Version 77.5 by Xiaoling on 2022/06/10 08:38
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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 = 2. Power ON Device =
206
207 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.
208
209 (((
210 PWR will on when device is properly powered.
211 )))
212
213 [[image:1653297104069-180.png]]
214
215
216 = 3. Operation Mode =
217
218 == 3.1 How it works? ==
219
220 (((
221 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. 
222 )))
223
224 (((
225 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.
226
227
228 )))
229
230 == 3.2 Example to join LoRaWAN network ==
231
232 (((
233 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. 
234 )))
235
236 [[image:image-20220523172350-1.png||height="266" width="864"]]
237
238 (((
239 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:
240 )))
241
242 (((
243 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
244 )))
245
246 (((
247 Each LT is shipped with a sticker with the default device EUI as below:
248 )))
249
250 [[image:1653297924498-393.png]]
251
252 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
253
254 Add APP EUI in the application.
255
256 [[image:1653297955910-247.png||height="321" width="716"]]
257
258
259 Add APP KEY and DEV EUI
260
261 [[image:1653298023685-319.png]]
262
263
264 (((
265 **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.
266 )))
267
268 [[image:1653298044601-602.png||height="405" width="709"]]
269
270
271 == 3.3 Uplink Payload ==
272
273 There are five working modes + one interrupt mode on LT for different type application:
274
275 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
276 * **MOD2**: Double DI Counting + DO + RO
277 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
278 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
279 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
280 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
281
282 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
283
284 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
285
286 [[image:image-20220523174024-3.png]]
287
288 (((
289 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
290 )))
291
292 [[image:image-20220523174254-4.png]]
293
294 * RO is for relay. ROx=1 : close，ROx=0 always open.
295 * DI is for digital input. DIx=1: high or float, DIx=0: low.
296 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
297
298 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
299
300 For example if payload is: [[image:image-20220523175847-2.png]]
301
302 **The value for the interface is:  **
303
304 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
305
306 AVI2 channel voltage is 0x04AC/1000=1.196V
307
308 ACI1 channel current is 0x1310/1000=4.880mA
309
310 ACI2 channel current is 0x1300/1000=4.864mA
311
312 The last byte 0xAA= 10101010(B) means
313
314 * [1] RO1 relay channel is close and the RO1 LED is ON.
315 * [0] RO2 relay channel is open and RO2 LED is OFF;
316
317 **LT22222-L:**
318
319 * [1] DI2 channel is high input and DI2 LED is ON;
320 * [0] DI1 channel is low input;
321
322 * [0] DO3 channel output state
323 ** DO3 is float in case no load between DO3 and V+.;
324 ** DO3 is high in case there is load between DO3 and V+.
325 ** DO3 LED is off in both case
326 * [1] DO2 channel output is low and DO2 LED is ON.
327 * [0] DO1 channel output state
328 ** DO1 is float in case no load between DO1 and V+.;
329 ** DO1 is high in case there is load between DO1 and V+.
330 ** DO1 LED is off in both case
331
332 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
333
334 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
335
336 (((
337 Total : 11 bytes payload
338 )))
339
340 [[image:image-20220523180452-3.png]]
341
342 (((
343 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
344 )))
345
346 [[image:image-20220523180506-4.png]]
347
348 * RO is for relay. ROx=1 : close，ROx=0 always open.
349 * FIRST: Indicate this is the first packet after join network.
350 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
351
352 (((
353 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
354 )))
355
356 (((
357 **To use counting mode, please run:**
358 )))
359
360 (% class="box infomessage" %)
361 (((
362 (((
363 **AT+MOD=2**
364 )))
365 )))
366
367 (% class="box infomessage" %)
368 (((
369 (((
370 **ATZ**
371 )))
372 )))
373
374 (((
375 (% style="color:#4f81bd" %)**AT Commands for counting:**
376 )))
377
378 (((
379 **For LT22222-L:**
380 )))
381
382 (% class="box infomessage" %)
383 (((
384 (((
385 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
386 )))
387 )))
388
389 (% class="box infomessage" %)
390 (((
391 (((
392 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
393 )))
394 )))
395
396 (% class="box infomessage" %)
397 (((
398 (((
399 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
400 )))
401 )))
402
403 (% class="box infomessage" %)
404 (((
405 (((
406 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
407 )))
408 )))
409
410 (% class="box infomessage" %)
411 (((
412 (((
413 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
414 )))
415 )))
416
417 (% class="box infomessage" %)
418 (((
419 (((
420 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
421 )))
422 )))
423
424
425 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
426
427 **LT22222-L**: This mode the DI1 is used as a counting pin.
