Version 74.1 by Xiaoling on 2022/05/31 11:36
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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 = 1.Introduction =
15
16 == 1.1 What is LT Series I/O Controller ==
17
18 (((
19 The Dragino LT series I/O Modules are Long Range LoRaWAN I/O Controller. It contains different I/O Interfaces such as: analog current Input, analog voltage input, relay output, digital input and digital output etc. The LT I/O Modules are designed to simplify the installation of I/O monitoring.
20 )))
21
22 (((
23 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.
24 )))
25
26 (((
27 The LT I/O Controllers is aiming to provide a simple plug and play, low cost installation by using LoRaWAN wireless technology.
28 )))
29
30 (((
31 The use environment includes:
32 )))
33
34 (((
35 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.
36 )))
37
38 (((
39 2) User can set up a LoRaWAN gateway locally and configure the controller to connect to the gateway via wireless.
40 )))
41
42 (((
43 [[image:1653295757274-912.png]]
44
45
46 )))
47
48 == 1.2  Specifications ==
49
50 (((
51 **Hardware System:**
52 )))
53
54 * (((
55 STM32L072CZT6 MCU
56 )))
57 * (((
58 SX1276/78 Wireless Chip 
59 )))
60 * (((
61 (((
62 Power Consumption:
63 )))
64
65 * (((
66 Idle: 4mA@12v
67 )))
68 * (((
69 20dB Transmit: 34mA@12v
70 )))
71 )))
72
73 (((
74 **Interface for Model: LT22222-L:**
75 )))
76
77 * (((
78 2 x Digital dual direction Input (Detect High/Low signal, Max: 50v, or 220v with optional external resistor)
79 )))
80 * (((
81 2 x Digital Output (NPN output. Max pull up voltage 36V,450mA)
82 )))
83 * (((
84 2 x Relay Output (5A@250VAC / 30VDC)
85 )))
86 * (((
87 2 x 0~~20mA Analog Input (res:0.01mA)
88 )))
89 * (((
90 2 x 0~~30V Analog Input (res:0.01v)
91 )))
92 * (((
93 Power Input 7~~ 24V DC. 
94 )))
95
96 (((
97 **LoRa Spec:**
98 )))
99
100 * (((
101 (((
102 Frequency Range:
103 )))
104
105 * (((
106 Band 1 (HF): 862 ~~ 1020 Mhz
107 )))
108 * (((
109 Band 2 (LF): 410 ~~ 528 Mhz
110 )))
111 )))
112 * (((
113 168 dB maximum link budget.
114 )))
115 * (((
116 +20 dBm - 100 mW constant RF output vs.
117 )))
118 * (((
119 +14 dBm high efficiency PA.
120 )))
121 * (((
122 Programmable bit rate up to 300 kbps.
123 )))
124 * (((
125 High sensitivity: down to -148 dBm.
126 )))
127 * (((
128 Bullet-proof front end: IIP3 = -12.5 dBm.
129 )))
130 * (((
131 Excellent blocking immunity.
132 )))
133 * (((
134 Low RX current of 10.3 mA, 200 nA register retention.
135 )))
136 * (((
137 Fully integrated synthesizer with a resolution of 61 Hz.
138 )))
139 * (((
140 FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation.
141 )))
142 * (((
143 Built-in bit synchronizer for clock recovery.
144 )))
145 * (((
146 Preamble detection.
147 )))
148 * (((
149 127 dB Dynamic Range RSSI.
150 )))
151 * (((
152 Automatic RF Sense and CAD with ultra-fast AFC.
153 )))
154 * (((
155 Packet engine up to 256 bytes with CRC.
156
157
158 )))
159
160 == 1.3 Features ==
161
162 * LoRaWAN Class A & Class C protocol
163 * Optional Customized LoRa Protocol
164 * Frequency Bands: CN470/EU433/KR920/US915/EU868/AS923/AU915/RU864/IN865
165 * AT Commands to change parameters
166 * Remote configure parameters via LoRa Downlink
167 * Firmware upgradable via program port
168 * Counting
169
170 == 1.4  Applications ==
171
172 * Smart Buildings & Home Automation
173 * Logistics and Supply Chain Management
174 * Smart Metering
175 * Smart Agriculture
176 * Smart Cities
177 * Smart Factory
178
179 == 1.5 Hardware Variants ==
180
181 (% border="1" style="background-color:#f7faff; width:500px" %)
182 |(% style="width:103px" %)**Model**|(% style="width:131px" %)**Photo**|(% style="width:334px" %)**Description**
183 |(% style="width:103px" %)**LT22222-L**|(% style="width:131px" %)[[image:1653296302983-697.png]]|(% style="width:334px" %)(((
184 * 2 x Digital Input (Bi-direction)
185 * 2 x Digital Output
186 * 2 x Relay Output (5A@250VAC / 30VDC)
187 * 2 x 0~~20mA Analog Input (res:0.01mA)
188 * 2 x 0~~30V Analog Input (res:0.01v)
189 * 1 x Counting Port
190 )))
191
192 = 2. Power ON Device =
193
194 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.
195
196 (((
197 PWR will on when device is properly powered.
198 )))
199
200 [[image:1653297104069-180.png]]
201
202
203 = 3. Operation Mode =
204
205 == 3.1 How it works? ==
206
207 (((
208 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. 
209 )))
210
211 (((
212 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.
213
214
215 )))
216
217 == 3.2 Example to join LoRaWAN network ==
218
219 (((
220 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. 
221 )))
222
223 [[image:image-20220523172350-1.png||height="266" width="864"]]
224
225 (((
226 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:
227 )))
228
229 (((
230 **Step 1**: Create a device in TTN with the OTAA keys from LT IO controller.
231 )))
232
233 (((
234 Each LT is shipped with a sticker with the default device EUI as below:
235 )))
236
237 [[image:1653297924498-393.png]]
238
239 Input these keys in the LoRaWAN Server portal. Below is TTN screen shot:
240
241 Add APP EUI in the application.
242
243 [[image:1653297955910-247.png||height="321" width="716"]]
244
245
246 Add APP KEY and DEV EUI
247
248 [[image:1653298023685-319.png]]
249
250
251 (((
252 **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.
253 )))
254
255 [[image:1653298044601-602.png||height="405" width="709"]]
256
257
258 == 3.3 Uplink Payload ==
259
260 There are five working modes + one interrupt mode on LT for different type application:
261
262 * **MOD1**: (default setting): 2 x ACI + 2AVI + DI + DO + RO
263 * **MOD2**: Double DI Counting + DO + RO
264 * **MOD3**: Single DI Counting + 2 x ACI + DO + RO
265 * **MOD4**: Single DI Counting + 1 x Voltage Counting + DO + RO
266 * **MOD5**: Single DI Counting + 2 x AVI + 1 x ACI + DO + RO
267 * **ADDMOD6**: Trigger Mode, Optional, used together with MOD1 ~~ MOD5
268
269 === 3.3.1 AT+MOD~=1, 2ACI+2AVI ===
270
271 The uplink payload includes totally 9 bytes. Uplink packets use FPORT=2 and every 10 minutes send one uplink by default.
