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Version 77.23 by Xiaoling on 2022/06/10 08:41
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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
828 ==== 3.4.2.4 Enable Trigger Mode ====
829
830 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
831
832 * AT Command:
833
834 (% class="box infomessage" %)
835 (((
836 **AT+ADDMOD6=1 or 0**
837 )))
838
839 1: Enable Trigger Mode
840
841 0: Disable Trigger Mode
842
843 * Downlink Payload (prefix 0x0A 06):
844
845 (% class="box infomessage" %)
846 (((
847 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
848 )))
849
850
851
852 ==== 3.4.2.5 Poll trigger settings ====
853
854 Poll trigger settings,
855
856 * AT Command:
857
858 There is no AT Command for this feature.
859
860 * Downlink Payload (prefix 0x AB 06):
861
862 (% class="box infomessage" %)
863 (((
864 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
865 )))
866
867
868
869 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
870
871 Enable Disable DI1/DI2/DI2 as trigger,
872
873 * AT Command:
874
875 (% class="box infomessage" %)
876 (((
877 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
878 )))
879
880 **Example:**
881
882 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
883
884 * Downlink Payload (prefix 0xAA 02):
885
886 (% class="box infomessage" %)
887 (((
888 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
889 )))
890
891
892 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
893
894 Set DI1 or DI3(for LT-33222-L) trigger.
895
896 * AT Command:
897
898 (% class="box infomessage" %)
899 (((
900 **AT+TRIG1=a,b**
901 )))
902
903 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
904
905 b : delay timing.
906
907 **Example:**
908
909 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
910
911 * Downlink Payload (prefix 0x09 01 ):
912
913 (% class="box infomessage" %)
914 (((
915 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
916 )))
917
918
919 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
920
921 Set DI2 trigger.
922
923 * AT Command:
924
925 (% class="box infomessage" %)
926 (((
927 **AT+TRIG2=a,b**
928 )))
929
930 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
931
932 b : delay timing.
933
934 **Example:**
935
936 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
937
938 * Downlink Payload (prefix 0x09 02 ):
939
940 (% class="box infomessage" %)
941 (((
942 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
943 )))
944
945
946 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
947
948 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
949
950 * AT Command:
951
952 (% class="box infomessage" %)
953 (((
954 **AT+ACLIM. **
955 )))
956
957 * Downlink Payload (prefix 0xAA 01 ):
958
959 (% class="box infomessage" %)
960 (((
961 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
962 )))
963
964
965 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
966
967 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
968
969 * AT Command:
970
971 (% class="box infomessage" %)
972 (((
973 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
974 )))
975
976 * Downlink Payload (prefix 0xAA 00 ):
977
978 (% class="box infomessage" %)
979 (((
980 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
981 )))
982
983
984 ==== 3.4.2.11 Trigger – Set minimum interval ====
985
986 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
987
988 * AT Command:
989
990 (% class="box infomessage" %)
991 (((
992 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
993 )))
994
995 * Downlink Payload (prefix 0xAC ):
996
997 (% class="box infomessage" %)
998 (((
999 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
1000 )))
1001
1002
1003 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1004
1005 * AT Command:
1006
1007 There is no AT Command to control Digital Output
1008
1009 * Downlink Payload (prefix 0x02):
1010
1011 (% class="box infomessage" %)
1012 (((
1013 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1014 )))
1015
1016 (((
1017 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1018 )))
1019
1020 (((
1021 01: Low,  00: High ,  11: No action
1022 )))
1023
1024 [[image:image-20220524092754-5.png]]
1025
1026 (((
1027 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1028 )))
1029
1030 (((
1031 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1032 )))
1033
1034
1035 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1036
1037 * AT Command:
1038
1039 There is no AT Command to control Digital Output
1040
1041 * Downlink Payload (prefix 0xA9):
1042
1043 (% class="box infomessage" %)
1044 (((
1045 (((
1046 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1047 )))
1048 )))
1049
1050 This is to control the digital output time of DO pin. Include four bytes:
1051
1052 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1053
1054 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1055
1056 01: DO pins will change back to original state after timeout.