428
429 [[image:image-20220523181246-5.png]]
430
431 (((
432 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
433 )))
434
435 [[image:image-20220523181301-6.png]]
436
437 * RO is for relay. ROx=1 : close，ROx=0 always open.
438 * FIRST: Indicate this is the first packet after join network.
439 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
440
441 (((
442 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
443 )))
444
445 (((
446 **To use counting mode, please run:**
447 )))
448
449 (% class="box infomessage" %)
450 (((
451 (((
452 **AT+MOD=3**
453 )))
454 )))
455
456 (% class="box infomessage" %)
457 (((
458 (((
459 **ATZ**
460 )))
461 )))
462
463 (((
464 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
465
466
467 )))
468
469 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
470
471 **LT22222-L**: This mode the DI1 is used as a counting pin.
472
473 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.
474
475 [[image:image-20220523181903-8.png]]
476
477 (((
478 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
479 )))
480
481 [[image:image-20220523181727-7.png]]
482
483 * RO is for relay. ROx=1 : close，ROx=0 always open.
484 * FIRST: Indicate this is the first packet after join network.
485 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
486
487 (((
488 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
489 )))
490
491 (((
492 **To use this mode, please run:**
493 )))
494
495 (% class="box infomessage" %)
496 (((
497 (((
498 **AT+MOD=4**
499 )))
500 )))
501
502 (% class="box infomessage" %)
503 (((
504 (((
505 **ATZ**
506 )))
507 )))
508
509 (((
510
511 )))
512
513 (((
514 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
515 )))
516
517 (((
518 **Plus below command for AVI1 Counting:**
519 )))
520
521 (% class="box infomessage" %)
522 (((
523 (((
524 **AT+SETCNT=3,60   (set AVI Count to 60)**
525 )))
526 )))
527
528 (% class="box infomessage" %)
529 (((
530 (((
531 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
532 )))
533 )))
534
535 (% class="box infomessage" %)
536 (((
537 (((
538 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
539 )))
540 )))
541
542 (% class="box infomessage" %)
543 (((
544 (((
545 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
546 )))
547 )))
548
549
550 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
551
552 **LT22222-L**: This mode the DI1 is used as a counting pin.
553
554 [[image:image-20220523182334-9.png]]
555
556 (((
557 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
558 )))
559
560 * RO is for relay. ROx=1 : close，ROx=0 always open.
561 * FIRST: Indicate this is the first packet after join network.
562 * (((
563 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
564 )))
565
566 (((
567 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
568 )))
569
570 (((
571 **To use this mode, please run:**
572 )))
573
574 (% class="box infomessage" %)
575 (((
576 (((
577 **AT+MOD=5**
578 )))
579 )))
580
581 (% class="box infomessage" %)
582 (((
583 (((
584 **ATZ**
585 )))
586 )))
587
588 (((
589 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
590
591
592 )))
593
594 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
595
596 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
597
598 For example, if user has configured below commands:
599
600 * **AT+MOD=1 ** **~-~->** The normal working mode
601 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
602
603 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
604
605 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
606 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.**
607
608 **AT Command to set Trigger Condition**:
609
610 (% style="color:#4f81bd" %)**Trigger base on voltage**:
611
612 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
613
614 **Example:**
615
616 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)
617
618 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
619
620
621 (% style="color:#4f81bd" %)**Trigger base on current**:
622
623 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
624
625 **Example:**
626
627 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
628
629
630 (% style="color:#4f81bd" %)**Trigger base on DI status**:
631
632 DI status trigger Flag.
633
634 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
635
636 **Example:**
637
638 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
639
640
641 **Downlink Command to set Trigger Condition**
642
643 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
644
645 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
646
647 AA: Code for this downlink Command:
648
649 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
650
651 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
652
653 yy2 yy2: AC1 or AV1 high limit.
654
655 yy3 yy3: AC2 or AV2 low limit.
