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Version 77.21 by Xiaoling on 2022/06/10 08:40
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1 (% style="text-align:center" %)
2 [[image:image-20220523163353-1.jpeg||height="604" width="500"]]
3
4 **LT-22222-L LoRa IO Controller User Manual **
5
6
7 **Table of Contents:**
8
9 {{toc/}}
10
11
12
13
14
15
16
17 = 1.Introduction =
18
19 == 1.1 What is LT Series I/O Controller ==
20
21 (((
22 The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
23 )))
24
25 (((
26 The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
27 )))
28
29 (((
30 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
31 )))
32
33 (((
34 The use environment includes:
35 )))
36
37 (((
38 1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.
39 )))
40
41 (((
42 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
43 )))
44
45 (((
46 [[image:1653295757274-912.png]]
47
48
49 )))
50
51 == 1.2  Specifications ==
52
53 (((
54
55
56 **Hardware System:**
57 )))
58
59 * (((
60 STM32L072CZT6 MCU
61 )))
62 * (((
63 SX1276/78 Wireless Chip 
64 )))
65 * (((
66 (((
67 Power Consumption:
68 )))
69
70 * (((
71 Idle: 4mA@12v
72 )))
73 * (((
74 20dB Transmit: 34mA@12v
75 )))
76 )))
77
78
79 (((
80 **Interface for Model: LT22222-L:**
81 )))
82
83 * (((
84 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
85 )))
86 * (((
87 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
88 )))
89 * (((
90 2 x Relay Output (5A@250VAC / 30VDC)
91 )))
92 * (((
93 2 x 0~~20mA Analog Input (res:0.01mA)
94 )))
95 * (((
96 2 x 0~~30V Analog Input (res:0.01v)
97 )))
98 * (((
99 Power Input 7~~ 24V DC. 
100 )))
101
102
103 (((
104 **LoRa Spec:**
105 )))
106
107 * (((
108 (((
109 Frequency Range:
110 )))
111
112 * (((
113 Band 1 (HF): 862 ~~ 1020 Mhz
114 )))
115 * (((
116 Band 2 (LF): 410 ~~ 528 Mhz
117 )))
118 )))
119 * (((
120 168 dB maximum link budget.
121 )))
122 * (((
123 +20 dBm - 100 mW constant RF output vs.
124 )))
125 * (((
126 +14 dBm high efficiency PA.
127 )))
128 * (((
129 Programmable bit rate up to 300 kbps.
130 )))
131 * (((
132 High sensitivity: down to -148 dBm.
133 )))
134 * (((
135 Bullet-proof front end: IIP3 = -12.5 dBm.
136 )))
137 * (((
138 Excellent blocking immunity.
139 )))
140 * (((
141 Low RX current of 10.3 mA, 200 nA register retention.
142 )))
143 * (((
144 Fully integrated synthesizer with a resolution of 61 Hz.
145 )))
146 * (((
147 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
148 )))
149 * (((
150 Built-in bit synchronizer for clock recovery.
151 )))
152 * (((
153 Preamble detection.
154 )))
155 * (((
156 127 dB Dynamic Range RSSI.
157 )))
158 * (((
159 Automatic RF Sense and CAD with ultra-fast AFC.
160 )))
161 * (((
162 Packet engine up to 256 bytes with CRC.
163
164
165 )))
166
167
168
169 == 1.3 Features ==
170
171 * LoRaWAN Class A & Class C protocol
172 * Optional Customized LoRa Protocol
173 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
174 * AT Commands to change parameters
175 * Remote configure parameters via LoRa Downlink
176 * Firmware upgradable via program port
177 * Counting
178
179
180
181 == 1.4  Applications ==
182
183 * Smart Buildings & Home Automation
184 * Logistics and Supply Chain Management
185 * Smart Metering
186 * Smart Agriculture
187 * Smart Cities
188 * Smart Factory
189
190
191
192 == 1.5 Hardware Variants ==
193
194 (% border="1" style="background-color:#f7faff; width:500px" %)
195 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
196 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
197 * 2 x Digital Input (Bi-direction)
198 * 2 x Digital Output
199 * 2 x Relay Output (5A@250VAC / 30VDC)
200 * 2 x 0~~20mA Analog Input (res:0.01mA)
201 * 2 x 0~~30V Analog Input (res:0.01v)
202 * 1 x Counting Port
203 )))
204
205
206
207 = 2. Power ON Device =
208
209 The LT controller can be powered by 7 ~~ 24V DC power source. Connect VIN to Power Input V+ and GND to power input V- to power the LT controller.
210
211 (((
212 PWR will on when device is properly powered.
213 )))
214
215 [[image:1653297104069-180.png]]
216
217
218
219 = 3. Operation Mode =
220
221 == 3.1 How it works? ==
222
223 (((
224 The LT is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the LT. It will auto join the network via OTAA. For LT-22222-L, the LED will show the Join status: After power on **TX LED** will fast blink 5 times, LT-22222-L will enter working mode and start to JOIN LoRaWAN network. **TX LED** will be on for 5 seconds after joined in network. When there is message from server, the **RX LED** will be on for 1 second. 
