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Version 77.27 by Xiaoling on 2022/06/10 08:41
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1 (% style="text-align:center" %)
2 [[image:image-20220523163353-1.jpeg||height="604" width="500"]]
3
4 **LT-22222-L LoRa IO Controller User Manual **
5
6
7 **Table of Contents:**
8
9 {{toc/}}
10
11
12
13
14
15
16
17 = 1.Introduction =
18
19 == 1.1 What is LT Series I/O Controller ==
20
21 (((
22 The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
23 )))
24
25 (((
26 The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
27 )))
28
29 (((
30 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
31 )))
32
33 (((
34 The use environment includes:
35 )))
36
37 (((
38 1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.
39 )))
40
41 (((
42 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
43 )))
44
45 (((
46 [[image:1653295757274-912.png]]
47
48
49 )))
50
51 == 1.2  Specifications ==
52
53 (((
54
55
56 **Hardware System:**
57 )))
58
59 * (((
60 STM32L072CZT6 MCU
61 )))
62 * (((
63 SX1276/78 Wireless Chip 
64 )))
65 * (((
66 (((
67 Power Consumption:
68 )))
69
70 * (((
71 Idle: 4mA@12v
72 )))
73 * (((
74 20dB Transmit: 34mA@12v
75 )))
76 )))
77
78
79 (((
80 **Interface for Model: LT22222-L:**
81 )))
82
83 * (((
84 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
85 )))
86 * (((
87 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
88 )))
89 * (((
90 2 x Relay Output (5A@250VAC / 30VDC)
91 )))
92 * (((
93 2 x 0~~20mA Analog Input (res:0.01mA)
94 )))
95 * (((
96 2 x 0~~30V Analog Input (res:0.01v)
97 )))
98 * (((
99 Power Input 7~~ 24V DC. 
100 )))
101
102
103 (((
104 **LoRa Spec:**
105 )))
106
107 * (((
108 (((
109 Frequency Range:
110 )))
111
112 * (((
113 Band 1 (HF): 862 ~~ 1020 Mhz
114 )))
115 * (((
116 Band 2 (LF): 410 ~~ 528 Mhz
117 )))
118 )))
119 * (((
120 168 dB maximum link budget.
121 )))
122 * (((
123 +20 dBm - 100 mW constant RF output vs.
124 )))
125 * (((
126 +14 dBm high efficiency PA.
127 )))
128 * (((
129 Programmable bit rate up to 300 kbps.
130 )))
131 * (((
132 High sensitivity: down to -148 dBm.
133 )))
134 * (((
135 Bullet-proof front end: IIP3 = -12.5 dBm.
136 )))
137 * (((
138 Excellent blocking immunity.
139 )))
140 * (((
141 Low RX current of 10.3 mA, 200 nA register retention.
142 )))
143 * (((
144 Fully integrated synthesizer with a resolution of 61 Hz.
145 )))
146 * (((
147 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
148 )))
149 * (((
150 Built-in bit synchronizer for clock recovery.
151 )))
152 * (((
153 Preamble detection.
154 )))
155 * (((
156 127 dB Dynamic Range RSSI.
157 )))
158 * (((
159 Automatic RF Sense and CAD with ultra-fast AFC.
160 )))
161 * (((
162 Packet engine up to 256 bytes with CRC.
163
164
165 )))
166
167
168
169 == 1.3 Features ==
170
171 * LoRaWAN Class A & Class C protocol
172 * Optional Customized LoRa Protocol
173 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
174 * AT Commands to change parameters
175 * Remote configure parameters via LoRa Downlink
176 * Firmware upgradable via program port
177 * Counting
178
179
180
181 == 1.4  Applications ==
182
183 * Smart Buildings & Home Automation
184 * Logistics and Supply Chain Management
185 * Smart Metering
186 * Smart Agriculture
187 * Smart Cities
188 * Smart Factory
189
190
191
192 == 1.5 Hardware Variants ==
193
194 (% border="1" style="background-color:#f7faff; width:500px" %)
195 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
196 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
197 * 2 x Digital Input (Bi-direction)
198 * 2 x Digital Output
199 * 2 x Relay Output (5A@250VAC / 30VDC)
200 * 2 x 0~~20mA Analog Input (res:0.01mA)
201 * 2 x 0~~30V Analog Input (res:0.01v)
202 * 1 x Counting Port
203 )))
204
205
206
207 = 2. Power ON Device =
208
209 The LT controller can be powered by 7 ~~ 24V DC power source. Connect VIN to Power Input V+ and GND to power input V- to power the LT controller.
210
211 (((
212 PWR will on when device is properly powered.
213 )))
214
215 [[image:1653297104069-180.png]]
216
217
218
219 = 3. Operation Mode =
220
221 == 3.1 How it works? ==
222
223 (((
224 The LT is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the LT. It will auto join the network via OTAA. For LT-22222-L, the LED will show the Join status: After power on **TX LED** will fast blink 5 times, LT-22222-L will enter working mode and start to JOIN LoRaWAN network. **TX LED** will be on for 5 seconds after joined in network. When there is message from server, the **RX LED** will be on for 1 second. 