656
657 Yy4 yy4: AC2 or AV2 high limit.
658
659 **Example1**: AA 00 13 88 00 00 00 00 00 00
660
661 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
662
663 **Example2**: AA 02 01 00
664
665 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
666
667 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
668
669 MOD6 Payload : total 11 bytes payload
670
671 [[image:image-20220524085923-1.png]]
672
673 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
674
675 [[image:image-20220524090106-2.png]]
676
677 * Each bits shows if the corresponding trigger has been configured.
678
679 **Example:**
680
681 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
682
683
684 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
685
686 [[image:image-20220524090249-3.png]]
687
688 * Each bits shows which status has been trigger on this uplink.
689
690 **Example:**
691
692 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
693
694
695 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
696
697 [[image:image-20220524090456-4.png]]
698
699 * Each bits shows which status has been trigger on this uplink.
700
701 **Example:**
702
703 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
704
705 00000101: Means both DI1 and DI2 trigger are enabled.
706
707
708 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
709
710 Downlink command to poll MOD6 status:
711
712 **AB 06**
713
714 When device got this command, it will send the MOD6 payload.
715
716
717 === 3.3.7 Payload Decoder ===
718
719 (((
720 **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/]]
721
722
723 )))
724
725 == 3.4 ​Configure LT via AT or Downlink ==
726
727 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
728
729 (((
730 There are two kinds of Commands:
731 )))
732
733 * (% 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]]
734
735 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
736
737 === 3.4.1 Common Commands ===
738
739 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]]
740
741
742 === 3.4.2 Sensor related commands ===
743
744 ==== 3.4.2.1 Set Transmit Interval ====
745
746 Set device uplink interval.
747
748 * AT Command:
749
750 (% class="box infomessage" %)
751 (((
752 **AT+TDC=N **
753 )))
754
755 **Example: **AT+TDC=30000. Means set interval to 30 seconds
756
757 * Downlink Payload (prefix 0x01):
758
759 (% class="box infomessage" %)
760 (((
761 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
762 )))
763
764
765 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
766
767 Set work mode.
768
769 * AT Command:
770
771 (% class="box infomessage" %)
772 (((
773 **AT+MOD=N  **
774 )))
775
776 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
777
778 * Downlink Payload (prefix 0x0A):
779
780 (% class="box infomessage" %)
781 (((
782 **0x0A aa     ~/~/ Same as AT+MOD=aa**
783 )))
784
785
786 ==== 3.4.2.3 Poll an uplink ====
787
788 * AT Command:
789
790 There is no AT Command to poll uplink
791
792 * Downlink Payload (prefix 0x08):
793
794 (% class="box infomessage" %)
795 (((
796 **0x08 FF     ~/~/ Poll an uplink,**
797 )))
798
799 **Example**: 0x08FF, ask device to send an Uplink
800
801
802 ==== 3.4.2.4 Enable Trigger Mode ====
803
804 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
805
806 * AT Command:
807
808 (% class="box infomessage" %)
809 (((
810 **AT+ADDMOD6=1 or 0**
811 )))
812
813 1: Enable Trigger Mode
814
815 0: Disable Trigger Mode
816
817 * Downlink Payload (prefix 0x0A 06):
818
819 (% class="box infomessage" %)
820 (((
821 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
822 )))
823
824
825 ==== 3.4.2.5 Poll trigger settings ====
826
827 Poll trigger settings,
828
829 * AT Command:
830
831 There is no AT Command for this feature.
832
833 * Downlink Payload (prefix 0x AB 06):
834
835 (% class="box infomessage" %)
836 (((
837 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
838 )))
839
840
841 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
842
843 Enable Disable DI1/DI2/DI2 as trigger,
844
845 * AT Command:
846
847 (% class="box infomessage" %)
848 (((
849 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
850 )))
851
852 **Example:**
853
854 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
855
856 * Downlink Payload (prefix 0xAA 02):
857
858 (% class="box infomessage" %)
859 (((
860 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
861 )))
862
863
864 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
865
866 Set DI1 or DI3(for LT-33222-L) trigger.
867
868 * AT Command:
869
870 (% class="box infomessage" %)
871 (((
872 **AT+TRIG1=a,b**
873 )))
874
875 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
876
877 b : delay timing.
878
879 **Example:**
880
881 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
882
883 * Downlink Payload (prefix 0x09 01 ):
884
885 (% class="box infomessage" %)
886 (((
887 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
888 )))
889
890
891 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
892
893 Set DI2 trigger.
894
895 * AT Command:
896
897 (% class="box infomessage" %)
898 (((
899 **AT+TRIG2=a,b**
900 )))
901
902 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
903
904 b : delay timing.
