Skip to Content
Version 82.41 by Xiaoling on 2022/06/25 15:18
Show last authors
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
23
24 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.
25 )))
26
27 (((
28 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.
29 )))
30
31 (((
32 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
33 )))
34
35 (((
36 The use environment includes:
37 )))
38
39 (((
40 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.
41 )))
42
43 (((
44 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
45 )))
46
47 (((
48 [[image:1653295757274-912.png]]
49
50
51 )))
52
53
54 == 1.2  Specifications ==
55
56 (((
57
58
59 **Hardware System:**
60 )))
61
62 * (((
63 STM32L072CZT6 MCU
64 )))
65 * (((
66 SX1276/78 Wireless Chip 
67 )))
68 * (((
69 (((
70 Power Consumption:
71 )))
72
73 * (((
74 Idle: 4mA@12v
75 )))
76 * (((
77 20dB Transmit: 34mA@12v
78 )))
79 )))
80
81 (((
82
83
84 **Interface for Model: LT22222-L:**
85 )))
86
87 * (((
88 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
89 )))
90 * (((
91 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
92 )))
93 * (((
94 2 x Relay Output (5A@250VAC / 30VDC)
95 )))
96 * (((
97 2 x 0~~20mA Analog Input (res:0.01mA)
98 )))
99 * (((
100 2 x 0~~30V Analog Input (res:0.01v)
101 )))
102 * (((
103 Power Input 7~~ 24V DC. 
104 )))
105
106 (((
107
108
109 **LoRa Spec:**
110 )))
111
112 * (((
113 (((
114 Frequency Range:
115 )))
116
117 * (((
118 Band 1 (HF): 862 ~~ 1020 Mhz
119 )))
120 * (((
121 Band 2 (LF): 410 ~~ 528 Mhz
122 )))
123 )))
124 * (((
125 168 dB maximum link budget.
126 )))
127 * (((
128 +20 dBm - 100 mW constant RF output vs.
129 )))
130 * (((
131 +14 dBm high efficiency PA.
132 )))
133 * (((
134 Programmable bit rate up to 300 kbps.
135 )))
136 * (((
137 High sensitivity: down to -148 dBm.
138 )))
139 * (((
140 Bullet-proof front end: IIP3 = -12.5 dBm.
141 )))
142 * (((
143 Excellent blocking immunity.
144 )))
145 * (((
146 Low RX current of 10.3 mA, 200 nA register retention.
147 )))
148 * (((
149 Fully integrated synthesizer with a resolution of 61 Hz.
150 )))
151 * (((
152 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
153 )))
154 * (((
155 Built-in bit synchronizer for clock recovery.
156 )))
157 * (((
158 Preamble detection.
159 )))
160 * (((
161 127 dB Dynamic Range RSSI.
162 )))
163 * (((
164 Automatic RF Sense and CAD with ultra-fast AFC.
165 )))
166 * (((
167 Packet engine up to 256 bytes with CRC.
168
169
170
171
172 )))
173
174 == 1.3 Features ==
175
176 * LoRaWAN Class A & Class C protocol
177 * Optional Customized LoRa Protocol
178 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
179 * AT Commands to change parameters
180 * Remote configure parameters via LoRa Downlink
181 * Firmware upgradable via program port
182 * Counting
183
184
185
186
187
188 == 1.4  Applications ==
189
190 * Smart Buildings & Home Automation
191 * Logistics and Supply Chain Management
192 * Smart Metering
193 * Smart Agriculture
194 * Smart Cities
195 * Smart Factory
196
197
198
199
200
201 == 1.5 Hardware Variants ==
202
203 (% border="1" style="background-color:#f7faff; width:500px" %)
204 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
205 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
206 * 2 x Digital Input (Bi-direction)
207 * 2 x Digital Output
208 * 2 x Relay Output (5A@250VAC / 30VDC)
209 * 2 x 0~~20mA Analog Input (res:0.01mA)
210 * 2 x 0~~30V Analog Input (res:0.01v)
211 * 1 x Counting Port
212 )))
213
214
215
216 = 2. Power ON Device =
217
218 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.
219
220 (((
221 PWR will on when device is properly powered.
222 )))
223
224 [[image:1653297104069-180.png]]
225
226
227
228 = 3. Operation Mode =
229
230 == 3.1 How it works? ==
231
232 (((
233 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. 
234 )))
235
236 (((
237 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.
238 )))
239
240
241 == 3.2 Example to join LoRaWAN network ==
242
243 (((
244 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. 
245 )))
246
247 [[image:image-20220523172350-1.png||height="266" width="864"]]
248
249
250 (((
251 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:
252 )))
253
254 (((
255 (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LT IO controller.
256 )))
257
258 (((
259 Each LT is shipped with a sticker with the default device EUI as below:
260 )))
261
262 [[image:1653297924498-393.png]]
263
264
265 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
266
267 Add APP EUI in the application.
268
269 [[image:1653297955910-247.png||height="321" width="716"]]
270
271
272 Add APP KEY and DEV EUI
273
274 [[image:1653298023685-319.png]]
275
276
277 (((
278 (% style="color:blue" %)**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.
