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Version 77.8 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
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 == 3.3 Uplink Payload ==
277
278 There are five working modes + one interrupt mode on LT for different type application:
279
280 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
281 * **MOD2**: Double DI Counting + DO + RO
282 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
283 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
284 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
285 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
286
287 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
288
289 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
290
291 [[image:image-20220523174024-3.png]]
292
293 (((
294 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
295 )))
296
297 [[image:image-20220523174254-4.png]]
298
299 * RO is for relay. ROx=1 : close，ROx=0 always open.
300 * DI is for digital input. DIx=1: high or float, DIx=0: low.
301 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
302
303 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
304
305 For example if payload is: [[image:image-20220523175847-2.png]]
306
307 **The value for the interface is:  **
308
309 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
310
311 AVI2 channel voltage is 0x04AC/1000=1.196V
312
313 ACI1 channel current is 0x1310/1000=4.880mA
314
315 ACI2 channel current is 0x1300/1000=4.864mA
316
317 The last byte 0xAA= 10101010(B) means
318
319 * [1] RO1 relay channel is close and the RO1 LED is ON.
320 * [0] RO2 relay channel is open and RO2 LED is OFF;
321
322 **LT22222-L:**
323
324 * [1] DI2 channel is high input and DI2 LED is ON;
325 * [0] DI1 channel is low input;
326
327 * [0] DO3 channel output state
328 ** DO3 is float in case no load between DO3 and V+.;
329 ** DO3 is high in case there is load between DO3 and V+.
330 ** DO3 LED is off in both case
331 * [1] DO2 channel output is low and DO2 LED is ON.
332 * [0] DO1 channel output state
333 ** DO1 is float in case no load between DO1 and V+.;
334 ** DO1 is high in case there is load between DO1 and V+.
335 ** DO1 LED is off in both case
336
337 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
338
339 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
340
341 (((
342 Total : 11 bytes payload
343 )))
344
345 [[image:image-20220523180452-3.png]]
346
347 (((
348 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
349 )))
350
351 [[image:image-20220523180506-4.png]]
352
353 * RO is for relay. ROx=1 : close，ROx=0 always open.
354 * FIRST: Indicate this is the first packet after join network.
355 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
356
357 (((
358 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
359 )))
360
361 (((
362 **To use counting mode, please run:**
363 )))
364
365 (% class="box infomessage" %)
366 (((
367 (((
368 **AT+MOD=2**
369 )))
370 )))
371
372 (% class="box infomessage" %)
373 (((
374 (((
375 **ATZ**
376 )))
377 )))
378
379 (((
380 (% style="color:#4f81bd" %)**AT Commands for counting:**
381 )))
382
383 (((
384 **For LT22222-L:**
385 )))
386
387 (% class="box infomessage" %)
388 (((
389 (((
390 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
391 )))
392 )))
393
394 (% class="box infomessage" %)
395 (((
396 (((
397 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
398 )))
399 )))
400
401 (% class="box infomessage" %)
402 (((
403 (((
404 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
405 )))
406 )))
407
408 (% class="box infomessage" %)
409 (((
410 (((
411 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
412 )))
413 )))
414
415 (% class="box infomessage" %)
416 (((
417 (((
418 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
419 )))
420 )))
421
422 (% class="box infomessage" %)
423 (((
424 (((
425 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
426 )))
427 )))
428
429
430 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
431
432 **LT22222-L**: This mode the DI1 is used as a counting pin.
433
434 [[image:image-20220523181246-5.png]]
435
436 (((
437 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
438 )))
439
440 [[image:image-20220523181301-6.png]]
441
442 * RO is for relay. ROx=1 : close，ROx=0 always open.
443 * FIRST: Indicate this is the first packet after join network.
444 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
445
446 (((
447 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
448 )))
449
450 (((
451 **To use counting mode, please run:**
452 )))
453
454 (% class="box infomessage" %)
455 (((
456 (((
457 **AT+MOD=3**
458 )))
459 )))
460
461 (% class="box infomessage" %)
462 (((
463 (((
464 **ATZ**
465 )))
466 )))
467
468 (((
469 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
470
471
472 )))
473
474 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
475
476 **LT22222-L**: This mode the DI1 is used as a counting pin.