905
906 **Example:**
907
908 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
909
910 * Downlink Payload (prefix 0x09 02 ):
911
912 (% class="box infomessage" %)
913 (((
914 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
915 )))
916
917
918 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
919
920 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
921
922 * AT Command:
923
924 (% class="box infomessage" %)
925 (((
926 **AT+ACLIM. **
927 )))
928
929 * Downlink Payload (prefix 0xAA 01 ):
930
931 (% class="box infomessage" %)
932 (((
933 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
934 )))
935
936
937 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
938
939 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
940
941 * AT Command:
942
943 (% class="box infomessage" %)
944 (((
945 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
946 )))
947
948 * Downlink Payload (prefix 0xAA 00 ):
949
950 (% class="box infomessage" %)
951 (((
952 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
953 )))
954
955
956 ==== 3.4.2.11 Trigger – Set minimum interval ====
957
958 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
959
960 * AT Command:
961
962 (% class="box infomessage" %)
963 (((
964 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
965 )))
966
967 * Downlink Payload (prefix 0xAC ):
968
969 (% class="box infomessage" %)
970 (((
971 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
972 )))
973
974
975 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
976
977 * AT Command:
978
979 There is no AT Command to control Digital Output
980
981 * Downlink Payload (prefix 0x02):
982
983 (% class="box infomessage" %)
984 (((
985 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
986 )))
987
988 (((
989 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
990 )))
991
992 (((
993 01: Low,  00: High ,  11: No action
994 )))
995
996 [[image:image-20220524092754-5.png]]
997
998 (((
999 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1000 )))
1001
1002 (((
1003 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1004 )))
1005
1006
1007 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1008
1009 * AT Command:
1010
1011 There is no AT Command to control Digital Output
1012
1013 * Downlink Payload (prefix 0xA9):
1014
1015 (% class="box infomessage" %)
1016 (((
1017 (((
1018 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1019 )))
1020 )))
1021
1022 This is to control the digital output time of DO pin. Include four bytes:
1023
1024 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1025
1026 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1027
1028 01: DO pins will change back to original state after timeout.
1029
1030 00: DO pins will change to an inverter state after timeout 
1031
1032 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1033
1034 [[image:image-20220524093238-6.png]]
1035
1036 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1037
1038 [[image:image-20220524093328-7.png]]
1039
1040 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1041
1042 [[image:image-20220524093351-8.png]]
1043
1044 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1045
1046 Latching time. Unit: ms
1047
1048 Device will upload a packet if downlink code executes successfully.
1049
1050 **Example payload:**
1051
1052 **~1. A9 01 01 01 01 07 D0**
1053
1054 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1055
1056 **2. A9 01 00 01 11 07 D0**
1057
1058 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1059
1060 **3. A9 00 00 00 00 07 D0**
1061
1062 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1063
1064 **4. A9 00 11 01 00 07 D0**
1065
1066 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
1067
1068
1069 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1070
1071 * AT Command:
1072
1073 There is no AT Command to control Relay Output
1074
1075 * Downlink Payload (prefix 0x03):
1076
1077 (% class="box infomessage" %)
1078 (((
1079 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1080 )))
1081
1082 (((
1083 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1084 )))
1085
1086 (((
1087 01: Close ,  00: Open , 11: No action
1088 )))
1089
1090 (((
1091 [[image:image-20220524093724-9.png]]
1092 )))
1093
1094 Device will upload a packet if downlink code executes successfully.
1095
1096
1097 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1098
1099 * AT Command:
1100
1101 There is no AT Command to control Relay Output
1102
1103 * Downlink Payload (prefix 0x05):
1104
1105 (% class="box infomessage" %)
1106 (((
1107 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1108 )))
1109
1110 This is to control the relay output time of relay. Include four bytes:
1111
1112 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1113
1114 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1115
1116 01: Relays will change back to original state after timeout.