225 )))
226
227 (((
228 In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>||anchor="H4.UseATCommand"]] to set the keys in the devices.
229
230
231 )))
232
233
234
235 == 3.2 Example to join LoRaWAN network ==
236
237 (((
238 This chapter shows an example for how to join the TTN LoRaWAN Network. Below is the network structure, we use our LG308 as LoRaWAN gateway here. 
239 )))
240
241 [[image:image-20220523172350-1.png||height="266" width="864"]]
242
243 (((
244 The LG308 is already set to connect to [[TTN network >>url:https://www.thethingsnetwork.org/]]. So what we need to do now is only configure register this device to TTN:
245 )))
246
247 (((
248 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
249 )))
250
251 (((
252 Each LT is shipped with a sticker with the default device EUI as below:
253 )))
254
255 [[image:1653297924498-393.png]]
256
257 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
258
259 Add APP EUI in the application.
260
261 [[image:1653297955910-247.png||height="321" width="716"]]
262
263
264 Add APP KEY and DEV EUI
265
266 [[image:1653298023685-319.png]]
267
268
269 (((
270 **Step 2**: Power on LT and it will auto join to the TTN network. After join success, it will start to upload message to TTN and user can see in the panel.
271 )))
272
273 [[image:1653298044601-602.png||height="405" width="709"]]
274
275
276
277 == 3.3 Uplink Payload ==
278
279 There are five working modes + one interrupt mode on LT for different type application:
280
281 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
282 * **MOD2**: Double DI Counting + DO + RO
283 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
284 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
285 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
286 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
287
288
289
290 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
291
292 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
293
294 [[image:image-20220523174024-3.png]]
295
296 (((
297 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
298 )))
299
300 [[image:image-20220523174254-4.png]]
301
302 * RO is for relay. ROx=1 : close，ROx=0 always open.
303 * DI is for digital input. DIx=1: high or float, DIx=0: low.
304 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
305
306 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
307
308 For example if payload is: [[image:image-20220523175847-2.png]]
309
310 **The value for the interface is:  **
311
312 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
313
314 AVI2 channel voltage is 0x04AC/1000=1.196V
315
316 ACI1 channel current is 0x1310/1000=4.880mA
317
318 ACI2 channel current is 0x1300/1000=4.864mA
319
320 The last byte 0xAA= 10101010(B) means
321
322 * [1] RO1 relay channel is close and the RO1 LED is ON.
323 * [0] RO2 relay channel is open and RO2 LED is OFF;
324
325
326 **LT22222-L:**
327
328 * [1] DI2 channel is high input and DI2 LED is ON;
329 * [0] DI1 channel is low input;
330
331 * [0] DO3 channel output state
332 ** DO3 is float in case no load between DO3 and V+.;
333 ** DO3 is high in case there is load between DO3 and V+.
334 ** DO3 LED is off in both case
335 * [1] DO2 channel output is low and DO2 LED is ON.
336 * [0] DO1 channel output state
337 ** DO1 is float in case no load between DO1 and V+.;
338 ** DO1 is high in case there is load between DO1 and V+.
339 ** DO1 LED is off in both case
340
341
342
343 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
344
345 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
346
347 (((
348 Total : 11 bytes payload
349 )))
350
351 [[image:image-20220523180452-3.png]]
352
353 (((
354 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
355 )))
356
357 [[image:image-20220523180506-4.png]]
358
359 * RO is for relay. ROx=1 : close，ROx=0 always open.
360 * FIRST: Indicate this is the first packet after join network.
361 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
362
363 (((
364 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
365 )))
366
367 (((
368 **To use counting mode, please run:**
369 )))
370
371 (% class="box infomessage" %)
372 (((
373 (((
374 **AT+MOD=2**
375 )))
376 )))
377
378 (% class="box infomessage" %)
379 (((
380 (((
381 **ATZ**
382 )))
383 )))
384
385 (((
386 (% style="color:#4f81bd" %)**AT Commands for counting:**
387 )))
388
389 (((
390 **For LT22222-L:**
391 )))
392
393 (% class="box infomessage" %)
394 (((
395 (((
396 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
397 )))
398 )))
399
400 (% class="box infomessage" %)
401 (((
402 (((
403 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
404 )))
405 )))
406
407 (% class="box infomessage" %)
408 (((
409 (((
410 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
411 )))
412 )))
413
414 (% class="box infomessage" %)
415 (((
416 (((
417 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
418 )))
419 )))
420
421 (% class="box infomessage" %)
422 (((
423 (((
424 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
425 )))
426 )))
427
428 (% class="box infomessage" %)
429 (((
430 (((
431 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
432 )))
433 )))
434
435
436
437 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
438
439 **LT22222-L**: This mode the DI1 is used as a counting pin.
440
441 [[image:image-20220523181246-5.png]]
442
443 (((
444 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
445 )))
446
447 [[image:image-20220523181301-6.png]]
448
449 * RO is for relay. ROx=1 : close，ROx=0 always open.
450 * FIRST: Indicate this is the first packet after join network.