272
273 [[image:image-20220523174024-3.png]]
274
275 (((
276 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
277 )))
278
279 [[image:image-20220523174254-4.png]]
280
281 * RO is for relay. ROx=1 : close，ROx=0 always open.
282 * DI is for digital input. DIx=1: high or float, DIx=0: low.
283 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
284
285 (% style="color:red" %)Note: DI3 and DO3 bit are not valid for LT-22222-L
286
287 For example if payload is: [[image:image-20220523175847-2.png]]
288
289 **The value for the interface is:  **
290
291 AVI1 channel voltage is 0x04AB/1000=1195（DEC）/1000=1.195V
292
293 AVI2 channel voltage is 0x04AC/1000=1.196V
294
295 ACI1 channel current is 0x1310/1000=4.880mA
296
297 ACI2 channel current is 0x1300/1000=4.864mA
298
299 The last byte 0xAA= 10101010(B) means
300
301 * [1] RO1 relay channel is close and the RO1 LED is ON.
302 * [0] RO2 relay channel is open and RO2 LED is OFF;
303
304 **LT22222-L:**
305
306 * [1] DI2 channel is high input and DI2 LED is ON;
307 * [0] DI1 channel is low input;
308
309 * [0] DO3 channel output state
310 ** DO3 is float in case no load between DO3 and V+.;
311 ** DO3 is high in case there is load between DO3 and V+.
312 ** DO3 LED is off in both case
313 * [1] DO2 channel output is low and DO2 LED is ON.
314 * [0] DO1 channel output state
315 ** DO1 is float in case no load between DO1 and V+.;
316 ** DO1 is high in case there is load between DO1 and V+.
317 ** DO1 LED is off in both case
318
319 === 3.3.2 AT+MOD~=2, (Double DI Counting) ===
320
321 **For LT-22222-L**: this mode the **DI1 and DI2** are used as counting pins.
322
323 (((
324 Total : 11 bytes payload
325 )))
326
327 [[image:image-20220523180452-3.png]]
328
329 (((
330 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DO3, DO2 and DO1. Totally 1bytes as below
331 )))
332
333 [[image:image-20220523180506-4.png]]
334
335 * RO is for relay. ROx=1 : close，ROx=0 always open.
336 * FIRST: Indicate this is the first packet after join network.
337 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
338
339 (((
340 (% style="color:red" %)Note: DO3 bit is not valid for LT-22222-L.
341 )))
342
343 (((
344 **To use counting mode, please run:**
345 )))
346
347 (% class="box infomessage" %)
348 (((
349 (((
350 **AT+MOD=2**
351 )))
352 )))
353
354 (% class="box infomessage" %)
355 (((
356 (((
357 **ATZ**
358 )))
359 )))
360
361 (((
362 (% style="color:#4f81bd" %)**AT Commands for counting:**
363 )))
364
365 (((
366 **For LT22222-L:**
367 )))
368
369 (% class="box infomessage" %)
370 (((
371 (((
372 **AT+TRIG1=0,100 (set DI1 port to trigger on low level, valid signal is 100ms) **
373 )))
374 )))
375
376 (% class="box infomessage" %)
377 (((
378 (((
379 **AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms ) **
380 )))
381 )))
382
383 (% class="box infomessage" %)
384 (((
385 (((
386 **AT+TRIG2=0,100 (set DI2 port to trigger on low level, valid signal is 100ms) **
387 )))
388 )))
389
390 (% class="box infomessage" %)
391 (((
392 (((
393 **AT+TRIG2=1,100 (set DI2 port to trigger on high level, valid signal is 100ms ) **
394 )))
395 )))
396
397 (% class="box infomessage" %)
398 (((
399 (((
400 **AT+SETCNT=1,60   (Set COUNT1 value to 60)**
401 )))
402 )))
403
404 (% class="box infomessage" %)
405 (((
406 (((
407 **AT+SETCNT=2,60   (Set COUNT2 value to 60)**
408 )))
409 )))
410
411
412 === 3.3.3 AT+MOD~=3, Single DI Counting + 2 x ACI ===
413
414 **LT22222-L**: This mode the DI1 is used as a counting pin.
415
416 [[image:image-20220523181246-5.png]]
417
418 (((
419 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
420 )))
421
422 [[image:image-20220523181301-6.png]]
423
424 * RO is for relay. ROx=1 : close，ROx=0 always open.
425 * FIRST: Indicate this is the first packet after join network.
426 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
427
428 (((
429 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
430 )))
431
432 (((
433 **To use counting mode, please run:**
434 )))
435
436 (% class="box infomessage" %)
437 (((
438 (((
439 **AT+MOD=3**
440 )))
441 )))
442
443 (% class="box infomessage" %)
444 (((
445 (((
446 **ATZ**
447 )))
448 )))
449
450 (((
451 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
452
453
454 )))
455
456 === 3.3.4 AT+MOD~=4, Single DI Counting + 1 x Voltage Counting ===
457
458 **LT22222-L**: This mode the DI1 is used as a counting pin.
459
460 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.
461
462 [[image:image-20220523181903-8.png]]
463
464 (((
465 (% style="color:#4f81bd" %)**DIDORO **(%%)is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
466 )))
467
468 [[image:image-20220523181727-7.png]]
469
470 * RO is for relay. ROx=1 : close，ROx=0 always open.
471 * FIRST: Indicate this is the first packet after join network.
472 * DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
473
474 (((
475 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
476 )))
477
478 (((
479 **To use this mode, please run:**
480 )))
481
482 (% class="box infomessage" %)
483 (((
484 (((
485 **AT+MOD=4**
486 )))
487 )))
488
489 (% class="box infomessage" %)
490 (((
491 (((
492 **ATZ**
493 )))
494 )))
495
496 (((
497
498 )))
499
500 (((
501 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
502 )))
503
504 (((
505 **Plus below command for AVI1 Counting:**
506 )))
507
508 (% class="box infomessage" %)
509 (((
510 (((
511 **AT+SETCNT=3,60   (set AVI Count to 60)**
512 )))
513 )))
514
515 (% class="box infomessage" %)
516 (((
517 (((
518 **AT+VOLMAX=20000   (If AVI1 voltage higher than VOLMAX (20000mV =20v), counter increase 1)**
519 )))
520 )))
521
522 (% class="box infomessage" %)
523 (((
524 (((
525 **AT+VOLMAX=20000,0   (If AVI1 voltage lower than VOLMAX (20000mV =20v), counter increase 1)**
526 )))
527 )))
528
529 (% class="box infomessage" %)
530 (((
531 (((
532 **AT+VOLMAX=20000,1   (If AVI1 voltage higer than VOLMAX (20000mV =20v), counter increase 1)**
533 )))
534 )))
535
536
537 === 3.3.5 AT+MOD~=5, Single DI Counting + 2 x AVI + 1 x ACI ===
538
539 **LT22222-L**: This mode the DI1 is used as a counting pin.
540
541 [[image:image-20220523182334-9.png]]
542
543 (((
544 (% style="color:#4f81bd" %)**DIDORO**(%%) is a combination for RO1, RO2, DI3, DI2, DI1, DO3, DO2 and DO1. Totally 1bytes as below
545 )))
546
547 * RO is for relay. ROx=1 : close，ROx=0 always open.
