Version 78.1 by Xiaoling on 2022/06/10 09:38
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1 (% style="text-align:center" %)
2 [[image:image-20220523163353-1.jpeg||height="604" width="500"]]
3
4 **LT-22222-L LoRa IO Controller User Manual **
5
6
7 **Table of Contents:**
8
9 {{toc/}}
10
11
12
13
14
15
16
17 = 1.Introduction =
18
19 == 1.1 What is LT Series I/O Controller ==
20
21 (((
22 The Dragino (% style="color:blue" %)**LT series I/O Modules**(%%) are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as:** (% style="color:blue" %)analog current Input, analog voltage input(%%)**(% style="color:blue" %), **relay output**, **digital input**(%%) and (% style="color:blue" %)**digital output**(%%) etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
23 )))
24
25 (((
26 The LT I/O Controllers allows the user to send data and reach extremely long ranges. It provides ultra-long range spread spectrum communication and high interference immunity whilst minimizing current consumption. It targets professional wireless sensor network applications such as irrigation systems, smart metering, smart cities, smartphone detection, building automation, and so on.
27 )))
28
29 (((
30 The LT I/O Controllers is aiming to provide an (% style="color:blue" %)**easy and low cost installation** (%%)by using LoRa wireless technology.
31 )))
32
33 (((
34 The use environment includes:
35 )))
36
37 (((
38 1) If user’s area has LoRaWAN service coverage, they can just install the I/O controller and configure it to connect the LoRaWAN provider via wireless.
39 )))
40
41 (((
42 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
43 )))
44
45 (((
46 [[image:1653295757274-912.png]]
47
48
49 )))
50
51 == 1.2  Specifications ==
52
53 (((
54
55
56 **Hardware System:**
57 )))
58
59 * (((
60 STM32L072CZT6 MCU
61 )))
62 * (((
63 SX1276/78 Wireless Chip 
64 )))
65 * (((
66 (((
67 Power Consumption:
68 )))
69
70 * (((
71 Idle: 4mA@12v
72 )))
73 * (((
74 20dB Transmit: 34mA@12v
75 )))
76 )))
77
78 (((
79
80
81 **Interface for Model: LT22222-L:**
82 )))
83
84 * (((
85 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
86 )))
87 * (((
88 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
89 )))
90 * (((
91 2 x Relay Output (5A@250VAC / 30VDC)
92 )))
93 * (((
94 2 x 0~~20mA Analog Input (res:0.01mA)
95 )))
96 * (((
97 2 x 0~~30V Analog Input (res:0.01v)
98 )))
99 * (((
100 Power Input 7~~ 24V DC. 
101 )))
102
103 (((
104
105
106 **LoRa Spec:**
107 )))
108
109 * (((
110 (((
111 Frequency Range:
112 )))
113
114 * (((
115 Band 1 (HF): 862 ~~ 1020 Mhz
116 )))
117 * (((
118 Band 2 (LF): 410 ~~ 528 Mhz
119 )))
120 )))
121 * (((
122 168 dB maximum link budget.
123 )))
124 * (((
125 +20 dBm - 100 mW constant RF output vs.
126 )))
127 * (((
128 +14 dBm high efficiency PA.
129 )))
130 * (((
131 Programmable bit rate up to 300 kbps.
132 )))
133 * (((
134 High sensitivity: down to -148 dBm.
135 )))
136 * (((
137 Bullet-proof front end: IIP3 = -12.5 dBm.
138 )))
139 * (((
140 Excellent blocking immunity.
141 )))
142 * (((
143 Low RX current of 10.3 mA, 200 nA register retention.
144 )))
145 * (((
146 Fully integrated synthesizer with a resolution of 61 Hz.
147 )))
148 * (((
149 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
150 )))
151 * (((
152 Built-in bit synchronizer for clock recovery.
153 )))
154 * (((
155 Preamble detection.
156 )))
157 * (((
158 127 dB Dynamic Range RSSI.
159 )))
160 * (((
161 Automatic RF Sense and CAD with ultra-fast AFC.
162 )))
163 * (((
164 Packet engine up to 256 bytes with CRC.
165 )))
166
167
168
169 == 1.3 Features ==
170
171 * LoRaWAN Class A & Class C protocol
172 * Optional Customized LoRa Protocol
173 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
174 * AT Commands to change parameters
175 * Remote configure parameters via LoRa Downlink
176 * Firmware upgradable via program port
177 * Counting
178
179
180
181 == 1.4  Applications ==
182
183 * Smart Buildings & Home Automation
184 * Logistics and Supply Chain Management
185 * Smart Metering
186 * Smart Agriculture
187 * Smart Cities
188 * Smart Factory
189
190
191
192 == 1.5 Hardware Variants ==
193
194 (% border="1" style="background-color:#f7faff; width:500px" %)
195 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
196 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
197 * 2 x Digital Input (Bi-direction)
198 * 2 x Digital Output
199 * 2 x Relay Output (5A@250VAC / 30VDC)
200 * 2 x 0~~20mA Analog Input (res:0.01mA)
201 * 2 x 0~~30V Analog Input (res:0.01v)
202 * 1 x Counting Port
203 )))
204
205
206
207 = 2. Power ON Device =
208
209 The LT controller can be powered by 7 ~~ 24V DC power source. Connect VIN to Power Input V+ and GND to power input V- to power the LT controller.
