Version 77.97 by Xiaoling on 2022/06/10 09:32
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1 (% style="text-align:center" %)
2 [[image:image-20220523163353-1.jpeg||height="604" width="500"]]
3
4 **LT-22222-L LoRa IO Controller User Manual **
5
6
7 **Table of Contents:**
8
9 {{toc/}}
10
11
12
13
14
15
16
17 = 1.Introduction =
18
19 == 1.1 What is LT Series I/O Controller ==
20
21 (((
22 The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
23 )))
24
25 (((
26 The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
27 )))
28
29 (((
30 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
31 )))
32
33 (((
34 The use environment includes:
35 )))
36
37 (((
38 1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.
39 )))
40
41 (((
42 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
43 )))
44
45 (((
46 [[image:1653295757274-912.png]]
47
48
49 )))
50
51 == 1.2  Specifications ==
52
53 (((
54
55
56 **Hardware System:**
57 )))
58
59 * (((
60 STM32L072CZT6 MCU
61 )))
62 * (((
63 SX1276/78 Wireless Chip 
64 )))
65 * (((
66 (((
67 Power Consumption:
68 )))
69
70 * (((
71 Idle: 4mA@12v
72 )))
73 * (((
74 20dB Transmit: 34mA@12v
75 )))
76 )))
77
78 (((
79 **Interface for Model: LT22222-L:**
80 )))
81
82 * (((
83 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
84 )))
85 * (((
86 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
87 )))
88 * (((
89 2 x Relay Output (5A@250VAC / 30VDC)
90 )))
91 * (((
92 2 x 0~~20mA Analog Input (res:0.01mA)
93 )))
94 * (((
95 2 x 0~~30V Analog Input (res:0.01v)
96 )))
97 * (((
98 Power Input 7~~ 24V DC. 
99 )))
100
101 (((
102 **LoRa Spec:**
103 )))
104
105 * (((
106 (((
107 Frequency Range:
108 )))
109
110 * (((
111 Band 1 (HF): 862 ~~ 1020 Mhz
112 )))
113 * (((
114 Band 2 (LF): 410 ~~ 528 Mhz
115 )))
116 )))
117 * (((
118 168 dB maximum link budget.
119 )))
120 * (((
121 +20 dBm - 100 mW constant RF output vs.
122 )))
123 * (((
124 +14 dBm high efficiency PA.
125 )))
126 * (((
127 Programmable bit rate up to 300 kbps.
128 )))
129 * (((
130 High sensitivity: down to -148 dBm.
131 )))
132 * (((
133 Bullet-proof front end: IIP3 = -12.5 dBm.
134 )))
135 * (((
136 Excellent blocking immunity.
137 )))
138 * (((
139 Low RX current of 10.3 mA, 200 nA register retention.
140 )))
141 * (((
142 Fully integrated synthesizer with a resolution of 61 Hz.
143 )))
144 * (((
145 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
146 )))
147 * (((
148 Built-in bit synchronizer for clock recovery.
149 )))
150 * (((
151 Preamble detection.
152 )))
153 * (((
154 127 dB Dynamic Range RSSI.
155 )))
156 * (((
157 Automatic RF Sense and CAD with ultra-fast AFC.
158 )))
159 * (((
160 Packet engine up to 256 bytes with CRC.
161
162
163 )))
164
165 == 1.3 Features ==
166
167 * LoRaWAN Class A & Class C protocol
168 * Optional Customized LoRa Protocol
169 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
170 * AT Commands to change parameters
171 * Remote configure parameters via LoRa Downlink
172 * Firmware upgradable via program port
173 * Counting
174
175 == 1.4  Applications ==
176
177 * Smart Buildings & Home Automation
178 * Logistics and Supply Chain Management
179 * Smart Metering
180 * Smart Agriculture
181 * Smart Cities
182 * Smart Factory
183
184 == 1.5 Hardware Variants ==
185
186 (% border="1" style="background-color:#f7faff; width:500px" %)
187 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
188 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
189 * 2 x Digital Input (Bi-direction)
190 * 2 x Digital Output
191 * 2 x Relay Output (5A@250VAC / 30VDC)
192 * 2 x 0~~20mA Analog Input (res:0.01mA)
193 * 2 x 0~~30V Analog Input (res:0.01v)
194 * 1 x Counting Port
195 )))
196
197 = 2. Power ON Device =
198
199 The LT controller can be powered by 7 ~~ 24V DC power source. Connect VIN to Power Input V+ and GND to power input V- to power the LT controller.
200
201 (((
202 PWR will on when device is properly powered.
203 )))
204
205 [[image:1653297104069-180.png]]
206
207
208
209 = 3. Operation Mode =
210
211 == 3.1 How it works? ==
212
213 (((
214 The LT is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the LT. It will auto join the network via OTAA. For LT-22222-L, the LED will show the Join status: After power on **TX LED** will fast blink 5 times, LT-22222-L will enter working mode and start to JOIN LoRaWAN network. **TX LED** will be on for 5 seconds after joined in network. When there is message from server, the **RX LED** will be on for 1 second. 