548 * FIRST: Indicate this is the first packet after join network.
549 * (((
550 DO is for reverse digital output. DOx=1: output low, DOx=0: high or float.
551 )))
552
553 (((
554 (% style="color:red" %)Note: DO3 is not valid for LT-22222-L.
555 )))
556
557 (((
558 **To use this mode, please run:**
559 )))
560
561 (% class="box infomessage" %)
562 (((
563 (((
564 **AT+MOD=5**
565 )))
566 )))
567
568 (% class="box infomessage" %)
569 (((
570 (((
571 **ATZ**
572 )))
573 )))
574
575 (((
576 Other AT Commands for counting are similar to [[MOD2 Counting Command>>||anchor="H3.3.2AT2BMOD3D22C28DoubleDICounting29"]].
577
578
579 )))
580
581 === 3.3.6 AT+ADDMOD~=6. (Trigger Mode, Optional) ===
582
583 (% style="color:#4f81bd" %)**This mode is an optional mode for trigger purpose. It can run together with other mode.**
584
585 For example, if user has configured below commands:
586
587 * **AT+MOD=1 ** **~-~->** The normal working mode
588 * **AT+ADDMOD6=1**   **~-~->** Enable trigger
589
590 LT will keep monitoring AV1/AV2/AC1/AC2 every 5 seconds; LT will send uplink packets in two cases:
591
592 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
593 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.**
594
595 **AT Command to set Trigger Condition**:
596
597 (% style="color:#4f81bd" %)**Trigger base on voltage**:
598
599 Format: AT+AVLIM=<AV1_LIMIT_LOW>,< AV1_LIMIT_HIGH>,<AV2_LIMIT_LOW>,< AV2_LIMIT_HIGH>
600
601 **Example:**
602
603 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)
604
605 AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
606
607 (% style="color:#4f81bd" %)**Trigger base on current**:
608
609 Format: AT+ACLIM=<AC1_LIMIT_LOW>,< AC1_LIMIT_HIGH>,<AC2_LIMIT_LOW>,< AC2_LIMIT_HIGH>
610
611 **Example:**
612
613 AT+ACLIM=10000,15000,0,0   (If ACI1 voltage lower than 10mA or higher than 15mA, trigger an uplink)
614
615 (% style="color:#4f81bd" %)**Trigger base on DI status**:
616
617 DI status trigger Flag.
618
619 Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >
620
621 **Example:**
622
623 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
624
625
626 **Downlink Command to set Trigger Condition**
627
628 Type Code: 0xAA. Downlink command same as AT Command **AT+AVLIM, AT+ACLIM**
629
630 Format: AA xx yy1 yy1 yy2 yy2 yy3 yy3 yy4 yy4
631
632 AA: Code for this downlink Command:
633
634 xx: 0: Limit for AV1 and AV2;  1: limit for AC1 and AC2 ; 2 DI1, DI2 trigger enable/disable
635
636 yy1 yy1: AC1 or AV1 low limit or DI1/DI2 trigger status.
637
638 yy2 yy2: AC1 or AV1 high limit.
639
640 yy3 yy3: AC2 or AV2 low limit.
641
642 Yy4 yy4: AC2 or AV2 high limit.
643
644 **Example1**: AA 00 13 88 00 00 00 00 00 00
645
646 Same as AT+AVLIM=5000,0,0,0   (If AVI1 voltage lower than 5V , trigger uplink, 0 means ignore)
647
648 **Example2**: AA 02 01 00
649
650 Same as AT+ DTRI =1,0  (Enable DI1 trigger / disable DI2 trigger)
651
652 (% style="color:#4f81bd" %)**Trigger Settings Payload Explanation:**
653
654 MOD6 Payload : total 11 bytes payload
655
656 [[image:image-20220524085923-1.png]]
657
658 (% style="color:#4f81bd" %)**TRI FLAG1**(%%) is a combination to show if trigger is set for this part. Totally 1byte as below
659
660 [[image:image-20220524090106-2.png]]
661
662 * Each bits shows if the corresponding trigger has been configured.
663
664 **Example:**
665
666 10100000: Means the system has configure to use the trigger: AC1_LOW and AV2_LOW
667
668
669 (% style="color:#4f81bd" %)**TRI Status1**(%%) is a combination to show which condition is trigger. Totally 1byte as below
670
671 [[image:image-20220524090249-3.png]]
672
673 * Each bits shows which status has been trigger on this uplink.
674
675 **Example:**
676
677 10000000: Means this packet is trigger by AC1_LOW. Means voltage too low.
678
679
680 (% style="color:#4f81bd" %)**TRI_DI FLAG+STA **(%%)is a combination to show which condition is trigger. Totally 1byte as below
681
682 [[image:image-20220524090456-4.png]]
683
684 * Each bits shows which status has been trigger on this uplink.
685
686 **Example:**
687
688 00000111: Means both DI1 and DI2 trigger are enabled and this packet is trigger by DI1.
689
690 00000101: Means both DI1 and DI2 trigger are enabled.
691
692
693 (% style="color:#4f81bd" %)**Enable/Disable MOD6 **(%%): 0x01: MOD6 is enable. 0x00: MOD6 is disable.
694
695 Downlink command to poll MOD6 status:
696
697 **AB 06**
698
699 When device got this command, it will send the MOD6 payload.
700
701
702 === 3.3.7 Payload Decoder ===
703
704 (((
705 **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/]]
706
707
708 )))
709
710 == 3.4 ​Configure LT via AT or Downlink ==
711
712 User can configure LT I/O Controller via AT Commands or LoRaWAN Downlink Commands
713
714 (((
715 There are two kinds of Commands:
716 )))
717
718 * (% 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: http:~/~/wiki.dragino.com/index.php?title=End_Device_AT_Commands_and_Downlink_Commands
719
720 * (% style="color:#4f81bd" %)**Sensor Related Commands**(%%): These commands are special designed for LT-22222-L.  User can see these commands below:
721
722 === 3.4.1 Common Commands ===
723
724 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]]
725
726
727 === 3.4.2 Sensor related commands ===
728
729 ==== 3.4.2.1 Set Transmit Interval ====
730
731 Set device uplink interval.
732
733 * AT Command:
734
735 (% class="box infomessage" %)
736 (((
737 **AT+TDC=N **
738 )))
739
740 **Example: **AT+TDC=30000. Means set interval to 30 seconds
741
742 * Downlink Payload (prefix 0x01):
743
744 (% class="box infomessage" %)
745 (((
746 **0x01 aa bb cc     ~/~/ Same as AT+TDC=0x(aa bb cc)**
747 )))