1057
1058 00: DO pins will change to an inverter state after timeout 
1059
1060 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1061
1062 [[image:image-20220524093238-6.png]]
1063
1064 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1065
1066 [[image:image-20220524093328-7.png]]
1067
1068 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1069
1070 [[image:image-20220524093351-8.png]]
1071
1072 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1073
1074 Latching time. Unit: ms
1075
1076 Device will upload a packet if downlink code executes successfully.
1077
1078 **Example payload:**
1079
1080 **~1. A9 01 01 01 01 07 D0**
1081
1082 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1083
1084 **2. A9 01 00 01 11 07 D0**
1085
1086 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1087
1088 **3. A9 00 00 00 00 07 D0**
1089
1090 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1091
1092 **4. A9 00 11 01 00 07 D0**
1093
1094 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
1095
1096
1097 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1098
1099 * AT Command:
1100
1101 There is no AT Command to control Relay Output
1102
1103 * Downlink Payload (prefix 0x03):
1104
1105 (% class="box infomessage" %)
1106 (((
1107 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1108 )))
1109
1110 (((
1111 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1112 )))
1113
1114 (((
1115 01: Close ,  00: Open , 11: No action
1116 )))
1117
1118 (((
1119 [[image:image-20220524093724-9.png]]
1120 )))
1121
1122 Device will upload a packet if downlink code executes successfully.
1123
1124
1125 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1126
1127 * AT Command:
1128
1129 There is no AT Command to control Relay Output
1130
1131 * Downlink Payload (prefix 0x05):
1132
1133 (% class="box infomessage" %)
1134 (((
1135 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1136 )))
1137
1138 This is to control the relay output time of relay. Include four bytes:
1139
1140 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1141
1142 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1143
1144 01: Relays will change back to original state after timeout.
1145
1146 00: Relays will change to an inverter state after timeout
1147
1148 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1149
1150 [[image:image-20220524093831-10.png]]
1151
1152 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1153
1154 Device will upload a packet if downlink code executes successfully.
1155
1156 **Example payload:**
1157
1158 **~1. 05 01 11 07 D0**
1159
1160 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1161
1162 **2. 05 01 10 07 D0**
1163
1164 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1165
1166 **3. 05 00 01 07 D0**
1167
1168 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1169
1170 **4. 05 00 00 07 D0**
1171
1172 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1173
1174
1175 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1176
1177 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1178
1179 * AT Command:
1180
1181 (% class="box infomessage" %)
1182 (((
1183 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1184 )))
1185
1186 * Downlink Payload (prefix 0xA5):
1187
1188 (% class="box infomessage" %)
1189 (((
1190 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1191 )))
1192
1193
1194 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1195
1196 * AT Command:
1197
1198 (% class="box infomessage" %)
1199 (((
1200 **AT+SETCNT=aa,(bb cc dd ee) **
1201 )))
1202
1203 aa: 1: Set count1,
1204
1205 2: Set count2,
1206
1207 3: Set AV1 count
1208
1209 Bb cc dd ee: number to be set
1210
1211 * Downlink Payload (prefix 0xA8):
1212
1213 (% class="box infomessage" %)
1214 (((
1215 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1216 )))
1217
1218
1219 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1220
1221 Clear counting for counting mode
1222
1223 * AT Command:
1224
1225 (% class="box infomessage" %)
1226 (((
1227 **AT+CLRCOUNT ~/~/ clear all counting**
1228 )))
1229
1230 * Downlink Payload (prefix 0xA6):
1231
1232 (% class="box infomessage" %)
1233 (((
1234 **0x A6 01     ~/~/ clear all counting,**
1235 )))
1236
1237
1238 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1239
1240 * AT Command:
1241
1242 (% class="box infomessage" %)
1243 (((
1244 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1245 )))
1246
1247 * Downlink Payload (prefix 0xA7):
1248
1249 (% class="box infomessage" %)
1250 (((
1251 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1252 )))
1253
1254 (((
1255 range: aa bb cc:0 to 16777215,  (unit:second)
1256
1257
1258 )))
1259
1260 == 3.5 Integrate with Mydevice ==
1261
1262 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:
1263
1264 (((
1265 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1266 )))
1267
1268 (((
1269 **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:
1270 )))
1271
1272 [[image:1653356737703-362.png||height="232" width="732"]]
1273
1274 [[image:image-20220524094641-11.png||height="390" width="723"]]
1275
1276 [[image:image-20220524094641-12.png||height="402" width="718"]]
1277
1278
1279 **Step 3**: Create an account or log in Mydevices.