279 )))
280
281 [[image:1653298044601-602.png||height="405" width="709"]]
282
283
284
285 == 3.3 Uplink Payload ==
286
287 There are five working modes + one interrupt mode on LT for different type application:
288
289 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
290 * **MOD2**: Double DI Counting + DO + RO
291 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
292 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
293 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
294 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
295
296
297
298
299
300
301 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
302
303 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
304
305 [[image:image-20220523174024-3.png]]
306
307 (((
308
309
310 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
311 )))
312
313 [[image:image-20220523174254-4.png]]
314
315 * RO is for relay. ROx=1 : close，ROx=0 always open.
316 * DI is for digital input. DIx=1: high or float, DIx=0: low.
317 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
318
319 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
320
321 For example if payload is: [[image:image-20220523175847-2.png]]
322
323
324 **The value for the interface is:  **
325
326 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
327
328 AVI2 channel voltage is 0x04AC/1000=1.196V
329
330 ACI1 channel current is 0x1310/1000=4.880mA
331
332 ACI2 channel current is 0x1300/1000=4.864mA
333
334 The last byte 0xAA= 10101010(B) means
335
336 * [1] RO1 relay channel is close and the RO1 LED is ON.
337 * [0] RO2 relay channel is open and RO2 LED is OFF;
338
339
340 **LT22222-L:**
341
342 * [1] DI2 channel is high input and DI2 LED is ON;
343 * [0] DI1 channel is low input;
344
345 * [0] DO3 channel output state
346 ** DO3 is float in case no load between DO3 and V+.;
347 ** DO3 is high in case there is load between DO3 and V+.
348 ** DO3 LED is off in both case
349 * [1] DO2 channel output is low and DO2 LED is ON.
350 * [0] DO1 channel output state
351 ** DO1 is float in case no load between DO1 and V+.;
352 ** DO1 is high in case there is load between DO1 and V+.
353 ** DO1 LED is off in both case
354
355
356
357
358
359
360 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
361
362
363 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
364
365 (((
366 Total : 11 bytes payload
367 )))
368
369 [[image:image-20220523180452-3.png]]
370
371
372 (((
373 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
374 )))
375
376 [[image:image-20220523180506-4.png]]
377
378 * RO is for relay. ROx=1 : close，ROx=0 always open.
379 * FIRST: Indicate this is the first packet after join network.
380 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
381
382 (((
383 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
384 )))
385
386 (((
387
388
389 **To use counting mode, please run:**
390 )))
391
392 (% class="box infomessage" %)
393 (((
394 (((
395 **AT+MOD=2**
396
397 **ATZ**
398 )))
399 )))
400
401 (((
402
403
404 (% style="color:#4f81bd" %)**AT Commands for counting:**
405 )))
406
407 (((
408 **For LT22222-L:**
409
410
411 (% style="color:blue" %)**AT+TRIG1=0,100**(%%)**  (set DI1 port to trigger on low level, valid signal is 100ms) **
412
413 (% style="color:blue" %)**AT+TRIG1=1,100**(%%)**  (set DI1 port to trigger on high level, valid signal is 100ms ) **
414
415 (% style="color:blue" %)**AT+TRIG2=0,100**(%%)**  (set DI2 port to trigger on low level, valid signal is 100ms) **
416
417 (% style="color:blue" %)**AT+TRIG2=1,100**(%%)**  (set DI2 port to trigger on high level, valid signal is 100ms ) **
418
419 (% style="color:blue" %)**AT+SETCNT=1,60**(%%)**   (Set COUNT1 value to 60)**
420
421 (% style="color:blue" %)**AT+SETCNT=2,60**(%%)**   (Set COUNT2 value to 60)**
422 )))
423
424
425
426 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
427
428 **LT22222-L**: This mode the DI1 is used as a counting pin.
429
430 [[image:image-20220523181246-5.png]]
431
432 (((
433 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
434 )))
435
436 [[image:image-20220523181301-6.png]]
437
438 * RO is for relay. ROx=1 : close，ROx=0 always open.
439 * FIRST: Indicate this is the first packet after join network.
440 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
441
442 (((
443 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
444 )))
445
446 (((
447 **To use counting mode, please run:**
448 )))
449
450 (% class="box infomessage" %)
451 (((
452 (((
453 **AT+MOD=3**
454
455 **ATZ**
456 )))
457 )))
458
459 (((
460 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
461 )))
462
463
464
465 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
466
467
468 **LT22222-L**: This mode the DI1 is used as a counting pin.
469
470 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.
471
472 [[image:image-20220523181903-8.png]]
473
474
475 (((
476 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
477 )))
478
479 [[image:image-20220523181727-7.png]]
480
481 * RO is for relay. ROx=1 : close，ROx=0 always open.
482 * FIRST: Indicate this is the first packet after join network.
