Version 77.14 by Xiaoling on 2022/06/10 08:39
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1 (% style="text-align:center" %)
2 [[image:image-20220523163353-1.jpeg||height="604" width="500"]]
3
4 **LT-22222-L LoRa IO Controller User Manual **
5
6
7 **Table of Contents:**
8
9 {{toc/}}
10
11
12
13
14
15
16
17 = 1.Introduction =
18
19 == 1.1 What is LT Series I/O Controller ==
20
21 (((
22 The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
23 )))
24
25 (((
26 The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
27 )))
28
29 (((
30 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
31 )))
32
33 (((
34 The use environment includes:
35 )))
36
37 (((
38 1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.
39 )))
40
41 (((
42 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
43 )))
44
45 (((
46 [[image:1653295757274-912.png]]
47
48
49 )))
50
51 == 1.2  Specifications ==
52
53 (((
54
55
56 **Hardware System:**
57 )))
58
59 * (((
60 STM32L072CZT6 MCU
61 )))
62 * (((
63 SX1276/78 Wireless Chip 
64 )))
65 * (((
66 (((
67 Power Consumption:
68 )))
69
70 * (((
71 Idle: 4mA@12v
72 )))
73 * (((
74 20dB Transmit: 34mA@12v
75 )))
76 )))
77
78
79 (((
80 **Interface for Model: LT22222-L:**
81 )))
82
83 * (((
84 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
85 )))
86 * (((
87 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
88 )))
89 * (((
90 2 x Relay Output (5A@250VAC / 30VDC)
91 )))
92 * (((
93 2 x 0~~20mA Analog Input (res:0.01mA)
94 )))
95 * (((
96 2 x 0~~30V Analog Input (res:0.01v)
97 )))
98 * (((
99 Power Input 7~~ 24V DC. 
100 )))
101
102
103 (((
104 **LoRa Spec:**
105 )))
106
107 * (((
108 (((
109 Frequency Range:
110 )))
111
112 * (((
113 Band 1 (HF): 862 ~~ 1020 Mhz
114 )))
115 * (((
116 Band 2 (LF): 410 ~~ 528 Mhz
117 )))
118 )))
119 * (((
120 168 dB maximum link budget.
121 )))
122 * (((
123 +20 dBm - 100 mW constant RF output vs.
124 )))
125 * (((
126 +14 dBm high efficiency PA.
127 )))
128 * (((
129 Programmable bit rate up to 300 kbps.
130 )))
131 * (((
132 High sensitivity: down to -148 dBm.
133 )))
134 * (((
135 Bullet-proof front end: IIP3 = -12.5 dBm.
136 )))
137 * (((
138 Excellent blocking immunity.
139 )))
140 * (((
141 Low RX current of 10.3 mA, 200 nA register retention.
142 )))
143 * (((
144 Fully integrated synthesizer with a resolution of 61 Hz.
145 )))
146 * (((
147 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
148 )))
149 * (((
150 Built-in bit synchronizer for clock recovery.
151 )))
152 * (((
153 Preamble detection.
154 )))
155 * (((
156 127 dB Dynamic Range RSSI.
157 )))
158 * (((
159 Automatic RF Sense and CAD with ultra-fast AFC.
160 )))
161 * (((
162 Packet engine up to 256 bytes with CRC.
163
164
165 )))
166
167
168
169 == 1.3 Features ==
170
171 * LoRaWAN Class A & Class C protocol
172 * Optional Customized LoRa Protocol
173 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
174 * AT Commands to change parameters
175 * Remote configure parameters via LoRa Downlink
176 * Firmware upgradable via program port
177 * Counting
178
179
180
181 == 1.4  Applications ==
182
183 * Smart Buildings & Home Automation
184 * Logistics and Supply Chain Management
185 * Smart Metering
186 * Smart Agriculture
187 * Smart Cities
188 * Smart Factory
189
190
191
192 == 1.5 Hardware Variants ==
193
194 (% border="1" style="background-color:#f7faff; width:500px" %)
195 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
196 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
197 * 2 x Digital Input (Bi-direction)
198 * 2 x Digital Output
199 * 2 x Relay Output (5A@250VAC / 30VDC)
200 * 2 x 0~~20mA Analog Input (res:0.01mA)
201 * 2 x 0~~30V Analog Input (res:0.01v)
202 * 1 x Counting Port
203 )))
204
205
206
207 = 2. Power ON Device =
208
209 The LT controller can be powered by 7 ~~ 24V DC power source. Connect VIN to Power Input V+ and GND to power input V- to power the LT controller.
210
211 (((
212 PWR will on when device is properly powered.
213 )))
214
215 [[image:1653297104069-180.png]]
216
217
218
219 = 3. Operation Mode =
220
221 == 3.1 How it works? ==
222
223 (((
224 The LT is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the LT. It will auto join the network via OTAA. For LT-22222-L, the LED will show the Join status: After power on **TX LED** will fast blink 5 times, LT-22222-L will enter working mode and start to JOIN LoRaWAN network. **TX LED** will be on for 5 seconds after joined in network. When there is message from server, the **RX LED** will be on for 1 second. 