210
211 (((
212 PWR will on when device is properly powered.
213 )))
214
215 [[image:1653297104069-180.png]]
216
217
218
219 = 3. Operation Mode =
220
221 == 3.1 How it works? ==
222
223 (((
224 The LT is configured as LoRaWAN OTAA Class C mode by default. It has OTAA keys to join network. To connect a local LoRaWAN network, user just need to input the OTAA keys in the network server and power on the LT. It will auto join the network via OTAA. For LT-22222-L, the LED will show the Join status: After power on **TX LED** will fast blink 5 times, LT-22222-L will enter working mode and start to JOIN LoRaWAN network. **TX LED** will be on for 5 seconds after joined in network. When there is message from server, the **RX LED** will be on for 1 second. 
225 )))
226
227 (((
228 In case user can’t set the OTAA keys in the network server and has to use the existing keys from server. User can [[use AT Command>>||anchor="H4.UseATCommand"]] to set the keys in the devices.
229 )))
230
231
232 == 3.2 Example to join LoRaWAN network ==
233
234 (((
235 This chapter shows an example for how to join the TTN LoRaWAN Network. Below is the network structure, we use our LG308 as LoRaWAN gateway here. 
236 )))
237
238 [[image:image-20220523172350-1.png||height="266" width="864"]]
239
240
241 (((
242 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:
243 )))
244
245 (((
246 (% style="color:blue" %)**Step 1**(%%): Create a device in TTN with the OTAA keys from LT IO controller.
247 )))
248
249 (((
250 Each LT is shipped with a sticker with the default device EUI as below:
251 )))
252
253 [[image:1653297924498-393.png]]
254
255
256 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
257
258 Add APP EUI in the application.
259
260 [[image:1653297955910-247.png||height="321" width="716"]]
261
262
263 Add APP KEY and DEV EUI
264
265 [[image:1653298023685-319.png]]
266
267
268 (((
269 (% 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.
270 )))
271
272 [[image:1653298044601-602.png||height="405" width="709"]]
273
274
275
276 == 3.3 Uplink Payload ==
277
278 There are five working modes + one interrupt mode on LT for different type application:
279
280 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
281 * **MOD2**: Double DI Counting + DO + RO
282 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
283 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
284 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
285 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
286
287
288 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
289
290 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
291
292 [[image:image-20220523174024-3.png]]
293
294 (((
295
296
297 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
298 )))
299
300 [[image:image-20220523174254-4.png]]
301
302 * RO is for relay. ROx=1 : close，ROx=0 always open.
303 * DI is for digital input. DIx=1: high or float, DIx=0: low.
304 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
305
306 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
307
308 For example if payload is: [[image:image-20220523175847-2.png]]
309
310
311 **The value for the interface is:  **
312
313 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
314
315 AVI2 channel voltage is 0x04AC/1000=1.196V
316
317 ACI1 channel current is 0x1310/1000=4.880mA
318
319 ACI2 channel current is 0x1300/1000=4.864mA
320
321 The last byte 0xAA= 10101010(B) means
322
323 * [1] RO1 relay channel is close and the RO1 LED is ON.
324 * [0] RO2 relay channel is open and RO2 LED is OFF;
325
326 **LT22222-L:**
327
328 * [1] DI2 channel is high input and DI2 LED is ON;
329 * [0] DI1 channel is low input;
330
331 * [0] DO3 channel output state
332 ** DO3 is float in case no load between DO3 and V+.;
333 ** DO3 is high in case there is load between DO3 and V+.
334 ** DO3 LED is off in both case
335 * [1] DO2 channel output is low and DO2 LED is ON.
336 * [0] DO1 channel output state
337 ** DO1 is float in case no load between DO1 and V+.;
338 ** DO1 is high in case there is load between DO1 and V+.
339 ** DO1 LED is off in both case
340
341
342 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
343
344
345 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
346
347 (((
348 Total : 11 bytes payload
349 )))
350
351 [[image:image-20220523180452-3.png]]
352
353
354 (((
355 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
356 )))
357
358 [[image:image-20220523180506-4.png]]
359
360 * RO is for relay. ROx=1 : close，ROx=0 always open.
361 * FIRST: Indicate this is the first packet after join network.
362 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
363
364 (((
365 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
366 )))
367
368 (((
369
370
371 **To use counting mode, please run:**
372 )))
373
374 (% class="box infomessage" %)
375 (((
376 (((
377 **AT+MOD=2**
378 )))
379 )))
380
381 (% class="box infomessage" %)
382 (((
383 (((
384 **ATZ**
385 )))
386 )))
387
388 (((
389
390
391 (% style="color:#4f81bd" %)**AT Commands for counting:**
392 )))
393
394 (((
395 **For LT22222-L:**
396 )))
397
398 (% class="box infomessage" %)
399 (((
400 (((
401 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
402 )))
403 )))
404
405 (% class="box infomessage" %)
406 (((
407 (((
408 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
409 )))
410 )))
411
412 (% class="box infomessage" %)
413 (((
414 (((
415 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
416 )))
417 )))
418
419 (% class="box infomessage" %)
420 (((
421 (((
422 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
423 )))
424 )))
425
426 (% class="box infomessage" %)
427 (((
428 (((
429 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
430 )))
431 )))
432
433 (% class="box infomessage" %)
434 (((
435 (((
436 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
437 )))
438 )))
439
440
441
442 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
443
444 **LT22222-L**: This mode the DI1 is used as a counting pin.