483 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
484
485 (((
486 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
487 )))
488
489 (((
490
491
492 **To use this mode, please run:**
493 )))
494
495 (% class="box infomessage" %)
496 (((
497 (((
498 **AT+MOD=4**
499
500 **ATZ**
501 )))
502 )))
503
504
505
506 (((
507 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
508 )))
509
510 (((
511
512
513 **Plus below command for AVI1 Counting:**
514
515
516 (% style="color:blue" %)**AT+SETCNT=3,60**(%%)**  (set AVI Count to 60)**
517
518 (% style="color:blue" %)**AT+VOLMAX=20000**(%%)**  (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
519
520 (% style="color:blue" %)**AT+VOLMAX=20000,0**(%%)**  (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
521
522 (% style="color:blue" %)**AT+VOLMAX=20000,1**(%%)**  (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
523 )))
524
525
526
527 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
528
529
530 **LT22222-L**: This mode the DI1 is used as a counting pin.
531
532 [[image:image-20220523182334-9.png]]
533
534 (((
535
536
537 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
538 )))
539
540 * RO is for relay. ROx=1 : close，ROx=0 always open.
541 * FIRST: Indicate this is the first packet after join network.
542 * (((
543 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
544 )))
545
546 (((
547 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
548 )))
549
550 (((
551
552
553 **To use this mode, please run:**
554 )))
555
556 (% class="box infomessage" %)
557 (((
558 (((
559 **AT+MOD=5**
560
561 **ATZ**
562 )))
563 )))
564
565 (((
566 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
567 )))
568
569
570
571 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
572
573
574 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
575
576 For example, if user has configured below commands:
577
578 * **AT+MOD=1 ** **~-~->** The normal working mode
579 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
580
581 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
582
583 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
584 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.**
585
586 (% style="color:#037691" %)**AT Command to set Trigger Condition**:
587
588 (% style="color:#4f81bd" %)**Trigger base on voltage**:
589
590 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
591
592 **Example:**
593
594 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)
595
596 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
597
598
599
600 (% style="color:#4f81bd" %)**Trigger base on current**:
601
602 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
603
604 **Example:**
605
606 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
607
608
609
610 (% style="color:#4f81bd" %)**Trigger base on DI status**:
611
612 DI status trigger Flag.
613
614 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
615
616
617 **Example:**
618
619 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
620
621
622 (% style="color:#037691" %)**Downlink Command to set Trigger Condition:**
623
624 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
625
626 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
627
628 AA: Code for this downlink Command:
629
630 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
631
632 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
633
634 yy2 yy2: AC1 or AV1 high limit.
635
636 yy3 yy3: AC2 or AV2 low limit.
637
638 Yy4 yy4: AC2 or AV2 high limit.
639
640
641 **Example1**: AA 00 13 88 00 00 00 00 00 00
642
643 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
644
645
646 **Example2**: AA 02 01 00
647
648 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
649
650
651
652 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
653
654 MOD6 Payload : total 11 bytes payload
655
656 [[image:image-20220524085923-1.png]]
657
658
659 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
660
661 [[image:image-20220524090106-2.png]]
662
663 * Each bits shows if the corresponding trigger has been configured.
664
665 **Example:**
666
667 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
668
669
670 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
671
672 [[image:image-20220524090249-3.png]]
673
674 * Each bits shows which status has been trigger on this uplink.
675
676 **Example:**
677
678 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
679
680
681 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
682
683 [[image:image-20220524090456-4.png]]
684
685 * Each bits shows which status has been trigger on this uplink.
686
687 **Example:**
688
689 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
690
691 00000101: Means both DI1 and DI2 trigger are enabled.
692
693
694 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
695
696 Downlink command to poll MOD6 status:
697
698 **AB 06**
699
700 When device got this command, it will send the MOD6 payload.
701
702
703
704 === 3.3.7 Payload Decoder ===
705
706 (((
707
708
709 **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/]]
710
711
712 )))
713
714
715 == 3.4 ​Configure LT via AT or Downlink ==
716
717 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
718
719 (((
720 There are two kinds of Commands:
721 )))
722
723 * (% 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]]
724
725 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
726
727
728
729
730
731
732 === 3.4.1 Common Commands ===
733
734 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]]
