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Version 77.87 by Xiaoling on 2022/06/10 09:27
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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 **Interface for Model: LT22222-L:**
80 )))
81
82 * (((
83 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
84 )))
85 * (((
86 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
87 )))
88 * (((
89 2 x Relay Output (5A@250VAC / 30VDC)
90 )))
91 * (((
92 2 x 0~~20mA Analog Input (res:0.01mA)
93 )))
94 * (((
95 2 x 0~~30V Analog Input (res:0.01v)
96 )))
97 * (((
98 Power Input 7~~ 24V DC. 
99 )))
100
101 (((
102 **LoRa Spec:**
103 )))
104
105 * (((
106 (((
107 Frequency Range:
108 )))
109
110 * (((
111 Band 1 (HF): 862 ~~ 1020 Mhz
112 )))
113 * (((
114 Band 2 (LF): 410 ~~ 528 Mhz
115 )))
116 )))
117 * (((
118 168 dB maximum link budget.
119 )))
120 * (((
121 +20 dBm - 100 mW constant RF output vs.
122 )))
123 * (((
124 +14 dBm high efficiency PA.
125 )))
126 * (((
127 Programmable bit rate up to 300 kbps.
128 )))
129 * (((
130 High sensitivity: down to -148 dBm.
131 )))
132 * (((
133 Bullet-proof front end: IIP3 = -12.5 dBm.
134 )))
135 * (((
136 Excellent blocking immunity.
137 )))
138 * (((
139 Low RX current of 10.3 mA, 200 nA register retention.
140 )))
141 * (((
142 Fully integrated synthesizer with a resolution of 61 Hz.
143 )))
144 * (((
145 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
146 )))
147 * (((
148 Built-in bit synchronizer for clock recovery.
149 )))
150 * (((
151 Preamble detection.
152 )))
153 * (((
154 127 dB Dynamic Range RSSI.
155 )))
156 * (((
157 Automatic RF Sense and CAD with ultra-fast AFC.
158 )))
159 * (((
160 Packet engine up to 256 bytes with CRC.
161
162
163 )))
164
165 == 1.3 Features ==
166
167 * LoRaWAN Class A & Class C protocol
168 * Optional Customized LoRa Protocol
169 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
170 * AT Commands to change parameters
171 * Remote configure parameters via LoRa Downlink
172 * Firmware upgradable via program port
173 * Counting
174
175 == 1.4  Applications ==
176
177 * Smart Buildings & Home Automation
178 * Logistics and Supply Chain Management
179 * Smart Metering
180 * Smart Agriculture
181 * Smart Cities
182 * Smart Factory
183
184 == 1.5 Hardware Variants ==
185
186 (% border="1" style="background-color:#f7faff; width:500px" %)
187 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
188 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
189 * 2 x Digital Input (Bi-direction)
190 * 2 x Digital Output
191 * 2 x Relay Output (5A@250VAC / 30VDC)
192 * 2 x 0~~20mA Analog Input (res:0.01mA)
193 * 2 x 0~~30V Analog Input (res:0.01v)
194 * 1 x Counting Port
195 )))
196
197 = 2. Power ON Device =
198
199 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.
200
201 (((
202 PWR will on when device is properly powered.
203 )))
204
205 [[image:1653297104069-180.png]]
206
207
208
209 = 3. Operation Mode =
210
211 == 3.1 How it works? ==
212
213 (((
214 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. 
215 )))
216
217 (((
218 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.
219
220
221 )))
222
223
224
225 == 3.2 Example to join LoRaWAN network ==
226
227 (((
228 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. 
229 )))
230
231 [[image:image-20220523172350-1.png||height="266" width="864"]]
232
233 (((
234 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:
235 )))
236
237 (((
238 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
239 )))
240
241 (((
242 Each LT is shipped with a sticker with the default device EUI as below:
243 )))
244
245 [[image:1653297924498-393.png]]
246
247 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
248
249 Add APP EUI in the application.
250
251 [[image:1653297955910-247.png||height="321" width="716"]]
252
253
254 Add APP KEY and DEV EUI
255
256 [[image:1653298023685-319.png]]
257
258
259 (((
260 **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.
261 )))
262
263 [[image:1653298044601-602.png||height="405" width="709"]]
264
265
266
267 == 3.3 Uplink Payload ==
268
269 There are five working modes + one interrupt mode on LT for different type application:
270
271 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
272 * **MOD2**: Double DI Counting + DO + RO
273 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
274 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
275 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
276 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
277
278 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
279
280 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
281
282 [[image:image-20220523174024-3.png]]
283
284 (((
285 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
286 )))
287
288 [[image:image-20220523174254-4.png]]
289
290 * RO is for relay. ROx=1 : close，ROx=0 always open.
291 * DI is for digital input. DIx=1: high or float, DIx=0: low.