445
446 [[image:image-20220523181246-5.png]]
447
448 (((
449 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
450 )))
451
452 [[image:image-20220523181301-6.png]]
453
454 * RO is for relay. ROx=1 : close，ROx=0 always open.
455 * FIRST: Indicate this is the first packet after join network.
456 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
457
458 (((
459 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
460 )))
461
462 (((
463 **To use counting mode, please run:**
464 )))
465
466 (% class="box infomessage" %)
467 (((
468 (((
469 **AT+MOD=3**
470 )))
471 )))
472
473 (% class="box infomessage" %)
474 (((
475 (((
476 **ATZ**
477 )))
478 )))
479
480 (((
481 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
482
483
484 )))
485
486
487 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
488
489
490 **LT22222-L**: This mode the DI1 is used as a counting pin.
491
492 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.
493
494 [[image:image-20220523181903-8.png]]
495
496
497 (((
498 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
499 )))
500
501 [[image:image-20220523181727-7.png]]
502
503 * RO is for relay. ROx=1 : close，ROx=0 always open.
504 * FIRST: Indicate this is the first packet after join network.
505 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
506
507 (((
508 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
509 )))
510
511 (((
512
513
514 **To use this mode, please run:**
515 )))
516
517 (% class="box infomessage" %)
518 (((
519 (((
520 **AT+MOD=4**
521 )))
522 )))
523
524 (% class="box infomessage" %)
525 (((
526 (((
527 **ATZ**
528 )))
529 )))
530
531 (((
532
533 )))
534
535 (((
536 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
537 )))
538
539 (((
540
541
542 **Plus below command for AVI1 Counting:**
543 )))
544
545 (% class="box infomessage" %)
546 (((
547 (((
548 **AT+SETCNT=3,60   (set AVI Count to 60)**
549 )))
550 )))
551
552 (% class="box infomessage" %)
553 (((
554 (((
555 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
556 )))
557 )))
558
559 (% class="box infomessage" %)
560 (((
561 (((
562 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
563 )))
564 )))
565
566 (% class="box infomessage" %)
567 (((
568 (((
569 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
570 )))
571 )))
572
573
574
575 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
576
577
578 **LT22222-L**: This mode the DI1 is used as a counting pin.
579
580 [[image:image-20220523182334-9.png]]
581
582 (((
583
584
585 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
586 )))
587
588 * RO is for relay. ROx=1 : close，ROx=0 always open.
589 * FIRST: Indicate this is the first packet after join network.
590 * (((
591 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
592 )))
593
594 (((
595 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
596 )))
597
598 (((
599
600
601 **To use this mode, please run:**
602 )))
603
604 (% class="box infomessage" %)
605 (((
606 (((
607 **AT+MOD=5**
608 )))
609 )))
610
611 (% class="box infomessage" %)
612 (((
613 (((
614 **ATZ**
615 )))
616 )))
617
618 (((
619 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
620 )))
621
622
623
624 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
625
626
627 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
628
629 For example, if user has configured below commands:
630
631 * **AT+MOD=1 ** **~-~->** The normal working mode
632 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
633
634 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
635
636 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
637 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.**
638
639 **AT Command to set Trigger Condition**:
640
641 (% style="color:#4f81bd" %)**Trigger base on voltage**:
642
643 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
644
645 **Example:**
646
647 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)
648
649 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
650
651
652
653 (% style="color:#4f81bd" %)**Trigger base on current**:
654
655 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
656
657 **Example:**
658
659 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
660
661
662
663 (% style="color:#4f81bd" %)**Trigger base on DI status**:
664
665 DI status trigger Flag.
666
667 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
668
669
670 **Example:**
671
672 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
673
674
675 **Downlink Command to set Trigger Condition:**
676
677 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
678
679 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
680
681 AA: Code for this downlink Command:
682
683 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
684
685 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
686
687 yy2 yy2: AC1 or AV1 high limit.
688
689 yy3 yy3: AC2 or AV2 low limit.
690
691 Yy4 yy4: AC2 or AV2 high limit.
692
693
694 **Example1**: AA 00 13 88 00 00 00 00 00 00
695
696 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
697
698
699 **Example2**: AA 02 01 00
700
701 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
702
703
704
705 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
706
707 MOD6 Payload : total 11 bytes payload
708
709 [[image:image-20220524085923-1.png]]
710
711
712 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
713
714 [[image:image-20220524090106-2.png]]
715
716 * Each bits shows if the corresponding trigger has been configured.
717
718 **Example:**
719
720 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
721
722
723 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
724
725 [[image:image-20220524090249-3.png]]
726
727 * Each bits shows which status has been trigger on this uplink.
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 **Example:**
741
742 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
743
744 00000101: Means both DI1 and DI2 trigger are enabled.