735
736
737
738 === 3.4.2 Sensor related commands ===
739
740 ==== 3.4.2.1 Set Transmit Interval ====
741
742 Set device uplink interval.
743
744 * (% style="color:#037691" %)**AT Command:**
745
746 **AT+TDC=N **
747
748
749 **Example: **AT+TDC=30000. Means set interval to 30 seconds
750
751
752 * (% style="color:#037691" %)**Downlink Payload (prefix 0x01):**
753
754 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
755
756
757
758
759 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
760
761 Set work mode.
762
763 * (% style="color:#037691" %)**AT Command:**
764
765 **AT+MOD=N  **
766
767
768 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
769
770
771 * (% style="color:#037691" %)**Downlink Payload (prefix 0x0A):**
772
773 **0x0A aa    ** ~/~/ Same as AT+MOD=aa
774
775
776
777
778 ==== 3.4.2.3 Poll an uplink ====
779
780 * (% style="color:#037691" %)**AT Command:**
781
782 There is no AT Command to poll uplink
783
784
785 * (% style="color:#037691" %)**Downlink Payload (prefix 0x08):**
786
787 **0x08 FF     **~/~/ Poll an uplink
788
789 **Example**: 0x08FF, ask device to send an Uplink
790
791
792
793 ==== 3.4.2.4 Enable Trigger Mode ====
794
795 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
796
797 * (% style="color:#037691" %)**AT Command:**
798
799 **AT+ADDMOD6=1 or 0**
800
801 1: Enable Trigger Mode
802
803 0: Disable Trigger Mode
804
805
806 * (% style="color:#037691" %)**Downlink Payload (prefix 0x0A 06):**
807
808 **0x0A 06 aa    ** ~/~/ Same as AT+ADDMOD6=aa
809
810
811
812
813 ==== 3.4.2.5 Poll trigger settings ====
814
815 Poll trigger settings,
816
817 * (% style="color:#037691" %)**AT Command:**
818
819 There is no AT Command for this feature.
820
821
822 * (% style="color:#037691" %)**Downlink Payload (prefix 0x AB 06):**
823
824 **0xAB 06         **~/~/ Poll trigger settings, device will uplink trigger settings once receive this command
825
826
827
828
829 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
830
831 Enable Disable DI1/DI2/DI2 as trigger,
832
833 * (% style="color:#037691" %)**AT Command:**
834
835 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
836
837
838 **Example:**
839
840 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
841
842 * (% style="color:#037691" %)**Downlink Payload (prefix 0xAA 02):**
843
844 **0xAA 02 aa bb        **~/~/ Same as AT+DTRI=aa,bb
845
846
847
848
849 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
850
851 Set DI1 or DI3(for LT-33222-L) trigger.
852
853 * (% style="color:#037691" %)**AT Command:**
854
855 **AT+TRIG1=a,b**
856
857 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
858
859 b : delay timing.
860
861
862 **Example:**
863
864 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
865
866
867 * (% style="color:#037691" %)**Downlink Payload (prefix 0x09 01 ):**
868 * **0x09 01 aa bb cc    ** ~/~/ same as AT+TRIG1=aa,0x(bb cc)
869
870
871
872 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
873
874 Set DI2 trigger.
875
876 * (% style="color:#037691" %)**AT Command:**
877
878 **AT+TRIG2=a,b**
879
880
881 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
882
883 b : delay timing.
884
885
886 **Example:**
887
888 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
889
890
891 * (% style="color:#037691" %)**Downlink Payload (prefix 0x09 02 ):**
892
893 **0x09 02 aa bb cc           **~/~/ same as AT+TRIG1=aa,0x(bb cc)
894
895
896
897
898 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
899
900 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
901
902 * (% style="color:#037691" %)**AT Command**
903
904 **AT+ACLIM**
905
906
907 * (% style="color:#037691" %)**Downlink Payload (prefix 0xAA 01 )**
908
909 **0x AA 01 aa bb cc dd ee ff gg hh        ** ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
910
911
912
913
914 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
915
916 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
917
918 * (% style="color:#037691" %)**AT Command**
919
920 **AT+AVLIM  See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
921
922
923 * (% style="color:#037691" %)**Downlink Payload (prefix 0xAA 00 )**
924
925 **0x AA 00 aa bb cc dd ee ff gg hh    ** ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
926
927
928
929
930 ==== 3.4.2.11 Trigger – Set minimum interval ====
931
932 Set AV and AC trigger minimum interval, system won't response to the second trigger within this set time after the first trigger.
933
934 * (% style="color:#037691" %)**AT Command**
935
936 **AT+ATDC=5        ** Device won't response the second trigger within 5 minute after the first trigger.
937
938
939 * (% style="color:#037691" %)**Downlink Payload (prefix 0xAC )**
940
941 **0x AC aa bb   ** ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)
942
943
944
945
946 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
947
948 * (% style="color:#037691" %)**AT Command**
949
950 There is no AT Command to control Digital Output
951
952
953 * (% style="color:#037691" %)**Downlink Payload (prefix 0x02)**
954 * **0x02 aa bb cc     **~/~/ Set DO1/DO2/DO3 output
955
956 (((
957 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
958 )))
959
960 (((
961 01: Low,  00: High ,  11: No action
962 )))
963
964 [[image:image-20220524092754-5.png]]
965
966 (((
967 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
968 )))
969
970 (((
971 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
972 )))
973
974
975
976
977 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
978
979 * (% style="color:#037691" %)**AT Command**
980
981 There is no AT Command to control Digital Output
982
983
984 * (% style="color:#037691" %)**Downlink Payload (prefix 0xA9)**
985
986 **0xA9 aa bb cc     **~/~/ Set DO1/DO2/DO3 output with time control
987
988
989 This is to control the digital output time of DO pin. Include four bytes:
990
991 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
992
993 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
994
995 01: DO pins will change back to original state after timeout.