477
478 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.
479
480 [[image:image-20220523181903-8.png]]
481
482 (((
483 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
484 )))
485
486 [[image:image-20220523181727-7.png]]
487
488 * RO is for relay. ROx=1 : close，ROx=0 always open.
489 * FIRST: Indicate this is the first packet after join network.
490 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
491
492 (((
493 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
494 )))
495
496 (((
497 **To use this mode, please run:**
498 )))
499
500 (% class="box infomessage" %)
501 (((
502 (((
503 **AT+MOD=4**
504 )))
505 )))
506
507 (% class="box infomessage" %)
508 (((
509 (((
510 **ATZ**
511 )))
512 )))
513
514 (((
515
516 )))
517
518 (((
519 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
520 )))
521
522 (((
523 **Plus below command for AVI1 Counting:**
524 )))
525
526 (% class="box infomessage" %)
527 (((
528 (((
529 **AT+SETCNT=3,60   (set AVI Count to 60)**
530 )))
531 )))
532
533 (% class="box infomessage" %)
534 (((
535 (((
536 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
537 )))
538 )))
539
540 (% class="box infomessage" %)
541 (((
542 (((
543 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
544 )))
545 )))
546
547 (% class="box infomessage" %)
548 (((
549 (((
550 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
551 )))
552 )))
553
554
555 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
556
557 **LT22222-L**: This mode the DI1 is used as a counting pin.
558
559 [[image:image-20220523182334-9.png]]
560
561 (((
562 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
563 )))
564
565 * RO is for relay. ROx=1 : close，ROx=0 always open.
566 * FIRST: Indicate this is the first packet after join network.
567 * (((
568 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
569 )))
570
571 (((
572 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
573 )))
574
575 (((
576 **To use this mode, please run:**
577 )))
578
579 (% class="box infomessage" %)
580 (((
581 (((
582 **AT+MOD=5**
583 )))
584 )))
585
586 (% class="box infomessage" %)
587 (((
588 (((
589 **ATZ**
590 )))
591 )))
592
593 (((
594 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
595
596
597 )))
598
599 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
600
601 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
602
603 For example, if user has configured below commands:
604
605 * **AT+MOD=1 ** **~-~->** The normal working mode
606 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
607
608 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
609
610 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
611 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.**
612
613 **AT Command to set Trigger Condition**:
614
615 (% style="color:#4f81bd" %)**Trigger base on voltage**:
616
617 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
618
619 **Example:**
620
621 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)
622
623 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
624
625
626 (% style="color:#4f81bd" %)**Trigger base on current**:
627
628 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
629
630 **Example:**
631
632 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
633
634
635 (% style="color:#4f81bd" %)**Trigger base on DI status**:
636
637 DI status trigger Flag.
638
639 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
640
641 **Example:**
642
643 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
644
645
646 **Downlink Command to set Trigger Condition**
647
648 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
649
650 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
651
652 AA: Code for this downlink Command:
653
654 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
655
656 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
657
658 yy2 yy2: AC1 or AV1 high limit.
659
660 yy3 yy3: AC2 or AV2 low limit.
661
662 Yy4 yy4: AC2 or AV2 high limit.
663
664 **Example1**: AA 00 13 88 00 00 00 00 00 00
665
666 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
667
668 **Example2**: AA 02 01 00
669
670 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
671
672 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
673
674 MOD6 Payload : total 11 bytes payload
675
676 [[image:image-20220524085923-1.png]]
677
678 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
679
680 [[image:image-20220524090106-2.png]]
681
682 * Each bits shows if the corresponding trigger has been configured.
683
684 **Example:**
685
686 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
687
688
689 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
690
691 [[image:image-20220524090249-3.png]]
692
693 * Each bits shows which status has been trigger on this uplink.
694
695 **Example:**
696
697 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
698
699
700 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
701
702 [[image:image-20220524090456-4.png]]
703
704 * Each bits shows which status has been trigger on this uplink.
705
706 **Example:**
707
708 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
709
710 00000101: Means both DI1 and DI2 trigger are enabled.