745
746
747 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
748
749 Downlink command to poll MOD6 status:
750
751 **AB 06**
752
753 When device got this command, it will send the MOD6 payload.
754
755
756
757 === 3.3.7 Payload Decoder ===
758
759 (((
760
761
762 **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/]]
763
764
765 )))
766
767
768
769 == 3.4 ​Configure LT via AT or Downlink ==
770
771 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
772
773 (((
774 There are two kinds of Commands:
775 )))
776
777 * (% 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]]
778
779 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
780
781 === 3.4.1 Common Commands ===
782
783 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]]
784
785
786
787 === 3.4.2 Sensor related commands ===
788
789 ==== 3.4.2.1 Set Transmit Interval ====
790
791 Set device uplink interval.
792
793 * AT Command:
794
795 (% class="box infomessage" %)
796 (((
797 **AT+TDC=N **
798 )))
799
800 **Example: **AT+TDC=30000. Means set interval to 30 seconds
801
802
803 * Downlink Payload (prefix 0x01):
804
805 (% class="box infomessage" %)
806 (((
807 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
808 )))
809
810
811
812 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
813
814 Set work mode.
815
816 * AT Command:
817
818 (% class="box infomessage" %)
819 (((
820 **AT+MOD=N  **
821 )))
822
823 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
824
825
826 * Downlink Payload (prefix 0x0A):
827
828 (% class="box infomessage" %)
829 (((
830 **0x0A aa     ~/~/ Same as AT+MOD=aa**
831 )))
832
833
834
835 ==== 3.4.2.3 Poll an uplink ====
836
837 * AT Command:
838
839 There is no AT Command to poll uplink
840
841
842 * Downlink Payload (prefix 0x08):
843
844 (% class="box infomessage" %)
845 (((
846 **0x08 FF     ~/~/ Poll an uplink,**
847 )))
848
849 **Example**: 0x08FF, ask device to send an Uplink
850
851
852
853 ==== 3.4.2.4 Enable Trigger Mode ====
854
855 Use of trigger mode, please check [[ADDMOD6>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
856
857 * AT Command:
858
859 (% class="box infomessage" %)
860 (((
861 **AT+ADDMOD6=1 or 0**
862 )))
863
864 1: Enable Trigger Mode
865
866 0: Disable Trigger Mode
867
868
869 * Downlink Payload (prefix 0x0A 06):
870
871 (% class="box infomessage" %)
872 (((
873 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
874 )))
875
876
877
878 ==== 3.4.2.5 Poll trigger settings ====
879
880 Poll trigger settings,
881
882 * AT Command:
883
884 There is no AT Command for this feature.
885
886
887 * Downlink Payload (prefix 0x AB 06):
888
889 (% class="box infomessage" %)
890 (((
891 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
892 )))
893
894
895
896 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
897
898 Enable Disable DI1/DI2/DI2 as trigger,
899
900 * AT Command:
901
902 (% class="box infomessage" %)
903 (((
904 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
905 )))
906
907
908 **Example:**
909
910 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
911
912 * Downlink Payload (prefix 0xAA 02):
913
914 (% class="box infomessage" %)
915 (((
916 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
917 )))
918
919
920
921 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
922
923 Set DI1 or DI3(for LT-33222-L) trigger.
924
925 * AT Command:
926
927 (% class="box infomessage" %)
928 (((
929 **AT+TRIG1=a,b**
930 )))
931
932 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
933
934 b : delay timing.
935
936
937 **Example:**
938
939 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
940
941
942 * Downlink Payload (prefix 0x09 01 ):
943
944 (% class="box infomessage" %)
945 (((
946 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
947 )))
948
949
950
951 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
952
953 Set DI2 trigger.
954
955 * AT Command:
956
957 (% class="box infomessage" %)
958 (((
959 **AT+TRIG2=a,b**
960 )))
961
962 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
963
964 b : delay timing.
965
966
967 **Example:**
968
969 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
970
971
972 * Downlink Payload (prefix 0x09 02 ):
973
974 (% class="box infomessage" %)
975 (((
976 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
977 )))
978
979
980
981 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
982
983 Set current trigger , base on AC port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
984
985 * AT Command:
986
987 (% class="box infomessage" %)
988 (((
989 **AT+ACLIM. **
990 )))
991
992
993 * Downlink Payload (prefix 0xAA 01 ):
994
995 (% class="box infomessage" %)
996 (((
997 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
998 )))
999
1000
1001
1002 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
1003
1004 Set current trigger , base on AV port. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]
1005
1006 * AT Command:
1007
1008 (% class="box infomessage" %)
1009 (((
1010 **AT+AVLIM. See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]]**
1011 )))
1012
1013
1014 * Downlink Payload (prefix 0xAA 00 ):
1015
1016 (% class="box infomessage" %)
1017 (((
1018 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>||anchor="H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29"]] **
1019 )))
1020
1021
1022
1023 ==== 3.4.2.11 Trigger – Set minimum interval ====
1024
1025 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
1026
1027 * AT Command:
1028
1029 (% class="box infomessage" %)
1030 (((
1031 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
1032 )))
1033
1034
1035 * Downlink Payload (prefix 0xAC ):
1036
1037 (% class="box infomessage" %)
1038 (((
1039 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
1040 )))
1041
1042
1043
1044 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
1045
1046 * AT Command:
1047
1048 There is no AT Command to control Digital Output
1049
1050
1051 * Downlink Payload (prefix 0x02):
1052
1053 (% class="box infomessage" %)
1054 (((
1055 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
1056 )))
1057
1058 (((
1059 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
1060 )))
1061
1062 (((
1063 01: Low,  00: High ,  11: No action
1064 )))
1065
1066 [[image:image-20220524092754-5.png]]
1067
1068 (((
1069 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
1070 )))
1071
1072 (((
1073 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
1074 )))
1075
1076
1077
1078 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
1079
1080 * AT Command:
1081
1082 There is no AT Command to control Digital Output
1083
1084
1085 * Downlink Payload (prefix 0xA9):
1086
1087 (% class="box infomessage" %)
1088 (((
1089 (((
1090 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1091 )))
1092 )))
1093
1094 This is to control the digital output time of DO pin. Include four bytes:
1095
1096 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1097
1098 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1099
1100 01: DO pins will change back to original state after timeout.