1280
1281 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1282
1283 Search under The things network
1284
1285 [[image:1653356838789-523.png||height="337" width="740"]]
1286
1287
1288 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1289
1290 [[image:image-20220524094909-1.png||height="335" width="729"]]
1291
1292 [[image:image-20220524094909-2.png||height="337" width="729"]]
1293
1294 [[image:image-20220524094909-3.png||height="338" width="727"]]
1295
1296 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1297
1298 [[image:image-20220524094909-5.png||height="341" width="734"]]
1299
1300
1301 == 3.6 Interface Detail ==
1302
1303 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1304
1305 Support NPN Type sensor
1306
1307 [[image:1653356991268-289.png]]
1308
1309
1310 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1311
1312 (((
1313 The DI port of LT-22222-L can support NPN or PNP output sensor.
1314 )))
1315
1316 (((
1317 (((
1318 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
1319 )))
1320 )))
1321
1322 [[image:1653357170703-587.png]]
1323
1324 (((
1325 (((
1326 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1327 )))
1328 )))
1329
1330 (((
1331
1332 )))
1333
1334 (((
1335 **Example1**: Connect to a Low active sensor.
1336 )))
1337
1338 (((
1339 This type of sensor will output a low signal GND when active.
1340 )))
1341
1342 * (((
1343 Connect sensor’s output to DI1-
1344 )))
1345 * (((
1346 Connect sensor’s VCC to DI1+.
1347 )))
1348
1349 (((
1350 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1351 )))
1352
1353 (((
1354 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1355 )))
1356
1357 (((
1358 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.
1359 )))
1360
1361 (((
1362
1363 )))
1364
1365 (((
1366 **Example2**: Connect to a High active sensor.
1367 )))
1368
1369 (((
1370 This type of sensor will output a high signal (example 24v) when active.
1371 )))
1372
1373 * (((
1374 Connect sensor’s output to DI1+
1375 )))
1376 * (((
1377 Connect sensor’s GND DI1-.
1378 )))
1379
1380 (((
1381 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1382 )))
1383
1384 (((
1385 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1386 )))
1387
1388 (((
1389 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.
1390 )))
1391
1392 (((
1393
1394 )))
1395
1396 (((
1397 **Example3**: Connect to a 220v high active sensor.
1398 )))
1399
1400 (((
1401 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1402 )))
1403
1404 * (((
1405 Connect sensor’s output to DI1+ with a serial 50K resistor
1406 )))
1407 * (((
1408 Connect sensor’s GND DI1-.
1409 )))
1410
1411 (((
1412 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1413 )))
1414
1415 (((
1416 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1417 )))
1418
1419 (((
1420 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.