1117
1118 00: Relays will change to an inverter state after timeout
1119
1120 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1121
1122 [[image:image-20220524093831-10.png]]
1123
1124 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1125
1126 Device will upload a packet if downlink code executes successfully.
1127
1128 **Example payload:**
1129
1130 **~1. 05 01 11 07 D0**
1131
1132 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1133
1134 **2. 05 01 10 07 D0**
1135
1136 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1137
1138 **3. 05 00 01 07 D0**
1139
1140 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1141
1142 **4. 05 00 00 07 D0**
1143
1144 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1145
1146
1147 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1148
1149 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1150
1151 * AT Command:
1152
1153 (% class="box infomessage" %)
1154 (((
1155 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1156 )))
1157
1158 * Downlink Payload (prefix 0xA5):
1159
1160 (% class="box infomessage" %)
1161 (((
1162 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1163 )))
1164
1165
1166 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1167
1168 * AT Command:
1169
1170 (% class="box infomessage" %)
1171 (((
1172 **AT+SETCNT=aa,(bb cc dd ee) **
1173 )))
1174
1175 aa: 1: Set count1,
1176
1177 2: Set count2,
1178
1179 3: Set AV1 count
1180
1181 Bb cc dd ee: number to be set
1182
1183 * Downlink Payload (prefix 0xA8):
1184
1185 (% class="box infomessage" %)
1186 (((
1187 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1188 )))
1189
1190
1191 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1192
1193 Clear counting for counting mode
1194
1195 * AT Command:
1196
1197 (% class="box infomessage" %)
1198 (((
1199 **AT+CLRCOUNT ~/~/ clear all counting**
1200 )))
1201
1202 * Downlink Payload (prefix 0xA6):
1203
1204 (% class="box infomessage" %)
1205 (((
1206 **0x A6 01     ~/~/ clear all counting,**
1207 )))
1208
1209
1210 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1211
1212 * AT Command:
1213
1214 (% class="box infomessage" %)
1215 (((
1216 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1217 )))
1218
1219 * Downlink Payload (prefix 0xA7):
1220
1221 (% class="box infomessage" %)
1222 (((
1223 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1224 )))
1225
1226 (((
1227 range: aa bb cc:0 to 16777215,  (unit:second)
1228
1229
1230 )))
1231
1232 == 3.5 Integrate with Mydevice ==
1233
1234 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:
1235
1236 (((
1237 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1238 )))
1239
1240 (((
1241 **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:
1242 )))
1243
1244 [[image:1653356737703-362.png||height="232" width="732"]]
1245
1246 [[image:image-20220524094641-11.png||height="390" width="723"]]
1247
1248 [[image:image-20220524094641-12.png||height="402" width="718"]]
1249
1250
1251 **Step 3**: Create an account or log in Mydevices.
1252
1253 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1254
1255 Search under The things network
1256
1257 [[image:1653356838789-523.png||height="337" width="740"]]
1258
1259
1260 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1261
1262 [[image:image-20220524094909-1.png||height="335" width="729"]]
1263
1264 [[image:image-20220524094909-2.png||height="337" width="729"]]
1265
1266 [[image:image-20220524094909-3.png||height="338" width="727"]]
1267
1268 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1269
1270 [[image:image-20220524094909-5.png||height="341" width="734"]]
1271
1272
1273 == 3.6 Interface Detail ==
1274
1275 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1276
1277 Support NPN Type sensor
1278
1279 [[image:1653356991268-289.png]]
1280
1281
1282 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1283
1284 (((
1285 The DI port of LT-22222-L can support NPN or PNP output sensor.
1286 )))
1287
1288 (((
1289 (((
1290 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
1291 )))
1292 )))
1293
1294 [[image:1653357170703-587.png]]
1295
1296 (((
1297 (((
1298 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1299 )))
1300 )))
1301
1302 (((
1303
1304 )))
1305
1306 (((
1307 **Example1**: Connect to a Low active sensor.
1308 )))
1309
1310 (((
1311 This type of sensor will output a low signal GND when active.
1312 )))
1313
1314 * (((
1315 Connect sensor’s output to DI1-
1316 )))
1317 * (((
1318 Connect sensor’s VCC to DI1+.
1319 )))
1320
1321 (((
1322 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1323 )))
1324
1325 (((
1326 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1327 )))
1328
1329 (((
1330 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.
1331 )))
1332
1333 (((
1334
1335 )))
1336
1337 (((
1338 **Example2**: Connect to a High active sensor.