1101
1102 00: DO pins will change to an inverter state after timeout 
1103
1104
1105 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1106
1107 [[image:image-20220524093238-6.png]]
1108
1109
1110 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1111
1112 [[image:image-20220524093328-7.png]]
1113
1114
1115 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1116
1117 [[image:image-20220524093351-8.png]]
1118
1119
1120 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1121
1122 Latching time. Unit: ms
1123
1124 Device will upload a packet if downlink code executes successfully.
1125
1126
1127 **Example payload:**
1128
1129 **~1. A9 01 01 01 01 07 D0**
1130
1131 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1132
1133 **2. A9 01 00 01 11 07 D0**
1134
1135 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1136
1137 **3. A9 00 00 00 00 07 D0**
1138
1139 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1140
1141 **4. A9 00 11 01 00 07 D0**
1142
1143 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
1144
1145
1146
1147 ==== 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ====
1148
1149 * AT Command:
1150
1151 There is no AT Command to control Relay Output
1152
1153
1154 * Downlink Payload (prefix 0x03):
1155
1156 (% class="box infomessage" %)
1157 (((
1158 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1159 )))
1160
1161 (((
1162 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1163 )))
1164
1165 (((
1166 01: Close ,  00: Open , 11: No action
1167 )))
1168
1169 (((
1170 [[image:image-20220524093724-9.png]]
1171 )))
1172
1173 Device will upload a packet if downlink code executes successfully.
1174
1175
1176
1177 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1178
1179 * AT Command:
1180
1181 There is no AT Command to control Relay Output
1182
1183
1184 * Downlink Payload (prefix 0x05):
1185
1186 (% class="box infomessage" %)
1187 (((
1188 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1189 )))
1190
1191 This is to control the relay output time of relay. Include four bytes:
1192
1193 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1194
1195 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1196
1197 01: Relays will change back to original state after timeout.
1198
1199 00: Relays will change to an inverter state after timeout
1200
1201
1202 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1203
1204 [[image:image-20220524093831-10.png]]
1205
1206
1207 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1208
1209 Device will upload a packet if downlink code executes successfully.
1210
1211
1212 **Example payload:**
1213
1214 **~1. 05 01 11 07 D0**
1215
1216 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1217
1218 **2. 05 01 10 07 D0**
1219
1220 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1221
1222 **3. 05 00 01 07 D0**
1223
1224 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1225
1226 **4. 05 00 00 07 D0**
1227
1228 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1229
1230
1231
1232 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1233
1234 When voltage exceed the threshold, count. Feature see [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]
1235
1236 * AT Command:
1237
1238 (% class="box infomessage" %)
1239 (((
1240 **AT+VOLMAX    ~/~/ See [[MOD4>>||anchor="H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting"]]**
1241 )))
1242
1243
1244 * Downlink Payload (prefix 0xA5):
1245
1246 (% class="box infomessage" %)
1247 (((
1248 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1249 )))
1250
1251
1252
1253 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1254
1255 * AT Command:
1256
1257 (% class="box infomessage" %)
1258 (((
1259 **AT+SETCNT=aa,(bb cc dd ee) **
1260 )))
1261
1262 aa: 1: Set count1,
1263
1264 2: Set count2,
1265
1266 3: Set AV1 count
1267
1268 Bb cc dd ee: number to be set
1269
1270
1271 * Downlink Payload (prefix 0xA8):
1272
1273 (% class="box infomessage" %)
1274 (((
1275 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1276 )))
1277
1278
1279
1280 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1281
1282 Clear counting for counting mode
1283
1284 * AT Command:
1285
1286 (% class="box infomessage" %)
1287 (((
1288 **AT+CLRCOUNT ~/~/ clear all counting**
1289 )))
1290
1291 * Downlink Payload (prefix 0xA6):
1292
1293 (% class="box infomessage" %)
1294 (((
1295 **0x A6 01     ~/~/ clear all counting,**
1296 )))
1297
1298
1299
1300 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1301
1302 * AT Command:
1303
1304 (% class="box infomessage" %)
1305 (((
1306 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1307 )))
1308
1309 * Downlink Payload (prefix 0xA7):
1310
1311 (% class="box infomessage" %)
1312 (((
1313 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1314 )))
1315
1316 (((
1317 range: aa bb cc:0 to 16777215,  (unit:second)
1318
1319
1320 )))
1321
1322
1323 == 3.5 Integrate with Mydevice ==
1324
1325 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:
1326
1327 (((
1328 (% style="color:blue" %)**Step 1**(%%): Be sure that your device is programmed and properly connected to the network at this time.