1421 )))
1422
1423
1424 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1425
1426 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1427
1428 [[image:1653357531600-905.png]]
1429
1430
1431 === 3.6.4 Analog Input Interface ===
1432
1433 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:
1434
1435 **AC2 = (IN2 voltage )/12**
1436
1437 [[image:1653357592296-182.png]]
1438
1439 Example to connect a 4~~20mA sensor
1440
1441 We take the wind speed sensor as an example for reference only.
1442
1443 Specifications of the wind speed sensor:
1444
1445 Red:12~~24v
1446
1447 Yellow:4~~20mA
1448
1449 Black:GND
1450
1451
1452 Connection diagram:
1453
1454 [[image:1653357640609-758.png]]
1455
1456 [[image:1653357648330-671.png||height="155" width="733"]]
1457
1458
1459 === 3.6.5 Relay Output ===
1460
1461 (((
1462 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:
1463 )))
1464
1465 [[image:image-20220524100215-9.png]]
1466
1467 [[image:image-20220524100215-10.png||height="382" width="723"]]
1468
1469
1470 == 3.7 LEDs Indicators ==
1471
1472 [[image:image-20220524100748-11.png]]
1473
1474
1475 = 4. Use AT Command =
1476
1477 == 4.1 Access AT Command ==
1478
1479 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.
1480
1481 [[image:1653358238933-385.png]]
1482
1483 (((
1484 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:
1485 )))
1486
1487 [[image:1653358355238-883.png]]
1488
1489 (((
1490 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/]]
1491 )))
1492
1493 (((
1494 AT+<CMD>?        : Help on <CMD>
1495 )))
1496
1497 (((
1498 AT+<CMD>         : Run <CMD>
1499 )))
1500
1501 (((
1502 AT+<CMD>=<value> : Set the value
1503 )))
1504
1505 (((
1506 AT+<CMD>=?       : Get the value
1507 )))
1508
1509 (((
1510 ATZ: Trig a reset of the MCU
1511 )))
1512
1513 (((
1514 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1515 )))
1516
1517 (((
1518 AT+DEUI: Get or Set the Device EUI
1519 )))
1520
1521 (((
1522 AT+DADDR: Get or Set the Device Address
1523 )))
1524
1525 (((
1526 AT+APPKEY: Get or Set the Application Key
1527 )))
1528
1529 (((
1530 AT+NWKSKEY: Get or Set the Network Session Key
1531 )))
1532
1533 (((
1534 AT+APPSKEY: Get or Set the Application Session Key
1535 )))
1536
1537 (((
1538 AT+APPEUI: Get or Set the Application EUI
1539 )))
1540
1541 (((
1542 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1543 )))
1544
1545 (((
1546 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1547 )))
1548
1549 (((
1550 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1551 )))
1552
1553 (((
1554 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1555 )))
1556
1557 (((
1558 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1559 )))
1560
1561 (((
1562 AT+RX2FQ: Get or Set the Rx2 window frequency
1563 )))
1564
1565 (((
1566 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1567 )))
1568
1569 (((
1570 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1571 )))
1572
1573 (((
1574 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1575 )))
1576
1577 (((
1578 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1579 )))
1580
1581 (((
1582 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1583 )))
1584
1585 (((
1586 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1587 )))
1588
1589 (((
1590 AT+NWKID: Get or Set the Network ID
1591 )))
1592
1593 (((
1594 AT+FCU: Get or Set the Frame Counter Uplink
1595 )))
1596
1597 (((
1598 AT+FCD: Get or Set the Frame Counter Downlink
1599 )))
1600
1601 (((
1602 AT+CLASS: Get or Set the Device Class
1603 )))
1604
1605 (((
1606 AT+JOIN: Join network
1607 )))
1608
1609 (((
1610 AT+NJS: Get OTAA Join Status
1611 )))
1612
1613 (((
1614 AT+SENDB: Send hexadecimal data along with the application port
1615 )))
1616
1617 (((
1618 AT+SEND: Send text data along with the application port
1619 )))
1620
1621 (((
1622 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1623 )))
1624
1625 (((
1626 AT+RECV: Print last received data in raw format
1627 )))
1628
1629 (((
1630 AT+VER: Get current image version and Frequency Band
1631 )))
1632
1633 (((
1634 AT+CFM: Get or Set the confirmation mode (0-1)
1635 )))
1636
1637 (((
1638 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1639 )))
1640
1641 (((
1642 AT+SNR: Get the SNR of the last received packet
1643 )))
1644
1645 (((
1646 AT+RSSI: Get the RSSI of the last received packet
1647 )))
1648
1649 (((