215 )))
216
217 (((
218 In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>||anchor="H4.UseATCommand"]] to set the keys in the devices.
219
220
221 )))
222
223
224
225 == 3.2 Example to join LoRaWAN network ==
226
227 (((
228 This chapter shows an example for how to join the TTN LoRaWAN Network. Below is the network structure, we use our LG308 as LoRaWAN gateway here. 
229 )))
230
231 [[image:image-20220523172350-1.png||height="266" width="864"]]
232
233 (((
234 The LG308 is already set to connect to [[TTN network >>url:https://www.thethingsnetwork.org/]]. So what we need to do now is only configure register this device to TTN:
235 )))
236
237 (((
238 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
239 )))
240
241 (((
242 Each LT is shipped with a sticker with the default device EUI as below:
243 )))
244
245 [[image:1653297924498-393.png]]
246
247 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
248
249 Add APP EUI in the application.
250
251 [[image:1653297955910-247.png||height="321" width="716"]]
252
253
254 Add APP KEY and DEV EUI
255
256 [[image:1653298023685-319.png]]
257
258
259 (((
260 **Step 2**: Power on LT and it will auto join to the TTN network. After join success, it will start to upload message to TTN and user can see in the panel.
261 )))
262
263 [[image:1653298044601-602.png||height="405" width="709"]]
264
265
266
267 == 3.3 Uplink Payload ==
268
269 There are five working modes + one interrupt mode on LT for different type application:
270
271 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
272 * **MOD2**: Double DI Counting + DO + RO
273 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
274 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
275 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
276 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
277
278
279 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
280
281 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
282
283 [[image:image-20220523174024-3.png]]
284
285 (((
286
287
288 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
289 )))
290
291 [[image:image-20220523174254-4.png]]
292
293 * RO is for relay. ROx=1 : close，ROx=0 always open.
294 * DI is for digital input. DIx=1: high or float, DIx=0: low.
295 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
296
297 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
298
299 For example if payload is: [[image:image-20220523175847-2.png]]
300
301
302 **The value for the interface is:  **
303
304 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
305
306 AVI2 channel voltage is 0x04AC/1000=1.196V
307
308 ACI1 channel current is 0x1310/1000=4.880mA
309
310 ACI2 channel current is 0x1300/1000=4.864mA
311
312 The last byte 0xAA= 10101010(B) means
313
314 * [1] RO1 relay channel is close and the RO1 LED is ON.
315 * [0] RO2 relay channel is open and RO2 LED is OFF;
316
317
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
335 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
336
337
338 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
339
340 (((
341 Total : 11 bytes payload
342 )))
343
344 [[image:image-20220523180452-3.png]]
345
346
347 (((
348 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
349 )))
350
351 [[image:image-20220523180506-4.png]]
352
353 * RO is for relay. ROx=1 : close，ROx=0 always open.
354 * FIRST: Indicate this is the first packet after join network.
355 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
356
357 (((
358 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
359 )))
360
361 (((
362
363
364 **To use counting mode, please run:**
365 )))
366
367 (% class="box infomessage" %)
368 (((
369 (((
370 **AT+MOD=2**
371 )))
372 )))
373
374 (% class="box infomessage" %)
375 (((
376 (((
377 **ATZ**
378 )))
379 )))
380
381 (((
382
383
384 (% style="color:#4f81bd" %)**AT Commands for counting:**
385 )))
386
387 (((
388 **For LT22222-L:**
389 )))
390
391 (% class="box infomessage" %)
392 (((
393 (((
394 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
395 )))
396 )))
397
398 (% class="box infomessage" %)
399 (((
400 (((
401 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
402 )))
403 )))
404
405 (% class="box infomessage" %)
406 (((
407 (((
408 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
409 )))
410 )))
411
412 (% class="box infomessage" %)
413 (((
414 (((
415 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
416 )))
417 )))
418
419 (% class="box infomessage" %)
420 (((
421 (((
422 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
423 )))
424 )))
425
426 (% class="box infomessage" %)
427 (((
428 (((
429 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
430 )))
431 )))
432
433
434
435 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
436
437 **LT22222-L**: This mode the DI1 is used as a counting pin.
438
439 [[image:image-20220523181246-5.png]]
440
441 (((
442 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
443 )))
444
445 [[image:image-20220523181301-6.png]]
446
447 * RO is for relay. ROx=1 : close，ROx=0 always open.
448 * FIRST: Indicate this is the first packet after join network.
449 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
450
451 (((
452 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
453 )))
454
455 (((
456 **To use counting mode, please run:**
457 )))
458
459 (% class="box infomessage" %)
460 (((
461 (((
462 **AT+MOD=3**
463 )))
464 )))
465
466 (% class="box infomessage" %)
467 (((
468 (((
469 **ATZ**
470 )))
471 )))
472
473 (((
474 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
475
476
477 )))
478
479
480 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
481
482
483 **LT22222-L**: This mode the DI1 is used as a counting pin.
484
485 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.