225 )))
226
227 (((
228 In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>||anchor="H4.UseATCommand"]] to set the keys in the devices.
229
230
231 )))
232
233
234
235 == 3.2 Example to join LoRaWAN network ==
236
237 (((
238 This chapter shows an example for how to join the TTN LoRaWAN Network. Below is the network structure, we use our LG308 as LoRaWAN gateway here. 
239 )))
240
241 [[image:image-20220523172350-1.png||height="266" width="864"]]
242
243 (((
244 The LG308 is already set to connect to [[TTN network >>url:https://www.thethingsnetwork.org/]]. So what we need to do now is only configure register this device to TTN:
245 )))
246
247 (((
248 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
249 )))
250
251 (((
252 Each LT is shipped with a sticker with the default device EUI as below:
253 )))
254
255 [[image:1653297924498-393.png]]
256
257 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
258
259 Add APP EUI in the application.
260
261 [[image:1653297955910-247.png||height="321" width="716"]]
262
263
264 Add APP KEY and DEV EUI
265
266 [[image:1653298023685-319.png]]
267
268
269 (((
270 **Step 2**: Power on LT and it will auto join to the TTN network. After join success, it will start to upload message to TTN and user can see in the panel.
271 )))
272
273 [[image:1653298044601-602.png||height="405" width="709"]]
274
275
276
277 == 3.3 Uplink Payload ==
278
279 There are five working modes + one interrupt mode on LT for different type application:
280
281 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
282 * **MOD2**: Double DI Counting + DO + RO
283 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
284 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
285 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
286 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
287
288
289
290 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
291
292 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
293
294 [[image:image-20220523174024-3.png]]
295
296 (((
297 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
298 )))
299
300 [[image:image-20220523174254-4.png]]
301
302 * RO is for relay. ROx=1 : close，ROx=0 always open.
303 * DI is for digital input. DIx=1: high or float, DIx=0: low.
304 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
305
306 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
307
308 For example if payload is: [[image:image-20220523175847-2.png]]
309
310 **The value for the interface is:  **
311
312 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
313
314 AVI2 channel voltage is 0x04AC/1000=1.196V
315
316 ACI1 channel current is 0x1310/1000=4.880mA
317
318 ACI2 channel current is 0x1300/1000=4.864mA
319
320 The last byte 0xAA= 10101010(B) means
321
322 * [1] RO1 relay channel is close and the RO1 LED is ON.
323 * [0] RO2 relay channel is open and RO2 LED is OFF;
324
325
326 **LT22222-L:**
327
328 * [1] DI2 channel is high input and DI2 LED is ON;
329 * [0] DI1 channel is low input;
330
331 * [0] DO3 channel output state
332 ** DO3 is float in case no load between DO3 and V+.;
333 ** DO3 is high in case there is load between DO3 and V+.
334 ** DO3 LED is off in both case
335 * [1] DO2 channel output is low and DO2 LED is ON.
336 * [0] DO1 channel output state
337 ** DO1 is float in case no load between DO1 and V+.;
338 ** DO1 is high in case there is load between DO1 and V+.
339 ** DO1 LED is off in both case
340
341
342
343 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
344
345 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
346
347 (((
348 Total : 11 bytes payload
349 )))
350
351 [[image:image-20220523180452-3.png]]
352
353 (((
354 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
355 )))
356
357 [[image:image-20220523180506-4.png]]
358
359 * RO is for relay. ROx=1 : close，ROx=0 always open.
360 * FIRST: Indicate this is the first packet after join network.
361 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
362
363 (((
364 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
365 )))
366
367 (((
368 **To use counting mode, please run:**
369 )))
370
371 (% class="box infomessage" %)
372 (((
373 (((
374 **AT+MOD=2**
375 )))
376 )))
377
378 (% class="box infomessage" %)
379 (((
380 (((
381 **ATZ**
382 )))
383 )))
384
385 (((
386 (% style="color:#4f81bd" %)**AT Commands for counting:**
387 )))
388
389 (((
390 **For LT22222-L:**
391 )))
392
393 (% class="box infomessage" %)
394 (((
395 (((
396 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
397 )))
398 )))
399
400 (% class="box infomessage" %)
401 (((
402 (((
403 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
404 )))
405 )))
406
407 (% class="box infomessage" %)
408 (((
409 (((
410 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
411 )))
412 )))
413
414 (% class="box infomessage" %)
415 (((
416 (((
417 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
418 )))
419 )))
420
421 (% class="box infomessage" %)
422 (((
423 (((
424 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
425 )))
426 )))
427
428 (% class="box infomessage" %)
429 (((
430 (((
431 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
432 )))
433 )))
434
435
436
437 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
438
439 **LT22222-L**: This mode the DI1 is used as a counting pin.
440
441 [[image:image-20220523181246-5.png]]
442
443 (((
444 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
445 )))
446
447 [[image:image-20220523181301-6.png]]
448
449 * RO is for relay. ROx=1 : close，ROx=0 always open.