1339 )))
1340
1341 (((
1342 This type of sensor will output a high signal (example 24v) when active.
1343 )))
1344
1345 * (((
1346 Connect sensor’s output to DI1+
1347 )))
1348 * (((
1349 Connect sensor’s GND DI1-.
1350 )))
1351
1352 (((
1353 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1354 )))
1355
1356 (((
1357 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1358 )))
1359
1360 (((
1361 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.
1362 )))
1363
1364 (((
1365
1366 )))
1367
1368 (((
1369 **Example3**: Connect to a 220v high active sensor.
1370 )))
1371
1372 (((
1373 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1374 )))
1375
1376 * (((
1377 Connect sensor’s output to DI1+ with a serial 50K resistor
1378 )))
1379 * (((
1380 Connect sensor’s GND DI1-.
1381 )))
1382
1383 (((
1384 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1385 )))
1386
1387 (((
1388 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1389 )))
1390
1391 (((
1392 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.
1393 )))
1394
1395
1396 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1397
1398 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1399
1400 [[image:1653357531600-905.png]]
1401
1402
1403 === 3.6.4 Analog Input Interface ===
1404
1405 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:
1406
1407 **AC2 = (IN2 voltage )/12**
1408
1409 [[image:1653357592296-182.png]]
1410
1411 Example to connect a 4~~20mA sensor
1412
1413 We take the wind speed sensor as an example for reference only.
1414
1415 Specifications of the wind speed sensor:
1416
1417 Red:12~~24v
1418
1419 Yellow:4~~20mA
1420
1421 Black:GND
1422
1423
1424 Connection diagram:
1425
1426 [[image:1653357640609-758.png]]
1427
1428 [[image:1653357648330-671.png||height="155" width="733"]]
1429
1430
1431 === 3.6.5 Relay Output ===
1432
1433 (((
1434 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:
1435 )))
1436
1437 [[image:image-20220524100215-9.png]]
1438
1439 [[image:image-20220524100215-10.png||height="382" width="723"]]
1440
1441
1442 == 3.7 LEDs Indicators ==
1443
1444 [[image:image-20220524100748-11.png]]
1445
1446
1447 = 4. Use AT Command =
1448
1449 == 4.1 Access AT Command ==
1450
1451 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.
1452
1453 [[image:1653358238933-385.png]]
1454
1455 (((
1456 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:
1457 )))
1458
1459 [[image:1653358355238-883.png]]
1460
1461 (((
1462 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/]]
1463 )))
1464
1465 (((
1466 AT+<CMD>?        : Help on <CMD>
1467 )))
1468
1469 (((
1470 AT+<CMD>         : Run <CMD>
1471 )))
1472
1473 (((
1474 AT+<CMD>=<value> : Set the value
1475 )))
1476
1477 (((
1478 AT+<CMD>=?       : Get the value
1479 )))
1480
1481 (((
1482 ATZ: Trig a reset of the MCU
1483 )))
1484
1485 (((
1486 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1487 )))
1488
1489 (((
1490 AT+DEUI: Get or Set the Device EUI
1491 )))
1492
1493 (((
1494 AT+DADDR: Get or Set the Device Address
1495 )))
1496
1497 (((
1498 AT+APPKEY: Get or Set the Application Key
1499 )))
1500
1501 (((
1502 AT+NWKSKEY: Get or Set the Network Session Key
1503 )))
1504
1505 (((
1506 AT+APPSKEY: Get or Set the Application Session Key
1507 )))
1508
1509 (((
1510 AT+APPEUI: Get or Set the Application EUI
1511 )))
1512
1513 (((
1514 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1515 )))
1516
1517 (((
1518 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1519 )))
1520
1521 (((
1522 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1523 )))
1524
1525 (((
1526 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1527 )))
1528
1529 (((
1530 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1531 )))
1532
1533 (((
1534 AT+RX2FQ: Get or Set the Rx2 window frequency
1535 )))
1536
1537 (((
1538 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1539 )))
1540
1541 (((
1542 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1543 )))
1544
1545 (((
1546 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1547 )))
1548
1549 (((
1550 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1551 )))
1552
1553 (((
1554 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1555 )))
1556
1557 (((
1558 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1559 )))
1560
1561 (((
1562 AT+NWKID: Get or Set the Network ID
1563 )))
1564
1565 (((
1566 AT+FCU: Get or Set the Frame Counter Uplink
1567 )))
1568
1569 (((
1570 AT+FCD: Get or Set the Frame Counter Downlink
