Version 77.6 by Xiaoling on 2022/06/10 08:38

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