711
712
713 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
714
715 Downlink command to poll MOD6 status:
716
717 **AB 06**
718
719 When device got this command, it will send the MOD6 payload.
720
721
722 === 3.3.7 Payload Decoder ===
723
724 (((
725 **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/]]
726
727
728 )))
729
730 == 3.4 ​Configure LT via AT or Downlink ==
731
732 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
733
734 (((
735 There are two kinds of Commands:
736 )))
737
738 * (% 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]]
739
740 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
741
742 === 3.4.1 Common Commands ===
743
744 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]]
745
746
747 === 3.4.2 Sensor related commands ===
748
749 ==== 3.4.2.1 Set Transmit Interval ====
750
751 Set device uplink interval.
752
753 * AT Command:
754
755 (% class="box infomessage" %)
756 (((
757 **AT+TDC=N **
758 )))
759
760 **Example: **AT+TDC=30000. Means set interval to 30 seconds
761
762 * Downlink Payload (prefix 0x01):
763
764 (% class="box infomessage" %)
765 (((
766 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
767 )))
768
769
770 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
771
772 Set work mode.
773
774 * AT Command:
775
776 (% class="box infomessage" %)
777 (((
778 **AT+MOD=N  **
779 )))
780
781 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
782
783 * Downlink Payload (prefix 0x0A):
784
785 (% class="box infomessage" %)
786 (((
787 **0x0A aa     ~/~/ Same as AT+MOD=aa**
788 )))
789
790
791 ==== 3.4.2.3 Poll an uplink ====
792
793 * AT Command:
794
795 There is no AT Command to poll uplink
796
797 * Downlink Payload (prefix 0x08):
798
799 (% class="box infomessage" %)
800 (((
801 **0x08 FF     ~/~/ Poll an uplink,**
802 )))
803
804 **Example**: 0x08FF, ask device to send an Uplink
805
806
807 ==== 3.4.2.4 Enable Trigger Mode ====
808
809 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
810
811 * AT Command:
812
813 (% class="box infomessage" %)
814 (((
815 **AT+ADDMOD6=1 or 0**
816 )))
817
818 1: Enable Trigger Mode
819
820 0: Disable Trigger Mode
821
822 * Downlink Payload (prefix 0x0A 06):
823
824 (% class="box infomessage" %)
825 (((
826 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
827 )))
828
829
830 ==== 3.4.2.5 Poll trigger settings ====
831
832 Poll trigger settings,
833
834 * AT Command:
835
836 There is no AT Command for this feature.
837
838 * Downlink Payload (prefix 0x AB 06):
839
840 (% class="box infomessage" %)
841 (((
842 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
843 )))
844
845
846 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
847
848 Enable Disable DI1/DI2/DI2 as trigger,
849
850 * AT Command:
851
852 (% class="box infomessage" %)
853 (((
854 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
855 )))
856
857 **Example:**
858
859 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
860
861 * Downlink Payload (prefix 0xAA 02):
862
863 (% class="box infomessage" %)
864 (((
865 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
866 )))
867
868
869 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
870
871 Set DI1 or DI3(for LT-33222-L) trigger.
872
873 * AT Command:
874
875 (% class="box infomessage" %)
876 (((
877 **AT+TRIG1=a,b**
878 )))
879
880 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
881
882 b : delay timing.
883
884 **Example:**
885
886 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
887
888 * Downlink Payload (prefix 0x09 01 ):
889
890 (% class="box infomessage" %)
891 (((
892 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
893 )))
894
895
896 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
897
898 Set DI2 trigger.
899
900 * AT Command:
901
902 (% class="box infomessage" %)
903 (((
904 **AT+TRIG2=a,b**
905 )))
906
907 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
908
909 b : delay timing.