748
749
750 ==== 3.4.2.2 Set Work Mode (AT+MOD) ====
751
752 Set work mode.
753
754 * AT Command:
755
756 (% class="box infomessage" %)
757 (((
758 **AT+MOD=N  **
759 )))
760
761 **Example**: AT+MOD=2. Set work mode to Double DI counting mode
762
763 * Downlink Payload (prefix 0x0A):
764
765 (% class="box infomessage" %)
766 (((
767 **0x0A aa     ~/~/ Same as AT+MOD=aa**
768 )))
769
770
771 ==== 3.4.2.3 Poll an uplink ====
772
773 * AT Command:
774
775 There is no AT Command to poll uplink
776
777 * Downlink Payload (prefix 0x08):
778
779 (% class="box infomessage" %)
780 (((
781 **0x08 FF     ~/~/ Poll an uplink,**
782 )))
783
784 **Example**: 0x08FF, ask device to send an Uplink
785
786
787 ==== 3.4.2.4 Enable Trigger Mode ====
788
789 Use of trigger mode, please check [[ADDMOD6>>path:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]]
790
791 * AT Command:
792
793 (% class="box infomessage" %)
794 (((
795 **AT+ADDMOD6=1 or 0**
796 )))
797
798 1: Enable Trigger Mode
799
800 0: Disable Trigger Mode
801
802 * Downlink Payload (prefix 0x0A 06):
803
804 (% class="box infomessage" %)
805 (((
806 **0x0A 06 aa     ~/~/ Same as AT+ADDMOD6=aa,**
807 )))
808
809
810 ==== 3.4.2.5 Poll trigger settings ====
811
812 Poll trigger settings,
813
814 * AT Command:
815
816 There is no AT Command for this feature.
817
818 * Downlink Payload (prefix 0x AB 06):
819
820 (% class="box infomessage" %)
821 (((
822 **0xAB 06  ~/~/ Poll trigger settings, device will uplink trigger settings once receive this command**
823 )))
824
825
826 ==== 3.4.2.6 Enable / Disable DI1/DI2/DI3 as trigger ====
827
828 Enable Disable DI1/DI2/DI2 as trigger,
829
830 * AT Command:
831
832 (% class="box infomessage" %)
833 (((
834 **Format: AT+DTRI=<DI1_TIRGGER_FlAG>,< DI2_TIRGGER_FlAG >**
835 )))
836
837 **Example:**
838
839 AT+ DTRI =1,0   (Enable DI1 trigger / disable DI2 trigger)
840
841 * Downlink Payload (prefix 0xAA 02):
842
843 (% class="box infomessage" %)
844 (((
845 **0xAA 02 aa bb  ~/~/ Same as AT+DTRI=aa,bb**
846 )))
847
848
849 ==== 3.4.2.7 Trigger1 – Set DI1 or DI3 as trigger ====
850
851 Set DI1 or DI3(for LT-33222-L) trigger.
852
853 * AT Command:
854
855 (% class="box infomessage" %)
856 (((
857 **AT+TRIG1=a,b**
858 )))
859
860 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
861
862 b : delay timing.
863
864 **Example:**
865
866 AT+TRIG1=1,100(set DI1 port to trigger on high level, valid signal is 100ms )
867
868 * Downlink Payload (prefix 0x09 01 ):
869
870 (% class="box infomessage" %)
871 (((
872 **0x09 01 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
873 )))
874
875
876 ==== 3.4.2.8 Trigger2 – Set DI2 as trigger ====
877
878 Set DI2 trigger.
879
880 * AT Command:
881
882 (% class="box infomessage" %)
883 (((
884 **AT+TRIG2=a,b**
885 )))
886
887 a : Interrupt mode. 0: falling edge; 1: rising edge, 2: falling and raising edge(for MOD=1).
888
889 b : delay timing.
890
891 **Example:**
892
893 AT+TRIG2=0,100(set DI1 port to trigger on low level, valid signal is 100ms )
894
895 * Downlink Payload (prefix 0x09 02 ):
896
897 (% class="box infomessage" %)
898 (((
899 **0x09 02 aa bb cc ~/~/ same as AT+TRIG1=aa,0x(bb cc)**
900 )))
901
902
903 ==== 3.4.2.9 Trigger – Set AC (current) as trigger ====
904
905 Set current trigger , base on AC port. See [[trigger mode>>path:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]]
906
907 * AT Command:
908
909 (% class="box infomessage" %)
910 (((
911 **AT+ACLIM. **
912 )))
913
914 * Downlink Payload (prefix 0xAA 01 ):
915
916 (% class="box infomessage" %)
917 (((
918 **0x AA 01 aa bb cc dd ee ff gg hh ~/~/ same as AT+ACLIM See [[trigger mode>>url:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]]**
919 )))
920
921
922 ==== 3.4.2.10 Trigger – Set AV (voltage) as trigger ====
923
924 Set current trigger , base on AV port. See [[trigger mode>>url:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]]
925
926 * AT Command:
927
928 (% class="box infomessage" %)
929 (((
930 **AT+AVLIM. See [[trigger mode>>url:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]]**
931 )))
932
933 * Downlink Payload (prefix 0xAA 00 ):
934
935 (% class="box infomessage" %)
936 (((
937 **0x AA 00 aa bb cc dd ee ff gg hh ~/~/ same as AT+AVLIM See [[trigger mode>>url:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.6AT2BADDMOD3D6.28TriggerMode2COptional29]] **
938 )))
939
940
941 ==== 3.4.2.11 Trigger – Set minimum interval ====
942
943 Set AV and AC trigger minimum interval, system won’t response to the second trigger within this set time after the first trigger.
944
945 * AT Command:
946
947 (% class="box infomessage" %)
948 (((
949 **AT+ATDC=5. Device won’t response the second trigger within 5 minute after the first trigger.**
950 )))
951
952 * Downlink Payload (prefix 0xAC ):
953
954 (% class="box infomessage" %)
955 (((
956 **0x AC aa bb ~/~/ same as AT+ATDC=0x(aa bb)   . Unit (min)**
957 )))
958
959
960 ==== 3.4.2.12 DO ~-~- Control Digital Output DO1/DO2/DO3 ====
961
962 * AT Command:
963
964 There is no AT Command to control Digital Output
965
966 * Downlink Payload (prefix 0x02):
967
968 (% class="box infomessage" %)
969 (((
970 **0x02 aa bb cc     ~/~/ Set DO1/DO2/DO3 output**
971 )))
972
973 (((
974 If payload = 0x02010001, while there is load between V+ and DOx, it means set DO1 to low, DO2 to high and DO3 to low.
975 )))
976
977 (((
978 01: Low,  00: High ,  11: No action
979 )))
980
981 [[image:image-20220524092754-5.png]]
982
983 (((
984 (% style="color:red" %)Note: For LT-22222-L, there is no DO3, the last byte can use any value.
985 )))
986
987 (((
988 (% style="color:red" %)Device will upload a packet if downlink code executes successfully.
989 )))
990
991
992 ==== 3.4.2.13 DO ~-~- Control Digital Output DO1/DO2/DO3 with time control ====
993
994 * AT Command:
995
996 There is no AT Command to control Digital Output
997
998 * Downlink Payload (prefix 0xA9):
999
1000 (% class="box infomessage" %)
1001 (((
1002 (((
1003 **0xA9 aa bb cc     ~/~/ Set DO1/DO2/DO3 output with time control**
1004 )))
1005 )))
1006
1007 This is to control the digital output time of DO pin. Include four bytes:
1008
1009 (% style="color:#4f81bd" %)**First Byte**(%%)**:** Type code (0xA9)
1010
1011 (% style="color:#4f81bd" %)**Second Byte**(%%): Inverter Mode
1012
1013 01: DO pins will change back to original state after timeout.