486
487 [[image:image-20220523181903-8.png]]
488
489
490 (((
491 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
492 )))
493
494 [[image:image-20220523181727-7.png]]
495
496 * RO is for relay. ROx=1 : close，ROx=0 always open.
497 * FIRST: Indicate this is the first packet after join network.
498 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
499
500 (((
501 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
502 )))
503
504 (((
505
506
507 **To use this mode, please run:**
508 )))
509
510 (% class="box infomessage" %)
511 (((
512 (((
513 **AT+MOD=4**
514 )))
515 )))
516
517 (% class="box infomessage" %)
518 (((
519 (((
520 **ATZ**
521 )))
522 )))
523
524 (((
525
526 )))
527
528 (((
529 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
530 )))
531
532 (((
533
534
535 **Plus below command for AVI1 Counting:**
536 )))
537
538 (% class="box infomessage" %)
539 (((
540 (((
541 **AT+SETCNT=3,60   (set AVI Count to 60)**
542 )))
543 )))
544
545 (% class="box infomessage" %)
546 (((
547 (((
548 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
549 )))
550 )))
551
552 (% class="box infomessage" %)
553 (((
554 (((
555 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
556 )))
557 )))
558
559 (% class="box infomessage" %)
560 (((
561 (((
562 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
563 )))
564 )))
565
566
567
568 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
569
570
571 **LT22222-L**: This mode the DI1 is used as a counting pin.
572
573 [[image:image-20220523182334-9.png]]
574
575 (((
576
577
578 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
579 )))
580
581 * RO is for relay. ROx=1 : close，ROx=0 always open.
582 * FIRST: Indicate this is the first packet after join network.
583 * (((
584 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
585 )))
586
587 (((
588 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
589 )))
590
591 (((
592
593
594 **To use this mode, please run:**
595 )))
596
597 (% class="box infomessage" %)
598 (((
599 (((
600 **AT+MOD=5**
601 )))
602 )))
603
604 (% class="box infomessage" %)
605 (((
606 (((
607 **ATZ**
608 )))
609 )))
610
611 (((
612 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
613 )))
614
615
616
617 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
618
619
620 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
621
622 For example, if user has configured below commands:
623
624 * **AT+MOD=1 ** **~-~->** The normal working mode
625 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
626
627
628 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
629
630 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
631 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.**
632
633
634
635 **AT Command to set Trigger Condition**:
636
637 (% style="color:#4f81bd" %)**Trigger base on voltage**:
638
639 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
640
641 **Example:**
642
643 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)
644
645 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
646
647
648
649 (% style="color:#4f81bd" %)**Trigger base on current**:
650
651 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
652
653 **Example:**
654
655 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
656
657
658
659 (% style="color:#4f81bd" %)**Trigger base on DI status**:
660
661 DI status trigger Flag.
662
663 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
664
665
666 **Example:**
667
668 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
669
670
671 **Downlink Command to set Trigger Condition:**
672
673 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
674
675 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
676
677 AA: Code for this downlink Command:
678
679 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
680
681 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
682
683 yy2 yy2: AC1 or AV1 high limit.
684
685 yy3 yy3: AC2 or AV2 low limit.
686
687 Yy4 yy4: AC2 or AV2 high limit.
688
689
690 **Example1**: AA 00 13 88 00 00 00 00 00 00
691
692 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
693
694
695 **Example2**: AA 02 01 00
696
697 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
698
699
700
701 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
702
703 MOD6 Payload : total 11 bytes payload
704
705 [[image:image-20220524085923-1.png]]
706
707
708 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
709
710 [[image:image-20220524090106-2.png]]
711
712 * Each bits shows if the corresponding trigger has been configured.
713
714
715
716 **Example:**
717
718 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
719
720
721 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
722
723 [[image:image-20220524090249-3.png]]
724
725 * Each bits shows which status has been trigger on this uplink.
726
727
728
729 **Example:**
730
731 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
732
733
734 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
735
736 [[image:image-20220524090456-4.png]]
737
738 * Each bits shows which status has been trigger on this uplink.
739
740
741
742 **Example:**
743
744 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
745
746 00000101: Means both DI1 and DI2 trigger are enabled.
747
748
749 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
750
751 Downlink command to poll MOD6 status:
752
753 **AB 06**
754
755 When device got this command, it will send the MOD6 payload.
756
757
758
759 === 3.3.7 Payload Decoder ===
760
761 (((
762
763
764 **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/]]
765
766
767 )))
768
769
770
771 == 3.4 ​Configure LT via AT or Downlink ==
772
773 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
774
775 (((
776 There are two kinds of Commands:
777 )))
778
779 * (% 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]]
780
781 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
782
783
784
785 === 3.4.1 Common Commands ===
786
787 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]]