292 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
293
294 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
295
296 For example if payload is: [[image:image-20220523175847-2.png]]
297
298 **The value for the interface is:  **
299
300 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
301
302 AVI2 channel voltage is 0x04AC/1000=1.196V
303
304 ACI1 channel current is 0x1310/1000=4.880mA
305
306 ACI2 channel current is 0x1300/1000=4.864mA
307
308 The last byte 0xAA= 10101010(B) means
309
310 * [1] RO1 relay channel is close and the RO1 LED is ON.
311 * [0] RO2 relay channel is open and RO2 LED is OFF;
312
313
314 **LT22222-L:**
315
316 * [1] DI2 channel is high input and DI2 LED is ON;
317 * [0] DI1 channel is low input;
318
319 * [0] DO3 channel output state
320 ** DO3 is float in case no load between DO3 and V+.;
321 ** DO3 is high in case there is load between DO3 and V+.
322 ** DO3 LED is off in both case
323 * [1] DO2 channel output is low and DO2 LED is ON.
324 * [0] DO1 channel output state
325 ** DO1 is float in case no load between DO1 and V+.;
326 ** DO1 is high in case there is load between DO1 and V+.
327 ** DO1 LED is off in both case
328
329
330 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
331
332
333 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
334
335 (((
336 Total : 11 bytes payload
337 )))
338
339 [[image:image-20220523180452-3.png]]
340
341
342 (((
343 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
344 )))
345
346 [[image:image-20220523180506-4.png]]
347
348 * RO is for relay. ROx=1 : close，ROx=0 always open.
349 * FIRST: Indicate this is the first packet after join network.
350 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
351
352 (((
353 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
354 )))
355
356 (((
357
358
359 **To use counting mode, please run:**
360 )))
361
362 (% class="box infomessage" %)
363 (((
364 (((
365 **AT+MOD=2**
366 )))
367 )))
368
369 (% class="box infomessage" %)
370 (((
371 (((
372 **ATZ**
373 )))
374 )))
375
376 (((
377
378
379 (% style="color:#4f81bd" %)**AT Commands for counting:**
380 )))
381
382 (((
383 **For LT22222-L:**
384 )))
385
386 (% class="box infomessage" %)
387 (((
388 (((
389 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
390 )))
391 )))
392
393 (% class="box infomessage" %)
394 (((
395 (((
396 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
397 )))
398 )))
399
400 (% class="box infomessage" %)
401 (((
402 (((
403 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
404 )))
405 )))
406
407 (% class="box infomessage" %)
408 (((
409 (((
410 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
411 )))
412 )))
413
414 (% class="box infomessage" %)
415 (((
416 (((
417 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
418 )))
419 )))
420
421 (% class="box infomessage" %)
422 (((
423 (((
424 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
425 )))
426 )))
427
428
429
430 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
431
432 **LT22222-L**: This mode the DI1 is used as a counting pin.
433
434 [[image:image-20220523181246-5.png]]
435
436 (((
437 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
438 )))
439
440 [[image:image-20220523181301-6.png]]
441
442 * RO is for relay. ROx=1 : close，ROx=0 always open.
443 * FIRST: Indicate this is the first packet after join network.
444 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
445
446 (((
447 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
448 )))
449
450 (((
451 **To use counting mode, please run:**
452 )))
453
454 (% class="box infomessage" %)
455 (((
456 (((
457 **AT+MOD=3**
458 )))
459 )))
460
461 (% class="box infomessage" %)
462 (((
463 (((
464 **ATZ**
465 )))
466 )))
467
468 (((
469 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
470
471
472 )))
473
474
475 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
476
477
478 **LT22222-L**: This mode the DI1 is used as a counting pin.
479
480 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.
481
482 [[image:image-20220523181903-8.png]]
483
484
485 (((
486 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
487 )))
488
489 [[image:image-20220523181727-7.png]]
490
491 * RO is for relay. ROx=1 : close，ROx=0 always open.
492 * FIRST: Indicate this is the first packet after join network.
493 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
494
495 (((
496 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
497 )))
498
499 (((
500
501
502 **To use this mode, please run:**
503 )))
504
505 (% class="box infomessage" %)
506 (((
507 (((
508 **AT+MOD=4**
509 )))
510 )))
511
512 (% class="box infomessage" %)
513 (((
514 (((
515 **ATZ**
516 )))
517 )))
518
519 (((
520
521 )))
522
523 (((
524 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
525 )))
526
527 (((
528
529
530 **Plus below command for AVI1 Counting:**
531 )))
532
533 (% class="box infomessage" %)
534 (((
535 (((
536 **AT+SETCNT=3,60   (set AVI Count to 60)**
537 )))
538 )))
539
540 (% class="box infomessage" %)
541 (((
542 (((
543 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
544 )))
545 )))
546
547 (% class="box infomessage" %)
548 (((
549 (((
550 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
551 )))
552 )))
553
554 (% class="box infomessage" %)
555 (((
556 (((
557 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
558 )))
559 )))
560
561
562
563 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
564
565
566 **LT22222-L**: This mode the DI1 is used as a counting pin.