1014
1015 00: DO pins will change to an inverter state after timeout 
1016
1017 (% style="color:#4f81bd" %)**Third Byte**(%%): Control Method and Ports status:
1018
1019 [[image:image-20220524093238-6.png]]
1020
1021 (% style="color:#4f81bd" %)**Fourth Byte**(%%): Control Method and Ports status:
1022
1023 [[image:image-20220524093328-7.png]]
1024
1025 (% style="color:#4f81bd" %)**Fifth Byte**(%%): Control Method and Ports status:
1026
1027 [[image:image-20220524093351-8.png]]
1028
1029 (% style="color:#4f81bd" %)**Sixth and Seventh Byte**:
1030
1031 Latching time. Unit: ms
1032
1033 Device will upload a packet if downlink code executes successfully.
1034
1035 **Example payload:**
1036
1037 **~1. A9 01 01 01 01 07 D0**
1038
1039 DO1 pin & DO2 pin & DO3 pin will be set to Low, last 2 seconds, then change back to original state.
1040
1041 **2. A9 01 00 01 11 07 D0**
1042
1043 DO1 pin set high, DO2 pin set low, DO3 pin no action, last 2 seconds, then change back to original state.
1044
1045 **3. A9 00 00 00 00 07 D0**
1046
1047 DO1 pin & DO2 pin & DO3 pin will be set to high, last 2 seconds, then both change to low.
1048
1049 **4. A9 00 11 01 00 07 D0**
1050
1051 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
1052
1053
1054 === 3.4.2.14 Relay ~-~- Control Relay Output RO1/RO2 ===
1055
1056 * AT Command:
1057
1058 There is no AT Command to control Relay Output
1059
1060 * Downlink Payload (prefix 0x03):
1061
1062 (% class="box infomessage" %)
1063 (((
1064 **0x03 aa bb     ~/~/ Set RO1/RO2 output**
1065 )))
1066
1067 (((
1068 If payload = 0x030100, it means set RO1 to close and RO2 to open.
1069 )))
1070
1071 (((
1072 01: Close ,  00: Open , 11: No action
1073 )))
1074
1075 (((
1076 [[image:image-20220524093724-9.png]]
1077 )))
1078
1079 Device will upload a packet if downlink code executes successfully.
1080
1081
1082 ==== 3.4.2.15 Relay ~-~- Control Relay Output RO1/RO2 with time control ====
1083
1084 * AT Command:
1085
1086 There is no AT Command to control Relay Output
1087
1088 * Downlink Payload (prefix 0x05):
1089
1090 (% class="box infomessage" %)
1091 (((
1092 **0x05 aa bb cc dd     ~/~/ Set RO1/RO2 relay with time control:**
1093 )))
1094
1095 This is to control the relay output time of relay. Include four bytes:
1096
1097 (% style="color:#4f81bd" %)**First Byte **(%%)**:** Type code (0x05)
1098
1099 (% style="color:#4f81bd" %)**Second Byte(aa)**(%%): Inverter Mode
1100
1101 01: Relays will change back to original state after timeout.
1102
1103 00: Relays will change to an inverter state after timeout
1104
1105 (% style="color:#4f81bd" %)**Third Byte(bb)**(%%): Control Method and Ports status:
1106
1107 [[image:image-20220524093831-10.png]]
1108
1109 (% style="color:#4f81bd" %)**Fourth/Fifth Bytes(cc)**(%%): Latching time. Unit: ms
1110
1111 Device will upload a packet if downlink code executes successfully.
1112
1113 **Example payload:**
1114
1115 **~1. 05 01 11 07 D0**
1116
1117 Relay1 and Relay 2 will be set to NO , last 2 seconds, then change back to original state.
1118
1119 **2. 05 01 10 07 D0**
1120
1121 Relay1 will change to NO, Relay2 will change to NC, last 2 seconds, then both change back to original state.
1122
1123 **3. 05 00 01 07 D0**
1124
1125 Relay1 will change to NC, Relay2 will change to NO, last 2 seconds, then relay change to NO, Relay2 change to NC.
1126
1127 **4. 05 00 00 07 D0**
1128
1129 Relay 1 & relay2 will change to NC, last 2 seconds, then both change to NO.
1130
1131
1132 ==== 3.4.2.16 Counting ~-~- Voltage threshold counting ====
1133
1134 When voltage exceed the threshold, count. Feature see [[MOD4>>path:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting]]
1135
1136 * AT Command:
1137
1138 (% class="box infomessage" %)
1139 (((
1140 **AT+VOLMAX    ~/~/ See [[MOD4>>path:http://8.211.40.43:8080/xwiki/bin/view/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/#H3.3.4AT2BMOD3D42CSingleDICounting2B1xVoltageCounting]]**
1141 )))
1142
1143 * Downlink Payload (prefix 0xA5):
1144
1145 (% class="box infomessage" %)
1146 (((
1147 **0xA5 aa bb cc   ~/~/ Same as AT+VOLMAX=(aa bb),cc**
1148 )))
1149
1150
1151 ==== 3.4.2.17 Counting ~-~- Pre-configure the Count Number ====
1152
1153 * AT Command:
1154
1155 (% class="box infomessage" %)
1156 (((
1157 **AT+SETCNT=aa,(bb cc dd ee) **
1158 )))
1159
1160 aa: 1: Set count1,
1161
1162 2: Set count2,
1163
1164 3: Set AV1 count
1165
1166 Bb cc dd ee: number to be set
1167
1168 * Downlink Payload (prefix 0xA8):
1169
1170 (% class="box infomessage" %)
1171 (((
1172 **0x A8 aa bb cc dd ee     ~/~/ same as AT+SETCNT=aa,(bb cc dd ee)**
1173 )))
1174
1175
1176 ==== 3.4.2.18 Counting ~-~- Clear Counting ====
1177
1178 Clear counting for counting mode
1179
1180 * AT Command:
1181
1182 (% class="box infomessage" %)
1183 (((
1184 **AT+CLRCOUNT ~/~/ clear all counting**
1185 )))
1186
1187 * Downlink Payload (prefix 0xA6):
1188
1189 (% class="box infomessage" %)
1190 (((
1191 **0x A6 01     ~/~/ clear all counting,**
1192 )))
1193
1194
1195 ==== 3.4.2.19 Counting ~-~- Change counting mode save time ====
1196
1197 * AT Command:
1198
1199 (% class="box infomessage" %)
1200 (((
1201 **AT+COUTIME=60  ~/~/ Set save time to 60 seconds. Device will save the counting result in internal flash every 60 seconds. (min value: 30)**
1202 )))
1203
1204 * Downlink Payload (prefix 0xA7):
1205
1206 (% class="box infomessage" %)
1207 (((
1208 **0x A7 aa bb cc     ~/~/ same as AT+COUTIME =aa bb cc,**
1209 )))
1210
1211 (((
1212 range: aa bb cc:0 to 16777215,  (unit:second)
1213
1214
1215 )))
1216
1217 == 3.5 Integrate with Mydevice ==
1218
1219 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:
1220
1221 (((
1222 **Step 1**: Be sure that your device is programmed and properly connected to the network at this time.