910
911 **Example:**
912
913 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
914
915 * Downlink Payload (prefix 0x09 02 ):
916
917 (% class="box infomessage" %)
918 (((
919 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
920 )))
921
922
923 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
924
925 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
926
927 * AT Command:
928
929 (% class="box infomessage" %)
930 (((
931 **AT+ACLIM. **
932 )))
933
934 * Downlink Payload (prefix 0xAA 01 ):
935
936 (% class="box infomessage" %)
937 (((
938 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
939 )))
940
941
942 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
943
944 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
945
946 * AT Command:
947
948 (% class="box infomessage" %)
949 (((
950 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
951 )))
952
953 * Downlink Payload (prefix 0xAA 00 ):
954
955 (% class="box infomessage" %)
956 (((
957 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
958 )))
959
960
961 ==== 3.4.2.11 Trigger – Set minimum interval ====
962
963 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
964
965 * AT Command:
966
967 (% class="box infomessage" %)
968 (((
969 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
970 )))
971
972 * Downlink Payload (prefix 0xAC ):
973
974 (% class="box infomessage" %)
975 (((
976 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
977 )))
978
979
980 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
981
982 * AT Command:
983
984 There is no AT Command to control Digital Output
985
986 * Downlink Payload (prefix 0x02):
987
988 (% class="box infomessage" %)
989 (((
990 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
991 )))
992
993 (((
994 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
995 )))
996
997 (((
998 01: Low,  00: High ,  11: No action
999 )))
1000
1001 [[image:image-20220524092754-5.png]]
1002
1003 (((
1004 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1005 )))
1006
1007 (((
1008 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1009 )))
1010
1011
1012 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1013
1014 * AT Command:
1015
1016 There is no AT Command to control Digital Output
1017
1018 * Downlink Payload (prefix 0xA9):
1019
1020 (% class="box infomessage" %)
1021 (((
1022 (((
1023 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1024 )))
1025 )))
1026
1027 This is to control the digital output time of DO pin. Include four bytes:
1028
1029 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1030
1031 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1032
1033 01: DO pins will change back to original state after timeout.
1034
1035 00: DO pins will change to an inverter state after timeout 
1036
1037 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1038
1039 [[image:image-20220524093238-6.png]]
1040
1041 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1042
1043 [[image:image-20220524093328-7.png]]
1044
1045 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1046
1047 [[image:image-20220524093351-8.png]]
1048
1049 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1050
1051 Latching time. Unit: ms
1052
1053 Device will upload a packet if downlink code executes successfully.
1054
1055 **Example payload:**
1056
1057 **~1. A9 01 01 01 01 07 D0**
1058
1059 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1060
1061 **2. A9 01 00 01 11 07 D0**
1062
1063 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1064
1065 **3. A9 00 00 00 00 07 D0**
1066
1067 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1068
1069 **4. A9 00 11 01 00 07 D0**
1070
1071 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
1072
1073
1074 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1075
1076 * AT Command:
1077
1078 There is no AT Command to control Relay Output
1079
1080 * Downlink Payload (prefix 0x03):
1081
1082 (% class="box infomessage" %)
1083 (((
1084 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1085 )))
1086
1087 (((
1088 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1089 )))
1090
1091 (((
1092 01: Close ,  00: Open , 11: No action
1093 )))
1094
1095 (((
1096 [[image:image-20220524093724-9.png]]
1097 )))
1098
1099 Device will upload a packet if downlink code executes successfully.
1100
1101
1102 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1103
1104 * AT Command:
1105
1106 There is no AT Command to control Relay Output
1107
1108 * Downlink Payload (prefix 0x05):
1109
1110 (% class="box infomessage" %)
1111 (((
1112 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1113 )))
1114
1115 This is to control the relay output time of relay. Include four bytes:
1116
1117 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1118
1119 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1120
1121 01: Relays will change back to original state after timeout.
1122
1123 00: Relays will change to an inverter state after timeout
1124
1125 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1126
1127 [[image:image-20220524093831-10.png]]