567
568 [[image:image-20220523182334-9.png]]
569
570 (((
571
572
573 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
574 )))
575
576 * RO is for relay. ROx=1 : close，ROx=0 always open.
577 * FIRST: Indicate this is the first packet after join network.
578 * (((
579 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
580 )))
581
582 (((
583 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
584 )))
585
586 (((
587
588
589 **To use this mode, please run:**
590 )))
591
592 (% class="box infomessage" %)
593 (((
594 (((
595 **AT+MOD=5**
596 )))
597 )))
598
599 (% class="box infomessage" %)
600 (((
601 (((
602 **ATZ**
603 )))
604 )))
605
606 (((
607 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
608 )))
609
610
611
612 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
613
614
615 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
616
617 For example, if user has configured below commands:
618
619 * **AT+MOD=1 ** **~-~->** The normal working mode
620 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
621
622 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
623
624 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
625 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.**
626
627 **AT Command to set Trigger Condition**:
628
629 (% style="color:#4f81bd" %)**Trigger base on voltage**:
630
631 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
632
633 **Example:**
634
635 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)
636
637 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
638
639
640 (% style="color:#4f81bd" %)**Trigger base on current**:
641
642 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
643
644 **Example:**
645
646 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
647
648
649 (% style="color:#4f81bd" %)**Trigger base on DI status**:
650
651 DI status trigger Flag.
652
653 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
654
655 **Example:**
656
657 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
658
659
660 **Downlink Command to set Trigger Condition**
661
662 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
663
664 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
665
666 AA: Code for this downlink Command:
667
668 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
669
670 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
671
672 yy2 yy2: AC1 or AV1 high limit.
673
674 yy3 yy3: AC2 or AV2 low limit.
675
676 Yy4 yy4: AC2 or AV2 high limit.
677
678
679 **Example1**: AA 00 13 88 00 00 00 00 00 00
680
681 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
682
683
684 **Example2**: AA 02 01 00
685
686 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
687
688
689 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
690
691 MOD6 Payload : total 11 bytes payload
692
693 [[image:image-20220524085923-1.png]]
694
695
696 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
697
698 [[image:image-20220524090106-2.png]]
699
700 * Each bits shows if the corresponding trigger has been configured.
701
702 **Example:**
703
704 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
705
706
707 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
708
709 [[image:image-20220524090249-3.png]]
710
711 * Each bits shows which status has been trigger on this uplink.
712
713 **Example:**
714
715 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
716
717
718 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
719
720 [[image:image-20220524090456-4.png]]
721
722 * Each bits shows which status has been trigger on this uplink.
723
724 **Example:**
725
726 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
727
728 00000101: Means both DI1 and DI2 trigger are enabled.
729
730
731 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
732
733 Downlink command to poll MOD6 status:
734
735 **AB 06**
736
737 When device got this command, it will send the MOD6 payload.
738
739
740
741 === 3.3.7 Payload Decoder ===
742
743 (((
744
745
746 **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/]]
747
748
749 )))
750
751
752
753 == 3.4 ​Configure LT via AT or Downlink ==
754
755 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
756
757 (((
758 There are two kinds of Commands:
759 )))
760
761 * (% 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]]
762
763 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
764
765
766 === 3.4.1 Common Commands ===
767
768 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]]
769
770
771
772 === 3.4.2 Sensor related commands ===
773
774 ==== 3.4.2.1 Set Transmit Interval ====
775
776 Set device uplink interval.
777
778 * AT Command:
779
780 (% class="box infomessage" %)
781 (((
782 **AT+TDC=N **
783 )))
784
785 **Example: **AT+TDC=30000. Means set interval to 30 seconds
786
787
788 * Downlink Payload (prefix 0x01):
789
790 (% class="box infomessage" %)
791 (((
792 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
793 )))
794
795
796
797 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
798
799 Set work mode.
800
801 * AT Command:
802
803 (% class="box infomessage" %)
804 (((
805 **AT+MOD=N  **
806 )))
807
808 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
809
810
811 * Downlink Payload (prefix 0x0A):
812
813 (% class="box infomessage" %)
814 (((
815 **0x0A aa     ~/~/ Same as AT+MOD=aa**
816 )))
817
818
819
820 ==== 3.4.2.3 Poll an uplink ====
821
822 * AT Command:
823
824 There is no AT Command to poll uplink
825
826
827 * Downlink Payload (prefix 0x08):
828
829 (% class="box infomessage" %)
830 (((
831 **0x08 FF     ~/~/ Poll an uplink,**
832 )))
833
834 **Example**: 0x08FF, ask device to send an Uplink
835
836
837
838 ==== 3.4.2.4 Enable Trigger Mode ====
839
840 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
841
842 * AT Command:
843
844 (% class="box infomessage" %)
845 (((
846 **AT+ADDMOD6=1 or 0**
847 )))
848
849 1: Enable Trigger Mode
850
851 0: Disable Trigger Mode
852
853
854 * Downlink Payload (prefix 0x0A 06):
855
856 (% class="box infomessage" %)
857 (((
858 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
859 )))
860
861
862
863 ==== 3.4.2.5 Poll trigger settings ====
864
865 Poll trigger settings,
866
867 * AT Command:
868
869 There is no AT Command for this feature.
870
871
872 * Downlink Payload (prefix 0x AB 06):
873
874 (% class="box infomessage" %)
875 (((
876 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
877 )))
878
879
880
881 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
882
883 Enable Disable DI1/DI2/DI2 as trigger,
884
885 * AT Command:
886
887 (% class="box infomessage" %)
888 (((
889 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
890 )))
891
892
893 **Example:**
894
895 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
896
897 * Downlink Payload (prefix 0xAA 02):
898
899 (% class="box infomessage" %)
900 (((
901 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
902 )))
903
904
905
906 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
907
908 Set DI1 or DI3(for LT-33222-L) trigger.
909
910 * AT Command:
911
912 (% class="box infomessage" %)
913 (((
914 **AT+TRIG1=a,b**
915 )))
916
917 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
918
919 b : delay timing.
920
921
922 **Example:**
923
924 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
925
926
927 * Downlink Payload (prefix 0x09 01 ):
928
929 (% class="box infomessage" %)
930 (((
931 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
932 )))
933
934
935
936 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
937
938 Set DI2 trigger.
939
940 * AT Command:
941
942 (% class="box infomessage" %)
943 (((
944 **AT+TRIG2=a,b**
945 )))
946
947 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
948
949 b : delay timing.
950
951
952 **Example:**
953
954 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
955
956
957 * Downlink Payload (prefix 0x09 02 ):
958
959 (% class="box infomessage" %)
960 (((
961 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
962 )))
963
964
965
966 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
967
968 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
969
970 * AT Command:
971
972 (% class="box infomessage" %)
973 (((
974 **AT+ACLIM. **
975 )))
976
977
978 * Downlink Payload (prefix 0xAA 01 ):
979
980 (% class="box infomessage" %)
981 (((
982 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
983 )))
984
985
986
987 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
988
989 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
990
991 * AT Command:
992
993 (% class="box infomessage" %)
994 (((
995 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
996 )))
997
998
999 * Downlink Payload (prefix 0xAA 00 ):
1000
1001 (% class="box infomessage" %)
1002 (((
1003 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
1004 )))
1005
1006
1007
1008 ==== 3.4.2.11 Trigger – Set minimum interval ====
1009
1010 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
1011
1012 * AT Command:
1013
1014 (% class="box infomessage" %)
1015 (((
1016 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
1017 )))
1018
1019
1020 * Downlink Payload (prefix 0xAC ):
1021
1022 (% class="box infomessage" %)
1023 (((
1024 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
1025 )))
1026
1027
1028
1029 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1030
1031 * AT Command:
1032
1033 There is no AT Command to control Digital Output
1034
1035
1036 * Downlink Payload (prefix 0x02):
1037
1038 (% class="box infomessage" %)
1039 (((
1040 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1041 )))
1042
1043 (((
1044 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1045 )))
1046
1047 (((
1048 01: Low,  00: High ,  11: No action
1049 )))
1050
1051 [[image:image-20220524092754-5.png]]
1052
1053 (((
1054 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1055 )))
1056
1057 (((
1058 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1059 )))
1060
1061
1062
1063 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1064
1065 * AT Command:
1066
1067 There is no AT Command to control Digital Output
1068
1069
1070 * Downlink Payload (prefix 0xA9):
1071
1072 (% class="box infomessage" %)
1073 (((
1074 (((
1075 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1076 )))
1077 )))
1078
1079 This is to control the digital output time of DO pin. Include four bytes:
1080
1081 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1082
1083 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1084
1085 01: DO pins will change back to original state after timeout.