450 * FIRST: Indicate this is the first packet after join network.
451 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
452
453 (((
454 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
455 )))
456
457 (((
458 **To use counting mode, please run:**
459 )))
460
461 (% class="box infomessage" %)
462 (((
463 (((
464 **AT+MOD=3**
465 )))
466 )))
467
468 (% class="box infomessage" %)
469 (((
470 (((
471 **ATZ**
472 )))
473 )))
474
475 (((
476 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
477
478
479 )))
480
481
482
483 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
484
485 **LT22222-L**: This mode the DI1 is used as a counting pin.
486
487 The AVI1 is also used for counting. AVI1 is used to monitor the voltage. It will check the voltage **every 60s**, if voltage is higher or lower than VOLMAX mV, the AVI1 Counting increase 1, so AVI1 counting can be used to measure a machine working hour.
488
489 [[image:image-20220523181903-8.png]]
490
491 (((
492 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
493 )))
494
495 [[image:image-20220523181727-7.png]]
496
497 * RO is for relay. ROx=1 : close，ROx=0 always open.
498 * FIRST: Indicate this is the first packet after join network.
499 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
500
501 (((
502 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
503 )))
504
505 (((
506 **To use this mode, please run:**
507 )))
508
509 (% class="box infomessage" %)
510 (((
511 (((
512 **AT+MOD=4**
513 )))
514 )))
515
516 (% class="box infomessage" %)
517 (((
518 (((
519 **ATZ**
520 )))
521 )))
522
523 (((
524
525 )))
526
527 (((
528 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
529 )))
530
531 (((
532 **Plus below command for AVI1 Counting:**
533 )))
534
535 (% class="box infomessage" %)
536 (((
537 (((
538 **AT+SETCNT=3,60   (set AVI Count to 60)**
539 )))
540 )))
541
542 (% class="box infomessage" %)
543 (((
544 (((
545 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
546 )))
547 )))
548
549 (% class="box infomessage" %)
550 (((
551 (((
552 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
553 )))
554 )))
555
556 (% class="box infomessage" %)
557 (((
558 (((
559 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
560 )))
561 )))
562
563
564 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
565
566 **LT22222-L**: This mode the DI1 is used as a counting pin.
567
568 [[image:image-20220523182334-9.png]]
569
570 (((
571 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
572 )))
573
574 * RO is for relay. ROx=1 : close，ROx=0 always open.
575 * FIRST: Indicate this is the first packet after join network.
576 * (((
577 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
578 )))
579
580 (((
581 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
582 )))
583
584 (((
585 **To use this mode, please run:**
586 )))
587
588 (% class="box infomessage" %)
589 (((
590 (((
591 **AT+MOD=5**
592 )))
593 )))
594
595 (% class="box infomessage" %)
596 (((
597 (((
598 **ATZ**
599 )))
600 )))
601
602 (((
603 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
604
605
606 )))
607
608 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
609
610 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
611
612 For example, if user has configured below commands:
613
614 * **AT+MOD=1 ** **~-~->** The normal working mode
615 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
616
617 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
618
619 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
620 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.**
621
622 **AT Command to set Trigger Condition**:
623
624 (% style="color:#4f81bd" %)**Trigger base on voltage**:
625
626 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
627
628 **Example:**
629
630 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)
631
632 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
633
634
635 (% style="color:#4f81bd" %)**Trigger base on current**:
636
637 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
638
639 **Example:**
640
641 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
642
643
644 (% style="color:#4f81bd" %)**Trigger base on DI status**:
645
646 DI status trigger Flag.
647
648 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
649
650 **Example:**
651
652 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
653
654
655 **Downlink Command to set Trigger Condition**
656
657 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
658
659 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
660
661 AA: Code for this downlink Command:
662
663 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
664
665 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
666
667 yy2 yy2: AC1 or AV1 high limit.
668
669 yy3 yy3: AC2 or AV2 low limit.
670
671 Yy4 yy4: AC2 or AV2 high limit.
672
673 **Example1**: AA 00 13 88 00 00 00 00 00 00
674
675 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
676
677 **Example2**: AA 02 01 00
678
679 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
680
681 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
682
683 MOD6 Payload : total 11 bytes payload
684
685 [[image:image-20220524085923-1.png]]
686
687 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
688
689 [[image:image-20220524090106-2.png]]
690
691 * Each bits shows if the corresponding trigger has been configured.
692
693 **Example:**
694
695 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
696
697
698 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
699
700 [[image:image-20220524090249-3.png]]
701
702 * Each bits shows which status has been trigger on this uplink.
703
704 **Example:**
705
706 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
707
708
709 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
710
711 [[image:image-20220524090456-4.png]]
712
713 * Each bits shows which status has been trigger on this uplink.
714
715 **Example:**
716
717 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
718
719 00000101: Means both DI1 and DI2 trigger are enabled.