1329 )))
1330
1331 (((
1332 (% 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:
1333 )))
1334
1335 [[image:1653356737703-362.png||height="232" width="732"]]
1336
1337 [[image:image-20220524094641-11.png||height="390" width="723"]]
1338
1339
1340 [[image:image-20220524094641-12.png||height="402" width="718"]]
1341
1342
1343 (% style="color:blue" %)**Step 3**(%%): Create an account or log in Mydevices.
1344
1345 (% style="color:blue" %)**Step 4**(%%): Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1346
1347 Search under The things network
1348
1349 [[image:1653356838789-523.png||height="337" width="740"]]
1350
1351
1352
1353 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1354
1355 [[image:image-20220524094909-1.png||height="335" width="729"]]
1356
1357
1358 [[image:image-20220524094909-2.png||height="337" width="729"]]
1359
1360
1361 [[image:image-20220524094909-3.png||height="338" width="727"]]
1362
1363
1364 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1365
1366
1367 [[image:image-20220524094909-5.png||height="341" width="734"]]
1368
1369
1370
1371 == 3.6 Interface Detail ==
1372
1373 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1374
1375 Support NPN Type sensor
1376
1377 [[image:1653356991268-289.png]]
1378
1379
1380
1381 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1382
1383 (((
1384 The DI port of LT-22222-L can support NPN or PNP output sensor.
1385 )))
1386
1387 (((
1388 (((
1389 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
1390 )))
1391 )))
1392
1393 [[image:1653357170703-587.png]]
1394
1395 (((
1396 (((
1397 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1398 )))
1399 )))
1400
1401 (((
1402
1403 )))
1404
1405 (((
1406 (% style="color:blue" %)**Example1**(%%): Connect to a Low active sensor.
1407 )))
1408
1409 (((
1410 This type of sensor will output a low signal GND when active.
1411 )))
1412
1413 * (((
1414 Connect sensor’s output to DI1-
1415 )))
1416 * (((
1417 Connect sensor’s VCC to DI1+.
1418 )))
1419
1420 (((
1421 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1422 )))
1423
1424 (((
1425 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1426 )))
1427
1428 (((
1429 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.
1430 )))
1431
1432 (((
1433
1434 )))
1435
1436 (((
1437 (% style="color:blue" %)**Example2**(%%): Connect to a High active sensor.
1438 )))
1439
1440 (((
1441 This type of sensor will output a high signal (example 24v) when active.
1442 )))
1443
1444 * (((
1445 Connect sensor’s output to DI1+
1446 )))
1447 * (((
1448 Connect sensor’s GND DI1-.
1449 )))
1450
1451 (((
1452 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1453 )))
1454
1455 (((
1456 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 1K.**
1457 )))
1458
1459 (((
1460 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.
1461 )))
1462
1463 (((
1464
1465 )))
1466
1467 (((
1468 (% style="color:blue" %)**Example3**(%%): Connect to a 220v high active sensor.
1469 )))
1470
1471 (((
1472 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1473 )))
1474
1475 * (((
1476 Connect sensor’s output to DI1+ with a serial 50K resistor
1477 )))
1478 * (((
1479 Connect sensor’s GND DI1-.
1480 )))
1481
1482 (((
1483 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1484 )))
1485
1486 (((
1487 [[image:1653968155772-850.png||height="23" width="19"]]**= DI1+ / 51K.**
1488 )))
1489
1490 (((
1491 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.
1492 )))
1493
1494
1495
1496 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1497
1498 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1499
1500 [[image:1653357531600-905.png]]
1501
1502
1503
1504 === 3.6.4 Analog Input Interface ===
1505
1506 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:
1507
1508
1509 (% style="color:blue" %)**AC2 = (IN2 voltage )/12**
1510
1511 [[image:1653357592296-182.png]]
1512
1513 Example to connect a 4~~20mA sensor
1514
1515 We take the wind speed sensor as an example for reference only.
1516
1517
1518 **Specifications of the wind speed sensor:**
1519
1520 Red:  12~~24v
1521
1522 Yellow:  4~~20mA
1523
1524 Black:  GND
1525
1526
1527 **Connection diagram:**
1528
1529 [[image:1653357640609-758.png]]
1530
1531 [[image:1653357648330-671.png||height="155" width="733"]]
1532
1533
1534
1535 === 3.6.5 Relay Output ===
1536
1537 (((
1538 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:
1539 )))
1540
1541 [[image:image-20220524100215-9.png]]
1542
1543 [[image:image-20220524100215-10.png||height="382" width="723"]]
1544
1545
1546
1547 == 3.7 LEDs Indicators ==
1548
1549 [[image:image-20220524100748-11.png]]
1550
1551
1552 = 4. Use AT Command =
1553
1554 == 4.1 Access AT Command ==
1555
1556 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.