1128
1129 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1130
1131 Device will upload a packet if downlink code executes successfully.
1132
1133 **Example payload:**
1134
1135 **~1. 05 01 11 07 D0**
1136
1137 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1138
1139 **2. 05 01 10 07 D0**
1140
1141 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1142
1143 **3. 05 00 01 07 D0**
1144
1145 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1146
1147 **4. 05 00 00 07 D0**
1148
1149 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1150
1151
1152 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1153
1154 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1155
1156 * AT Command:
1157
1158 (% class="box infomessage" %)
1159 (((
1160 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1161 )))
1162
1163 * Downlink Payload (prefix 0xA5):
1164
1165 (% class="box infomessage" %)
1166 (((
1167 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1168 )))
1169
1170
1171 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1172
1173 * AT Command:
1174
1175 (% class="box infomessage" %)
1176 (((
1177 **AT+SETCNT=aa,(bb cc dd ee) **
1178 )))
1179
1180 aa: 1: Set count1,
1181
1182 2: Set count2,
1183
1184 3: Set AV1 count
1185
1186 Bb cc dd ee: number to be set
1187
1188 * Downlink Payload (prefix 0xA8):
1189
1190 (% class="box infomessage" %)
1191 (((
1192 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1193 )))
1194
1195
1196 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1197
1198 Clear counting for counting mode
1199
1200 * AT Command:
1201
1202 (% class="box infomessage" %)
1203 (((
1204 **AT+CLRCOUNT ~/~/ clear all counting**
1205 )))
1206
1207 * Downlink Payload (prefix 0xA6):
1208
1209 (% class="box infomessage" %)
1210 (((
1211 **0x A6 01     ~/~/ clear all counting,**
1212 )))
1213
1214
1215 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1216
1217 * AT Command:
1218
1219 (% class="box infomessage" %)
1220 (((
1221 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1222 )))
1223
1224 * Downlink Payload (prefix 0xA7):
1225
1226 (% class="box infomessage" %)
1227 (((
1228 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1229 )))
1230
1231 (((
1232 range: aa bb cc:0 to 16777215,  (unit:second)
1233
1234
1235 )))
1236
1237 == 3.5 Integrate with Mydevice ==
1238
1239 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:
1240
1241 (((
1242 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1243 )))
1244
1245 (((
1246 **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:
1247 )))
1248
1249 [[image:1653356737703-362.png||height="232" width="732"]]
1250
1251 [[image:image-20220524094641-11.png||height="390" width="723"]]
1252
1253 [[image:image-20220524094641-12.png||height="402" width="718"]]
1254
1255
1256 **Step 3**: Create an account or log in Mydevices.
1257
1258 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1259
1260 Search under The things network
1261
1262 [[image:1653356838789-523.png||height="337" width="740"]]
1263
1264
1265 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1266
1267 [[image:image-20220524094909-1.png||height="335" width="729"]]
1268
1269 [[image:image-20220524094909-2.png||height="337" width="729"]]
1270
1271 [[image:image-20220524094909-3.png||height="338" width="727"]]
1272
1273 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1274
1275 [[image:image-20220524094909-5.png||height="341" width="734"]]
1276
1277
1278 == 3.6 Interface Detail ==
1279
1280 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1281
1282 Support NPN Type sensor
1283
1284 [[image:1653356991268-289.png]]
1285
1286
1287 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1288
1289 (((
1290 The DI port of LT-22222-L can support NPN or PNP output sensor.
1291 )))
1292
1293 (((
1294 (((
1295 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
1296 )))
1297 )))
1298
1299 [[image:1653357170703-587.png]]
1300
1301 (((
1302 (((
1303 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1304 )))
1305 )))
1306
1307 (((
1308
1309 )))
1310
1311 (((
1312 **Example1**: Connect to a Low active sensor.
1313 )))
1314
1315 (((
1316 This type of sensor will output a low signal GND when active.
1317 )))
1318
1319 * (((
1320 Connect sensor’s output to DI1-
1321 )))
1322 * (((
1323 Connect sensor’s VCC to DI1+.
1324 )))
1325
1326 (((
1327 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1328 )))
1329
1330 (((
1331 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1332 )))
1333
1334 (((
1335 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.
1336 )))
1337
1338 (((
1339
1340 )))
1341
1342 (((
1343 **Example2**: Connect to a High active sensor.
1344 )))
1345
1346 (((
1347 This type of sensor will output a high signal (example 24v) when active.
1348 )))
1349
1350 * (((
1351 Connect sensor’s output to DI1+
1352 )))
1353 * (((
1354 Connect sensor’s GND DI1-.
1355 )))
1356
1357 (((
1358 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1359 )))
1360
1361 (((
1362 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1363 )))
1364
1365 (((
1366 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.
1367 )))
1368
1369 (((
1370
1371 )))
1372
1373 (((
1374 **Example3**: Connect to a 220v high active sensor.