1086
1087 00: DO pins will change to an inverter state after timeout 
1088
1089
1090 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1091
1092 [[image:image-20220524093238-6.png]]
1093
1094
1095 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1096
1097 [[image:image-20220524093328-7.png]]
1098
1099
1100 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1101
1102 [[image:image-20220524093351-8.png]]
1103
1104
1105 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1106
1107 Latching time. Unit: ms
1108
1109 Device will upload a packet if downlink code executes successfully.
1110
1111
1112 **Example payload:**
1113
1114 **~1. A9 01 01 01 01 07 D0**
1115
1116 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1117
1118 **2. A9 01 00 01 11 07 D0**
1119
1120 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1121
1122 **3. A9 00 00 00 00 07 D0**
1123
1124 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1125
1126 **4. A9 00 11 01 00 07 D0**
1127
1128 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
1129
1130
1131
1132 ==== 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ====
1133
1134 * AT Command:
1135
1136 There is no AT Command to control Relay Output
1137
1138
1139 * Downlink Payload (prefix 0x03):
1140
1141 (% class="box infomessage" %)
1142 (((
1143 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1144 )))
1145
1146 (((
1147 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1148 )))
1149
1150 (((
1151 01: Close ,  00: Open , 11: No action
1152 )))
1153
1154 (((
1155 [[image:image-20220524093724-9.png]]
1156 )))
1157
1158 Device will upload a packet if downlink code executes successfully.
1159
1160
1161
1162 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1163
1164 * AT Command:
1165
1166 There is no AT Command to control Relay Output
1167
1168
1169 * Downlink Payload (prefix 0x05):
1170
1171 (% class="box infomessage" %)
1172 (((
1173 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1174 )))
1175
1176 This is to control the relay output time of relay. Include four bytes:
1177
1178 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1179
1180 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1181
1182 01: Relays will change back to original state after timeout.
1183
1184 00: Relays will change to an inverter state after timeout
1185
1186
1187 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1188
1189 [[image:image-20220524093831-10.png]]
1190
1191
1192 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1193
1194 Device will upload a packet if downlink code executes successfully.
1195
1196
1197 **Example payload:**
1198
1199 **~1. 05 01 11 07 D0**
1200
1201 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1202
1203 **2. 05 01 10 07 D0**
1204
1205 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1206
1207 **3. 05 00 01 07 D0**
1208
1209 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1210
1211 **4. 05 00 00 07 D0**
1212
1213 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1214
1215
1216
1217 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1218
1219 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1220
1221 * AT Command:
1222
1223 (% class="box infomessage" %)
1224 (((
1225 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1226 )))
1227
1228
1229 * Downlink Payload (prefix 0xA5):
1230
1231 (% class="box infomessage" %)
1232 (((
1233 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1234 )))
1235
1236
1237
1238 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1239
1240 * AT Command:
1241
1242 (% class="box infomessage" %)
1243 (((
1244 **AT+SETCNT=aa,(bb cc dd ee) **
1245 )))
1246
1247 aa: 1: Set count1,
1248
1249 2: Set count2,
1250
1251 3: Set AV1 count
1252
1253 Bb cc dd ee: number to be set
1254
1255
1256 * Downlink Payload (prefix 0xA8):
1257
1258 (% class="box infomessage" %)
1259 (((
1260 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1261 )))
1262
1263
1264
1265 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1266
1267 Clear counting for counting mode
1268
1269 * AT Command:
1270
1271 (% class="box infomessage" %)
1272 (((
1273 **AT+CLRCOUNT ~/~/ clear all counting**
1274 )))
1275
1276 * Downlink Payload (prefix 0xA6):
1277
1278 (% class="box infomessage" %)
1279 (((
1280 **0x A6 01     ~/~/ clear all counting,**
1281 )))
1282
1283
1284
1285 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1286
1287 * AT Command:
1288
1289 (% class="box infomessage" %)
1290 (((
1291 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1292 )))
1293
1294 * Downlink Payload (prefix 0xA7):
1295
1296 (% class="box infomessage" %)
1297 (((
1298 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1299 )))
1300
1301 (((
1302 range: aa bb cc:0 to 16777215,  (unit:second)
1303
1304
1305 )))
1306
1307
1308 == 3.5 Integrate with Mydevice ==
1309
1310 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:
1311
1312 (((
1313 (% style="color:blue" %)**Step 1**(%%): Be sure that your device is programmed and properly connected to the network at this time.
1314 )))
1315
1316 (((
1317 (% style="color:blue" %)**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:
1318 )))
1319
1320 [[image:1653356737703-362.png||height="232" width="732"]]
1321
1322 [[image:image-20220524094641-11.png||height="390" width="723"]]
1323
1324
1325 [[image:image-20220524094641-12.png||height="402" width="718"]]
1326
1327
1328 (% style="color:blue" %)**Step 3**(%%): Create an account or log in Mydevices.