1557
1558 [[image:1653358238933-385.png]]
1559
1560
1561 (((
1562 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:
1563 )))
1564
1565 [[image:1653358355238-883.png]]
1566
1567
1568 (((
1569 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/]]
1570 )))
1571
1572 (((
1573 AT+<CMD>?        : Help on <CMD>
1574 )))
1575
1576 (((
1577 AT+<CMD>         : Run <CMD>
1578 )))
1579
1580 (((
1581 AT+<CMD>=<value> : Set the value
1582 )))
1583
1584 (((
1585 AT+<CMD>=?       : Get the value
1586 )))
1587
1588 (((
1589 ATZ: Trig a reset of the MCU
1590 )))
1591
1592 (((
1593 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1594 )))
1595
1596 (((
1597 AT+DEUI: Get or Set the Device EUI
1598 )))
1599
1600 (((
1601 AT+DADDR: Get or Set the Device Address
1602 )))
1603
1604 (((
1605 AT+APPKEY: Get or Set the Application Key
1606 )))
1607
1608 (((
1609 AT+NWKSKEY: Get or Set the Network Session Key
1610 )))
1611
1612 (((
1613 AT+APPSKEY: Get or Set the Application Session Key
1614 )))
1615
1616 (((
1617 AT+APPEUI: Get or Set the Application EUI
1618 )))
1619
1620 (((
1621 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1622 )))
1623
1624 (((
1625 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1626 )))
1627
1628 (((
1629 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1630 )))
1631
1632 (((
1633 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1634 )))
1635
1636 (((
1637 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1638 )))
1639
1640 (((
1641 AT+RX2FQ: Get or Set the Rx2 window frequency
1642 )))
1643
1644 (((
1645 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1646 )))
1647
1648 (((
1649 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1650 )))
1651
1652 (((
1653 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1654 )))
1655
1656 (((
1657 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1658 )))
1659
1660 (((
1661 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1662 )))
1663
1664 (((
1665 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1666 )))
1667
1668 (((
1669 AT+NWKID: Get or Set the Network ID
1670 )))
1671
1672 (((
1673 AT+FCU: Get or Set the Frame Counter Uplink
1674 )))
1675
1676 (((
1677 AT+FCD: Get or Set the Frame Counter Downlink
1678 )))
1679
1680 (((
1681 AT+CLASS: Get or Set the Device Class
1682 )))
1683
1684 (((
1685 AT+JOIN: Join network
1686 )))
1687
1688 (((
1689 AT+NJS: Get OTAA Join Status
1690 )))
1691
1692 (((
1693 AT+SENDB: Send hexadecimal data along with the application port
1694 )))
1695
1696 (((
1697 AT+SEND: Send text data along with the application port
1698 )))
1699
1700 (((
1701 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1702 )))
1703
1704 (((
1705 AT+RECV: Print last received data in raw format
1706 )))
1707
1708 (((
1709 AT+VER: Get current image version and Frequency Band
1710 )))
1711
1712 (((
1713 AT+CFM: Get or Set the confirmation mode (0-1)
1714 )))
1715
1716 (((
1717 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1718 )))
1719
1720 (((
1721 AT+SNR: Get the SNR of the last received packet
1722 )))
1723
1724 (((
1725 AT+RSSI: Get the RSSI of the last received packet
1726 )))
1727
1728 (((
1729 AT+TDC: Get or set the application data transmission interval in ms
1730 )))
1731
1732 (((
1733 AT+PORT: Get or set the application port
1734 )))
1735
1736 (((
1737 AT+DISAT: Disable AT commands
1738 )))
1739
1740 (((
1741 AT+PWORD: Set password, max 9 digits
1742 )))
1743
1744 (((
1745 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1746 )))
1747
1748 (((
1749 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1750 )))
1751
1752 (((
1753 AT+CFG: Print all settings
1754
1755
1756 )))
1757
1758
1759
1760 == 4.2 Common AT Command Sequence ==
1761
1762 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1763
1764 (((
1765
1766
1767 **If device has not joined network yet:**
1768 )))
1769
1770 (((
1771 (% style="background-color:#dcdcdc" %)123456
1772 )))
1773
1774 (((
1775 (% style="background-color:#dcdcdc" %)AT+FDR
1776 )))
1777
1778 (((
1779 (% style="background-color:#dcdcdc" %)123456
1780 )))
1781
1782 (((
1783 (% style="background-color:#dcdcdc" %)AT+NJM=0
1784 )))
1785
1786 (((
1787 (% style="background-color:#dcdcdc" %)ATZ
1788 )))
1789
1790
1791 (((
1792 **If device already joined network:**
1793 )))
1794
1795 (((
1796 (% style="background-color:#dcdcdc" %)AT+NJM=0
1797 )))
1798
1799 (((
1800 (% style="background-color:#dcdcdc" %)ATZ
1801
1802
1803 )))
1804
1805
1806
1807 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1808
1809 (((
1810
1811
1812 (% style="background-color:#dcdcdc" %)123456(%%)  Enter Password to have AT access.
1813 )))
1814
1815 (((
1816 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1817 )))
1818
1819 (((
1820 (% style="background-color:#dcdcdc" %) 123456(%%)  Enter Password to have AT access.
1821 )))
1822
1823 (((
1824 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1825 )))
1826
1827 (((
1828 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%)  Set to ABP mode
1829 )))
1830
1831 (((
1832 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%)  Set the Adaptive Data Rate Off
1833 )))
1834
1835 (((
1836 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1837 )))
1838
1839 (((
1840 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1841 )))
1842
1843 (((
1844 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1845 )))
1846
1847 (((
1848 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%)  Set RX2Frequency to 868.4Mhz (according to the result from server)
1849 )))
1850
1851 (((
1852 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1853 )))
1854
1855 (((
1856 (% 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.