1375 )))
1376
1377 (((
1378 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1379 )))
1380
1381 * (((
1382 Connect sensor’s output to DI1+ with a serial 50K resistor
1383 )))
1384 * (((
1385 Connect sensor’s GND DI1-.
1386 )))
1387
1388 (((
1389 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1390 )))
1391
1392 (((
1393 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1394 )))
1395
1396 (((
1397 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.
1398 )))
1399
1400
1401 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1402
1403 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1404
1405 [[image:1653357531600-905.png]]
1406
1407
1408 === 3.6.4 Analog Input Interface ===
1409
1410 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:
1411
1412 **AC2 = (IN2 voltage )/12**
1413
1414 [[image:1653357592296-182.png]]
1415
1416 Example to connect a 4~~20mA sensor
1417
1418 We take the wind speed sensor as an example for reference only.
1419
1420 Specifications of the wind speed sensor:
1421
1422 Red:12~~24v
1423
1424 Yellow:4~~20mA
1425
1426 Black:GND
1427
1428
1429 Connection diagram:
1430
1431 [[image:1653357640609-758.png]]
1432
1433 [[image:1653357648330-671.png||height="155" width="733"]]
1434
1435
1436 === 3.6.5 Relay Output ===
1437
1438 (((
1439 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:
1440 )))
1441
1442 [[image:image-20220524100215-9.png]]
1443
1444 [[image:image-20220524100215-10.png||height="382" width="723"]]
1445
1446
1447 == 3.7 LEDs Indicators ==
1448
1449 [[image:image-20220524100748-11.png]]
1450
1451
1452 = 4. Use AT Command =
1453
1454 == 4.1 Access AT Command ==
1455
1456 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.
1457
1458 [[image:1653358238933-385.png]]
1459
1460 (((
1461 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:
1462 )))
1463
1464 [[image:1653358355238-883.png]]
1465
1466 (((
1467 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/]]
1468 )))
1469
1470 (((
1471 AT+<CMD>?        : Help on <CMD>
1472 )))
1473
1474 (((
1475 AT+<CMD>         : Run <CMD>
1476 )))
1477
1478 (((
1479 AT+<CMD>=<value> : Set the value
1480 )))
1481
1482 (((
1483 AT+<CMD>=?       : Get the value
1484 )))
1485
1486 (((
1487 ATZ: Trig a reset of the MCU
1488 )))
1489
1490 (((
1491 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1492 )))
1493
1494 (((
1495 AT+DEUI: Get or Set the Device EUI
1496 )))
1497
1498 (((
1499 AT+DADDR: Get or Set the Device Address
1500 )))
1501
1502 (((
1503 AT+APPKEY: Get or Set the Application Key
1504 )))
1505
1506 (((
1507 AT+NWKSKEY: Get or Set the Network Session Key
1508 )))
1509
1510 (((
1511 AT+APPSKEY: Get or Set the Application Session Key
1512 )))
1513
1514 (((
1515 AT+APPEUI: Get or Set the Application EUI
1516 )))
1517
1518 (((
1519 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1520 )))
1521
1522 (((
1523 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1524 )))
1525
1526 (((
1527 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1528 )))
1529
1530 (((
1531 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1532 )))
1533
1534 (((
1535 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1536 )))
1537
1538 (((
1539 AT+RX2FQ: Get or Set the Rx2 window frequency
1540 )))
1541
1542 (((
1543 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1544 )))
1545
1546 (((
1547 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1548 )))
1549
1550 (((
1551 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1552 )))
1553
1554 (((
1555 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1556 )))
1557
1558 (((
1559 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1560 )))
1561
1562 (((
1563 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1564 )))
1565
1566 (((
1567 AT+NWKID: Get or Set the Network ID
1568 )))
1569
1570 (((
1571 AT+FCU: Get or Set the Frame Counter Uplink
1572 )))
1573
1574 (((
1575 AT+FCD: Get or Set the Frame Counter Downlink
1576 )))
1577
1578 (((
1579 AT+CLASS: Get or Set the Device Class
1580 )))
1581
1582 (((
1583 AT+JOIN: Join network
1584 )))
1585
1586 (((
1587 AT+NJS: Get OTAA Join Status
1588 )))
1589
1590 (((
1591 AT+SENDB: Send hexadecimal data along with the application port
1592 )))
1593
1594 (((