788
789
790
791 === 3.4.2 Sensor related commands ===
792
793 ==== 3.4.2.1 Set Transmit Interval ====
794
795 Set device uplink interval.
796
797 * AT Command:
798
799 (% class="box infomessage" %)
800 (((
801 **AT+TDC=N **
802 )))
803
804 **Example: **AT+TDC=30000. Means set interval to 30 seconds
805
806
807 * Downlink Payload (prefix 0x01):
808
809 (% class="box infomessage" %)
810 (((
811 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
812 )))
813
814
815
816 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
817
818 Set work mode.
819
820 * AT Command:
821
822 (% class="box infomessage" %)
823 (((
824 **AT+MOD=N  **
825 )))
826
827 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
828
829
830 * Downlink Payload (prefix 0x0A):
831
832 (% class="box infomessage" %)
833 (((
834 **0x0A aa     ~/~/ Same as AT+MOD=aa**
835 )))
836
837
838
839 ==== 3.4.2.3 Poll an uplink ====
840
841 * AT Command:
842
843 There is no AT Command to poll uplink
844
845
846 * Downlink Payload (prefix 0x08):
847
848 (% class="box infomessage" %)
849 (((
850 **0x08 FF     ~/~/ Poll an uplink,**
851 )))
852
853 **Example**: 0x08FF, ask device to send an Uplink
854
855
856
857 ==== 3.4.2.4 Enable Trigger Mode ====
858
859 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
860
861 * AT Command:
862
863 (% class="box infomessage" %)
864 (((
865 **AT+ADDMOD6=1 or 0**
866 )))
867
868 1: Enable Trigger Mode
869
870 0: Disable Trigger Mode
871
872
873 * Downlink Payload (prefix 0x0A 06):
874
875 (% class="box infomessage" %)
876 (((
877 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
878 )))
879
880
881
882 ==== 3.4.2.5 Poll trigger settings ====
883
884 Poll trigger settings,
885
886 * AT Command:
887
888 There is no AT Command for this feature.
889
890
891 * Downlink Payload (prefix 0x AB 06):
892
893 (% class="box infomessage" %)
894 (((
895 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
896 )))
897
898
899
900 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
901
902 Enable Disable DI1/DI2/DI2 as trigger,
903
904 * AT Command:
905
906 (% class="box infomessage" %)
907 (((
908 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
909 )))
910
911
912 **Example:**
913
914 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
915
916 * Downlink Payload (prefix 0xAA 02):
917
918 (% class="box infomessage" %)
919 (((
920 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
921 )))
922
923
924
925 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
926
927 Set DI1 or DI3(for LT-33222-L) trigger.
928
929 * AT Command:
930
931 (% class="box infomessage" %)
932 (((
933 **AT+TRIG1=a,b**
934 )))
935
936 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
937
938 b : delay timing.
939
940
941 **Example:**
942
943 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
944
945
946 * Downlink Payload (prefix 0x09 01 ):
947
948 (% class="box infomessage" %)
949 (((
950 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
951 )))
952
953
954
955 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
956
957 Set DI2 trigger.
958
959 * AT Command:
960
961 (% class="box infomessage" %)
962 (((
963 **AT+TRIG2=a,b**
964 )))
965
966 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
967
968 b : delay timing.
969
970
971 **Example:**
972
973 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
974
975
976 * Downlink Payload (prefix 0x09 02 ):
977
978 (% class="box infomessage" %)
979 (((
980 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
981 )))
982
983
984
985 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
986
987 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
988
989 * AT Command:
990
991 (% class="box infomessage" %)
992 (((
993 **AT+ACLIM. **
994 )))
995
996
997 * Downlink Payload (prefix 0xAA 01 ):
998
999 (% class="box infomessage" %)
1000 (((
1001 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
1002 )))
1003
1004
1005
1006 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
1007
1008 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
1009
1010 * AT Command:
1011
1012 (% class="box infomessage" %)
1013 (((
1014 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
1015 )))
1016
1017
1018 * Downlink Payload (prefix 0xAA 00 ):
1019
1020 (% class="box infomessage" %)
1021 (((
1022 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
1023 )))
1024
1025
1026
1027 ==== 3.4.2.11 Trigger – Set minimum interval ====
1028
1029 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
1030
1031 * AT Command:
1032
1033 (% class="box infomessage" %)
1034 (((
1035 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
1036 )))
1037
1038
1039 * Downlink Payload (prefix 0xAC ):
1040
1041 (% class="box infomessage" %)
1042 (((
1043 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
1044 )))
1045
1046
1047
1048 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1049
1050 * AT Command:
1051
1052 There is no AT Command to control Digital Output
1053
1054
1055 * Downlink Payload (prefix 0x02):
1056
1057 (% class="box infomessage" %)
1058 (((
1059 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1060 )))
1061
1062 (((
1063 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1064 )))
1065
1066 (((
1067 01: Low,  00: High ,  11: No action
1068 )))
1069
1070 [[image:image-20220524092754-5.png]]
1071
1072 (((
1073 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1074 )))
1075
1076 (((
1077 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1078 )))
1079
1080
1081
1082 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1083
1084 * AT Command:
1085
1086 There is no AT Command to control Digital Output
1087
1088
1089 * Downlink Payload (prefix 0xA9):
1090
1091 (% class="box infomessage" %)
1092 (((
1093 (((
1094 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1095 )))
1096 )))
1097
1098 This is to control the digital output time of DO pin. Include four bytes:
1099
1100 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1101
1102 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1103
1104 01: DO pins will change back to original state after timeout.