996
997 00: DO pins will change to an inverter state after timeout 
998
999
1000 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1001
1002 [[image:image-20220524093238-6.png]]
1003
1004
1005 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1006
1007 [[image:image-20220524093328-7.png]]
1008
1009
1010 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1011
1012 [[image:image-20220524093351-8.png]]
1013
1014
1015 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1016
1017 Latching time. Unit: ms
1018
1019 Device will upload a packet if downlink code executes successfully.
1020
1021
1022 **Example payload:**
1023
1024 **~1. A9 01 01 01 01 07 D0**
1025
1026 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1027
1028 **2. A9 01 00 01 11 07 D0**
1029
1030 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1031
1032 **3. A9 00 00 00 00 07 D0**
1033
1034 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1035
1036 **4. A9 00 11 01 00 07 D0**
1037
1038 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
1039
1040
1041
1042
1043 ==== 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ====
1044
1045 * (% style="color:#037691" %)**AT Command:**
1046
1047 There is no AT Command to control Relay Output
1048
1049
1050 * (% style="color:#037691" %)**Downlink Payload (prefix 0x03):**
1051
1052 **0x03 aa bb     **~/~/ Set RO1/RO2 output
1053
1054
1055 (((
1056 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1057 )))
1058
1059 (((
1060 01: Close ,  00: Open , 11: No action
1061 )))
1062
1063 (((
1064 [[image:image-20220524093724-9.png]]
1065 )))
1066
1067 Device will upload a packet if downlink code executes successfully.
1068
1069
1070
1071
1072 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1073
1074 * (% style="color:#037691" %)**AT Command:**
1075
1076 There is no AT Command to control Relay Output
1077
1078
1079 * (% style="color:#037691" %)**Downlink Payload (prefix 0x05):**
1080
1081 **0x05 aa bb cc dd     **~/~/ Set RO1/RO2 relay with time control
1082
1083
1084 This is to control the relay output time of relay. Include four bytes:
1085
1086 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1087
1088 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1089
1090 01: Relays will change back to original state after timeout.
1091
1092 00: Relays will change to an inverter state after timeout
1093
1094
1095 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1096
1097 [[image:image-20220524093831-10.png]]
1098
1099
1100 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1101
1102 Device will upload a packet if downlink code executes successfully.
1103
1104
1105 **Example payload:**
1106
1107 **~1. 05 01 11 07 D0**
1108
1109 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1110
1111 **2. 05 01 10 07 D0**
1112
1113 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1114
1115 **3. 05 00 01 07 D0**
1116
1117 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1118
1119 **4. 05 00 00 07 D0**
1120
1121 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1122
1123
1124
1125
1126 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1127
1128 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1129
1130 * (% style="color:#037691" %)**AT Command:**
1131
1132 **AT+VOLMAX   ** ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1133
1134
1135 * (% style="color:#037691" %)**Downlink Payload (prefix 0xA5):**
1136
1137 **0xA5 aa bb cc   **~/~/ Same as AT+VOLMAX=(aa bb),cc
1138
1139
1140
1141
1142 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1143
1144 * (% style="color:#037691" %)**AT Command:**
1145
1146 **AT+SETCNT=aa,(bb cc dd ee) **
1147
1148 aa: 1: Set count1,
1149
1150 2: Set count2,
1151
1152 3: Set AV1 count
1153
1154 Bb cc dd ee: number to be set
1155
1156
1157 * (% style="color:#037691" %)**Downlink Payload (prefix 0xA8):**
1158
1159 **0x A8 aa bb cc dd ee     **~/~/ same as AT+SETCNT=aa,(bb cc dd ee)
1160
1161
1162
1163
1164 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1165
1166 Clear counting for counting mode
1167
1168 * (% style="color:#037691" %)**AT Command:**
1169
1170 **AT+CLRCOUNT ** ~/~/ clear all counting
1171
1172
1173 * (% style="color:#037691" %)**Downlink Payload (prefix 0xA6):**
1174
1175 **0x A6 01    ** ~/~/ clear all counting
1176
1177
1178
1179
1180 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1181
1182 * (% style="color:#037691" %)**AT Command:**
1183
1184 **AT+COUTIME=60  **~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)
1185
1186
1187 * (% style="color:#037691" %)**Downlink Payload (prefix 0xA7):**
1188
1189 **0x A7 aa bb cc     **~/~/ same as AT+COUTIME =aa bb cc,
1190
1191 (((
1192 range: aa bb cc:0 to 16777215,  (unit:second)
1193
1194
1195 )))
1196
1197
1198
1199 == 3.5 Integrate with Mydevice ==
1200
1201 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:
1202
1203 (((
1204 (% style="color:blue" %)**Step 1**(%%): Be sure that your device is programmed and properly connected to the network at this time.
1205 )))
1206
1207 (((
1208 (% 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:
1209 )))
1210
1211 [[image:1653356737703-362.png||height="232" width="732"]]
1212
1213 [[image:image-20220524094641-11.png||height="390" width="723"]]
1214
1215
1216 [[image:image-20220524094641-12.png||height="402" width="718"]]
1217
1218
1219 (% style="color:blue" %)**Step 3**(%%): Create an account or log in Mydevices.