225 )))
226
227 (((
228 In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>||anchor="H4.UseATCommand"]] to set the keys in the devices.
229
230
231 )))
232
233
234
235 == 3.2 Example to join LoRaWAN network ==
236
237 (((
238 This chapter shows an example for how to join the TTN LoRaWAN Network. Below is the network structure, we use our LG308 as LoRaWAN gateway here. 
239 )))
240
241 [[image:image-20220523172350-1.png||height="266" width="864"]]
242
243 (((
244 The LG308 is already set to connect to [[TTN network >>url:https://www.thethingsnetwork.org/]]. So what we need to do now is only configure register this device to TTN:
245 )))
246
247 (((
248 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
249 )))
250
251 (((
252 Each LT is shipped with a sticker with the default device EUI as below:
253 )))
254
255 [[image:1653297924498-393.png]]
256
257 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
258
259 Add APP EUI in the application.
260
261 [[image:1653297955910-247.png||height="321" width="716"]]
262
263
264 Add APP KEY and DEV EUI
265
266 [[image:1653298023685-319.png]]
267
268
269 (((
270 **Step 2**: Power on LT and it will auto join to the TTN network. After join success, it will start to upload message to TTN and user can see in the panel.
271 )))
272
273 [[image:1653298044601-602.png||height="405" width="709"]]
274
275
276
277 == 3.3 Uplink Payload ==
278
279 There are five working modes + one interrupt mode on LT for different type application:
280
281 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
282 * **MOD2**: Double DI Counting + DO + RO
283 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
284 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
285 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
286 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
287
288
289
290 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
291
292 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
293
294 [[image:image-20220523174024-3.png]]
295
296 (((
297 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
298 )))
299
300 [[image:image-20220523174254-4.png]]
301
302 * RO is for relay. ROx=1 : close，ROx=0 always open.
303 * DI is for digital input. DIx=1: high or float, DIx=0: low.
304 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
305
306 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
307
308 For example if payload is: [[image:image-20220523175847-2.png]]
309
310 **The value for the interface is:  **
311
312 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
313
314 AVI2 channel voltage is 0x04AC/1000=1.196V
315
316 ACI1 channel current is 0x1310/1000=4.880mA
317
318 ACI2 channel current is 0x1300/1000=4.864mA
319
320 The last byte 0xAA= 10101010(B) means
321
322 * [1] RO1 relay channel is close and the RO1 LED is ON.
323 * [0] RO2 relay channel is open and RO2 LED is OFF;
324
325
326 **LT22222-L:**
327
328 * [1] DI2 channel is high input and DI2 LED is ON;
329 * [0] DI1 channel is low input;
330
331 * [0] DO3 channel output state
332 ** DO3 is float in case no load between DO3 and V+.;
333 ** DO3 is high in case there is load between DO3 and V+.
334 ** DO3 LED is off in both case
335 * [1] DO2 channel output is low and DO2 LED is ON.
336 * [0] DO1 channel output state
337 ** DO1 is float in case no load between DO1 and V+.;
338 ** DO1 is high in case there is load between DO1 and V+.
339 ** DO1 LED is off in both case
340
341
342
343 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
344
345 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
346
347 (((
348 Total : 11 bytes payload
349 )))
350
351 [[image:image-20220523180452-3.png]]
352
353 (((
354 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
355 )))
356
357 [[image:image-20220523180506-4.png]]
358
359 * RO is for relay. ROx=1 : close，ROx=0 always open.
360 * FIRST: Indicate this is the first packet after join network.
361 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
362
363 (((
364 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
365 )))
366
367 (((
368 **To use counting mode, please run:**
369 )))
370
371 (% class="box infomessage" %)
372 (((
373 (((
374 **AT+MOD=2**
375 )))
376 )))
377
378 (% class="box infomessage" %)
379 (((
380 (((
381 **ATZ**
382 )))
383 )))
384
385 (((
386 (% style="color:#4f81bd" %)**AT Commands for counting:**
387 )))
388
389 (((
390 **For LT22222-L:**
391 )))
392
393 (% class="box infomessage" %)
394 (((
395 (((
396 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
397 )))
398 )))
399
400 (% class="box infomessage" %)
401 (((
402 (((
403 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
404 )))
405 )))
406
407 (% class="box infomessage" %)
408 (((
409 (((
410 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
411 )))
412 )))
413
414 (% class="box infomessage" %)
415 (((
416 (((
417 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
418 )))
419 )))
420
421 (% class="box infomessage" %)
422 (((
423 (((
424 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
425 )))
426 )))
427
428 (% class="box infomessage" %)
429 (((
430 (((
431 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
432 )))
433 )))
434
435
436
437 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
438
439 **LT22222-L**: This mode the DI1 is used as a counting pin.
440
441 [[image:image-20220523181246-5.png]]
442
443 (((
444 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
445 )))
446
447 [[image:image-20220523181301-6.png]]
448
449 * RO is for relay. ROx=1 : close，ROx=0 always open.
450 * FIRST: Indicate this is the first packet after join network.