1105
1106 00: DO pins will change to an inverter state after timeout 
1107
1108
1109 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1110
1111 [[image:image-20220524093238-6.png]]
1112
1113
1114 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1115
1116 [[image:image-20220524093328-7.png]]
1117
1118
1119 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1120
1121 [[image:image-20220524093351-8.png]]
1122
1123
1124 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1125
1126 Latching time. Unit: ms
1127
1128 Device will upload a packet if downlink code executes successfully.
1129
1130
1131 **Example payload:**
1132
1133 **~1. A9 01 01 01 01 07 D0**
1134
1135 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1136
1137 **2. A9 01 00 01 11 07 D0**
1138
1139 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1140
1141 **3. A9 00 00 00 00 07 D0**
1142
1143 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1144
1145 **4. A9 00 11 01 00 07 D0**
1146
1147 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
1148
1149
1150
1151 ==== 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ====
1152
1153 * AT Command:
1154
1155 There is no AT Command to control Relay Output
1156
1157
1158 * Downlink Payload (prefix 0x03):
1159
1160 (% class="box infomessage" %)
1161 (((
1162 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1163 )))
1164
1165 (((
1166 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1167 )))
1168
1169 (((
1170 01: Close ,  00: Open , 11: No action
1171 )))
1172
1173 (((
1174 [[image:image-20220524093724-9.png]]
1175 )))
1176
1177 Device will upload a packet if downlink code executes successfully.
1178
1179
1180
1181 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1182
1183 * AT Command:
1184
1185 There is no AT Command to control Relay Output
1186
1187
1188 * Downlink Payload (prefix 0x05):
1189
1190 (% class="box infomessage" %)
1191 (((
1192 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1193 )))
1194
1195 This is to control the relay output time of relay. Include four bytes:
1196
1197 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1198
1199 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1200
1201 01: Relays will change back to original state after timeout.
1202
1203 00: Relays will change to an inverter state after timeout
1204
1205
1206 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1207
1208 [[image:image-20220524093831-10.png]]
1209
1210
1211 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1212
1213 Device will upload a packet if downlink code executes successfully.
1214
1215
1216 **Example payload:**
1217
1218 **~1. 05 01 11 07 D0**
1219
1220 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1221
1222 **2. 05 01 10 07 D0**
1223
1224 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1225
1226 **3. 05 00 01 07 D0**
1227
1228 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1229
1230 **4. 05 00 00 07 D0**
1231
1232 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1233
1234
1235
1236 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1237
1238 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1239
1240 * AT Command:
1241
1242 (% class="box infomessage" %)
1243 (((
1244 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1245 )))
1246
1247
1248 * Downlink Payload (prefix 0xA5):
1249
1250 (% class="box infomessage" %)
1251 (((
1252 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1253 )))
1254
1255
1256
1257 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1258
1259 * AT Command:
1260
1261 (% class="box infomessage" %)
1262 (((
1263 **AT+SETCNT=aa,(bb cc dd ee) **
1264 )))
1265
1266 aa: 1: Set count1,
1267
1268 2: Set count2,
1269
1270 3: Set AV1 count
1271
1272 Bb cc dd ee: number to be set
1273
1274
1275 * Downlink Payload (prefix 0xA8):
1276
1277 (% class="box infomessage" %)
1278 (((
1279 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1280 )))
1281
1282
1283
1284 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1285
1286 Clear counting for counting mode
1287
1288 * AT Command:
1289
1290 (% class="box infomessage" %)
1291 (((
1292 **AT+CLRCOUNT ~/~/ clear all counting**
1293 )))
1294
1295 * Downlink Payload (prefix 0xA6):
1296
1297 (% class="box infomessage" %)
1298 (((
1299 **0x A6 01     ~/~/ clear all counting,**
1300 )))
1301
1302
1303
1304 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1305
1306 * AT Command:
1307
1308 (% class="box infomessage" %)
1309 (((
1310 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1311 )))
1312
1313 * Downlink Payload (prefix 0xA7):
1314
1315 (% class="box infomessage" %)
1316 (((
1317 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1318 )))
1319
1320 (((
1321 range: aa bb cc:0 to 16777215,  (unit:second)
1322
1323
1324 )))
1325
1326
1327 == 3.5 Integrate with Mydevice ==
1328
1329 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:
1330
1331 (((
1332 (% style="color:blue" %)**Step 1**(%%): Be sure that your device is programmed and properly connected to the network at this time.
1333 )))
1334
1335 (((
1336 (% 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:
1337 )))
1338
1339 [[image:1653356737703-362.png||height="232" width="732"]]
1340
1341 [[image:image-20220524094641-11.png||height="390" width="723"]]
1342
1343
1344 [[image:image-20220524094641-12.png||height="402" width="718"]]
1345
1346
1347 (% style="color:blue" %)**Step 3**(%%): Create an account or log in Mydevices.