1595 AT+SEND: Send text data along with the application port
1596 )))
1597
1598 (((
1599 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1600 )))
1601
1602 (((
1603 AT+RECV: Print last received data in raw format
1604 )))
1605
1606 (((
1607 AT+VER: Get current image version and Frequency Band
1608 )))
1609
1610 (((
1611 AT+CFM: Get or Set the confirmation mode (0-1)
1612 )))
1613
1614 (((
1615 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1616 )))
1617
1618 (((
1619 AT+SNR: Get the SNR of the last received packet
1620 )))
1621
1622 (((
1623 AT+RSSI: Get the RSSI of the last received packet
1624 )))
1625
1626 (((
1627 AT+TDC: Get or set the application data transmission interval in ms
1628 )))
1629
1630 (((
1631 AT+PORT: Get or set the application port
1632 )))
1633
1634 (((
1635 AT+DISAT: Disable AT commands
1636 )))
1637
1638 (((
1639 AT+PWORD: Set password, max 9 digits
1640 )))
1641
1642 (((
1643 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1644 )))
1645
1646 (((
1647 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1648 )))
1649
1650 (((
1651 AT+CFG: Print all settings
1652
1653
1654 )))
1655
1656 == 4.2 Common AT Command Sequence ==
1657
1658 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1659
1660 (((
1661 If device has not joined network yet:
1662 )))
1663
1664 (((
1665 (% style="background-color:#dcdcdc" %)123456
1666 )))
1667
1668 (((
1669 (% style="background-color:#dcdcdc" %)AT+FDR
1670 )))
1671
1672 (((
1673 (% style="background-color:#dcdcdc" %)123456
1674 )))
1675
1676 (((
1677 (% style="background-color:#dcdcdc" %)AT+NJM=0
1678 )))
1679
1680 (((
1681 (% style="background-color:#dcdcdc" %)ATZ
1682 )))
1683
1684
1685 (((
1686 If device already joined network:
1687 )))
1688
1689 (((
1690 (% style="background-color:#dcdcdc" %)AT+NJM=0
1691 )))
1692
1693 (((
1694 (% style="background-color:#dcdcdc" %)ATZ
1695
1696
1697 )))
1698
1699 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1700
1701 (((
1702 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1703 )))
1704
1705 (((
1706 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1707 )))
1708
1709 (((
1710 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1711 )))
1712
1713 (((
1714 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1715 )))
1716
1717 (((
1718 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1719 )))
1720
1721 (((
1722 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1723 )))
1724
1725 (((
1726 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1727 )))
1728
1729 (((
1730 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1731 )))
1732
1733 (((
1734 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1735 )))
1736
1737 (((
1738 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1739 )))
1740
1741 (((
1742 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1743 )))
1744
1745 (((
1746 (% 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.
1747 )))
1748
1749 (((
1750 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1751 )))
1752
1753 (((
1754 (% style="color:red" %)**Note:**
1755 )))
1756
1757 (((
1758 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1759 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1760 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.
1761 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
1762 )))
1763
1764 (((
1765 [[image:1653359097980-169.png||height="188" width="729"]]
1766 )))
1767
1768 (((
1769
1770 )))
1771
1772 === 4.2.3 Change to Class A ===
1773
1774 If sensor JOINED
1775 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1776 ATZ
1777
1778
1779 = 5. FAQ =
1780
1781 == 5.1 How to upgrade the image? ==
1782
1783 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1784
1785 * Support new features
1786 * For bug fix
1787 * Change LoRaWAN bands.
1788 Below shows the hardware connection for how to upload an image to the LT:
1789 * [[image:1653359603330-121.png]]
1790
1791 (((
1792 **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]].
1793 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1794 **Step3: **Open flashloader; choose the correct COM port to update.
1795 **For LT-22222-L**:
1796 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.