451 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
452
453 (((
454 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
455 )))
456
457 (((
458 **To use counting mode, please run:**
459 )))
460
461 (% class="box infomessage" %)
462 (((
463 (((
464 **AT+MOD=3**
465 )))
466 )))
467
468 (% class="box infomessage" %)
469 (((
470 (((
471 **ATZ**
472 )))
473 )))
474
475 (((
476 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
477
478
479 )))
480
481
482
483 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
484
485 **LT22222-L**: This mode the DI1 is used as a counting pin.
486
487 The AVI1 is also used for counting. AVI1 is used to monitor the voltage. It will check the voltage **every 60s**, if voltage is higher or lower than VOLMAX mV, the AVI1 Counting increase 1, so AVI1 counting can be used to measure a machine working hour.
488
489 [[image:image-20220523181903-8.png]]
490
491 (((
492 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
493 )))
494
495 [[image:image-20220523181727-7.png]]
496
497 * RO is for relay. ROx=1 : close，ROx=0 always open.
498 * FIRST: Indicate this is the first packet after join network.
499 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
500
501 (((
502 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
503 )))
504
505 (((
506 **To use this mode, please run:**
507 )))
508
509 (% class="box infomessage" %)
510 (((
511 (((
512 **AT+MOD=4**
513 )))
514 )))
515
516 (% class="box infomessage" %)
517 (((
518 (((
519 **ATZ**
520 )))
521 )))
522
523 (((
524
525 )))
526
527 (((
528 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
529 )))
530
531 (((
532 **Plus below command for AVI1 Counting:**
533 )))
534
535 (% class="box infomessage" %)
536 (((
537 (((
538 **AT+SETCNT=3,60   (set AVI Count to 60)**
539 )))
540 )))
541
542 (% class="box infomessage" %)
543 (((
544 (((
545 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
546 )))
547 )))
548
549 (% class="box infomessage" %)
550 (((
551 (((
552 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
553 )))
554 )))
555
556 (% class="box infomessage" %)
557 (((
558 (((
559 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
560 )))
561 )))
562
563
564
565 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
566
567 **LT22222-L**: This mode the DI1 is used as a counting pin.
568
569 [[image:image-20220523182334-9.png]]
570
571 (((
572 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
573 )))
574
575 * RO is for relay. ROx=1 : close，ROx=0 always open.
576 * FIRST: Indicate this is the first packet after join network.
577 * (((
578 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
579 )))
580
581 (((
582 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
583 )))
584
585 (((
586 **To use this mode, please run:**
587 )))
588
589 (% class="box infomessage" %)
590 (((
591 (((
592 **AT+MOD=5**
593 )))
594 )))
595
596 (% class="box infomessage" %)
597 (((
598 (((
599 **ATZ**
600 )))
601 )))
602
603 (((
604 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
605
606
607 )))
608
609
610
611 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
612
613 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
614
615 For example, if user has configured below commands:
616
617 * **AT+MOD=1 ** **~-~->** The normal working mode
618 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
619
620 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
621
622 1. Periodically uplink (Base on TDC time). Payload is same as the normal MOD (MOD 1 for above command). This uplink uses LoRaWAN (% style="color:#4f81bd" %)**unconfirmed**(%%) data type
623 1. Trigger uplink when meet the trigger condition. LT will sent two packets in this case, the first uplink use payload specify in this mod (mod=6), the second packets use the normal mod payload(MOD=1 for above settings). Both Uplinks use LoRaWAN (% style="color:#4f81bd" %)**CONFIRMED data type.**
624
625 **AT Command to set Trigger Condition**:
626
627 (% style="color:#4f81bd" %)**Trigger base on voltage**:
628
629 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
630
631 **Example:**
632
633 AT+AVLIM=3000,6000,0,2000   (If AVI1 voltage lower than 3v or higher than 6v. or AV2 voltage is higher than 2v, LT will trigger Uplink)
634
635 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
636
637
638 (% style="color:#4f81bd" %)**Trigger base on current**:
639
640 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
641
642 **Example:**
643
644 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
645
646
647 (% style="color:#4f81bd" %)**Trigger base on DI status**:
648
649 DI status trigger Flag.
650
651 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
652
653 **Example:**
654
655 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
656
657
658 **Downlink Command to set Trigger Condition**
659
660 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
661
662 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
663
664 AA: Code for this downlink Command:
665
666 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
667
668 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
669
670 yy2 yy2: AC1 or AV1 high limit.
671
672 yy3 yy3: AC2 or AV2 low limit.
673
674 Yy4 yy4: AC2 or AV2 high limit.
675
676 **Example1**: AA 00 13 88 00 00 00 00 00 00
677
678 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
679
680 **Example2**: AA 02 01 00
681
682 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
683
684 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
685
686 MOD6 Payload : total 11 bytes payload
687
688 [[image:image-20220524085923-1.png]]
689
690 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
691
692 [[image:image-20220524090106-2.png]]
693
694 * Each bits shows if the corresponding trigger has been configured.
695
696 **Example:**
697
698 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
699
700
701 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
702
703 [[image:image-20220524090249-3.png]]
704
705 * Each bits shows which status has been trigger on this uplink.
706
707 **Example:**
708
709 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
710
711
712 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
713
714 [[image:image-20220524090456-4.png]]
715
716 * Each bits shows which status has been trigger on this uplink.