1348
1349 (% style="color:blue" %)**Step 4**(%%): Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1350
1351 Search under The things network
1352
1353 [[image:1653356838789-523.png||height="337" width="740"]]
1354
1355
1356
1357 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1358
1359 [[image:image-20220524094909-1.png||height="335" width="729"]]
1360
1361
1362 [[image:image-20220524094909-2.png||height="337" width="729"]]
1363
1364
1365 [[image:image-20220524094909-3.png||height="338" width="727"]]
1366
1367
1368 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1369
1370
1371 [[image:image-20220524094909-5.png||height="341" width="734"]]
1372
1373
1374
1375 == 3.6 Interface Detail ==
1376
1377 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1378
1379 Support NPN Type sensor
1380
1381 [[image:1653356991268-289.png]]
1382
1383
1384
1385 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1386
1387 (((
1388 The DI port of LT-22222-L can support NPN or PNP output sensor.
1389 )))
1390
1391 (((
1392 (((
1393 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
1394 )))
1395 )))
1396
1397 [[image:1653357170703-587.png]]
1398
1399 (((
1400 (((
1401 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1402 )))
1403 )))
1404
1405 (((
1406
1407 )))
1408
1409 (((
1410 (% style="color:blue" %)**Example1**(%%): Connect to a Low active sensor.
1411 )))
1412
1413 (((
1414 This type of sensor will output a low signal GND when active.
1415 )))
1416
1417 * (((
1418 Connect sensor’s output to DI1-
1419 )))
1420 * (((
1421 Connect sensor’s VCC to DI1+.
1422 )))
1423
1424 (((
1425 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1426 )))
1427
1428 (((
1429 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1430 )))
1431
1432 (((
1433 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.
1434 )))
1435
1436 (((
1437
1438 )))
1439
1440 (((
1441 (% style="color:blue" %)**Example2**(%%): Connect to a High active sensor.
1442 )))
1443
1444 (((
1445 This type of sensor will output a high signal (example 24v) when active.
1446 )))
1447
1448 * (((
1449 Connect sensor’s output to DI1+
1450 )))
1451 * (((
1452 Connect sensor’s GND DI1-.
1453 )))
1454
1455 (((
1456 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1457 )))
1458
1459 (((
1460 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1461 )))
1462
1463 (((
1464 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.
1465 )))
1466
1467 (((
1468
1469 )))
1470
1471 (((
1472 (% style="color:blue" %)**Example3**(%%): Connect to a 220v high active sensor.
1473 )))
1474
1475 (((
1476 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1477 )))
1478
1479 * (((
1480 Connect sensor’s output to DI1+ with a serial 50K resistor
1481 )))
1482 * (((
1483 Connect sensor’s GND DI1-.
1484 )))
1485
1486 (((
1487 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1488 )))
1489
1490 (((
1491 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1492 )))
1493
1494 (((
1495 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.
1496 )))
1497
1498
1499
1500 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1501
1502 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1503
1504 [[image:1653357531600-905.png]]
1505
1506
1507
1508 === 3.6.4 Analog Input Interface ===
1509
1510 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:
1511
1512
1513 (% style="color:blue" %)**AC2 = (IN2 voltage )/12**
1514
1515 [[image:1653357592296-182.png]]
1516
1517 Example to connect a 4~~20mA sensor
1518
1519 We take the wind speed sensor as an example for reference only.
1520
1521
1522 **Specifications of the wind speed sensor:**
1523
1524 Red:  12~~24v
1525
1526 Yellow:  4~~20mA
1527
1528 Black:  GND
1529
1530
1531 **Connection diagram:**
1532
1533 [[image:1653357640609-758.png]]
1534
1535 [[image:1653357648330-671.png||height="155" width="733"]]
1536
1537
1538
1539 === 3.6.5 Relay Output ===
1540
1541 (((
1542 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:
1543 )))
1544
1545 [[image:image-20220524100215-9.png]]
1546
1547 [[image:image-20220524100215-10.png||height="382" width="723"]]
1548
1549
1550
1551 == 3.7 LEDs Indicators ==
1552
1553 [[image:image-20220524100748-11.png]]
1554
1555
1556 = 4. Use AT Command =
1557
1558 == 4.1 Access AT Command ==
1559
1560 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.
