRa RF part x 1
2031 * Bracket for controller x1
2032 * Program cable x 1
2033 )))
2034 )))
2035
2036 (((
2037 (((
2038 **Dimension and weight**:
2039 )))
2040 )))
2041
2042 (((
2043 (((
2044 * Device Size: 13.5 x 7 x 3 cm
2045 * Device Weight: 105g
2046 * Package Size / pcs : 14.5 x 8 x 5 cm
2047 * Weight / pcs : 170g
2048
2049
2050 )))
2051 )))
2052
2053 (((
2054 = 9. Support =
2055 )))
2056
2057 * (((
2058 (((
2059 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.
2060 )))
2061 )))
2062 * (((
2063 (((
2064 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
2065 )))
2066 )))
2067
2068 (((
2069 (((
2070 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2071
2072
2073 )))
2074
2075 (((
2076 = 10. Reference​​​​​ =
2077
2078 * Product Page:
2079
2080 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]]
2081
2082 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2083 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2084 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2085 )))
2086 )))