1571 )))
1572
1573 (((
1574 AT+CLASS: Get or Set the Device Class
1575 )))
1576
1577 (((
1578 AT+JOIN: Join network
1579 )))
1580
1581 (((
1582 AT+NJS: Get OTAA Join Status
1583 )))
1584
1585 (((
1586 AT+SENDB: Send hexadecimal data along with the application port
1587 )))
1588
1589 (((
1590 AT+SEND: Send text data along with the application port
1591 )))
1592
1593 (((
1594 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1595 )))
1596
1597 (((
1598 AT+RECV: Print last received data in raw format
1599 )))
1600
1601 (((
1602 AT+VER: Get current image version and Frequency Band
1603 )))
1604
1605 (((
1606 AT+CFM: Get or Set the confirmation mode (0-1)
1607 )))
1608
1609 (((
1610 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1611 )))
1612
1613 (((
1614 AT+SNR: Get the SNR of the last received packet
1615 )))
1616
1617 (((
1618 AT+RSSI: Get the RSSI of the last received packet
1619 )))
1620
1621 (((
1622 AT+TDC: Get or set the application data transmission interval in ms
1623 )))
1624
1625 (((
1626 AT+PORT: Get or set the application port
1627 )))
1628
1629 (((
1630 AT+DISAT: Disable AT commands
1631 )))
1632
1633 (((
1634 AT+PWORD: Set password, max 9 digits
1635 )))
1636
1637 (((
1638 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1639 )))
1640
1641 (((
1642 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1643 )))
1644
1645 (((
1646 AT+CFG: Print all settings
1647
1648
1649 )))
1650
1651 == 4.2 Common AT Command Sequence ==
1652
1653 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1654
1655 (((
1656 If device has not joined network yet:
1657 )))
1658
1659 (((
1660 (% style="background-color:#dcdcdc" %)123456
1661 )))
1662
1663 (((
1664 (% style="background-color:#dcdcdc" %)AT+FDR
1665 )))
1666
1667 (((
1668 (% style="background-color:#dcdcdc" %)123456
1669 )))
1670
1671 (((
1672 (% style="background-color:#dcdcdc" %)AT+NJM=0
1673 )))
1674
1675 (((
1676 (% style="background-color:#dcdcdc" %)ATZ
1677 )))
1678
1679
1680 (((
1681 If device already joined network:
1682 )))
1683
1684 (((
1685 (% style="background-color:#dcdcdc" %)AT+NJM=0
1686 )))
1687
1688 (((
1689 (% style="background-color:#dcdcdc" %)ATZ
1690
1691
1692 )))
1693
1694 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1695
1696 (((
1697 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1698 )))
1699
1700 (((
1701 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1702 )))
1703
1704 (((
1705 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1706 )))
1707
1708 (((
1709 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1710 )))
1711
1712 (((
1713 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1714 )))
1715
1716 (((
1717 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1718 )))
1719
1720 (((
1721 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1722 )))
1723
1724 (((
1725 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1726 )))
1727
1728 (((
1729 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1730 )))
1731
1732 (((
1733 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1734 )))
1735
1736 (((
1737 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1738 )))
1739
1740 (((
1741 (% 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.
1742 )))
1743
1744 (((
1745 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1746 )))
1747
1748 (((
1749 (% style="color:red" %)**Note:**
1750 )))
1751
1752 (((
1753 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1754 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1755 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.
1756 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
1757 )))
1758
1759 (((
1760 [[image:1653359097980-169.png||height="188" width="729"]]
1761 )))
1762
1763 (((
1764
1765 )))
1766
1767 === 4.2.3 Change to Class A ===
1768
1769 If sensor JOINED
1770 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1771 ATZ
1772
1773
1774 = 5. FAQ =
1775
1776 == 5.1 How to upgrade the image? ==
1777
1778 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1779
1780 * Support new features
1781 * For bug fix
1782 * Change LoRaWAN bands.
1783 Below shows the hardware connection for how to upload an image to the LT:
1784 * [[image:1653359603330-121.png]]
1785
1786 (((
1787 **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]].
1788 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1789 **Step3: **Open flashloader; choose the correct COM port to update.
1790 **For LT-22222-L**:
1791 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.