1329
1330 (% style="color:blue" %)**Step 4**(%%): Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1331
1332 Search under The things network
1333
1334 [[image:1653356838789-523.png||height="337" width="740"]]
1335
1336
1337
1338 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1339
1340 [[image:image-20220524094909-1.png||height="335" width="729"]]
1341
1342
1343 [[image:image-20220524094909-2.png||height="337" width="729"]]
1344
1345
1346 [[image:image-20220524094909-3.png||height="338" width="727"]]
1347
1348
1349 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1350
1351
1352 [[image:image-20220524094909-5.png||height="341" width="734"]]
1353
1354
1355
1356 == 3.6 Interface Detail ==
1357
1358 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1359
1360 Support NPN Type sensor
1361
1362 [[image:1653356991268-289.png]]
1363
1364
1365
1366 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1367
1368 (((
1369 The DI port of LT-22222-L can support NPN or PNP output sensor.
1370 )))
1371
1372 (((
1373 (((
1374 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
1375 )))
1376 )))
1377
1378 [[image:1653357170703-587.png]]
1379
1380 (((
1381 (((
1382 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1383 )))
1384 )))
1385
1386 (((
1387
1388 )))
1389
1390 (((
1391 (% style="color:blue" %)**Example1**(%%): Connect to a Low active sensor.
1392 )))
1393
1394 (((
1395 This type of sensor will output a low signal GND when active.
1396 )))
1397
1398 * (((
1399 Connect sensor’s output to DI1-
1400 )))
1401 * (((
1402 Connect sensor’s VCC to DI1+.
1403 )))
1404
1405 (((
1406 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1407 )))
1408
1409 (((
1410 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1411 )))
1412
1413 (((
1414 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.
1415 )))
1416
1417 (((
1418
1419 )))
1420
1421 (((
1422 (% style="color:blue" %)**Example2**(%%): Connect to a High active sensor.
1423 )))
1424
1425 (((
1426 This type of sensor will output a high signal (example 24v) when active.
1427 )))
1428
1429 * (((
1430 Connect sensor’s output to DI1+
1431 )))
1432 * (((
1433 Connect sensor’s GND DI1-.
1434 )))
1435
1436 (((
1437 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1438 )))
1439
1440 (((
1441 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1442 )))
1443
1444 (((
1445 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.
1446 )))
1447
1448 (((
1449
1450 )))
1451
1452 (((
1453 (% style="color:blue" %)**Example3**(%%): Connect to a 220v high active sensor.
1454 )))
1455
1456 (((
1457 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1458 )))
1459
1460 * (((
1461 Connect sensor’s output to DI1+ with a serial 50K resistor
1462 )))
1463 * (((
1464 Connect sensor’s GND DI1-.
1465 )))
1466
1467 (((
1468 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1469 )))
1470
1471 (((
1472 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1473 )))
1474
1475 (((
1476 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.
1477 )))
1478
1479
1480
1481 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1482
1483 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1484
1485 [[image:1653357531600-905.png]]
1486
1487
1488
1489 === 3.6.4 Analog Input Interface ===
1490
1491 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:
1492
1493
1494 (% style="color:blue" %)**AC2 = (IN2 voltage )/12**
1495
1496 [[image:1653357592296-182.png]]
1497
1498 Example to connect a 4~~20mA sensor
1499
1500 We take the wind speed sensor as an example for reference only.
1501
1502
1503 **Specifications of the wind speed sensor:**
1504
1505 Red:  12~~24v
1506
1507 Yellow:  4~~20mA
1508
1509 Black:  GND
1510
1511
1512 **Connection diagram:**
1513
1514 [[image:1653357640609-758.png]]
1515
1516 [[image:1653357648330-671.png||height="155" width="733"]]
1517
1518
1519
1520 === 3.6.5 Relay Output ===
1521
1522 (((
1523 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:
1524 )))
1525
1526 [[image:image-20220524100215-9.png]]
1527
1528 [[image:image-20220524100215-10.png||height="382" width="723"]]
1529
1530
1531
1532 == 3.7 LEDs Indicators ==
1533
1534 [[image:image-20220524100748-11.png]]
1535
1536
1537 = 4. Use AT Command =
1538
1539 == 4.1 Access AT Command ==
1540
1541 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.