1223 )))
1224
1225 (((
1226 **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:
1227 )))
1228
1229 [[image:1653356737703-362.png||height="232" width="732"]]
1230
1231 [[image:image-20220524094641-11.png||height="390" width="723"]]
1232
1233 [[image:image-20220524094641-12.png||height="402" width="718"]]
1234
1235 **Step 3**: Create an account or log in Mydevices.
1236
1237 **Step 4**: Search LT-22222-L(for both LT-22222-L / LT-33222-L) and add DevEUI.(% style="display:none" %)
1238
1239 Search under The things network
1240
1241 [[image:1653356838789-523.png||height="337" width="740"]]
1242
1243
1244 After added, the sensor data arrive TTN, it will also arrive and show in Mydevices.
1245
1246 [[image:image-20220524094909-1.png||height="335" width="729"]]
1247
1248 [[image:image-20220524094909-2.png||height="337" width="729"]]
1249
1250 [[image:image-20220524094909-3.png||height="338" width="727"]]
1251
1252 [[image:image-20220524094909-4.png||height="339" width="728"]](% style="display:none" %)
1253
1254 [[image:image-20220524094909-5.png||height="341" width="734"]]
1255
1256
1257 == 3.6 Interface Detail ==
1258
1259 === 3.6.1 Digital Input Port: DI1/DI2 /DI3 ( For LT-33222-L, low active ) ===
1260
1261 Support NPN Type sensor
1262
1263 [[image:1653356991268-289.png]]
1264
1265
1266 === 3.6.2 Digital Input Port: DI1/DI2 ( For LT-22222-L) ===
1267
1268 (((
1269 The DI port of LT-22222-L can support NPN or PNP output sensor.
1270 )))
1271
1272 (((
1273 (((
1274 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
1275 )))
1276 )))
1277
1278 [[image:1653357170703-587.png]]
1279
1280 (((
1281 (((
1282 When use need to connect a device to the DI port, both DI1+ and DI1- must be connected.
1283 )))
1284 )))
1285
1286 (((
1287
1288 )))
1289
1290 (((
1291 **Example1**: Connect to a Low active sensor.
1292 )))
1293
1294 (((
1295 This type of sensor will output a low signal GND when active.
1296 )))
1297
1298 * (((
1299 Connect sensor’s output to DI1-
1300 )))
1301 * (((
1302 Connect sensor’s VCC to DI1+.
1303 )))
1304
1305 (((
1306 So when sensor active, the current between NEC2501 pin1 and pin2 is：
1307 )))
1308
1309 (((
1310 [[image:/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/WebHome/image-20220524095628-8.png?rev=1.1||alt="image-20220524095628-8.png"]]**[[image:image-20220524095628-8.png]]= DI1+ / 1K.**
1311 )))
1312
1313 (((
1314 If DI1+ = 12v, the //IF// = 12mA , So the LT-22222-L will be able to detect this active signal.
1315 )))
1316
1317 (((
1318
1319 )))
1320
1321 (((
1322 **Example2**: Connect to a High active sensor.
1323 )))
1324
1325 (((
1326 This type of sensor will output a high signal (example 24v) when active.
1327 )))
1328
1329 * (((
1330 Connect sensor’s output to DI1+
1331 )))
1332 * (((
1333 Connect sensor’s GND DI1-.
1334 )))
1335
1336 (((
1337 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1338 )))
1339
1340 (((
1341 [[image:/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/WebHome/image-20220524095628-8.png?rev=1.1||alt="image-20220524095628-8.png"]]**[[image:image-20220524095628-8.png]]= DI1+ / 1K.**
1342 )))
1343
1344 (((
1345 If **DI1+ = 24v**, the[[image:/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/WebHome/image-20220524095628-8.png?rev=1.1||alt="image-20220524095628-8.png"]]**[[image:image-20220524095628-8.png]]**= 24mA , So the LT-22222-L will be able to detect this high active signal.
1346 )))
1347
1348 (((
1349
1350 )))
1351
1352 (((
1353 **Example3**: Connect to a 220v high active sensor.
1354 )))
1355
1356 (((
1357 Assume user want to monitor an active signal higher than 220v, to make sure not burn the photocoupler  
1358 )))
1359
1360 * (((
1361 Connect sensor’s output to DI1+ with a serial 50K resistor
1362 )))
1363 * (((
1364 Connect sensor’s GND DI1-.
1365 )))
1366
1367 (((
1368 So when sensor active, the current between NEC2501 pin1 and pin2 is:
1369 )))
1370
1371 (((
1372 [[image:/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/WebHome/image-20220524095628-8.png?rev=1.1||alt="image-20220524095628-8.png"]][[image:/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LT-22222-L/WebHome/image-20220524095628-8.png?rev=1.1||alt="image-20220524095628-8.png"]]**[[image:image-20220524095628-8.png]]= DI1+ / 51K.**
1373 )))
1374
1375 (((
1376 If sensor output is 220v, the (% 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.
1377 )))
1378
1379
1380 === 3.6.3 Digital Output Port: DO1/DO2 /DO3 ===
1381
1382 NPN output: GND or Float. Max voltage can apply to output pin is 36v.
1383
1384 [[image:1653357531600-905.png]]
1385
1386
1387 === 3.6.4 Analog Input Interface ===
1388
1389 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:
1390
1391 **AC2 = (IN2 voltage )/12**
1392
1393 [[image:1653357592296-182.png]]
1394
1395 Example to connect a 4~~20mA sensor
1396
1397 We take the wind speed sensor as an example for reference only.
1398
1399 Specifications of the wind speed sensor:
1400
1401 Red:12~~24v
1402
1403 Yellow:4~~20mA
1404
1405 Black:GND
1406
1407
1408 Connection diagram:
1409
1410 [[image:1653357640609-758.png]]
1411
1412 [[image:1653357648330-671.png||height="155" width="733"]]
1413
1414
1415 === 3.6.5 Relay Output ===
1416
1417 (((
1418 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:
1419 )))
1420
1421 [[image:image-20220524100215-9.png]]
1422
1423 [[image:image-20220524100215-10.png||height="382" width="723"]]
1424
1425
1426 == 3.7 LEDs Indicators ==
1427
1428 [[image:image-20220524100748-11.png]]
1429
1430
1431 = 4. Use AT Command =
1432
1433 == 4.1 Access AT Command ==
1434
1435 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.