717
718 **Example:**
719
720 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
721
722 00000101: Means both DI1 and DI2 trigger are enabled.
723
724
725 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
726
727 Downlink command to poll MOD6 status:
728
729 **AB 06**
730
731 When device got this command, it will send the MOD6 payload.
732
733
734
735 === 3.3.7 Payload Decoder ===
736
737 (((
738 **Decoder for TTN/loraserver/ChirpStack**: [[http:~~/~~/www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/Payload_decoder/>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/Payload_decoder/]]
739
740
741 )))
742
743
744
745 == 3.4 ​Configure LT via AT or Downlink ==
746
747 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
748
749 (((
750 There are two kinds of Commands:
751 )))
752
753 * (% style="color:#4f81bd" %)**Common Commands**(%%): They should be available for each sensor, such as: change uplink interval, reset device. For firmware v1.5.4, user can find what common commands it supports: [[End Device AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
754
755 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
756
757
758
759 === 3.4.1 Common Commands ===
760
761 They should be available for each of Dragino Sensors, such as: change uplink interval, reset device. For firmware v1.5.4, user can find what common commands it supports: [[End Device AT Commands and Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]]
762
763
764
765 === 3.4.2 Sensor related commands ===
766
767 ==== 3.4.2.1 Set Transmit Interval ====
768
769 Set device uplink interval.
770
771 * AT Command:
772
773 (% class="box infomessage" %)
774 (((
775 **AT+TDC=N **
776 )))
777
778 **Example: **AT+TDC=30000. Means set interval to 30 seconds
779
780 * Downlink Payload (prefix 0x01):
781
782 (% class="box infomessage" %)
783 (((
784 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
785 )))
786
787
788
789 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
790
791 Set work mode.
792
793 * AT Command:
794
795 (% class="box infomessage" %)
796 (((
797 **AT+MOD=N  **
798 )))
799
800 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
801
802 * Downlink Payload (prefix 0x0A):
803
804 (% class="box infomessage" %)
805 (((
806 **0x0A aa     ~/~/ Same as AT+MOD=aa**
807 )))
808
809
810
811 ==== 3.4.2.3 Poll an uplink ====
812
813 * AT Command:
814
815 There is no AT Command to poll uplink
816
817 * Downlink Payload (prefix 0x08):
818
819 (% class="box infomessage" %)
820 (((
821 **0x08 FF     ~/~/ Poll an uplink,**
822 )))
823
824 **Example**: 0x08FF, ask device to send an Uplink
825
826
827
828 ==== 3.4.2.4 Enable Trigger Mode ====
829
830 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
831
832 * AT Command:
833
834 (% class="box infomessage" %)
835 (((
836 **AT+ADDMOD6=1 or 0**
837 )))
838
839 1: Enable Trigger Mode
840
841 0: Disable Trigger Mode
842
843 * Downlink Payload (prefix 0x0A 06):
844
845 (% class="box infomessage" %)
846 (((
847 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
848 )))
849
850
851
852 ==== 3.4.2.5 Poll trigger settings ====
853
854 Poll trigger settings,
855
856 * AT Command:
857
858 There is no AT Command for this feature.
859
860 * Downlink Payload (prefix 0x AB 06):
861
862 (% class="box infomessage" %)
863 (((
864 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
865 )))
866
867
868
869 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
870
871 Enable Disable DI1/DI2/DI2 as trigger,
872
873 * AT Command:
874
875 (% class="box infomessage" %)
876 (((
877 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
878 )))
879
880 **Example:**
881
882 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
883
884 * Downlink Payload (prefix 0xAA 02):
885
886 (% class="box infomessage" %)
887 (((
888 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
889 )))
890
891
892
893 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
894
895 Set DI1 or DI3(for LT-33222-L) trigger.
896
897 * AT Command:
898
899 (% class="box infomessage" %)
900 (((
901 **AT+TRIG1=a,b**
902 )))
903
904 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
905
906 b : delay timing.
907
908 **Example:**
909
910 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
911
912 * Downlink Payload (prefix 0x09 01 ):
913
914 (% class="box infomessage" %)
915 (((
916 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
917 )))
918
919
920
921 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
922
923 Set DI2 trigger.
924
925 * AT Command:
926
927 (% class="box infomessage" %)
928 (((
929 **AT+TRIG2=a,b**
930 )))
931
932 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
933
934 b : delay timing.