451 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
452
453 (((
454 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
455 )))
456
457 (((
458 **To use counting mode, please run:**
459 )))
460
461 (% class="box infomessage" %)
462 (((
463 (((
464 **AT+MOD=3**
465 )))
466 )))
467
468 (% class="box infomessage" %)
469 (((
470 (((
471 **ATZ**
472 )))
473 )))
474
475 (((
476 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
477
478
479 )))
480
481
482
483 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
484
485 **LT22222-L**: This mode the DI1 is used as a counting pin.
486
487 The AVI1 is also used for counting. AVI1 is used to monitor the voltage. It will check the voltage **every 60s**, if voltage is higher or lower than VOLMAX mV, the AVI1 Counting increase 1, so AVI1 counting can be used to measure a machine working hour.
488
489 [[image:image-20220523181903-8.png]]
490
491 (((
492 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
493 )))
494
495 [[image:image-20220523181727-7.png]]
496
497 * RO is for relay. ROx=1 : close，ROx=0 always open.
498 * FIRST: Indicate this is the first packet after join network.
499 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
500
501 (((
502 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
503 )))
504
505 (((
506 **To use this mode, please run:**
507 )))
508
509 (% class="box infomessage" %)
510 (((
511 (((
512 **AT+MOD=4**
513 )))
514 )))
515
516 (% class="box infomessage" %)
517 (((
518 (((
519 **ATZ**
520 )))
521 )))
522
523 (((
524
525 )))
526
527 (((
528 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
529 )))
530
531 (((
532 **Plus below command for AVI1 Counting:**
533 )))
534
535 (% class="box infomessage" %)
536 (((
537 (((
538 **AT+SETCNT=3,60   (set AVI Count to 60)**
539 )))
540 )))
541
542 (% class="box infomessage" %)
543 (((
544 (((
545 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
546 )))
547 )))
548
549 (% class="box infomessage" %)
550 (((
551 (((
552 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
553 )))
554 )))
555
556 (% class="box infomessage" %)
557 (((
558 (((
559 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
560 )))
561 )))
562
563
564
565 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
566
567 **LT22222-L**: This mode the DI1 is used as a counting pin.
568
569 [[image:image-20220523182334-9.png]]
570
571 (((
572 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
573 )))
574
575 * RO is for relay. ROx=1 : close，ROx=0 always open.
576 * FIRST: Indicate this is the first packet after join network.
577 * (((
578 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
579 )))
580
581 (((
582 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
583 )))
584
585 (((
586 **To use this mode, please run:**
587 )))
588
589 (% class="box infomessage" %)
590 (((
591 (((
592 **AT+MOD=5**
593 )))
594 )))
595
596 (% class="box infomessage" %)
597 (((
598 (((
599 **ATZ**
600 )))
601 )))
602
603 (((
604 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
605
606
607 )))
608
609
610
611 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
612
613 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
614
615 For example, if user has configured below commands:
616
617 * **AT+MOD=1 ** **~-~->** The normal working mode
618 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
619
620 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
621
622 1. Periodically uplink (Base on TDC time). Payload is same as the normal MOD (MOD 1 for above command). This uplink uses LoRaWAN (% style="color:#4f81bd" %)**unconfirmed**(%%) data type
623 1. Trigger uplink when meet the trigger condition. LT will sent two packets in this case, the first uplink use payload specify in this mod (mod=6), the second packets use the normal mod payload(MOD=1 for above settings). Both Uplinks use LoRaWAN (% style="color:#4f81bd" %)**CONFIRMED data type.**
624
625 **AT Command to set Trigger Condition**:
626
627 (% style="color:#4f81bd" %)**Trigger base on voltage**:
628
629 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
630
631 **Example:**
632
633 AT+AVLIM=3000,6000,0,2000   (If AVI1 voltage lower than 3v or higher than 6v. or AV2 voltage is higher than 2v, LT will trigger Uplink)
634
635 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
636
637
638 (% style="color:#4f81bd" %)**Trigger base on current**:
639
640 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
641
642 **Example:**
643
644 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
645
646
647 (% style="color:#4f81bd" %)**Trigger base on DI status**:
648
649 DI status trigger Flag.
650
651 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
652
653 **Example:**
654
655 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
656
657
658 **Downlink Command to set Trigger Condition**
659
660 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
661
662 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
663
664 AA: Code for this downlink Command:
665
666 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
667
668 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
669
670 yy2 yy2: AC1 or AV1 high limit.
671
672 yy3 yy3: AC2 or AV2 low limit.
673
674 Yy4 yy4: AC2 or AV2 high limit.
675
676 **Example1**: AA 00 13 88 00 00 00 00 00 00
677
678 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
679
680 **Example2**: AA 02 01 00
681
682 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
683
684 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
685
686 MOD6 Payload : total 11 bytes payload
687
688 [[image:image-20220524085923-1.png]]
689
690 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
691
692 [[image:image-20220524090106-2.png]]
693
694 * Each bits shows if the corresponding trigger has been configured.
695
696 **Example:**
697
698 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
699
700
701 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
702
703 [[image:image-20220524090249-3.png]]
704
705 * Each bits shows which status has been trigger on this uplink.
706
707 **Example:**
708
709 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
710
711
712 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
713
714 [[image:image-20220524090456-4.png]]
715
716 * Each bits shows which status has been trigger on this uplink.