1561
1562 [[image:1653358238933-385.png]]
1563
1564
1565 (((
1566 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:
1567 )))
1568
1569 [[image:1653358355238-883.png]]
1570
1571
1572 (((
1573 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/]]
1574 )))
1575
1576 (((
1577 AT+<CMD>?        : Help on <CMD>
1578 )))
1579
1580 (((
1581 AT+<CMD>         : Run <CMD>
1582 )))
1583
1584 (((
1585 AT+<CMD>=<value> : Set the value
1586 )))
1587
1588 (((
1589 AT+<CMD>=?       : Get the value
1590 )))
1591
1592 (((
1593 ATZ: Trig a reset of the MCU
1594 )))
1595
1596 (((
1597 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1598 )))
1599
1600 (((
1601 AT+DEUI: Get or Set the Device EUI
1602 )))
1603
1604 (((
1605 AT+DADDR: Get or Set the Device Address
1606 )))
1607
1608 (((
1609 AT+APPKEY: Get or Set the Application Key
1610 )))
1611
1612 (((
1613 AT+NWKSKEY: Get or Set the Network Session Key
1614 )))
1615
1616 (((
1617 AT+APPSKEY: Get or Set the Application Session Key
1618 )))
1619
1620 (((
1621 AT+APPEUI: Get or Set the Application EUI
1622 )))
1623
1624 (((
1625 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1626 )))
1627
1628 (((
1629 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1630 )))
1631
1632 (((
1633 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1634 )))
1635
1636 (((
1637 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1638 )))
1639
1640 (((
1641 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1642 )))
1643
1644 (((
1645 AT+RX2FQ: Get or Set the Rx2 window frequency
1646 )))
1647
1648 (((
1649 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1650 )))
1651
1652 (((
1653 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1654 )))
1655
1656 (((
1657 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1658 )))
1659
1660 (((
1661 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1662 )))
1663
1664 (((
1665 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1666 )))
1667
1668 (((
1669 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1670 )))
1671
1672 (((
1673 AT+NWKID: Get or Set the Network ID
1674 )))
1675
1676 (((
1677 AT+FCU: Get or Set the Frame Counter Uplink
1678 )))
1679
1680 (((
1681 AT+FCD: Get or Set the Frame Counter Downlink
1682 )))
1683
1684 (((
1685 AT+CLASS: Get or Set the Device Class
1686 )))
1687
1688 (((
1689 AT+JOIN: Join network
1690 )))
1691
1692 (((
1693 AT+NJS: Get OTAA Join Status
1694 )))
1695
1696 (((
1697 AT+SENDB: Send hexadecimal data along with the application port
1698 )))
1699
1700 (((
1701 AT+SEND: Send text data along with the application port
1702 )))
1703
1704 (((
1705 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1706 )))
1707
1708 (((
1709 AT+RECV: Print last received data in raw format
1710 )))
1711
1712 (((
1713 AT+VER: Get current image version and Frequency Band
1714 )))
1715
1716 (((
1717 AT+CFM: Get or Set the confirmation mode (0-1)
1718 )))
1719
1720 (((
1721 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1722 )))
1723
1724 (((
1725 AT+SNR: Get the SNR of the last received packet
1726 )))
1727
1728 (((
1729 AT+RSSI: Get the RSSI of the last received packet
1730 )))
1731
1732 (((
1733 AT+TDC: Get or set the application data transmission interval in ms
1734 )))
1735
1736 (((
1737 AT+PORT: Get or set the application port
1738 )))
1739
1740 (((
1741 AT+DISAT: Disable AT commands
1742 )))
1743
1744 (((
1745 AT+PWORD: Set password, max 9 digits
1746 )))
1747
1748 (((
1749 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1750 )))
1751
1752 (((
1753 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1754 )))
1755
1756 (((
1757 AT+CFG: Print all settings
1758
1759
1760 )))
1761
1762
1763
1764 == 4.2 Common AT Command Sequence ==
1765
1766 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1767
1768 (((
1769
1770
1771 **If device has not joined network yet:**
1772 )))
1773
1774 (((
1775 (% style="background-color:#dcdcdc" %)123456
1776 )))
1777
1778 (((
1779 (% style="background-color:#dcdcdc" %)AT+FDR
1780 )))
1781
1782 (((
1783 (% style="background-color:#dcdcdc" %)123456
1784 )))
1785
1786 (((
1787 (% style="background-color:#dcdcdc" %)AT+NJM=0
1788 )))
1789
1790 (((
1791 (% style="background-color:#dcdcdc" %)ATZ
1792 )))
1793
1794
1795 (((
1796 **If device already joined network:**
1797 )))
1798
1799 (((
1800 (% style="background-color:#dcdcdc" %)AT+NJM=0
1801 )))
1802
1803 (((
1804 (% style="background-color:#dcdcdc" %)ATZ
1805
1806
1807 )))
1808
1809
1810
1811 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1812
1813 (((
1814
1815
1816 (% style="background-color:#dcdcdc" %)123456(%%)  Enter Password to have AT access.
1817 )))
1818
1819 (((
1820 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1821 )))
1822
1823 (((
1824 (% style="background-color:#dcdcdc" %) 123456(%%)  Enter Password to have AT access.
1825 )))
1826
1827 (((
1828 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1829 )))
1830
1831 (((
1832 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%)  Set to ABP mode
1833 )))
1834
1835 (((
1836 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%)  Set the Adaptive Data Rate Off
1837 )))
1838
1839 (((
1840 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1841 )))
1842
1843 (((
1844 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1845 )))
1846
1847 (((
1848 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1849 )))
1850
1851 (((
1852 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%)  Set RX2Frequency to 868.4Mhz (according to the result from server)
1853 )))
1854
1855 (((
1856 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1857 )))
1858
1859 (((
1860 (% 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.