935
936 **Example:**
937
938 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
939
940 * Downlink Payload (prefix 0x09 02 ):
941
942 (% class="box infomessage" %)
943 (((
944 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
945 )))
946
947
948
949 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
950
951 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
952
953 * AT Command:
954
955 (% class="box infomessage" %)
956 (((
957 **AT+ACLIM. **
958 )))
959
960 * Downlink Payload (prefix 0xAA 01 ):
961
962 (% class="box infomessage" %)
963 (((
964 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
965 )))
966
967
968
969 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
970
971 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
972
973 * AT Command:
974
975 (% class="box infomessage" %)
976 (((
977 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
978 )))
979
980 * Downlink Payload (prefix 0xAA 00 ):
981
982 (% class="box infomessage" %)
983 (((
984 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
985 )))
986
987
988 ==== 3.4.2.11 Trigger – Set minimum interval ====
989
990 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
991
992 * AT Command:
993
994 (% class="box infomessage" %)
995 (((
996 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
997 )))
998
999 * Downlink Payload (prefix 0xAC ):
1000
1001 (% class="box infomessage" %)
1002 (((
1003 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
1004 )))
1005
1006
1007 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1008
1009 * AT Command:
1010
1011 There is no AT Command to control Digital Output
1012
1013 * Downlink Payload (prefix 0x02):
1014
1015 (% class="box infomessage" %)
1016 (((
1017 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1018 )))
1019
1020 (((
1021 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1022 )))
1023
1024 (((
1025 01: Low,  00: High ,  11: No action
1026 )))
1027
1028 [[image:image-20220524092754-5.png]]
1029
1030 (((
1031 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1032 )))
1033
1034 (((
1035 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1036 )))
1037
1038
1039 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1040
1041 * AT Command:
1042
1043 There is no AT Command to control Digital Output
1044
1045 * Downlink Payload (prefix 0xA9):
1046
1047 (% class="box infomessage" %)
1048 (((
1049 (((
1050 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1051 )))
1052 )))
1053
1054 This is to control the digital output time of DO pin. Include four bytes:
1055
1056 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1057
1058 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1059
1060 01: DO pins will change back to original state after timeout.
1061
1062 00: DO pins will change to an inverter state after timeout 
1063
1064 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1065
1066 [[image:image-20220524093238-6.png]]
1067
1068 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1069
1070 [[image:image-20220524093328-7.png]]
1071
1072 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1073
1074 [[image:image-20220524093351-8.png]]
1075
1076 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1077
1078 Latching time. Unit: ms
1079
1080 Device will upload a packet if downlink code executes successfully.
1081
1082 **Example payload:**
1083
1084 **~1. A9 01 01 01 01 07 D0**
1085
1086 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1087
1088 **2. A9 01 00 01 11 07 D0**
1089
1090 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1091
1092 **3. A9 00 00 00 00 07 D0**
1093
1094 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1095
1096 **4. A9 00 11 01 00 07 D0**
1097
1098 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
1099
1100
1101 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1102
1103 * AT Command:
1104
1105 There is no AT Command to control Relay Output
1106
1107 * Downlink Payload (prefix 0x03):
1108
1109 (% class="box infomessage" %)
1110 (((
1111 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1112 )))
1113
1114 (((
1115 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1116 )))
1117
1118 (((
1119 01: Close ,  00: Open , 11: No action
1120 )))
1121
1122 (((
1123 [[image:image-20220524093724-9.png]]
1124 )))
1125
1126 Device will upload a packet if downlink code executes successfully.
1127
1128
1129 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1130
1131 * AT Command:
1132
1133 There is no AT Command to control Relay Output
1134
1135 * Downlink Payload (prefix 0x05):
1136
1137 (% class="box infomessage" %)
1138 (((
1139 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1140 )))
1141
1142 This is to control the relay output time of relay. Include four bytes:
1143
1144 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1145
1146 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1147
1148 01: Relays will change back to original state after timeout.
1149
1150 00: Relays will change to an inverter state after timeout
1151
1152 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1153
1154 [[image:image-20220524093831-10.png]]
1155
1156 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1157
1158 Device will upload a packet if downlink code executes successfully.
1159
1160 **Example payload:**
1161
1162 **~1. 05 01 11 07 D0**
1163
1164 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1165
1166 **2. 05 01 10 07 D0**
1167
1168 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1169
1170 **3. 05 00 01 07 D0**
1171
1172 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1173
1174 **4. 05 00 00 07 D0**
1175
1176 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1177
1178
1179 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1180
1181 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1182
1183 * AT Command:
1184
1185 (% class="box infomessage" %)
1186 (((
1187 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1188 )))
1189
1190 * Downlink Payload (prefix 0xA5):
1191
1192 (% class="box infomessage" %)
1193 (((
1194 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1195 )))
1196
1197
1198 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1199
1200 * AT Command:
1201
1202 (% class="box infomessage" %)
1203 (((
1204 **AT+SETCNT=aa,(bb cc dd ee) **
1205 )))
1206
1207 aa: 1: Set count1,
1208
1209 2: Set count2,
1210
1211 3: Set AV1 count
1212
1213 Bb cc dd ee: number to be set
1214
1215 * Downlink Payload (prefix 0xA8):
1216
1217 (% class="box infomessage" %)
1218 (((
1219 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1220 )))
1221
1222
1223 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1224
1225 Clear counting for counting mode
1226
1227 * AT Command:
1228
1229 (% class="box infomessage" %)
1230 (((
1231 **AT+CLRCOUNT ~/~/ clear all counting**
1232 )))
1233
1234 * Downlink Payload (prefix 0xA6):
1235
1236 (% class="box infomessage" %)
1237 (((
1238 **0x A6 01     ~/~/ clear all counting,**
1239 )))
1240
1241
1242 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1243
1244 * AT Command:
1245
1246 (% class="box infomessage" %)
1247 (((
1248 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1249 )))
1250
1251 * Downlink Payload (prefix 0xA7):
1252
1253 (% class="box infomessage" %)
1254 (((
1255 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1256 )))
1257
1258 (((
1259 range: aa bb cc:0 to 16777215,  (unit:second)
1260
1261
1262 )))
1263
1264 == 3.5 Integrate with Mydevice ==
1265
1266 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:
1267
1268 (((
1269 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1270 )))
1271
1272 (((
1273 **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:
1274 )))
1275
1276 [[image:1653356737703-362.png||height="232" width="732"]]
1277
1278 [[image:image-20220524094641-11.png||height="390" width="723"]]
1279
1280 [[image:image-20220524094641-12.png||height="402" width="718"]]
1281
1282
1283 **Step 3**: Create an account or log in Mydevices.