1797 )))
1798
1799 [[image:image-20220524103407-12.png]]
1800
1801 [[image:image-20220524103429-13.png]]
1802
1803 [[image:image-20220524104033-15.png]]
1804
1805 (% 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:
1806
1807 [[image:1653360054704-518.png||height="186" width="745"]]
1808
1809
1810 (((
1811 (((
1812 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1813 )))
1814 )))
1815
1816 (((
1817 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1818
1819
1820 )))
1821
1822 (((
1823 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1824 )))
1825
1826 (((
1827 (((
1828 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1829 )))
1830 )))
1831
1832 (((
1833 (((
1834 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1835 )))
1836 )))
1837
1838 (((
1839 (% 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.
1840 )))
1841
1842 (((
1843 [[image:1653360231087-571.png||height="401" width="727"]]
1844 )))
1845
1846 (((
1847 (% 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.
1848 )))
1849
1850 (((
1851 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1852 )))
1853
1854 (((
1855 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1856 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1857 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1858 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1859 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1860 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1861 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1862 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1863 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1864 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1865 )))
1866
1867 (((
1868 As shown in below:
1869 )))
1870
1871 [[image:1653360498588-932.png||height="485" width="726"]]
1872
1873
1874 == 5.4 Can I see counting event in Serial? ==
1875
1876 (((
1877 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.
1878
1879
1880 == 5.5 Can i use point to point communication for LT-22222-L? ==
1881
1882 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1883
1884
1885 )))
1886
1887 (((
1888 = 6. Trouble Shooting =
1889 )))
1890
1891 (((
1892 (((
1893 == 6.1 Downlink doesn’t work, how to solve it? ==
1894 )))
1895 )))
1896
1897 (((
1898 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1899
1900
1901 )))
1902
1903 (((
1904 == 6.2 Have trouble to upload image. ==
1905 )))
1906
1907 (((
1908 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1909 )))
1910
1911 (((
1912
1913 )))
1914
1915 (((
1916 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1917 )))
1918
1919 (((
1920 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1921 )))
1922
1923 (((
1924
1925 )))
1926
1927 (((
1928 = 7. Order Info =
1929 )))
1930
1931 (((
1932 (((
1933 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1934 )))
1935 )))
1936
1937 (((
1938 (((
1939 (% style="color:#4f81bd" %)**XXX:**
1940 )))
1941 )))
1942
1943 (((
1944 * (((
1945 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1946 )))
1947 )))
1948
1949 (((
1950 * (((
1951 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1952 )))
1953 )))
1954
1955 (((
1956 * (((
1957 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1958 )))
1959 )))
1960
1961 (((
1962 * (((
1963 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1964 )))
1965 )))
1966
1967 (((
1968 * (((
1969 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1970 )))
1971 )))
1972
1973 (((
1974 * (((
1975 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1976 )))
1977 )))
1978
1979 (((
1980 * (((
1981 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1982 )))
1983 )))
1984
1985 (((
1986 * (((
1987 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1988 )))
1989 )))
1990
1991 (((
1992 * (((
1993 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1994
1995
1996 )))
1997
1998 = 8. Packing Info =
1999 )))
2000
2001 (((
2002 (((
2003 **Package Includes**:
2004 )))
2005 )))
2006
2007 (((
2008 (((
2009 * LT-22222-L I/O Controller x 1
2010 * Stick Antenna for LoRa RF part x 1
2011 * Bracket for controller x1
2012 * Program cable x 1
2013 )))
2014 )))
2015
2016 (((
2017 (((
2018 **Dimension and weight**:
2019 )))
2020 )))
2021
2022 (((
2023 (((
2024 * Device Size: 13.5 x 7 x 3 cm
2025 * Device Weight: 105g
2026 * Package Size / pcs : 14.5 x 8 x 5 cm
2027 * Weight / pcs : 170g
2028
2029
2030 )))
2031 )))
2032
2033 (((
2034 = 9. Support =
2035 )))
2036
2037 * (((
2038 (((
2039 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.
2040 )))
2041 )))
2042 * (((
2043 (((
2044 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
2045 )))
2046 )))
2047
2048 (((
2049 (((
2050 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2051
2052
2053 )))
2054
2055 (((
2056 = 10. Reference​​​​​ =
2057
2058 * Product Page:
2059
2060 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]]
2061
2062 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2063 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2064 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2065 )))
2066 )))