1220
1221 (% style="color:blue" %)**Step 4**(%%): Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1222
1223 Search under The things network
1224
1225 [[image:1653356838789-523.png||height="337" width="740"]]
1226
1227
1228
1229 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1230
1231 [[image:image-20220524094909-1.png||height="335" width="729"]]
1232
1233
1234 [[image:image-20220524094909-2.png||height="337" width="729"]]
1235
1236
1237 [[image:image-20220524094909-3.png||height="338" width="727"]]
1238
1239
1240 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1241
1242
1243 [[image:image-20220524094909-5.png||height="341" width="734"]]
1244
1245
1246
1247 == 3.6 Interface Detail ==
1248
1249 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1250
1251 Support NPN Type sensor
1252
1253 [[image:1653356991268-289.png]]
1254
1255
1256
1257 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1258
1259 (((
1260 The DI port of LT-22222-L can support NPN or PNP output sensor.
1261 )))
1262
1263 (((
1264 (((
1265 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
1266 )))
1267 )))
1268
1269 [[image:1653357170703-587.png]]
1270
1271 (((
1272 (((
1273 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1274 )))
1275 )))
1276
1277 (((
1278
1279 )))
1280
1281 (((
1282 (% style="color:blue" %)**Example1**(%%): Connect to a Low active sensor.
1283 )))
1284
1285 (((
1286 This type of sensor will output a low signal GND when active.
1287 )))
1288
1289 * (((
1290 Connect sensor’s output to DI1-
1291 )))
1292 * (((
1293 Connect sensor’s VCC to DI1+.
1294 )))
1295
1296 (((
1297 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1298 )))
1299
1300 (((
1301 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1302 )))
1303
1304 (((
1305 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.
1306 )))
1307
1308 (((
1309
1310 )))
1311
1312 (((
1313 (% style="color:blue" %)**Example2**(%%): Connect to a High active sensor.
1314 )))
1315
1316 (((
1317 This type of sensor will output a high signal (example 24v) when active.
1318 )))
1319
1320 * (((
1321 Connect sensor’s output to DI1+
1322 )))
1323 * (((
1324 Connect sensor’s GND DI1-.
1325 )))
1326
1327 (((
1328 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1329 )))
1330
1331 (((
1332 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1333 )))
1334
1335 (((
1336 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.
1337 )))
1338
1339 (((
1340
1341 )))
1342
1343 (((
1344 (% style="color:blue" %)**Example3**(%%): Connect to a 220v high active sensor.
1345 )))
1346
1347 (((
1348 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1349 )))
1350
1351 * (((
1352 Connect sensor’s output to DI1+ with a serial 50K resistor
1353 )))
1354 * (((
1355 Connect sensor’s GND DI1-.
1356 )))
1357
1358 (((
1359 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1360 )))
1361
1362 (((
1363 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1364 )))
1365
1366 (((
1367 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.
1368 )))
1369
1370
1371
1372 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1373
1374 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1375
1376 [[image:1653357531600-905.png]]
1377
1378
1379
1380 === 3.6.4 Analog Input Interface ===
1381
1382 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:
1383
1384
1385 (% style="color:blue" %)**AC2 = (IN2 voltage )/12**
1386
1387 [[image:1653357592296-182.png]]
1388
1389 Example to connect a 4~~20mA sensor
1390
1391 We take the wind speed sensor as an example for reference only.
1392
1393
1394 **Specifications of the wind speed sensor:**
1395
1396 Red:  12~~24v
1397
1398 Yellow:  4~~20mA
1399
1400 Black:  GND
1401
1402
1403 **Connection diagram:**
1404
1405 [[image:1653357640609-758.png]]
1406
1407 [[image:1653357648330-671.png||height="155" width="733"]]
1408
1409
1410
1411 === 3.6.5 Relay Output ===
1412
1413 (((
1414 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:
1415 )))
1416
1417 [[image:image-20220524100215-9.png]]
1418
1419 [[image:image-20220524100215-10.png||height="382" width="723"]]
1420
1421
1422
1423 == 3.7 LEDs Indicators ==
1424
1425 [[image:image-20220524100748-11.png]]
1426
1427
1428
1429 = 4. Use AT Command =
1430
1431 == 4.1 Access AT Command ==
1432
1433 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.