1284
1285 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1286
1287 Search under The things network
1288
1289 [[image:1653356838789-523.png||height="337" width="740"]]
1290
1291
1292 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1293
1294 [[image:image-20220524094909-1.png||height="335" width="729"]]
1295
1296 [[image:image-20220524094909-2.png||height="337" width="729"]]
1297
1298 [[image:image-20220524094909-3.png||height="338" width="727"]]
1299
1300 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1301
1302 [[image:image-20220524094909-5.png||height="341" width="734"]]
1303
1304
1305 == 3.6 Interface Detail ==
1306
1307 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1308
1309 Support NPN Type sensor
1310
1311 [[image:1653356991268-289.png]]
1312
1313
1314 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1315
1316 (((
1317 The DI port of LT-22222-L can support NPN or PNP output sensor.
1318 )))
1319
1320 (((
1321 (((
1322 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
1323 )))
1324 )))
1325
1326 [[image:1653357170703-587.png]]
1327
1328 (((
1329 (((
1330 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1331 )))
1332 )))
1333
1334 (((
1335
1336 )))
1337
1338 (((
1339 **Example1**: Connect to a Low active sensor.
1340 )))
1341
1342 (((
1343 This type of sensor will output a low signal GND when active.
1344 )))
1345
1346 * (((
1347 Connect sensor’s output to DI1-
1348 )))
1349 * (((
1350 Connect sensor’s VCC to DI1+.
1351 )))
1352
1353 (((
1354 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1355 )))
1356
1357 (((
1358 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1359 )))
1360
1361 (((
1362 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.
1363 )))
1364
1365 (((
1366
1367 )))
1368
1369 (((
1370 **Example2**: Connect to a High active sensor.
1371 )))
1372
1373 (((
1374 This type of sensor will output a high signal (example 24v) when active.
1375 )))
1376
1377 * (((
1378 Connect sensor’s output to DI1+
1379 )))
1380 * (((
1381 Connect sensor’s GND DI1-.
1382 )))
1383
1384 (((
1385 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1386 )))
1387
1388 (((
1389 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1390 )))
1391
1392 (((
1393 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.
1394 )))
1395
1396 (((
1397
1398 )))
1399
1400 (((
1401 **Example3**: Connect to a 220v high active sensor.
1402 )))
1403
1404 (((
1405 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1406 )))
1407
1408 * (((
1409 Connect sensor’s output to DI1+ with a serial 50K resistor
1410 )))
1411 * (((
1412 Connect sensor’s GND DI1-.
1413 )))
1414
1415 (((
1416 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1417 )))
1418
1419 (((
1420 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1421 )))
1422
1423 (((
1424 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.
1425 )))
1426
1427
1428 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1429
1430 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1431
1432 [[image:1653357531600-905.png]]
1433
1434
1435 === 3.6.4 Analog Input Interface ===
1436
1437 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:
1438
1439 **AC2 = (IN2 voltage )/12**
1440
1441 [[image:1653357592296-182.png]]
1442
1443 Example to connect a 4~~20mA sensor
1444
1445 We take the wind speed sensor as an example for reference only.
1446
1447 Specifications of the wind speed sensor:
1448
1449 Red:12~~24v
1450
1451 Yellow:4~~20mA
1452
1453 Black:GND
1454
1455
1456 Connection diagram:
1457
1458 [[image:1653357640609-758.png]]
1459
1460 [[image:1653357648330-671.png||height="155" width="733"]]
1461
1462
1463 === 3.6.5 Relay Output ===
1464
1465 (((
1466 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:
1467 )))
1468
1469 [[image:image-20220524100215-9.png]]
1470
1471 [[image:image-20220524100215-10.png||height="382" width="723"]]
1472
1473
1474 == 3.7 LEDs Indicators ==
1475
1476 [[image:image-20220524100748-11.png]]
1477
1478
1479 = 4. Use AT Command =
1480
1481 == 4.1 Access AT Command ==
1482
1483 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.