717
718 **Example:**
719
720 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
721
722 00000101: Means both DI1 and DI2 trigger are enabled.
723
724
725 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
726
727 Downlink command to poll MOD6 status:
728
729 **AB 06**
730
731 When device got this command, it will send the MOD6 payload.
732
733
734
735 === 3.3.7 Payload Decoder ===
736
737 (((
738 **Decoder for TTN/loraserver/ChirpStack**: [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/Payload_decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/Payload_decoder/]]
739
740
741 )))
742
743
744
745 == 3.4 ​Configure LT via AT or Downlink ==
746
747 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
748
749 (((
750 There are two kinds of Commands:
751 )))
752
753 * (% style="color:#4f81bd" %)**Common Commands**(%%): They should be available for each sensor, such as: change uplink interval, reset device. For firmware v1.5.4, user can find what common commands it supports: [[End Device AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
754
755 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
756
757
758
759 === 3.4.1 Common Commands ===
760
761 They should be available for each of Dragino Sensors, such as: change uplink interval, reset device. For firmware v1.5.4, user can find what common commands it supports: [[End Device AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
762
763
764
765 === 3.4.2 Sensor related commands ===
766
767 ==== 3.4.2.1 Set Transmit Interval ====
768
769 Set device uplink interval.
770
771 * AT Command:
772
773 (% class="box infomessage" %)
774 (((
775 **AT+TDC=N **
776 )))
777
778 **Example: **AT+TDC=30000. Means set interval to 30 seconds
779
780 * Downlink Payload (prefix 0x01):
781
782 (% class="box infomessage" %)
783 (((
784 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
785 )))
786
787
788
789 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
790
791 Set work mode.
792
793 * AT Command:
794
795 (% class="box infomessage" %)
796 (((
797 **AT+MOD=N  **
798 )))
799
800 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
801
802 * Downlink Payload (prefix 0x0A):
803
804 (% class="box infomessage" %)
805 (((
806 **0x0A aa     ~/~/ Same as AT+MOD=aa**
807 )))
808
809
810
811 ==== 3.4.2.3 Poll an uplink ====
812
813 * AT Command:
814
815 There is no AT Command to poll uplink
816
817 * Downlink Payload (prefix 0x08):
818
819 (% class="box infomessage" %)
820 (((
821 **0x08 FF     ~/~/ Poll an uplink,**
822 )))
823
824 **Example**: 0x08FF, ask device to send an Uplink
825
826
827
828 ==== 3.4.2.4 Enable Trigger Mode ====
829
830 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
831
832 * AT Command:
833
834 (% class="box infomessage" %)
835 (((
836 **AT+ADDMOD6=1 or 0**
837 )))
838
839 1: Enable Trigger Mode
840
841 0: Disable Trigger Mode
842
843 * Downlink Payload (prefix 0x0A 06):
844
845 (% class="box infomessage" %)
846 (((
847 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
848 )))
849
850
851 ==== 3.4.2.5 Poll trigger settings ====
852
853 Poll trigger settings,
854
855 * AT Command:
856
857 There is no AT Command for this feature.
858
859 * Downlink Payload (prefix 0x AB 06):
860
861 (% class="box infomessage" %)
862 (((
863 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
864 )))
865
866
867 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
868
869 Enable Disable DI1/DI2/DI2 as trigger,
870
871 * AT Command:
872
873 (% class="box infomessage" %)
874 (((
875 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
876 )))
877
878 **Example:**
879
880 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
881
882 * Downlink Payload (prefix 0xAA 02):
883
884 (% class="box infomessage" %)
885 (((
886 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
887 )))
888
889
890 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
891
892 Set DI1 or DI3(for LT-33222-L) trigger.
893
894 * AT Command:
895
896 (% class="box infomessage" %)
897 (((
898 **AT+TRIG1=a,b**
899 )))
900
901 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
902
903 b : delay timing.
904
905 **Example:**
906
907 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
908
909 * Downlink Payload (prefix 0x09 01 ):
910
911 (% class="box infomessage" %)
912 (((
913 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
914 )))
915
916
917 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
918
919 Set DI2 trigger.
920
921 * AT Command:
922
923 (% class="box infomessage" %)
924 (((
925 **AT+TRIG2=a,b**
926 )))
927
928 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
929
930 b : delay timing.