720
721
722 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
723
724 Downlink command to poll MOD6 status:
725
726 **AB 06**
727
728 When device got this command, it will send the MOD6 payload.
729
730
731 === 3.3.7 Payload Decoder ===
732
733 (((
734 **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/]]
735
736
737 )))
738
739 == 3.4 ​Configure LT via AT or Downlink ==
740
741 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
742
743 (((
744 There are two kinds of Commands:
745 )))
746
747 * (% 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]]
748
749 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
750
751 === 3.4.1 Common Commands ===
752
753 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]]
754
755
756 === 3.4.2 Sensor related commands ===
757
758 ==== 3.4.2.1 Set Transmit Interval ====
759
760 Set device uplink interval.
761
762 * AT Command:
763
764 (% class="box infomessage" %)
765 (((
766 **AT+TDC=N **
767 )))
768
769 **Example: **AT+TDC=30000. Means set interval to 30 seconds
770
771 * Downlink Payload (prefix 0x01):
772
773 (% class="box infomessage" %)
774 (((
775 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
776 )))
777
778
779 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
780
781 Set work mode.
782
783 * AT Command:
784
785 (% class="box infomessage" %)
786 (((
787 **AT+MOD=N  **
788 )))
789
790 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
791
792 * Downlink Payload (prefix 0x0A):
793
794 (% class="box infomessage" %)
795 (((
796 **0x0A aa     ~/~/ Same as AT+MOD=aa**
797 )))
798
799
800 ==== 3.4.2.3 Poll an uplink ====
801
802 * AT Command:
803
804 There is no AT Command to poll uplink
805
806 * Downlink Payload (prefix 0x08):
807
808 (% class="box infomessage" %)
809 (((
810 **0x08 FF     ~/~/ Poll an uplink,**
811 )))
812
813 **Example**: 0x08FF, ask device to send an Uplink
814
815
816 ==== 3.4.2.4 Enable Trigger Mode ====
817
818 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
819
820 * AT Command:
821
822 (% class="box infomessage" %)
823 (((
824 **AT+ADDMOD6=1 or 0**
825 )))
826
827 1: Enable Trigger Mode
828
829 0: Disable Trigger Mode
830
831 * Downlink Payload (prefix 0x0A 06):
832
833 (% class="box infomessage" %)
834 (((
835 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
836 )))
837
838
839 ==== 3.4.2.5 Poll trigger settings ====
840
841 Poll trigger settings,
842
843 * AT Command:
844
845 There is no AT Command for this feature.
846
847 * Downlink Payload (prefix 0x AB 06):
848
849 (% class="box infomessage" %)
850 (((
851 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
852 )))
853
854
855 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
856
857 Enable Disable DI1/DI2/DI2 as trigger,
858
859 * AT Command:
860
861 (% class="box infomessage" %)
862 (((
863 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
864 )))
865
866 **Example:**
867
868 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
869
870 * Downlink Payload (prefix 0xAA 02):
871
872 (% class="box infomessage" %)
873 (((
874 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
875 )))
876
877
878 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
879
880 Set DI1 or DI3(for LT-33222-L) trigger.
881
882 * AT Command:
883
884 (% class="box infomessage" %)
885 (((
886 **AT+TRIG1=a,b**
887 )))
888
889 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
890
891 b : delay timing.
892
893 **Example:**
894
895 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
896
897 * Downlink Payload (prefix 0x09 01 ):
898
899 (% class="box infomessage" %)
900 (((
901 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
902 )))
903
904
905 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
906
907 Set DI2 trigger.
908
909 * AT Command:
910
911 (% class="box infomessage" %)
912 (((
913 **AT+TRIG2=a,b**
914 )))
915
916 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
917
918 b : delay timing.
919
920 **Example:**
921
922 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
923
924 * Downlink Payload (prefix 0x09 02 ):
925
926 (% class="box infomessage" %)
927 (((
928 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
929 )))
930
931
932 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
933
934 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
935
936 * AT Command:
937
938 (% class="box infomessage" %)
939 (((
940 **AT+ACLIM. **
941 )))
942
943 * Downlink Payload (prefix 0xAA 01 ):
944
945 (% class="box infomessage" %)
946 (((
947 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
948 )))
949
950
951 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
952
953 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
954
955 * AT Command:
956
957 (% class="box infomessage" %)
958 (((
959 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
960 )))
961
962 * Downlink Payload (prefix 0xAA 00 ):
963
964 (% class="box infomessage" %)
965 (((
966 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
967 )))
968
969
970 ==== 3.4.2.11 Trigger – Set minimum interval ====
971
972 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
973
974 * AT Command:
975
976 (% class="box infomessage" %)
977 (((
978 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
979 )))
980
981 * Downlink Payload (prefix 0xAC ):
982
983 (% class="box infomessage" %)
984 (((
985 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
986 )))
987
988
989 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
990
991 * AT Command:
992
993 There is no AT Command to control Digital Output
994
995 * Downlink Payload (prefix 0x02):
996
997 (% class="box infomessage" %)
998 (((
999 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1000 )))
1001
1002 (((
1003 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1004 )))
1005
1006 (((
1007 01: Low,  00: High ,  11: No action
1008 )))
1009
1010 [[image:image-20220524092754-5.png]]
1011
1012 (((
1013 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1014 )))
1015
1016 (((
1017 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1018 )))
1019
1020
1021 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1022
1023 * AT Command:
1024
1025 There is no AT Command to control Digital Output
1026
1027 * Downlink Payload (prefix 0xA9):
1028
1029 (% class="box infomessage" %)
1030 (((
1031 (((
1032 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1033 )))
1034 )))
1035
1036 This is to control the digital output time of DO pin. Include four bytes:
1037
1038 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1039
1040 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1041
1042 01: DO pins will change back to original state after timeout.