1861 )))
1862
1863 (((
1864 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1865
1866
1867 )))
1868
1869 (((
1870 (% style="color:red" %)**Note:**
1871 )))
1872
1873 (((
1874 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1875 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1876 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.
1877 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
1878 )))
1879
1880 (((
1881 [[image:1653359097980-169.png||height="188" width="729"]]
1882 )))
1883
1884 (((
1885
1886 )))
1887
1888
1889 === 4.2.3 Change to Class A ===
1890
1891 If sensor JOINED
1892 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1893 ATZ
1894
1895
1896 = 5. FAQ =
1897
1898 == 5.1 How to upgrade the image? ==
1899
1900
1901 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1902
1903 * Support new features
1904 * For bug fix
1905 * Change LoRaWAN bands.
1906
1907 Below shows the hardware connection for how to upload an image to the LT:
1908
1909 [[image:1653359603330-121.png]]
1910
1911
1912 (((
1913 (% 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]].
1914 (% 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/]].
1915 (% style="color:blue" %)**Step3**(%%)**:** Open flashloader; choose the correct COM port to update.
1916
1917
1918 (% style="color:blue" %)**For LT-22222-L**(%%):
1919 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.
1920 )))
1921
1922 [[image:image-20220524103407-12.png]]
1923
1924 [[image:image-20220524103429-13.png]]
1925
1926 [[image:image-20220524104033-15.png]]
1927
1928
1929 (% 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:
1930
1931 [[image:1653360054704-518.png||height="186" width="745"]]
1932
1933
1934 (((
1935 (((
1936
1937
1938 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1939 )))
1940 )))
1941
1942 (((
1943 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1944 )))
1945
1946 (((
1947
1948
1949 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1950 )))
1951
1952 (((
1953 (((
1954 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1955 )))
1956 )))
1957
1958 (((
1959 (((
1960 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1961
1962
1963 )))
1964 )))
1965
1966 (((
1967 (% 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.
1968 )))
1969
1970 (((
1971 [[image:1653360231087-571.png||height="401" width="727"]]
1972 )))
1973
1974 (((
1975 (% 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.
1976 )))
1977
1978
1979 (((
1980 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1981 )))
1982
1983 (((
1984 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1985 (% style="background-color:#dcdcdc" %)AT+FDR(%%)  Reset Parameters to Factory Default, Keys Reserve
1986 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1987 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%) Set to ABP mode
1988 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%) Set the Adaptive Data Rate Off
1989 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1990 (% style="background-color:#dcdcdc" %)AT+TDC=60000 (%%) Set transmit interval to 60 seconds
1991 (% style="background-color:#dcdcdc" %)AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1992 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%)  Set Device Address to 26 01 1A F1
1993 (% style="background-color:#dcdcdc" %)ATZ        (%%) Reset MCU
1994 )))
1995
1996
1997 (((
1998 As shown in below:
1999 )))
2000
2001 [[image:1653360498588-932.png||height="485" width="726"]]
2002
2003
2004 == 5.4 Can I see counting event in Serial? ==
2005
2006 (((
2007 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.
2008
2009
2010 == 5.5 Can i use point to point communication for LT-22222-L? ==
2011
2012 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
2013 )))
2014
2015 (((
2016
2017
2018 = 6. Trouble Shooting =
2019 )))
2020
2021 (((
2022 (((
2023 == 6.1 Downlink doesn’t work, how to solve it? ==
2024 )))
2025 )))
2026
2027 (((
2028 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
2029 )))
2030
2031 (((
2032
2033
2034 == 6.2 Have trouble to upload image. ==
2035 )))
2036
2037 (((
2038 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
2039 )))
2040
2041 (((
2042
2043
2044 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
2045 )))
2046
2047 (((
2048 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
2049 )))
2050
2051
2052
2053 = 7. Order Info =
2054
2055
2056 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
2057
2058
2059 (% style="color:#4f81bd" %)**XXX:**
2060
2061 * (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
2062 * (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
2063 * (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
2064 * (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
2065 * (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
2066 * (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
2067 * (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2068 * (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2069 * (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2070
2071 = 8. Packing Info =
2072
2073
2074 **Package Includes**:
2075
2076 * LT-22222-L I/O Controller x 1
2077 * Stick Antenna for LoRa RF part x 1
2078 * Bracket for controller x1
2079 * Program cable x 1
2080
2081 **Dimension and weight**:
2082
2083 * Device Size: 13.5 x 7 x 3 cm
2084 * Device Weight: 105g
2085 * Package Size / pcs : 14.5 x 8 x 5 cm
2086 * Weight / pcs : 170g
2087
2088 = 9. Support =
2089
2090 * (((
2091 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.
2092 )))
2093 * (((
2094 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]]
2095 )))
2096
2097 = 10. Reference​​​​​ =
2098
2099 * 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]]
2100 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2101 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2102 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]

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