931
932 **Example:**
933
934 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
935
936 * Downlink Payload (prefix 0x09 02 ):
937
938 (% class="box infomessage" %)
939 (((
940 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
941 )))
942
943
944 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
945
946 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
947
948 * AT Command:
949
950 (% class="box infomessage" %)
951 (((
952 **AT+ACLIM. **
953 )))
954
955 * Downlink Payload (prefix 0xAA 01 ):
956
957 (% class="box infomessage" %)
958 (((
959 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
960 )))
961
962
963 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
964
965 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
966
967 * AT Command:
968
969 (% class="box infomessage" %)
970 (((
971 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
972 )))
973
974 * Downlink Payload (prefix 0xAA 00 ):
975
976 (% class="box infomessage" %)
977 (((
978 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
979 )))
980
981
982 ==== 3.4.2.11 Trigger – Set minimum interval ====
983
984 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
985
986 * AT Command:
987
988 (% class="box infomessage" %)
989 (((
990 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
991 )))
992
993 * Downlink Payload (prefix 0xAC ):
994
995 (% class="box infomessage" %)
996 (((
997 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
998 )))
999
1000
1001 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1002
1003 * AT Command:
1004
1005 There is no AT Command to control Digital Output
1006
1007 * Downlink Payload (prefix 0x02):
1008
1009 (% class="box infomessage" %)
1010 (((
1011 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1012 )))
1013
1014 (((
1015 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1016 )))
1017
1018 (((
1019 01: Low,  00: High ,  11: No action
1020 )))
1021
1022 [[image:image-20220524092754-5.png]]
1023
1024 (((
1025 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1026 )))
1027
1028 (((
1029 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1030 )))
1031
1032
1033 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1034
1035 * AT Command:
1036
1037 There is no AT Command to control Digital Output
1038
1039 * Downlink Payload (prefix 0xA9):
1040
1041 (% class="box infomessage" %)
1042 (((
1043 (((
1044 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1045 )))
1046 )))
1047
1048 This is to control the digital output time of DO pin. Include four bytes:
1049
1050 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1051
1052 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1053
1054 01: DO pins will change back to original state after timeout.
1055
1056 00: DO pins will change to an inverter state after timeout 
1057
1058 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1059
1060 [[image:image-20220524093238-6.png]]
1061
1062 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1063
1064 [[image:image-20220524093328-7.png]]
1065
1066 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1067
1068 [[image:image-20220524093351-8.png]]
1069
1070 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1071
1072 Latching time. Unit: ms
1073
1074 Device will upload a packet if downlink code executes successfully.
1075
1076 **Example payload:**
1077
1078 **~1. A9 01 01 01 01 07 D0**
1079
1080 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1081
1082 **2. A9 01 00 01 11 07 D0**
1083
1084 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1085
1086 **3. A9 00 00 00 00 07 D0**
1087
1088 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1089
1090 **4. A9 00 11 01 00 07 D0**
1091
1092 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
1093
1094
1095 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1096
1097 * AT Command:
1098
1099 There is no AT Command to control Relay Output
1100
1101 * Downlink Payload (prefix 0x03):
1102
1103 (% class="box infomessage" %)
1104 (((
1105 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1106 )))
1107
1108 (((
1109 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1110 )))
1111
1112 (((
1113 01: Close ,  00: Open , 11: No action
1114 )))
1115
1116 (((
1117 [[image:image-20220524093724-9.png]]
1118 )))
1119
1120 Device will upload a packet if downlink code executes successfully.
1121
1122
1123 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1124
1125 * AT Command:
1126
1127 There is no AT Command to control Relay Output
1128
1129 * Downlink Payload (prefix 0x05):
1130
1131 (% class="box infomessage" %)
1132 (((
1133 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1134 )))
1135
1136 This is to control the relay output time of relay. Include four bytes:
1137
1138 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1139
1140 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1141
1142 01: Relays will change back to original state after timeout.
1143
1144 00: Relays will change to an inverter state after timeout
1145
1146 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1147
1148 [[image:image-20220524093831-10.png]]
1149
1150 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1151
1152 Device will upload a packet if downlink code executes successfully.
1153
1154 **Example payload:**
1155
1156 **~1. 05 01 11 07 D0**
1157
1158 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1159
1160 **2. 05 01 10 07 D0**
1161
1162 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1163
1164 **3. 05 00 01 07 D0**
1165
1166 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1167
1168 **4. 05 00 00 07 D0**
1169
1170 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1171
1172
1173 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1174
1175 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1176
1177 * AT Command:
1178
1179 (% class="box infomessage" %)
1180 (((
1181 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1182 )))
1183
1184 * Downlink Payload (prefix 0xA5):
1185
1186 (% class="box infomessage" %)
1187 (((
1188 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1189 )))
1190
1191
1192 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1193
1194 * AT Command:
1195
1196 (% class="box infomessage" %)
1197 (((
1198 **AT+SETCNT=aa,(bb cc dd ee) **
1199 )))
1200
1201 aa: 1: Set count1,
1202
1203 2: Set count2,
1204
1205 3: Set AV1 count
1206
1207 Bb cc dd ee: number to be set
1208
1209 * Downlink Payload (prefix 0xA8):
1210
1211 (% class="box infomessage" %)
1212 (((
1213 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1214 )))
1215
1216
1217 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1218
1219 Clear counting for counting mode
1220
1221 * AT Command:
1222
1223 (% class="box infomessage" %)
1224 (((
1225 **AT+CLRCOUNT ~/~/ clear all counting**
1226 )))
1227
1228 * Downlink Payload (prefix 0xA6):
1229
1230 (% class="box infomessage" %)
1231 (((
1232 **0x A6 01     ~/~/ clear all counting,**
1233 )))
1234
1235
1236 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1237
1238 * AT Command:
1239
1240 (% class="box infomessage" %)
1241 (((
1242 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1243 )))
1244
1245 * Downlink Payload (prefix 0xA7):
1246
1247 (% class="box infomessage" %)
1248 (((
1249 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1250 )))
1251
1252 (((
1253 range: aa bb cc:0 to 16777215,  (unit:second)
1254
1255
1256 )))
1257
1258 == 3.5 Integrate with Mydevice ==
1259
1260 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:
1261
1262 (((
1263 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1264 )))
1265
1266 (((
1267 **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:
1268 )))
1269
1270 [[image:1653356737703-362.png||height="232" width="732"]]
1271
1272 [[image:image-20220524094641-11.png||height="390" width="723"]]
1273
1274 [[image:image-20220524094641-12.png||height="402" width="718"]]
1275
1276
1277 **Step 3**: Create an account or log in Mydevices.