1043
1044 00: DO pins will change to an inverter state after timeout 
1045
1046 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1047
1048 [[image:image-20220524093238-6.png]]
1049
1050 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1051
1052 [[image:image-20220524093328-7.png]]
1053
1054 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1055
1056 [[image:image-20220524093351-8.png]]
1057
1058 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1059
1060 Latching time. Unit: ms
1061
1062 Device will upload a packet if downlink code executes successfully.
1063
1064 **Example payload:**
1065
1066 **~1. A9 01 01 01 01 07 D0**
1067
1068 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1069
1070 **2. A9 01 00 01 11 07 D0**
1071
1072 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1073
1074 **3. A9 00 00 00 00 07 D0**
1075
1076 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1077
1078 **4. A9 00 11 01 00 07 D0**
1079
1080 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
1081
1082
1083 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1084
1085 * AT Command:
1086
1087 There is no AT Command to control Relay Output
1088
1089 * Downlink Payload (prefix 0x03):
1090
1091 (% class="box infomessage" %)
1092 (((
1093 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1094 )))
1095
1096 (((
1097 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1098 )))
1099
1100 (((
1101 01: Close ,  00: Open , 11: No action
1102 )))
1103
1104 (((
1105 [[image:image-20220524093724-9.png]]
1106 )))
1107
1108 Device will upload a packet if downlink code executes successfully.
1109
1110
1111 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1112
1113 * AT Command:
1114
1115 There is no AT Command to control Relay Output
1116
1117 * Downlink Payload (prefix 0x05):
1118
1119 (% class="box infomessage" %)
1120 (((
1121 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1122 )))
1123
1124 This is to control the relay output time of relay. Include four bytes:
1125
1126 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1127
1128 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1129
1130 01: Relays will change back to original state after timeout.
1131
1132 00: Relays will change to an inverter state after timeout
1133
1134 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1135
1136 [[image:image-20220524093831-10.png]]
1137
1138 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1139
1140 Device will upload a packet if downlink code executes successfully.
1141
1142 **Example payload:**
1143
1144 **~1. 05 01 11 07 D0**
1145
1146 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1147
1148 **2. 05 01 10 07 D0**
1149
1150 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1151
1152 **3. 05 00 01 07 D0**
1153
1154 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1155
1156 **4. 05 00 00 07 D0**
1157
1158 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1159
1160
1161 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1162
1163 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1164
1165 * AT Command:
1166
1167 (% class="box infomessage" %)
1168 (((
1169 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1170 )))
1171
1172 * Downlink Payload (prefix 0xA5):
1173
1174 (% class="box infomessage" %)
1175 (((
1176 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1177 )))
1178
1179
1180 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1181
1182 * AT Command:
1183
1184 (% class="box infomessage" %)
1185 (((
1186 **AT+SETCNT=aa,(bb cc dd ee) **
1187 )))
1188
1189 aa: 1: Set count1,
1190
1191 2: Set count2,
1192
1193 3: Set AV1 count
1194
1195 Bb cc dd ee: number to be set
1196
1197 * Downlink Payload (prefix 0xA8):
1198
1199 (% class="box infomessage" %)
1200 (((
1201 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1202 )))
1203
1204
1205 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1206
1207 Clear counting for counting mode
1208
1209 * AT Command:
1210
1211 (% class="box infomessage" %)
1212 (((
1213 **AT+CLRCOUNT ~/~/ clear all counting**
1214 )))
1215
1216 * Downlink Payload (prefix 0xA6):
1217
1218 (% class="box infomessage" %)
1219 (((
1220 **0x A6 01     ~/~/ clear all counting,**
1221 )))
1222
1223
1224 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1225
1226 * AT Command:
1227
1228 (% class="box infomessage" %)
1229 (((
1230 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1231 )))
1232
1233 * Downlink Payload (prefix 0xA7):
1234
1235 (% class="box infomessage" %)
1236 (((
1237 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1238 )))
1239
1240 (((
1241 range: aa bb cc:0 to 16777215,  (unit:second)
1242
1243
1244 )))
1245
1246 == 3.5 Integrate with Mydevice ==
1247
1248 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:
1249
1250 (((
1251 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1252 )))
1253
1254 (((
1255 **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:
1256 )))
1257
1258 [[image:1653356737703-362.png||height="232" width="732"]]
1259
1260 [[image:image-20220524094641-11.png||height="390" width="723"]]
1261
1262 [[image:image-20220524094641-12.png||height="402" width="718"]]
1263
1264
1265 **Step 3**: Create an account or log in Mydevices.