1650 AT+TDC: Get or set the application data transmission interval in ms
1651 )))
1652
1653 (((
1654 AT+PORT: Get or set the application port
1655 )))
1656
1657 (((
1658 AT+DISAT: Disable AT commands
1659 )))
1660
1661 (((
1662 AT+PWORD: Set password, max 9 digits
1663 )))
1664
1665 (((
1666 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1667 )))
1668
1669 (((
1670 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1671 )))
1672
1673 (((
1674 AT+CFG: Print all settings
1675
1676
1677 )))
1678
1679 == 4.2 Common AT Command Sequence ==
1680
1681 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1682
1683 (((
1684 If device has not joined network yet:
1685 )))
1686
1687 (((
1688 (% style="background-color:#dcdcdc" %)123456
1689 )))
1690
1691 (((
1692 (% style="background-color:#dcdcdc" %)AT+FDR
1693 )))
1694
1695 (((
1696 (% style="background-color:#dcdcdc" %)123456
1697 )))
1698
1699 (((
1700 (% style="background-color:#dcdcdc" %)AT+NJM=0
1701 )))
1702
1703 (((
1704 (% style="background-color:#dcdcdc" %)ATZ
1705 )))
1706
1707
1708 (((
1709 If device already joined network:
1710 )))
1711
1712 (((
1713 (% style="background-color:#dcdcdc" %)AT+NJM=0
1714 )))
1715
1716 (((
1717 (% style="background-color:#dcdcdc" %)ATZ
1718
1719
1720 )))
1721
1722 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1723
1724 (((
1725 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1726 )))
1727
1728 (((
1729 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1730 )))
1731
1732 (((
1733 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1734 )))
1735
1736 (((
1737 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1738 )))
1739
1740 (((
1741 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1742 )))
1743
1744 (((
1745 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1746 )))
1747
1748 (((
1749 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1750 )))
1751
1752 (((
1753 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1754 )))
1755
1756 (((
1757 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1758 )))
1759
1760 (((
1761 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1762 )))
1763
1764 (((
1765 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1766 )))
1767
1768 (((
1769 (% 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.
1770 )))
1771
1772 (((
1773 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1774 )))
1775
1776 (((
1777 (% style="color:red" %)**Note:**
1778 )))
1779
1780 (((
1781 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1782 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1783 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.
1784 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
1785 )))
1786
1787 (((
1788 [[image:1653359097980-169.png||height="188" width="729"]]
1789 )))
1790
1791 (((
1792
1793 )))
1794
1795 === 4.2.3 Change to Class A ===
1796
1797 If sensor JOINED
1798 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1799 ATZ
1800
1801
1802 = 5. FAQ =
1803
1804 == 5.1 How to upgrade the image? ==
1805
1806 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1807
1808 * Support new features
1809 * For bug fix
1810 * Change LoRaWAN bands.
1811 Below shows the hardware connection for how to upload an image to the LT:
1812 * [[image:1653359603330-121.png]]
1813
1814 (((
1815 **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]].
1816 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1817 **Step3: **Open flashloader; choose the correct COM port to update.
1818 **For LT-22222-L**:
1819 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.
1820 )))
1821
1822 [[image:image-20220524103407-12.png]]
1823
1824 [[image:image-20220524103429-13.png]]
1825
1826 [[image:image-20220524104033-15.png]]
1827
1828 (% 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:
1829
1830 [[image:1653360054704-518.png||height="186" width="745"]]
1831
1832
1833 (((
1834 (((
1835 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1836 )))
1837 )))
1838
1839 (((
1840 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1841
1842
1843 )))
1844
1845 (((
1846 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1847 )))
1848
1849 (((
1850 (((
1851 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1852 )))
1853 )))
1854
1855 (((
1856 (((
1857 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1858 )))
1859 )))
1860
1861 (((
1862 (% 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.