1278
1279 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1280
1281 Search under The things network
1282
1283 [[image:1653356838789-523.png||height="337" width="740"]]
1284
1285
1286 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1287
1288 [[image:image-20220524094909-1.png||height="335" width="729"]]
1289
1290 [[image:image-20220524094909-2.png||height="337" width="729"]]
1291
1292 [[image:image-20220524094909-3.png||height="338" width="727"]]
1293
1294 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1295
1296 [[image:image-20220524094909-5.png||height="341" width="734"]]
1297
1298
1299 == 3.6 Interface Detail ==
1300
1301 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1302
1303 Support NPN Type sensor
1304
1305 [[image:1653356991268-289.png]]
1306
1307
1308 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1309
1310 (((
1311 The DI port of LT-22222-L can support NPN or PNP output sensor.
1312 )))
1313
1314 (((
1315 (((
1316 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
1317 )))
1318 )))
1319
1320 [[image:1653357170703-587.png]]
1321
1322 (((
1323 (((
1324 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1325 )))
1326 )))
1327
1328 (((
1329
1330 )))
1331
1332 (((
1333 **Example1**: Connect to a Low active sensor.
1334 )))
1335
1336 (((
1337 This type of sensor will output a low signal GND when active.
1338 )))
1339
1340 * (((
1341 Connect sensor’s output to DI1-
1342 )))
1343 * (((
1344 Connect sensor’s VCC to DI1+.
1345 )))
1346
1347 (((
1348 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1349 )))
1350
1351 (((
1352 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1353 )))
1354
1355 (((
1356 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.
1357 )))
1358
1359 (((
1360
1361 )))
1362
1363 (((
1364 **Example2**: Connect to a High active sensor.
1365 )))
1366
1367 (((
1368 This type of sensor will output a high signal (example 24v) when active.
1369 )))
1370
1371 * (((
1372 Connect sensor’s output to DI1+
1373 )))
1374 * (((
1375 Connect sensor’s GND DI1-.
1376 )))
1377
1378 (((
1379 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1380 )))
1381
1382 (((
1383 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1384 )))
1385
1386 (((
1387 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.
1388 )))
1389
1390 (((
1391
1392 )))
1393
1394 (((
1395 **Example3**: Connect to a 220v high active sensor.
1396 )))
1397
1398 (((
1399 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1400 )))
1401
1402 * (((
1403 Connect sensor’s output to DI1+ with a serial 50K resistor
1404 )))
1405 * (((
1406 Connect sensor’s GND DI1-.
1407 )))
1408
1409 (((
1410 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1411 )))
1412
1413 (((
1414 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1415 )))
1416
1417 (((
1418 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.
1419 )))
1420
1421
1422 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1423
1424 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1425
1426 [[image:1653357531600-905.png]]
1427
1428
1429 === 3.6.4 Analog Input Interface ===
1430
1431 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:
1432
1433 **AC2 = (IN2 voltage )/12**
1434
1435 [[image:1653357592296-182.png]]
1436
1437 Example to connect a 4~~20mA sensor
1438
1439 We take the wind speed sensor as an example for reference only.
1440
1441 Specifications of the wind speed sensor:
1442
1443 Red:12~~24v
1444
1445 Yellow:4~~20mA
1446
1447 Black:GND
1448
1449
1450 Connection diagram:
1451
1452 [[image:1653357640609-758.png]]
1453
1454 [[image:1653357648330-671.png||height="155" width="733"]]
1455
1456
1457 === 3.6.5 Relay Output ===
1458
1459 (((
1460 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:
1461 )))
1462
1463 [[image:image-20220524100215-9.png]]
1464
1465 [[image:image-20220524100215-10.png||height="382" width="723"]]
1466
1467
1468 == 3.7 LEDs Indicators ==
1469
1470 [[image:image-20220524100748-11.png]]
1471
1472
1473 = 4. Use AT Command =
1474
1475 == 4.1 Access AT Command ==
1476
1477 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.