1266
1267 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1268
1269 Search under The things network
1270
1271 [[image:1653356838789-523.png||height="337" width="740"]]
1272
1273
1274 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1275
1276 [[image:image-20220524094909-1.png||height="335" width="729"]]
1277
1278 [[image:image-20220524094909-2.png||height="337" width="729"]]
1279
1280 [[image:image-20220524094909-3.png||height="338" width="727"]]
1281
1282 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1283
1284 [[image:image-20220524094909-5.png||height="341" width="734"]]
1285
1286
1287 == 3.6 Interface Detail ==
1288
1289 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1290
1291 Support NPN Type sensor
1292
1293 [[image:1653356991268-289.png]]
1294
1295
1296 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1297
1298 (((
1299 The DI port of LT-22222-L can support NPN or PNP output sensor.
1300 )))
1301
1302 (((
1303 (((
1304 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
1305 )))
1306 )))
1307
1308 [[image:1653357170703-587.png]]
1309
1310 (((
1311 (((
1312 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1313 )))
1314 )))
1315
1316 (((
1317
1318 )))
1319
1320 (((
1321 **Example1**: Connect to a Low active sensor.
1322 )))
1323
1324 (((
1325 This type of sensor will output a low signal GND when active.
1326 )))
1327
1328 * (((
1329 Connect sensor’s output to DI1-
1330 )))
1331 * (((
1332 Connect sensor’s VCC to DI1+.
1333 )))
1334
1335 (((
1336 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1337 )))
1338
1339 (((
1340 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1341 )))
1342
1343 (((
1344 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.
1345 )))
1346
1347 (((
1348
1349 )))
1350
1351 (((
1352 **Example2**: Connect to a High active sensor.
1353 )))
1354
1355 (((
1356 This type of sensor will output a high signal (example 24v) when active.
1357 )))
1358
1359 * (((
1360 Connect sensor’s output to DI1+
1361 )))
1362 * (((
1363 Connect sensor’s GND DI1-.
1364 )))
1365
1366 (((
1367 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1368 )))
1369
1370 (((
1371 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1372 )))
1373
1374 (((
1375 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.
1376 )))
1377
1378 (((
1379
1380 )))
1381
1382 (((
1383 **Example3**: Connect to a 220v high active sensor.
1384 )))
1385
1386 (((
1387 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1388 )))
1389
1390 * (((
1391 Connect sensor’s output to DI1+ with a serial 50K resistor
1392 )))
1393 * (((
1394 Connect sensor’s GND DI1-.
1395 )))
1396
1397 (((
1398 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1399 )))
1400
1401 (((
1402 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1403 )))
1404
1405 (((
1406 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.
1407 )))
1408
1409
1410 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1411
1412 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1413
1414 [[image:1653357531600-905.png]]
1415
1416
1417 === 3.6.4 Analog Input Interface ===
1418
1419 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:
1420
1421 **AC2 = (IN2 voltage )/12**
1422
1423 [[image:1653357592296-182.png]]
1424
1425 Example to connect a 4~~20mA sensor
1426
1427 We take the wind speed sensor as an example for reference only.
1428
1429 Specifications of the wind speed sensor:
1430
1431 Red:12~~24v
1432
1433 Yellow:4~~20mA
1434
1435 Black:GND
1436
1437
1438 Connection diagram:
1439
1440 [[image:1653357640609-758.png]]
1441
1442 [[image:1653357648330-671.png||height="155" width="733"]]
1443
1444
1445 === 3.6.5 Relay Output ===
1446
1447 (((
1448 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:
1449 )))
1450
1451 [[image:image-20220524100215-9.png]]
1452
1453 [[image:image-20220524100215-10.png||height="382" width="723"]]
1454
1455
1456 == 3.7 LEDs Indicators ==
1457
1458 [[image:image-20220524100748-11.png]]
1459
1460
1461 = 4. Use AT Command =
1462
1463 == 4.1 Access AT Command ==
1464
1465 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.