1484
1485 [[image:1653358238933-385.png]]
1486
1487 (((
1488 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:
1489 )))
1490
1491 [[image:1653358355238-883.png]]
1492
1493 (((
1494 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/]]
1495 )))
1496
1497 (((
1498 AT+<CMD>?        : Help on <CMD>
1499 )))
1500
1501 (((
1502 AT+<CMD>         : Run <CMD>
1503 )))
1504
1505 (((
1506 AT+<CMD>=<value> : Set the value
1507 )))
1508
1509 (((
1510 AT+<CMD>=?       : Get the value
1511 )))
1512
1513 (((
1514 ATZ: Trig a reset of the MCU
1515 )))
1516
1517 (((
1518 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1519 )))
1520
1521 (((
1522 AT+DEUI: Get or Set the Device EUI
1523 )))
1524
1525 (((
1526 AT+DADDR: Get or Set the Device Address
1527 )))
1528
1529 (((
1530 AT+APPKEY: Get or Set the Application Key
1531 )))
1532
1533 (((
1534 AT+NWKSKEY: Get or Set the Network Session Key
1535 )))
1536
1537 (((
1538 AT+APPSKEY: Get or Set the Application Session Key
1539 )))
1540
1541 (((
1542 AT+APPEUI: Get or Set the Application EUI
1543 )))
1544
1545 (((
1546 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1547 )))
1548
1549 (((
1550 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1551 )))
1552
1553 (((
1554 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1555 )))
1556
1557 (((
1558 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1559 )))
1560
1561 (((
1562 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1563 )))
1564
1565 (((
1566 AT+RX2FQ: Get or Set the Rx2 window frequency
1567 )))
1568
1569 (((
1570 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1571 )))
1572
1573 (((
1574 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1575 )))
1576
1577 (((
1578 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1579 )))
1580
1581 (((
1582 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1583 )))
1584
1585 (((
1586 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1587 )))
1588
1589 (((
1590 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1591 )))
1592
1593 (((
1594 AT+NWKID: Get or Set the Network ID
1595 )))
1596
1597 (((
1598 AT+FCU: Get or Set the Frame Counter Uplink
1599 )))
1600
1601 (((
1602 AT+FCD: Get or Set the Frame Counter Downlink
1603 )))
1604
1605 (((
1606 AT+CLASS: Get or Set the Device Class
1607 )))
1608
1609 (((
1610 AT+JOIN: Join network
1611 )))
1612
1613 (((
1614 AT+NJS: Get OTAA Join Status
1615 )))
1616
1617 (((
1618 AT+SENDB: Send hexadecimal data along with the application port
1619 )))
1620
1621 (((
1622 AT+SEND: Send text data along with the application port
1623 )))
1624
1625 (((
1626 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1627 )))
1628
1629 (((
1630 AT+RECV: Print last received data in raw format
1631 )))
1632
1633 (((
1634 AT+VER: Get current image version and Frequency Band
1635 )))
1636
1637 (((
1638 AT+CFM: Get or Set the confirmation mode (0-1)
1639 )))
1640
1641 (((
1642 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1643 )))
1644
1645 (((
1646 AT+SNR: Get the SNR of the last received packet
1647 )))
1648
1649 (((
1650 AT+RSSI: Get the RSSI of the last received packet
1651 )))
1652
1653 (((
1654 AT+TDC: Get or set the application data transmission interval in ms
1655 )))
1656
1657 (((
1658 AT+PORT: Get or set the application port
1659 )))
1660
1661 (((
1662 AT+DISAT: Disable AT commands
1663 )))
1664
1665 (((
1666 AT+PWORD: Set password, max 9 digits
1667 )))
1668
1669 (((
1670 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1671 )))
1672
1673 (((
1674 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1675 )))
1676
1677 (((
1678 AT+CFG: Print all settings
1679
1680
1681 )))
1682
1683 == 4.2 Common AT Command Sequence ==
1684
1685 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1686
1687 (((
1688 If device has not joined network yet:
1689 )))
1690
1691 (((
1692 (% style="background-color:#dcdcdc" %)123456
1693 )))
1694
1695 (((
1696 (% style="background-color:#dcdcdc" %)AT+FDR
1697 )))
1698
1699 (((
1700 (% style="background-color:#dcdcdc" %)123456
1701 )))
1702
1703 (((
1704 (% style="background-color:#dcdcdc" %)AT+NJM=0
1705 )))
1706
1707 (((
1708 (% style="background-color:#dcdcdc" %)ATZ
1709 )))
1710
1711
1712 (((
1713 If device already joined network:
1714 )))
1715
1716 (((
1717 (% style="background-color:#dcdcdc" %)AT+NJM=0
1718 )))
1719
1720 (((
1721 (% style="background-color:#dcdcdc" %)ATZ
1722
1723
1724 )))
1725
1726 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1727
1728 (((
1729 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1730 )))
1731
1732 (((
1733 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1734 )))
1735
1736 (((
1737 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1738 )))
1739
1740 (((
1741 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1742 )))
1743
1744 (((
1745 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1746 )))
1747
1748 (((
1749 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1750 )))
1751
1752 (((
1753 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1754 )))
1755
1756 (((
1757 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1758 )))
1759
1760 (((
1761 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1762 )))
1763
1764 (((
1765 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1766 )))
1767
1768 (((
1769 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1770 )))
1771
1772 (((
1773 (% 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.
1774 )))
1775
1776 (((
1777 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1778 )))
1779
1780 (((
1781 (% style="color:red" %)**Note:**
1782 )))
1783
1784 (((
1785 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1786 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1787 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.