1792 )))
1793
1794 [[image:image-20220524103407-12.png]]
1795
1796 [[image:image-20220524103429-13.png]]
1797
1798 [[image:image-20220524104033-15.png]]
1799
1800 (% 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:
1801
1802 [[image:1653360054704-518.png||height="186" width="745"]]
1803
1804
1805 (((
1806 (((
1807 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1808 )))
1809 )))
1810
1811 (((
1812 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1813
1814
1815 )))
1816
1817 (((
1818 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1819 )))
1820
1821 (((
1822 (((
1823 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1824 )))
1825 )))
1826
1827 (((
1828 (((
1829 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1830 )))
1831 )))
1832
1833 (((
1834 (% 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.
1835 )))
1836
1837 (((
1838 [[image:1653360231087-571.png||height="401" width="727"]]
1839 )))
1840
1841 (((
1842 (% 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.
1843 )))
1844
1845 (((
1846 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1847 )))
1848
1849 (((
1850 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1851 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1852 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1853 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1854 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1855 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1856 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1857 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1858 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1859 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1860 )))
1861
1862 (((
1863 As shown in below:
1864 )))
1865
1866 [[image:1653360498588-932.png||height="485" width="726"]]
1867
1868
1869 == 5.4 Can I see counting event in Serial? ==
1870
1871 (((
1872 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.
1873
1874
1875 == 5.5 Can i use point to point communication for LT-22222-L? ==
1876
1877 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1878
1879
1880 )))
1881
1882 (((
1883 = 6. Trouble Shooting =
1884 )))
1885
1886 (((
1887 (((
1888 == 6.1 Downlink doesn’t work, how to solve it? ==
1889 )))
1890 )))
1891
1892 (((
1893 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1894
1895
1896 )))
1897
1898 (((
1899 == 6.2 Have trouble to upload image. ==
1900 )))
1901
1902 (((
1903 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1904 )))
1905
1906 (((
1907
1908 )))
1909
1910 (((
1911 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1912 )))
1913
1914 (((
1915 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1916 )))
1917
1918 (((
1919
1920 )))
1921
1922 (((
1923 = 7. Order Info =
1924 )))
1925
1926 (((
1927 (((
1928 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1929 )))
1930 )))
1931
1932 (((
1933 (((
1934 (% style="color:#4f81bd" %)**XXX:**
1935 )))
1936 )))
1937
1938 (((
1939 * (((
1940 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1941 )))
1942 )))
1943
1944 (((
1945 * (((
1946 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1947 )))
1948 )))
1949
1950 (((
1951 * (((
1952 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1953 )))
1954 )))
1955
1956 (((
1957 * (((
1958 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1959 )))
1960 )))
1961
1962 (((
1963 * (((
1964 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1965 )))
1966 )))
1967
1968 (((
1969 * (((
1970 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1971 )))
1972 )))
1973
1974 (((
1975 * (((
1976 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1977 )))
1978 )))
1979
1980 (((
1981 * (((
1982 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1983 )))
1984 )))
1985
1986 (((
1987 * (((
1988 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1989
1990
1991 )))
1992
1993 = 8. Packing Info =
1994 )))
1995
1996 (((
1997 (((
1998 **Package Includes**:
1999 )))
2000 )))
2001
2002 (((
2003 (((
2004 * LT-22222-L I/O Controller x 1
2005 * Stick Antenna for LoRa RF part x 1
2006 * Bracket for controller x1
2007 * Program cable x 1
2008 )))
2009 )))
2010
2011 (((
2012 (((
2013 **Dimension and weight**:
2014 )))
2015 )))
2016
2017 (((
2018 (((
2019 * Device Size: 13.5 x 7 x 3 cm
2020 * Device Weight: 105g
2021 * Package Size / pcs : 14.5 x 8 x 5 cm
2022 * Weight / pcs : 170g
2023
2024
2025 )))
2026 )))
2027
2028 (((
2029 = 9. Support =
2030 )))
2031
2032 * (((
2033 (((
2034 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.
2035 )))
2036 )))
2037 * (((
2038 (((
2039 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
2040 )))
2041 )))
2042
2043 (((
2044 (((
2045 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2046
2047
2048 )))
2049
2050 (((
2051 = 10. Reference​​​​​ =
2052
2053 * Product Page:
2054
2055 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]]
2056
2057 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2058 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2059 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2060 )))
2061 )))

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