1478
1479 [[image:1653358238933-385.png]]
1480
1481 (((
1482 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:
1483 )))
1484
1485 [[image:1653358355238-883.png]]
1486
1487 (((
1488 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/]]
1489 )))
1490
1491 (((
1492 AT+<CMD>?        : Help on <CMD>
1493 )))
1494
1495 (((
1496 AT+<CMD>         : Run <CMD>
1497 )))
1498
1499 (((
1500 AT+<CMD>=<value> : Set the value
1501 )))
1502
1503 (((
1504 AT+<CMD>=?       : Get the value
1505 )))
1506
1507 (((
1508 ATZ: Trig a reset of the MCU
1509 )))
1510
1511 (((
1512 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1513 )))
1514
1515 (((
1516 AT+DEUI: Get or Set the Device EUI
1517 )))
1518
1519 (((
1520 AT+DADDR: Get or Set the Device Address
1521 )))
1522
1523 (((
1524 AT+APPKEY: Get or Set the Application Key
1525 )))
1526
1527 (((
1528 AT+NWKSKEY: Get or Set the Network Session Key
1529 )))
1530
1531 (((
1532 AT+APPSKEY: Get or Set the Application Session Key
1533 )))
1534
1535 (((
1536 AT+APPEUI: Get or Set the Application EUI
1537 )))
1538
1539 (((
1540 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1541 )))
1542
1543 (((
1544 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1545 )))
1546
1547 (((
1548 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1549 )))
1550
1551 (((
1552 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1553 )))
1554
1555 (((
1556 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1557 )))
1558
1559 (((
1560 AT+RX2FQ: Get or Set the Rx2 window frequency
1561 )))
1562
1563 (((
1564 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1565 )))
1566
1567 (((
1568 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1569 )))
1570
1571 (((
1572 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1573 )))
1574
1575 (((
1576 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1577 )))
1578
1579 (((
1580 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1581 )))
1582
1583 (((
1584 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1585 )))
1586
1587 (((
1588 AT+NWKID: Get or Set the Network ID
1589 )))
1590
1591 (((
1592 AT+FCU: Get or Set the Frame Counter Uplink
1593 )))
1594
1595 (((
1596 AT+FCD: Get or Set the Frame Counter Downlink
1597 )))
1598
1599 (((
1600 AT+CLASS: Get or Set the Device Class
1601 )))
1602
1603 (((
1604 AT+JOIN: Join network
1605 )))
1606
1607 (((
1608 AT+NJS: Get OTAA Join Status
1609 )))
1610
1611 (((
1612 AT+SENDB: Send hexadecimal data along with the application port
1613 )))
1614
1615 (((
1616 AT+SEND: Send text data along with the application port
1617 )))
1618
1619 (((
1620 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1621 )))
1622
1623 (((
1624 AT+RECV: Print last received data in raw format
1625 )))
1626
1627 (((
1628 AT+VER: Get current image version and Frequency Band
1629 )))
1630
1631 (((
1632 AT+CFM: Get or Set the confirmation mode (0-1)
1633 )))
1634
1635 (((
1636 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1637 )))
1638
1639 (((
1640 AT+SNR: Get the SNR of the last received packet
1641 )))
1642
1643 (((
1644 AT+RSSI: Get the RSSI of the last received packet
1645 )))
1646
1647 (((
1648 AT+TDC: Get or set the application data transmission interval in ms
1649 )))
1650
1651 (((
1652 AT+PORT: Get or set the application port
1653 )))
1654
1655 (((
1656 AT+DISAT: Disable AT commands
1657 )))
1658
1659 (((
1660 AT+PWORD: Set password, max 9 digits
1661 )))
1662
1663 (((
1664 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1665 )))
1666
1667 (((
1668 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1669 )))
1670
1671 (((
1672 AT+CFG: Print all settings
1673
1674
1675 )))
1676
1677 == 4.2 Common AT Command Sequence ==
1678
1679 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1680
1681 (((
1682 If device has not joined network yet:
1683 )))
1684
1685 (((
1686 (% style="background-color:#dcdcdc" %)123456
1687 )))
1688
1689 (((
1690 (% style="background-color:#dcdcdc" %)AT+FDR
1691 )))
1692
1693 (((
1694 (% style="background-color:#dcdcdc" %)123456
1695 )))
1696
1697 (((
1698 (% style="background-color:#dcdcdc" %)AT+NJM=0
1699 )))
1700
1701 (((
1702 (% style="background-color:#dcdcdc" %)ATZ
1703 )))
1704
1705
1706 (((
1707 If device already joined network:
1708 )))
1709
1710 (((
1711 (% style="background-color:#dcdcdc" %)AT+NJM=0
1712 )))
1713
1714 (((
1715 (% style="background-color:#dcdcdc" %)ATZ
1716
1717
1718 )))
1719
1720 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1721
1722 (((
1723 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1724 )))
1725
1726 (((
1727 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1728 )))
1729
1730 (((
1731 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1732 )))
1733
1734 (((
1735 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1736 )))
1737
1738 (((
1739 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1740 )))
1741
1742 (((
1743 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1744 )))
1745
1746 (((
1747 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1748 )))
1749
1750 (((
1751 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1752 )))
1753
1754 (((
1755 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1756 )))
1757
1758 (((
1759 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1760 )))
1761
1762 (((
1763 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1764 )))
1765
1766 (((
1767 (% 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.
1768 )))
1769
1770 (((
1771 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1772 )))
1773
1774 (((
1775 (% style="color:red" %)**Note:**
1776 )))
1777
1778 (((
1779 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1780 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1781 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.