1466
1467 [[image:1653358238933-385.png]]
1468
1469 (((
1470 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:
1471 )))
1472
1473 [[image:1653358355238-883.png]]
1474
1475 (((
1476 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/]]
1477 )))
1478
1479 (((
1480 AT+<CMD>?        : Help on <CMD>
1481 )))
1482
1483 (((
1484 AT+<CMD>         : Run <CMD>
1485 )))
1486
1487 (((
1488 AT+<CMD>=<value> : Set the value
1489 )))
1490
1491 (((
1492 AT+<CMD>=?       : Get the value
1493 )))
1494
1495 (((
1496 ATZ: Trig a reset of the MCU
1497 )))
1498
1499 (((
1500 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1501 )))
1502
1503 (((
1504 AT+DEUI: Get or Set the Device EUI
1505 )))
1506
1507 (((
1508 AT+DADDR: Get or Set the Device Address
1509 )))
1510
1511 (((
1512 AT+APPKEY: Get or Set the Application Key
1513 )))
1514
1515 (((
1516 AT+NWKSKEY: Get or Set the Network Session Key
1517 )))
1518
1519 (((
1520 AT+APPSKEY: Get or Set the Application Session Key
1521 )))
1522
1523 (((
1524 AT+APPEUI: Get or Set the Application EUI
1525 )))
1526
1527 (((
1528 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1529 )))
1530
1531 (((
1532 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1533 )))
1534
1535 (((
1536 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1537 )))
1538
1539 (((
1540 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1541 )))
1542
1543 (((
1544 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1545 )))
1546
1547 (((
1548 AT+RX2FQ: Get or Set the Rx2 window frequency
1549 )))
1550
1551 (((
1552 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1553 )))
1554
1555 (((
1556 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1557 )))
1558
1559 (((
1560 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1561 )))
1562
1563 (((
1564 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1565 )))
1566
1567 (((
1568 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1569 )))
1570
1571 (((
1572 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1573 )))
1574
1575 (((
1576 AT+NWKID: Get or Set the Network ID
1577 )))
1578
1579 (((
1580 AT+FCU: Get or Set the Frame Counter Uplink
1581 )))
1582
1583 (((
1584 AT+FCD: Get or Set the Frame Counter Downlink
1585 )))
1586
1587 (((
1588 AT+CLASS: Get or Set the Device Class
1589 )))
1590
1591 (((
1592 AT+JOIN: Join network
1593 )))
1594
1595 (((
1596 AT+NJS: Get OTAA Join Status
1597 )))
1598
1599 (((
1600 AT+SENDB: Send hexadecimal data along with the application port
1601 )))
1602
1603 (((
1604 AT+SEND: Send text data along with the application port
1605 )))
1606
1607 (((
1608 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1609 )))
1610
1611 (((
1612 AT+RECV: Print last received data in raw format
1613 )))
1614
1615 (((
1616 AT+VER: Get current image version and Frequency Band
1617 )))
1618
1619 (((
1620 AT+CFM: Get or Set the confirmation mode (0-1)
1621 )))
1622
1623 (((
1624 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1625 )))
1626
1627 (((
1628 AT+SNR: Get the SNR of the last received packet
1629 )))
1630
1631 (((
1632 AT+RSSI: Get the RSSI of the last received packet
1633 )))
1634
1635 (((
1636 AT+TDC: Get or set the application data transmission interval in ms
1637 )))
1638
1639 (((
1640 AT+PORT: Get or set the application port
1641 )))
1642
1643 (((
1644 AT+DISAT: Disable AT commands
1645 )))
1646
1647 (((
1648 AT+PWORD: Set password, max 9 digits
1649 )))
1650
1651 (((
1652 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1653 )))
1654
1655 (((
1656 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1657 )))
1658
1659 (((
1660 AT+CFG: Print all settings
1661
1662
1663 )))
1664
1665 == 4.2 Common AT Command Sequence ==
1666
1667 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1668
1669 (((
1670 If device has not joined network yet:
1671 )))
1672
1673 (((
1674 (% style="background-color:#dcdcdc" %)123456
1675 )))
1676
1677 (((
1678 (% style="background-color:#dcdcdc" %)AT+FDR
1679 )))
1680
1681 (((
1682 (% style="background-color:#dcdcdc" %)123456
1683 )))
1684
1685 (((
1686 (% style="background-color:#dcdcdc" %)AT+NJM=0
1687 )))
1688
1689 (((
1690 (% style="background-color:#dcdcdc" %)ATZ
1691 )))
1692
1693
1694 (((
1695 If device already joined network:
1696 )))
1697
1698 (((
1699 (% style="background-color:#dcdcdc" %)AT+NJM=0
1700 )))
1701
1702 (((
1703 (% style="background-color:#dcdcdc" %)ATZ
1704
1705
1706 )))
1707
1708 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1709
1710 (((
1711 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1712 )))
1713
1714 (((
1715 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1716 )))
1717
1718 (((
1719 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1720 )))
1721
1722 (((
1723 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1724 )))
1725
1726 (((
1727 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1728 )))
1729
1730 (((
1731 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1732 )))
1733
1734 (((
1735 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1736 )))
1737
1738 (((
1739 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1740 )))
1741
1742 (((
1743 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1744 )))
1745
1746 (((
1747 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1748 )))
1749
1750 (((
1751 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1752 )))
1753
1754 (((
1755 (% 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.
1756 )))
1757
1758 (((
1759 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1760 )))
1761
1762 (((
1763 (% style="color:red" %)**Note:**
1764 )))
1765
1766 (((
1767 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1768 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1769 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.