1542
1543 [[image:1653358238933-385.png]]
1544
1545
1546 (((
1547 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:
1548 )))
1549
1550 [[image:1653358355238-883.png]]
1551
1552
1553 (((
1554 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/]]
1555 )))
1556
1557 (((
1558 AT+<CMD>?        : Help on <CMD>
1559 )))
1560
1561 (((
1562 AT+<CMD>         : Run <CMD>
1563 )))
1564
1565 (((
1566 AT+<CMD>=<value> : Set the value
1567 )))
1568
1569 (((
1570 AT+<CMD>=?       : Get the value
1571 )))
1572
1573 (((
1574 ATZ: Trig a reset of the MCU
1575 )))
1576
1577 (((
1578 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1579 )))
1580
1581 (((
1582 AT+DEUI: Get or Set the Device EUI
1583 )))
1584
1585 (((
1586 AT+DADDR: Get or Set the Device Address
1587 )))
1588
1589 (((
1590 AT+APPKEY: Get or Set the Application Key
1591 )))
1592
1593 (((
1594 AT+NWKSKEY: Get or Set the Network Session Key
1595 )))
1596
1597 (((
1598 AT+APPSKEY: Get or Set the Application Session Key
1599 )))
1600
1601 (((
1602 AT+APPEUI: Get or Set the Application EUI
1603 )))
1604
1605 (((
1606 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1607 )))
1608
1609 (((
1610 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1611 )))
1612
1613 (((
1614 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1615 )))
1616
1617 (((
1618 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1619 )))
1620
1621 (((
1622 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1623 )))
1624
1625 (((
1626 AT+RX2FQ: Get or Set the Rx2 window frequency
1627 )))
1628
1629 (((
1630 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1631 )))
1632
1633 (((
1634 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1635 )))
1636
1637 (((
1638 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1639 )))
1640
1641 (((
1642 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1643 )))
1644
1645 (((
1646 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1647 )))
1648
1649 (((
1650 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1651 )))
1652
1653 (((
1654 AT+NWKID: Get or Set the Network ID
1655 )))
1656
1657 (((
1658 AT+FCU: Get or Set the Frame Counter Uplink
1659 )))
1660
1661 (((
1662 AT+FCD: Get or Set the Frame Counter Downlink
1663 )))
1664
1665 (((
1666 AT+CLASS: Get or Set the Device Class
1667 )))
1668
1669 (((
1670 AT+JOIN: Join network
1671 )))
1672
1673 (((
1674 AT+NJS: Get OTAA Join Status
1675 )))
1676
1677 (((
1678 AT+SENDB: Send hexadecimal data along with the application port
1679 )))
1680
1681 (((
1682 AT+SEND: Send text data along with the application port
1683 )))
1684
1685 (((
1686 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1687 )))
1688
1689 (((
1690 AT+RECV: Print last received data in raw format
1691 )))
1692
1693 (((
1694 AT+VER: Get current image version and Frequency Band
1695 )))
1696
1697 (((
1698 AT+CFM: Get or Set the confirmation mode (0-1)
1699 )))
1700
1701 (((
1702 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1703 )))
1704
1705 (((
1706 AT+SNR: Get the SNR of the last received packet
1707 )))
1708
1709 (((
1710 AT+RSSI: Get the RSSI of the last received packet
1711 )))
1712
1713 (((
1714 AT+TDC: Get or set the application data transmission interval in ms
1715 )))
1716
1717 (((
1718 AT+PORT: Get or set the application port
1719 )))
1720
1721 (((
1722 AT+DISAT: Disable AT commands
1723 )))
1724
1725 (((
1726 AT+PWORD: Set password, max 9 digits
1727 )))
1728
1729 (((
1730 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1731 )))
1732
1733 (((
1734 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1735 )))
1736
1737 (((
1738 AT+CFG: Print all settings
1739
1740
1741 )))
1742
1743
1744
1745 == 4.2 Common AT Command Sequence ==
1746
1747 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1748
1749 (((
1750
1751
1752 **If device has not joined network yet:**
1753 )))
1754
1755 (((
1756 (% style="background-color:#dcdcdc" %)123456
1757 )))
1758
1759 (((
1760 (% style="background-color:#dcdcdc" %)AT+FDR
1761 )))
1762
1763 (((
1764 (% style="background-color:#dcdcdc" %)123456
1765 )))
1766
1767 (((
1768 (% style="background-color:#dcdcdc" %)AT+NJM=0
1769 )))
1770
1771 (((
1772 (% style="background-color:#dcdcdc" %)ATZ
1773 )))
1774
1775
1776 (((
1777 **If device already joined network:**
1778 )))
1779
1780 (((
1781 (% style="background-color:#dcdcdc" %)AT+NJM=0
1782 )))
1783
1784 (((
1785 (% style="background-color:#dcdcdc" %)ATZ
1786
1787
1788 )))
1789
1790
1791
1792 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1793
1794 (((
1795
1796
1797 (% style="background-color:#dcdcdc" %)123456(%%)  Enter Password to have AT access.
1798 )))
1799
1800 (((
1801 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1802 )))
1803
1804 (((
1805 (% style="background-color:#dcdcdc" %) 123456(%%)  Enter Password to have AT access.
1806 )))
1807
1808 (((
1809 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1810 )))
1811
1812 (((
1813 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%)  Set to ABP mode
1814 )))
1815
1816 (((
1817 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%)  Set the Adaptive Data Rate Off
1818 )))
1819
1820 (((
1821 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1822 )))
1823
1824 (((
1825 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1826 )))
1827
1828 (((
1829 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1830 )))
1831
1832 (((
1833 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%)  Set RX2Frequency to 868.4Mhz (according to the result from server)
1834 )))
1835
1836 (((
1837 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1838 )))
1839
1840 (((
1841 (% 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.