1436
1437 [[image:1653358238933-385.png]]
1438
1439 (((
1440 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:
1441 )))
1442
1443 [[image:1653358355238-883.png]]
1444
1445 (((
1446 More detail AT Command manual can be found at [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
1447 )))
1448
1449 (((
1450 AT+<CMD>?        : Help on <CMD>
1451 )))
1452
1453 (((
1454 AT+<CMD>         : Run <CMD>
1455 )))
1456
1457 (((
1458 AT+<CMD>=<value> : Set the value
1459 )))
1460
1461 (((
1462 AT+<CMD>=?       : Get the value
1463 )))
1464
1465 (((
1466 ATZ: Trig a reset of the MCU
1467 )))
1468
1469 (((
1470 AT+FDR: Reset Parameters to Factory Default, Keys Reserve 
1471 )))
1472
1473 (((
1474 AT+DEUI: Get or Set the Device EUI
1475 )))
1476
1477 (((
1478 AT+DADDR: Get or Set the Device Address
1479 )))
1480
1481 (((
1482 AT+APPKEY: Get or Set the Application Key
1483 )))
1484
1485 (((
1486 AT+NWKSKEY: Get or Set the Network Session Key
1487 )))
1488
1489 (((
1490 AT+APPSKEY: Get or Set the Application Session Key
1491 )))
1492
1493 (((
1494 AT+APPEUI: Get or Set the Application EUI
1495 )))
1496
1497 (((
1498 AT+ADR: Get or Set the Adaptive Data Rate setting. (0: off, 1: on)
1499 )))
1500
1501 (((
1502 AT+TXP: Get or Set the Transmit Power (0-5, MAX:0, MIN:5, according to LoRaWAN Spec)
1503 )))
1504
1505 (((
1506 AT+DR: Get or Set the Data Rate. (0-7 corresponding to DR_X)  
1507 )))
1508
1509 (((
1510 AT+DCS: Get or Set the ETSI Duty Cycle setting - 0=disable, 1=enable - Only for testing
1511 )))
1512
1513 (((
1514 AT+PNM: Get or Set the public network mode. (0: off, 1: on)
1515 )))
1516
1517 (((
1518 AT+RX2FQ: Get or Set the Rx2 window frequency
1519 )))
1520
1521 (((
1522 AT+RX2DR: Get or Set the Rx2 window data rate (0-7 corresponding to DR_X)
1523 )))
1524
1525 (((
1526 AT+RX1DL: Get or Set the delay between the end of the Tx and the Rx Window 1 in ms
1527 )))
1528
1529 (((
1530 AT+RX2DL: Get or Set the delay between the end of the Tx and the Rx Window 2 in ms
1531 )))
1532
1533 (((
1534 AT+JN1DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 1 in ms
1535 )))
1536
1537 (((
1538 AT+JN2DL: Get or Set the Join Accept Delay between the end of the Tx and the Join Rx Window 2 in ms
1539 )))
1540
1541 (((
1542 AT+NJM: Get or Set the Network Join Mode. (0: ABP, 1: OTAA)
1543 )))
1544
1545 (((
1546 AT+NWKID: Get or Set the Network ID
1547 )))
1548
1549 (((
1550 AT+FCU: Get or Set the Frame Counter Uplink
1551 )))
1552
1553 (((
1554 AT+FCD: Get or Set the Frame Counter Downlink
1555 )))
1556
1557 (((
1558 AT+CLASS: Get or Set the Device Class
1559 )))
1560
1561 (((
1562 AT+JOIN: Join network
1563 )))
1564
1565 (((
1566 AT+NJS: Get OTAA Join Status
1567 )))
1568
1569 (((
1570 AT+SENDB: Send hexadecimal data along with the application port
1571 )))
1572
1573 (((
1574 AT+SEND: Send text data along with the application port
1575 )))
1576
1577 (((
1578 AT+RECVB: Print last received data in binary format (with hexadecimal values)
1579 )))
1580
1581 (((
1582 AT+RECV: Print last received data in raw format
1583 )))
1584
1585 (((
1586 AT+VER: Get current image version and Frequency Band
1587 )))
1588
1589 (((
1590 AT+CFM: Get or Set the confirmation mode (0-1)
1591 )))
1592
1593 (((
1594 AT+CFS: Get confirmation status of the last AT+SEND (0-1)
1595 )))
1596
1597 (((
1598 AT+SNR: Get the SNR of the last received packet
1599 )))
1600
1601 (((
1602 AT+RSSI: Get the RSSI of the last received packet
1603 )))
1604
1605 (((
1606 AT+TDC: Get or set the application data transmission interval in ms
1607 )))
1608
1609 (((
1610 AT+PORT: Get or set the application port
1611 )))
1612
1613 (((
1614 AT+DISAT: Disable AT commands
1615 )))
1616
1617 (((
1618 AT+PWORD: Set password, max 9 digits
1619 )))
1620
1621 (((
1622 AT+CHS: Get or Set Frequency (Unit: Hz) for Single Channel Mode
1623 )))
1624
1625 (((
1626 AT+CHE: Get or Set eight channels mode, Only for US915, AU915, CN470
1627 )))
1628
1629 (((
1630 AT+CFG: Print all settings
1631
1632
1633 )))
1634
1635 == 4.2 Common AT Command Sequence ==
1636
1637 === 4.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
1638
1639 (((
1640 If device has not joined network yet:
1641 )))
1642
1643 (((
1644 (% style="background-color:#dcdcdc" %)123456
1645 )))
1646
1647 (((
1648 (% style="background-color:#dcdcdc" %)AT+FDR
1649 )))
1650
1651 (((
1652 (% style="background-color:#dcdcdc" %)123456
1653 )))
1654
1655 (((
1656 (% style="background-color:#dcdcdc" %)AT+NJM=0
1657 )))
1658
1659 (((
1660 (% style="background-color:#dcdcdc" %)ATZ
1661 )))
1662
1663
1664 (((
1665 If device already joined network:
1666 )))
1667
1668 (((
1669 (% style="background-color:#dcdcdc" %)AT+NJM=0
1670 )))
1671
1672 (((
1673 (% style="background-color:#dcdcdc" %)ATZ
1674
1675
1676 )))
1677
1678 === 4.2.2 Single-channel ABP mode (Use with LG01/LG02) ===
1679
1680 (((
1681 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1682 )))
1683
1684 (((
1685 (% style="background-color:#dcdcdc" %) AT+FDR(%%)   Reset Parameters to Factory Default, Keys Reserve
1686 )))
1687
1688 (((
1689 (% style="background-color:#dcdcdc" %) 123456(%%)   Enter Password to have AT access.
1690 )))
1691
1692 (((
1693 (% style="background-color:#dcdcdc" %) AT+CLASS=C(%%) Set to work in CLASS C
1694 )))
1695
1696 (((
1697 (% style="background-color:#dcdcdc" %) AT+NJM=0(%%) Set to ABP mode
1698 )))
1699
1700 (((
1701 (% style="background-color:#dcdcdc" %) AT+ADR=0(%%) Set the Adaptive Data Rate Off
1702 )))
1703
1704 (((
1705 (% style="background-color:#dcdcdc" %) AT+DR=5(%%)  Set Data Rate
1706 )))
1707
1708 (((
1709 (% style="background-color:#dcdcdc" %) AT+TDC=60000(%%)  Set transmit interval to 60 seconds
1710 )))
1711
1712 (((
1713 (% style="background-color:#dcdcdc" %) AT+CHS=868400000(%%) Set transmit frequency to 868.4Mhz
1714 )))
1715
1716 (((
1717 (% style="background-color:#dcdcdc" %) AT+RX2FQ=868400000(%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
1718 )))
1719
1720 (((
1721 (% style="background-color:#dcdcdc" %) AT+RX2DR=5(%%)  Set RX2DR to match the downlink DR from server. see below
1722 )))
1723
1724 (((
1725 (% 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.
1726 )))
1727
1728 (((
1729 (% style="background-color:#dcdcdc" %) ATZ         (%%) Reset MCU
1730 )))
1731
1732 (((
1733 (% style="color:red" %)**Note:**
1734 )))
1735
1736 (((
1737 (% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
1738 2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
1739 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.