1770 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
1771 )))
1772
1773 (((
1774 [[image:1653359097980-169.png||height="188" width="729"]]
1775 )))
1776
1777 (((
1778
1779 )))
1780
1781 === 4.2.3 Change to Class A ===
1782
1783 If sensor JOINED
1784 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1785 ATZ
1786
1787
1788 = 5. FAQ =
1789
1790 == 5.1 How to upgrade the image? ==
1791
1792 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1793
1794 * Support new features
1795 * For bug fix
1796 * Change LoRaWAN bands.
1797 Below shows the hardware connection for how to upload an image to the LT:
1798 * [[image:1653359603330-121.png]]
1799
1800 (((
1801 **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]].
1802 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1803 **Step3: **Open flashloader; choose the correct COM port to update.
1804 **For LT-22222-L**:
1805 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.
1806 )))
1807
1808 [[image:image-20220524103407-12.png]]
1809
1810 [[image:image-20220524103429-13.png]]
1811
1812 [[image:image-20220524104033-15.png]]
1813
1814 (% 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:
1815
1816 [[image:1653360054704-518.png||height="186" width="745"]]
1817
1818
1819 (((
1820 (((
1821 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1822 )))
1823 )))
1824
1825 (((
1826 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1827
1828
1829 )))
1830
1831 (((
1832 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1833 )))
1834
1835 (((
1836 (((
1837 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1838 )))
1839 )))
1840
1841 (((
1842 (((
1843 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1844 )))
1845 )))
1846
1847 (((
1848 (% 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.
1849 )))
1850
1851 (((
1852 [[image:1653360231087-571.png||height="401" width="727"]]
1853 )))
1854
1855 (((
1856 (% 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.
1857 )))
1858
1859 (((
1860 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1861 )))
1862
1863 (((
1864 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1865 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1866 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1867 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1868 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1869 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1870 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1871 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1872 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1873 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1874 )))
1875
1876 (((
1877 As shown in below:
1878 )))
1879
1880 [[image:1653360498588-932.png||height="485" width="726"]]
1881
1882
1883 == 5.4 Can I see counting event in Serial? ==
1884
1885 (((
1886 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.
1887
1888
1889 == 5.5 Can i use point to point communication for LT-22222-L? ==
1890
1891 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1892
1893
1894 )))
1895
1896 (((
1897 = 6. Trouble Shooting =
1898 )))
1899
1900 (((
1901 (((
1902 == 6.1 Downlink doesn’t work, how to solve it? ==
1903 )))
1904 )))
1905
1906 (((
1907 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1908
1909
1910 )))
1911
1912 (((
1913 == 6.2 Have trouble to upload image. ==
1914 )))
1915
1916 (((
1917 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1918 )))
1919
1920 (((
1921
1922 )))
1923
1924 (((
1925 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1926 )))
1927
1928 (((
1929 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1930 )))
1931
1932 (((
1933
1934 )))
1935
1936 (((
1937 = 7. Order Info =
1938 )))
1939
1940 (((
1941 (((
1942 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1943 )))
1944 )))
1945
1946 (((
1947 (((
1948 (% style="color:#4f81bd" %)**XXX:**
1949 )))
1950 )))
1951
1952 (((
1953 * (((
1954 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1955 )))
1956 )))
1957
1958 (((
1959 * (((
1960 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1961 )))
1962 )))
1963
1964 (((
1965 * (((
1966 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1967 )))
1968 )))
1969
1970 (((
1971 * (((
1972 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1973 )))
1974 )))
1975
1976 (((
1977 * (((
1978 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1979 )))
1980 )))
1981
1982 (((
1983 * (((
1984 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1985 )))
1986 )))
1987
1988 (((
1989 * (((
1990 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1991 )))
1992 )))
1993
1994 (((
1995 * (((
1996 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1997 )))
1998 )))
1999
2000 (((
2001 * (((
2002 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2003
2004
2005 )))
2006
2007 = 8. Packing Info =
2008 )))
2009
2010 (((
2011 (((
2012 **Package Includes**:
2013 )))
2014 )))
2015
2016 (((
2017 (((
2018 * LT-22222-L I/O Controller x 1
2019 * Stick Antenna for LoRa RF part x 1
2020 * Bracket for controller x1
2021 * Program cable x 1
2022 )))
2023 )))
2024
2025 (((
2026 (((
2027 **Dimension and weight**:
2028 )))
2029 )))
2030
2031 (((
2032 (((
2033 * Device Size: 13.5 x 7 x 3 cm
2034 * Device Weight: 105g
2035 * Package Size / pcs : 14.5 x 8 x 5 cm
2036 * Weight / pcs : 170g
2037
2038
2039 )))
2040 )))
2041
2042 (((
2043 = 9. Support =
2044 )))
2045
2046 * (((
2047 (((
2048 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.
2049 )))
2050 )))
2051 * (((
2052 (((
2053 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
2054 )))
2055 )))
2056
2057 (((
2058 (((
2059 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2060
2061
2062 )))
2063
2064 (((
2065 = 10. Reference​​​​​ =
2066
2067 * Product Page:
2068
2069 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]]
2070
2071 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2072 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2073 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2074 )))
2075 )))
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