1842 )))
1843
1844 (((
1845 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1846
1847
1848 )))
1849
1850 (((
1851 (% style="color:red" %)**Note:**
1852 )))
1853
1854 (((
1855 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1856 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1857 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.
1858 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
1859 )))
1860
1861 (((
1862 [[image:1653359097980-169.png||height="188" width="729"]]
1863 )))
1864
1865 (((
1866
1867 )))
1868
1869
1870 === 4.2.3 Change to Class A ===
1871
1872 If sensor JOINED
1873 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1874 ATZ
1875
1876
1877 = 5. FAQ =
1878
1879 == 5.1 How to upgrade the image? ==
1880
1881
1882 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1883
1884 * Support new features
1885 * For bug fix
1886 * Change LoRaWAN bands.
1887
1888 Below shows the hardware connection for how to upload an image to the LT:
1889
1890 [[image:1653359603330-121.png]]
1891
1892
1893 (((
1894 (% style="color:blue" %)**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]].
1895 (% style="color:blue" %)**Step2**(%%)**:** Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1896 (% style="color:blue" %)**Step3**(%%)**:** Open flashloader; choose the correct COM port to update.
1897
1898
1899 (% style="color:blue" %)**For LT-22222-L**(%%):
1900 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.
1901 )))
1902
1903 [[image:image-20220524103407-12.png]]
1904
1905 [[image:image-20220524103429-13.png]]
1906
1907 [[image:image-20220524104033-15.png]]
1908
1909
1910 (% 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:
1911
1912 [[image:1653360054704-518.png||height="186" width="745"]]
1913
1914
1915 (((
1916 (((
1917
1918
1919 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1920 )))
1921 )))
1922
1923 (((
1924 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1925 )))
1926
1927 (((
1928
1929
1930 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1931 )))
1932
1933 (((
1934 (((
1935 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1936 )))
1937 )))
1938
1939 (((
1940 (((
1941 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1942
1943
1944 )))
1945 )))
1946
1947 (((
1948 (% 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.
1949 )))
1950
1951 (((
1952 [[image:1653360231087-571.png||height="401" width="727"]]
1953 )))
1954
1955 (((
1956 (% 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.
1957 )))
1958
1959
1960 (((
1961 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1962 )))
1963
1964 (((
1965 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1966 (% style="background-color:#dcdcdc" %)AT+FDR(%%)  Reset Parameters to Factory Default, Keys Reserve
1967 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1968 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%) Set to ABP mode
1969 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%) Set the Adaptive Data Rate Off
1970 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1971 (% style="background-color:#dcdcdc" %)AT+TDC=60000 (%%) Set transmit interval to 60 seconds
1972 (% style="background-color:#dcdcdc" %)AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1973 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%)  Set Device Address to 26 01 1A F1
1974 (% style="background-color:#dcdcdc" %)ATZ        (%%) Reset MCU
1975 )))
1976
1977
1978 (((
1979 As shown in below:
1980 )))
1981
1982 [[image:1653360498588-932.png||height="485" width="726"]]
1983
1984
1985 == 5.4 Can I see counting event in Serial? ==
1986
1987 (((
1988 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.
1989
1990
1991 == 5.5 Can i use point to point communication for LT-22222-L? ==
1992
1993 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1994 )))
1995
1996 (((
1997
1998
1999 = 6. Trouble Shooting =
2000 )))
2001
2002 (((
2003 (((
2004 == 6.1 Downlink doesn’t work, how to solve it? ==
2005 )))
2006 )))
2007
2008 (((
2009 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
2010 )))
2011
2012 (((
2013
2014
2015 == 6.2 Have trouble to upload image. ==
2016 )))
2017
2018 (((
2019 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
2020 )))
2021
2022 (((
2023
2024
2025 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
2026 )))
2027
2028 (((
2029 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
2030 )))
2031
2032
2033
2034 = 7. Order Info =
2035
2036
2037 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
2038
2039
2040 (% style="color:#4f81bd" %)**XXX:**
2041
2042 * (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
2043 * (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
2044 * (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
2045 * (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
2046 * (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
2047 * (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
2048 * (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2049 * (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2050 * (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2051
2052 = 8. Packing Info =
2053
2054
2055 **Package Includes**:
2056
2057 * LT-22222-L I/O Controller x 1
2058 * Stick Antenna for LoRa RF part x 1
2059 * Bracket for controller x1
2060 * Program cable x 1
2061
2062 **Dimension and weight**:
2063
2064 * Device Size: 13.5 x 7 x 3 cm
2065 * Device Weight: 105g
2066 * Package Size / pcs : 14.5 x 8 x 5 cm
2067 * Weight / pcs : 170g
2068
2069 = 9. Support =
2070
2071 * (((
2072 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.
2073 )))
2074 * (((
2075 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 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2076 )))
2077
2078 = 10. Reference​​​​​ =
2079
2080 * 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]]
2081 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2082 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2083 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]