1434
1435 [[image:1653358238933-385.png]]
1436
1437
1438 (((
1439 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:
1440 )))
1441
1442 [[image:1653358355238-883.png]]
1443
1444
1445 (((
1446 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/]]
1447 )))
1448
1449 (((
1450 AT+<CMD>?        : Help on <CMD>
1451 )))
1452
1453 (((
1454 AT+<CMD>         : Run <CMD>
1455 )))
1456
1457 (((
1458 AT+<CMD>=<value> : Set the value
1459 )))
1460
1461 (((
1462 AT+<CMD>=?       : Get the value
1463 )))
1464
1465 (((
1466 ATZ: Trig a reset of the MCU
1467 )))
1468
1469 (((
1470 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1471 )))
1472
1473 (((
1474 AT+DEUI: Get or Set the Device EUI
1475 )))
1476
1477 (((
1478 AT+DADDR: Get or Set the Device Address
1479 )))
1480
1481 (((
1482 AT+APPKEY: Get or Set the Application Key
1483 )))
1484
1485 (((
1486 AT+NWKSKEY: Get or Set the Network Session Key
1487 )))
1488
1489 (((
1490 AT+APPSKEY: Get or Set the Application Session Key
1491 )))
1492
1493 (((
1494 AT+APPEUI: Get or Set the Application EUI
1495 )))
1496
1497 (((
1498 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1499 )))
1500
1501 (((
1502 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1503 )))
1504
1505 (((
1506 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1507 )))
1508
1509 (((
1510 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1511 )))
1512
1513 (((
1514 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1515 )))
1516
1517 (((
1518 AT+RX2FQ: Get or Set the Rx2 window frequency
1519 )))
1520
1521 (((
1522 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1523 )))
1524
1525 (((
1526 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1527 )))
1528
1529 (((
1530 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1531 )))
1532
1533 (((
1534 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1535 )))
1536
1537 (((
1538 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1539 )))
1540
1541 (((
1542 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1543 )))
1544
1545 (((
1546 AT+NWKID: Get or Set the Network ID
1547 )))
1548
1549 (((
1550 AT+FCU: Get or Set the Frame Counter Uplink
1551 )))
1552
1553 (((
1554 AT+FCD: Get or Set the Frame Counter Downlink
1555 )))
1556
1557 (((
1558 AT+CLASS: Get or Set the Device Class
1559 )))
1560
1561 (((
1562 AT+JOIN: Join network
1563 )))
1564
1565 (((
1566 AT+NJS: Get OTAA Join Status
1567 )))
1568
1569 (((
1570 AT+SENDB: Send hexadecimal data along with the application port
1571 )))
1572
1573 (((
1574 AT+SEND: Send text data along with the application port
1575 )))
1576
1577 (((
1578 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1579 )))
1580
1581 (((
1582 AT+RECV: Print last received data in raw format
1583 )))
1584
1585 (((
1586 AT+VER: Get current image version and Frequency Band
1587 )))
1588
1589 (((
1590 AT+CFM: Get or Set the confirmation mode (0-1)
1591 )))
1592
1593 (((
1594 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1595 )))
1596
1597 (((
1598 AT+SNR: Get the SNR of the last received packet
1599 )))
1600
1601 (((
1602 AT+RSSI: Get the RSSI of the last received packet
1603 )))
1604
1605 (((
1606 AT+TDC: Get or set the application data transmission interval in ms
1607 )))
1608
1609 (((
1610 AT+PORT: Get or set the application port
1611 )))
1612
1613 (((
1614 AT+DISAT: Disable AT commands
1615 )))
1616
1617 (((
1618 AT+PWORD: Set password, max 9 digits
1619 )))
1620
1621 (((
1622 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1623 )))
1624
1625 (((
1626 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1627 )))
1628
1629 (((
1630 AT+CFG: Print all settings
1631 )))
1632
1633
1634
1635 == 4.2 Common AT Command Sequence ==
1636
1637 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1638
1639 (((
1640
1641
1642 **If device has not joined network yet:**
1643 )))
1644
1645 (((
1646 (% style="background-color:#dcdcdc" %)123456
1647 )))
1648
1649 (((
1650 (% style="background-color:#dcdcdc" %)AT+FDR
1651 )))
1652
1653 (((
1654 (% style="background-color:#dcdcdc" %)123456
1655 )))
1656
1657 (((
1658 (% style="background-color:#dcdcdc" %)AT+NJM=0
1659 )))
1660
1661 (((
1662 (% style="background-color:#dcdcdc" %)ATZ
1663 )))
1664
1665
1666 (((
1667 **If device already joined network:**
1668 )))
1669
1670 (((
1671 (% style="background-color:#dcdcdc" %)AT+NJM=0
1672 )))
1673
1674 (((
1675 (% style="background-color:#dcdcdc" %)ATZ
1676 )))
1677
1678
1679
1680 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1681
1682 (((
1683
1684
1685 (% style="background-color:#dcdcdc" %)123456(%%)  Enter Password to have AT access.
1686 )))
1687
1688 (((
1689 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1690 )))
1691
1692 (((
1693 (% style="background-color:#dcdcdc" %) 123456(%%)  Enter Password to have AT access.
1694 )))
1695
1696 (((
1697 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1698 )))
1699
1700 (((
1701 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%)  Set to ABP mode
1702 )))
1703
1704 (((
1705 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%)  Set the Adaptive Data Rate Off
1706 )))
1707
1708 (((
1709 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1710 )))
1711
1712 (((
1713 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1714 )))
1715
1716 (((
1717 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1718 )))
1719
1720 (((
1721 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%)  Set RX2Frequency to 868.4Mhz (according to the result from server)
1722 )))
1723
1724 (((
1725 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1726 )))
1727
1728 (((
1729 (% 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.