1857 )))
1858
1859 (((
1860 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1861
1862
1863 )))
1864
1865 (((
1866 (% style="color:red" %)**Note:**
1867 )))
1868
1869 (((
1870 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1871 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1872 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.
1873 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
1874 )))
1875
1876 (((
1877 [[image:1653359097980-169.png||height="188" width="729"]]
1878 )))
1879
1880 (((
1881
1882 )))
1883
1884
1885 === 4.2.3 Change to Class A ===
1886
1887 If sensor JOINED
1888 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1889 ATZ
1890
1891
1892 = 5. FAQ =
1893
1894 == 5.1 How to upgrade the image? ==
1895
1896
1897 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1898
1899 * Support new features
1900 * For bug fix
1901 * Change LoRaWAN bands.
1902
1903 Below shows the hardware connection for how to upload an image to the LT:
1904
1905 [[image:1653359603330-121.png]]
1906
1907
1908 (((
1909 (% 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]].
1910 (% 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/]].
1911 (% style="color:blue" %)**Step3**(%%)**:** Open flashloader; choose the correct COM port to update.
1912
1913
1914 (% style="color:blue" %)**For LT-22222-L**(%%):
1915 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.
1916 )))
1917
1918 [[image:image-20220524103407-12.png]]
1919
1920 [[image:image-20220524103429-13.png]]
1921
1922 [[image:image-20220524104033-15.png]]
1923
1924
1925 (% 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:
1926
1927 [[image:1653360054704-518.png||height="186" width="745"]]
1928
1929
1930 (((
1931 (((
1932
1933
1934 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1935 )))
1936 )))
1937
1938 (((
1939 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1940 )))
1941
1942 (((
1943
1944
1945 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1946 )))
1947
1948 (((
1949 (((
1950 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1951 )))
1952 )))
1953
1954 (((
1955 (((
1956 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1957
1958
1959 )))
1960 )))
1961
1962 (((
1963 (% 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.
1964 )))
1965
1966 (((
1967 [[image:1653360231087-571.png||height="401" width="727"]]
1968 )))
1969
1970 (((
1971 (% 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.
1972 )))
1973
1974
1975 (((
1976 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1977 )))
1978
1979 (((
1980 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1981 (% style="background-color:#dcdcdc" %)AT+FDR(%%)  Reset Parameters to Factory Default, Keys Reserve
1982 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1983 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%) Set to ABP mode
1984 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%) Set the Adaptive Data Rate Off
1985 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1986 (% style="background-color:#dcdcdc" %)AT+TDC=60000 (%%) Set transmit interval to 60 seconds
1987 (% style="background-color:#dcdcdc" %)AT+CHS=868400000(%%)  Set transmit frequency to 868.4Mhz
1988 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%)  Set Device Address to 26 01 1A F1
1989 (% style="background-color:#dcdcdc" %)ATZ        (%%) Reset MCU
1990 )))
1991
1992
1993 (((
1994 As shown in below:
1995 )))
1996
1997 [[image:1653360498588-932.png||height="485" width="726"]]
1998
1999
2000 == 5.4 Can I see counting event in Serial? ==
2001
2002 (((
2003 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.
2004
2005
2006 == 5.5 Can i use point to point communication for LT-22222-L? ==
2007
2008 Yes, please refer [[Point to Point Communication>>doc:Main. Point to Point Communication of LT-22222-L.WebHome]]
2009 )))
2010
2011 (((
2012
2013
2014 = 6. Trouble Shooting =
2015 )))
2016
2017 (((
2018 (((
2019 == 6.1 Downlink doesn’t work, how to solve it? ==
2020 )))
2021 )))
2022
2023 (((
2024 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
2025 )))
2026
2027 (((
2028
2029
2030 == 6.2 Have trouble to upload image. ==
2031 )))
2032
2033 (((
2034 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
2035 )))
2036
2037 (((
2038
2039
2040 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
2041 )))
2042
2043 (((
2044 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
2045 )))
2046
2047
2048
2049 = 7. Order Info =
2050
2051
2052 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
2053
2054
2055 (% style="color:#4f81bd" %)**XXX:**
2056
2057 * (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
2058 * (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
2059 * (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
2060 * (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
2061 * (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
2062 * (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
2063 * (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
2064 * (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
2065 * (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
2066
2067 = 8. Packing Info =
2068
2069
2070 **Package Includes**:
2071
2072 * LT-22222-L I/O Controller x 1
2073 * Stick Antenna for LoRa RF part x 1
2074 * Bracket for controller x1
2075 * Program cable x 1
2076
2077 **Dimension and weight**:
2078
2079 * Device Size: 13.5 x 7 x 3 cm
2080 * Device Weight: 105g
2081 * Package Size / pcs : 14.5 x 8 x 5 cm
2082 * Weight / pcs : 170g
2083
2084 = 9. Support =
2085
2086 * (((
2087 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.
2088 )))
2089 * (((
2090 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]]
2091 )))
2092
2093 = 10. Reference​​​​​ =
2094
2095 * 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]]
2096 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2097 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2098 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]

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