1863 )))
1864
1865 (((
1866 [[image:1653360231087-571.png||height="401" width="727"]]
1867 )))
1868
1869 (((
1870 (% 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.
1871 )))
1872
1873 (((
1874 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1875 )))
1876
1877 (((
1878 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1879 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1880 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1881 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1882 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1883 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1884 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1885 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1886 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1887 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1888 )))
1889
1890 (((
1891 As shown in below:
1892 )))
1893
1894 [[image:1653360498588-932.png||height="485" width="726"]]
1895
1896
1897 == 5.4 Can I see counting event in Serial? ==
1898
1899 (((
1900 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.
1901
1902
1903 == 5.5 Can i use point to point communication for LT-22222-L? ==
1904
1905 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1906
1907
1908 )))
1909
1910 (((
1911 = 6. Trouble Shooting =
1912 )))
1913
1914 (((
1915 (((
1916 == 6.1 Downlink doesn’t work, how to solve it? ==
1917 )))
1918 )))
1919
1920 (((
1921 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1922
1923
1924 )))
1925
1926 (((
1927 == 6.2 Have trouble to upload image. ==
1928 )))
1929
1930 (((
1931 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1932 )))
1933
1934 (((
1935
1936 )))
1937
1938 (((
1939 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1940 )))
1941
1942 (((
1943 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1944 )))
1945
1946 (((
1947
1948 )))
1949
1950 (((
1951 = 7. Order Info =
1952 )))
1953
1954 (((
1955 (((
1956 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1957 )))
1958 )))
1959
1960 (((
1961 (((
1962 (% style="color:#4f81bd" %)**XXX:**
1963 )))
1964 )))
1965
1966 (((
1967 * (((
1968 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1969 )))
1970 )))
1971
1972 (((
1973 * (((
1974 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1975 )))
1976 )))
1977
1978 (((
1979 * (((
1980 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1981 )))
1982 )))
1983
1984 (((
1985 * (((
1986 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1987 )))
1988 )))
1989
1990 (((
1991 * (((
1992 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1993 )))
1994 )))
1995
1996 (((
1997 * (((
1998 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1999 )))
2000 )))
2001
2002 (((
2003 * (((
2004 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2005 )))
2006 )))
2007
2008 (((
2009 * (((
2010 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2011 )))
2012 )))
2013
2014 (((
2015 * (((
2016 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2017
2018
2019 )))
2020
2021 = 8. Packing Info =
2022 )))
2023
2024 (((
2025 (((
2026 **Package Includes**:
2027 )))
2028 )))
2029
2030 (((
2031 (((
2032 * LT-22222-L I/O Controller x 1
2033 * Stick Antenna for LoRa RF part x 1
2034 * Bracket for controller x1
2035 * Program cable x 1
2036 )))
2037 )))
2038
2039 (((
2040 (((
2041 **Dimension and weight**:
2042 )))
2043 )))
2044
2045 (((
2046 (((
2047 * Device Size: 13.5 x 7 x 3 cm
2048 * Device Weight: 105g
2049 * Package Size / pcs : 14.5 x 8 x 5 cm
2050 * Weight / pcs : 170g
2051
2052
2053 )))
2054 )))
2055
2056 (((
2057 = 9. Support =
2058 )))
2059
2060 * (((
2061 (((
2062 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.
2063 )))
2064 )))
2065 * (((
2066 (((
2067 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
2068 )))
2069 )))
2070
2071 (((
2072 (((
2073 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2074
2075
2076 )))
2077
2078 (((
2079 = 10. Reference​​​​​ =
2080
2081 * Product Page:
2082
2083 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]]
2084
2085 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2086 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2087 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2088 )))
2089 )))