1788 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
1789 )))
1790
1791 (((
1792 [[image:1653359097980-169.png||height="188" width="729"]]
1793 )))
1794
1795 (((
1796
1797 )))
1798
1799 === 4.2.3 Change to Class A ===
1800
1801 If sensor JOINED
1802 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1803 ATZ
1804
1805
1806 = 5. FAQ =
1807
1808 == 5.1 How to upgrade the image? ==
1809
1810 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1811
1812 * Support new features
1813 * For bug fix
1814 * Change LoRaWAN bands.
1815 Below shows the hardware connection for how to upload an image to the LT:
1816 * [[image:1653359603330-121.png]]
1817
1818 (((
1819 **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]].
1820 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1821 **Step3: **Open flashloader; choose the correct COM port to update.
1822 **For LT-22222-L**:
1823 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.
1824 )))
1825
1826 [[image:image-20220524103407-12.png]]
1827
1828 [[image:image-20220524103429-13.png]]
1829
1830 [[image:image-20220524104033-15.png]]
1831
1832 (% 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:
1833
1834 [[image:1653360054704-518.png||height="186" width="745"]]
1835
1836
1837 (((
1838 (((
1839 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1840 )))
1841 )))
1842
1843 (((
1844 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1845
1846
1847 )))
1848
1849 (((
1850 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1851 )))
1852
1853 (((
1854 (((
1855 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1856 )))
1857 )))
1858
1859 (((
1860 (((
1861 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1862 )))
1863 )))
1864
1865 (((
1866 (% 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.
1867 )))
1868
1869 (((
1870 [[image:1653360231087-571.png||height="401" width="727"]]
1871 )))
1872
1873 (((
1874 (% 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.
1875 )))
1876
1877 (((
1878 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1879 )))
1880
1881 (((
1882 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1883 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1884 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1885 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1886 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1887 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1888 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1889 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1890 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1891 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1892 )))
1893
1894 (((
1895 As shown in below:
1896 )))
1897
1898 [[image:1653360498588-932.png||height="485" width="726"]]
1899
1900
1901 == 5.4 Can I see counting event in Serial? ==
1902
1903 (((
1904 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.
1905
1906
1907 == 5.5 Can i use point to point communication for LT-22222-L? ==
1908
1909 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1910
1911
1912 )))
1913
1914 (((
1915 = 6. Trouble Shooting =
1916 )))
1917
1918 (((
1919 (((
1920 == 6.1 Downlink doesn’t work, how to solve it? ==
1921 )))
1922 )))
1923
1924 (((
1925 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1926
1927
1928 )))
1929
1930 (((
1931 == 6.2 Have trouble to upload image. ==
1932 )))
1933
1934 (((
1935 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1936 )))
1937
1938 (((
1939
1940 )))
1941
1942 (((
1943 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1944 )))
1945
1946 (((
1947 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1948 )))
1949
1950 (((
1951
1952 )))
1953
1954 (((
1955 = 7. Order Info =
1956 )))
1957
1958 (((
1959 (((
1960 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1961 )))
1962 )))
1963
1964 (((
1965 (((
1966 (% style="color:#4f81bd" %)**XXX:**
1967 )))
1968 )))
1969
1970 (((
1971 * (((
1972 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1973 )))
1974 )))
1975
1976 (((
1977 * (((
1978 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1979 )))
1980 )))
1981
1982 (((
1983 * (((
1984 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1985 )))
1986 )))
1987
1988 (((
1989 * (((
1990 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1991 )))
1992 )))
1993
1994 (((
1995 * (((
1996 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1997 )))
1998 )))
1999
2000 (((
2001 * (((
2002 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
2003 )))
2004 )))
2005
2006 (((
2007 * (((
2008 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2009 )))
2010 )))
2011
2012 (((
2013 * (((
2014 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2015 )))
2016 )))
2017
2018 (((
2019 * (((
2020 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2021
2022
2023 )))
2024
2025 = 8. Packing Info =
2026 )))
2027
2028 (((
2029 (((
2030 **Package Includes**:
2031 )))
2032 )))
2033
2034 (((
2035 (((
2036 * LT-22222-L I/O Controller x 1
2037 * Stick Antenna for LoRa RF part x 1
2038 * Bracket for controller x1
2039 * Program cable x 1
2040 )))
2041 )))
2042
2043 (((
2044 (((
2045 **Dimension and weight**:
2046 )))
2047 )))
2048
2049 (((
2050 (((
2051 * Device Size: 13.5 x 7 x 3 cm
2052 * Device Weight: 105g
2053 * Package Size / pcs : 14.5 x 8 x 5 cm
2054 * Weight / pcs : 170g
2055
2056
2057 )))
2058 )))
2059
2060 (((
2061 = 9. Support =
2062 )))
2063
2064 * (((
2065 (((
2066 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.
2067 )))
2068 )))
2069 * (((
2070 (((
2071 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
2072 )))
2073 )))
2074
2075 (((
2076 (((
2077 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2078
2079
2080 )))
2081
2082 (((
2083 = 10. Reference​​​​​ =
2084
2085 * Product Page:
2086
2087 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]]
2088
2089 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2090 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2091 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2092 )))
2093 )))