1782 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
1783 )))
1784
1785 (((
1786 [[image:1653359097980-169.png||height="188" width="729"]]
1787 )))
1788
1789 (((
1790
1791 )))
1792
1793 === 4.2.3 Change to Class A ===
1794
1795 If sensor JOINED
1796 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1797 ATZ
1798
1799
1800 = 5. FAQ =
1801
1802 == 5.1 How to upgrade the image? ==
1803
1804 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1805
1806 * Support new features
1807 * For bug fix
1808 * Change LoRaWAN bands.
1809 Below shows the hardware connection for how to upload an image to the LT:
1810 * [[image:1653359603330-121.png]]
1811
1812 (((
1813 **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]].
1814 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1815 **Step3: **Open flashloader; choose the correct COM port to update.
1816 **For LT-22222-L**:
1817 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.
1818 )))
1819
1820 [[image:image-20220524103407-12.png]]
1821
1822 [[image:image-20220524103429-13.png]]
1823
1824 [[image:image-20220524104033-15.png]]
1825
1826 (% 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:
1827
1828 [[image:1653360054704-518.png||height="186" width="745"]]
1829
1830
1831 (((
1832 (((
1833 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1834 )))
1835 )))
1836
1837 (((
1838 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1839
1840
1841 )))
1842
1843 (((
1844 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1845 )))
1846
1847 (((
1848 (((
1849 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1850 )))
1851 )))
1852
1853 (((
1854 (((
1855 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1856 )))
1857 )))
1858
1859 (((
1860 (% 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.
1861 )))
1862
1863 (((
1864 [[image:1653360231087-571.png||height="401" width="727"]]
1865 )))
1866
1867 (((
1868 (% 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.
1869 )))
1870
1871 (((
1872 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1873 )))
1874
1875 (((
1876 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1877 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1878 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1879 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1880 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1881 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1882 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1883 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1884 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1885 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1886 )))
1887
1888 (((
1889 As shown in below:
1890 )))
1891
1892 [[image:1653360498588-932.png||height="485" width="726"]]
1893
1894
1895 == 5.4 Can I see counting event in Serial? ==
1896
1897 (((
1898 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.
1899
1900
1901 == 5.5 Can i use point to point communication for LT-22222-L? ==
1902
1903 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1904
1905
1906 )))
1907
1908 (((
1909 = 6. Trouble Shooting =
1910 )))
1911
1912 (((
1913 (((
1914 == 6.1 Downlink doesn’t work, how to solve it? ==
1915 )))
1916 )))
1917
1918 (((
1919 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1920
1921
1922 )))
1923
1924 (((
1925 == 6.2 Have trouble to upload image. ==
1926 )))
1927
1928 (((
1929 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1930 )))
1931
1932 (((
1933
1934 )))
1935
1936 (((
1937 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1938 )))
1939
1940 (((
1941 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1942 )))
1943
1944 (((
1945
1946 )))
1947
1948 (((
1949 = 7. Order Info =
1950 )))
1951
1952 (((
1953 (((
1954 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1955 )))
1956 )))
1957
1958 (((
1959 (((
1960 (% style="color:#4f81bd" %)**XXX:**
1961 )))
1962 )))
1963
1964 (((
1965 * (((
1966 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1967 )))
1968 )))
1969
1970 (((
1971 * (((
1972 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1973 )))
1974 )))
1975
1976 (((
1977 * (((
1978 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1979 )))
1980 )))
1981
1982 (((
1983 * (((
1984 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1985 )))
1986 )))
1987
1988 (((
1989 * (((
1990 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1991 )))
1992 )))
1993
1994 (((
1995 * (((
1996 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1997 )))
1998 )))
1999
2000 (((
2001 * (((
2002 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2003 )))
2004 )))
2005
2006 (((
2007 * (((
2008 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2009 )))
2010 )))
2011
2012 (((
2013 * (((
2014 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2015
2016
2017 )))
2018
2019 = 8. Packing Info =
2020 )))
2021
2022 (((
2023 (((
2024 **Package Includes**:
2025 )))
2026 )))
2027
2028 (((
2029 (((
2030 * LT-22222-L I/O Controller x 1
2031 * Stick Antenna for LoRa RF part x 1
2032 * Bracket for controller x1
2033 * Program cable x 1
2034 )))
2035 )))
2036
2037 (((
2038 (((
2039 **Dimension and weight**:
2040 )))
2041 )))
2042
2043 (((
2044 (((
2045 * Device Size: 13.5 x 7 x 3 cm
2046 * Device Weight: 105g
2047 * Package Size / pcs : 14.5 x 8 x 5 cm
2048 * Weight / pcs : 170g
2049
2050
2051 )))
2052 )))
2053
2054 (((
2055 = 9. Support =
2056 )))
2057
2058 * (((
2059 (((
2060 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.
2061 )))
2062 )))
2063 * (((
2064 (((
2065 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
2066 )))
2067 )))
2068
2069 (((
2070 (((
2071 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2072
2073
2074 )))
2075
2076 (((
2077 = 10. Reference​​​​​ =
2078
2079 * Product Page:
2080
2081 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]]
2082
2083 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2084 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2085 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2086 )))
2087 )))