1730 )))
1731
1732 (((
1733 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1734
1735
1736 )))
1737
1738 (((
1739 (% style="color:red" %)**Note:**
1740 )))
1741
1742 (((
1743 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1744 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1745 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.
1746 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
1747 )))
1748
1749 (((
1750 [[image:1653359097980-169.png||height="188" width="729"]]
1751 )))
1752
1753 (((
1754
1755 )))
1756
1757
1758 === 4.2.3 Change to Class A ===
1759
1760 If sensor JOINED
1761 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1762 ATZ
1763
1764
1765 = 5. FAQ =
1766
1767 == 5.1 How to upgrade the image? ==
1768
1769
1770 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1771
1772 * Support new features
1773 * For bug fix
1774 * Change LoRaWAN bands.
1775
1776 Below shows the hardware connection for how to upload an image to the LT:
1777
1778 [[image:1653359603330-121.png]]
1779
1780
1781 (((
1782 (% 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]].
1783 (% 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/]].
1784 (% style="color:blue" %)**Step3**(%%)**:** Open flashloader; choose the correct COM port to update.
1785
1786
1787 (% style="color:blue" %)**For LT-22222-L**(%%):
1788 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.
1789 )))
1790
1791 [[image:image-20220524103407-12.png]]
1792
1793 [[image:image-20220524103429-13.png]]
1794
1795 [[image:image-20220524104033-15.png]]
1796
1797
1798 (% 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:
1799
1800 [[image:1653360054704-518.png||height="186" width="745"]]
1801
1802
1803 (((
1804 (((
1805
1806
1807 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1808 )))
1809 )))
1810
1811 (((
1812 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1813 )))
1814
1815 (((
1816
1817
1818 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1819 )))
1820
1821 (((
1822 (((
1823 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1824 )))
1825 )))
1826
1827 (((
1828 (((
1829 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1830
1831
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 (((
1849 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1850 )))
1851
1852 (((
1853 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1854 (% style="background-color:#dcdcdc" %)AT+FDR(%%)  Reset Parameters to Factory Default, Keys Reserve
1855 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1856 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%) Set to ABP mode
1857 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%) Set the Adaptive Data Rate Off
1858 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1859 (% style="background-color:#dcdcdc" %)AT+TDC=60000 (%%) Set transmit interval to 60 seconds
1860 (% style="background-color:#dcdcdc" %)AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1861 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%)  Set Device Address to 26 01 1A F1
1862 (% style="background-color:#dcdcdc" %)ATZ        (%%) Reset MCU
1863 )))
1864
1865
1866 (((
1867 As shown in below:
1868 )))
1869
1870 [[image:1653360498588-932.png||height="485" width="726"]]
1871
1872
1873 == 5.4 Can I see counting event in Serial? ==
1874
1875 (((
1876 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.
1877
1878
1879 == 5.5 Can i use point to point communication for LT-22222-L? ==
1880
1881 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
1882
1883
1884 )))
1885
1886 (((
1887 == 5.6 Why does the relay output become the default and open relay after the lt22222 is powered off? ==
1888
1889 If the device is not shut down, but directly powered off.
1890
1891 It will default that this is a power-off state.
1892
1893 In modes 2 to 5, DO RO status and pulse count are saved in flash.
1894
1895 After restart, the status before power failure will be read from flash.
1896
1897
1898 = 6. Trouble Shooting =
1899 )))
1900
1901 (((
1902 (((
1903 == 6.1 Downlink doesn’t work, how to solve it? ==
1904 )))
1905 )))
1906
1907 (((
1908 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1909 )))
1910
1911 (((
1912
1913
1914 == 6.2 Have trouble to upload image. ==
1915 )))
1916
1917 (((
1918 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1919 )))
1920
1921 (((
1922
1923
1924 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1925 )))
1926
1927 (((
1928 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1929 )))
1930
1931
1932
1933 = 7. Order Info =
1934
1935
1936 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1937
1938
1939 (% style="color:#4f81bd" %)**XXX:**
1940
1941 * (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1942 * (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1943 * (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1944 * (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1945 * (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1946 * (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1947 * (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1948 * (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1949 * (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1950
1951
1952
1953 = 8. Packing Info =
1954
1955
1956 **Package Includes**:
1957
1958 * LT-22222-L I/O Controller x 1
1959 * Stick Antenna for LoRa RF part x 1
1960 * Bracket for controller x1
1961 * Program cable x 1
1962
1963 **Dimension and weight**:
1964
1965 * Device Size: 13.5 x 7 x 3 cm
1966 * Device Weight: 105g
1967 * Package Size / pcs : 14.5 x 8 x 5 cm
1968 * Weight / pcs : 170g
1969
1970
1971
1972 = 9. Support =
1973
1974 * (((
1975 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.
1976 )))
1977 * (((
1978 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]]
1979
1980
1981
1982
1983 )))
1984
1985 = 10. Reference​​​​​ =
1986
1987 * 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]]
1988 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
1989 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
1990 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]