1740 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
1741 )))
1742
1743 (((
1744 [[image:1653359097980-169.png||height="188" width="729"]]
1745 )))
1746
1747 (((
1748
1749 )))
1750
1751 === 4.2.3 Change to Class A ===
1752
1753 If sensor JOINED
1754 (% style="background-color:#dcdcdc" %)AT+CLASS=A
1755 ATZ
1756
1757
1758 = 5. FAQ =
1759
1760 == 5.1 How to upgrade the image? ==
1761
1762 The LT LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to LT to:
1763
1764 * Support new features
1765 * For bug fix
1766 * Change LoRaWAN bands.
1767 Below shows the hardware connection for how to upload an image to the LT:
1768 * [[image:1653359603330-121.png]]
1769
1770 (((
1771 **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]].
1772 **Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
1773 **Step3: **Open flashloader; choose the correct COM port to update.
1774 **For LT-22222-L**:
1775 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.
1776 )))
1777
1778 [[image:image-20220524103407-12.png]]
1779
1780 [[image:image-20220524103429-13.png]]
1781
1782 [[image:image-20220524104033-15.png]]
1783
1784 (% 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:
1785
1786 [[image:1653360054704-518.png||height="186" width="745"]]
1787
1788
1789 (((
1790 (((
1791 == 5.2 How to change the LoRa Frequency Bands/Region? ==
1792 )))
1793 )))
1794
1795 (((
1796 User can follow the introduction for [[how to upgrade image>>||anchor="H5.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
1797
1798
1799 )))
1800
1801 (((
1802 == 5.3 How to set up LT to work with Single Channel Gateway such as LG01/LG02? ==
1803 )))
1804
1805 (((
1806 (((
1807 In this case, users need to set LT-33222-L to work in ABP mode & transmit in only one frequency.
1808 )))
1809 )))
1810
1811 (((
1812 (((
1813 Assume we have a LG02 working in the frequency 868400000 now , below is the step.
1814 )))
1815 )))
1816
1817 (((
1818 (% 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.
1819 )))
1820
1821 (((
1822 [[image:1653360231087-571.png||height="401" width="727"]]
1823 )))
1824
1825 (((
1826 (% 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.
1827 )))
1828
1829 (((
1830 (% style="color:#4f81bd" %)**Step2**(%%)**: **Run AT Command to make LT work in Single frequency & ABP mode. Below is the AT commands:
1831 )))
1832
1833 (((
1834 (% style="background-color:#dcdcdc" %)123456 (%%) Enter Password to have AT access.
1835 (% style="background-color:#dcdcdc" %)AT+FDR  (%%) Reset Parameters to Factory Default, Keys Reserve
1836 (% style="background-color:#dcdcdc" %)123456  (%%) Enter Password to have AT access.
1837 (% style="background-color:#dcdcdc" %)AT+NJM=0 (%%)Set to ABP mode
1838 (% style="background-color:#dcdcdc" %)AT+ADR=0 (%%)Set the Adaptive Data Rate Off
1839 (% style="background-color:#dcdcdc" %)AT+DR=5 (%%) Set Data Rate (Set AT+DR=3 for 915 band)
1840 (% style="background-color:#dcdcdc" %)AT+TDC=60000  (%%)Set transmit interval to 60 seconds
1841 (% style="background-color:#dcdcdc" %)AT+CHS=868400000 (%%)Set transmit frequency to 868.4Mhz
1842 (% style="background-color:#dcdcdc" %)AT+DADDR=26 01 1A F1(%%) Set Device Address to 26 01 1A F1
1843 (% style="background-color:#dcdcdc" %)ATZ                (%%)Reset MCU
1844 )))
1845
1846 (((
1847 As shown in below:
1848 )))
1849
1850 [[image:1653360498588-932.png||height="485" width="726"]]
1851
1852
1853 == 5.4 Can I see counting event in Serial? ==
1854
1855 (((
1856 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.
1857
1858
1859 )))
1860
1861 (((
1862 = 6. Trouble Shooting =
1863 )))
1864
1865 (((
1866 (((
1867 == 6.1 Downlink doesn’t work, how to solve it? ==
1868 )))
1869 )))
1870
1871 (((
1872 Please see this link for how to debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H5.1Howitwork"]]
1873
1874
1875 )))
1876
1877 (((
1878 == 6.2 Have trouble to upload image. ==
1879 )))
1880
1881 (((
1882 See this link for trouble shooting: [[Firmware Upgrade Instruction>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome]]
1883 )))
1884
1885 (((
1886
1887 )))
1888
1889 (((
1890 == 6.3 Why I can’t join TTN in US915 /AU915 bands? ==
1891 )))
1892
1893 (((
1894 It might be about the channels mapping. [[Please see this link for detail>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1895 )))
1896
1897 (((
1898
1899 )))
1900
1901 (((
1902 = 7. Order Info =
1903 )))
1904
1905 (((
1906 (((
1907 (% style="color:#4f81bd" %)**LT-22222-L-XXX:**
1908 )))
1909 )))
1910
1911 (((
1912 (((
1913 (% style="color:#4f81bd" %)**XXX:**
1914 )))
1915 )))
1916
1917 (((
1918 * (((
1919 (% style="color:#4f81bd" %)**EU433**(%%): LT with frequency bands EU433
1920 )))
1921 )))
1922
1923 (((
1924 * (((
1925 (% style="color:#4f81bd" %)**EU868**(%%): LT with frequency bands EU868
1926 )))
1927 )))
1928
1929 (((
1930 * (((
1931 (% style="color:#4f81bd" %)**KR920**(%%): LT with frequency bands KR920
1932 )))
1933 )))
1934
1935 (((
1936 * (((
1937 (% style="color:#4f81bd" %)**CN470**(%%): LT with frequency bands CN470
1938 )))
1939 )))
1940
1941 (((
1942 * (((
1943 (% style="color:#4f81bd" %)**AS923**(%%): LT with frequency bands AS923
1944 )))
1945 )))
1946
1947 (((
1948 * (((
1949 (% style="color:#4f81bd" %)**AU915**(%%): LT with frequency bands AU915
1950 )))
1951 )))
1952
1953 (((
1954 * (((
1955 (% style="color:#4f81bd" %)**US915**(%%): LT with frequency bands US915
1956 )))
1957 )))
1958
1959 (((
1960 * (((
1961 (% style="color:#4f81bd" %)**IN865**(%%): LT with frequency bands IN865
1962 )))
1963 )))
1964
1965 (((
1966 * (((
1967 (% style="color:#4f81bd" %)**CN779**(%%): LT with frequency bands CN779
1968
1969
1970 )))
1971
1972 = 8. Packing Info =
1973 )))
1974
1975 (((
1976 (((
1977 **Package Includes**:
1978 )))
1979 )))
1980
1981 (((
1982 (((
1983 * LT-22222-L I/O Controller x 1
1984 * Stick Antenna for LoRa RF part x 1
1985 * Bracket for controller x1
1986 * Program cable x 1
1987 )))
1988 )))
1989
1990 (((
1991 (((
1992 **Dimension and weight**:
1993 )))
1994 )))
1995
1996 (((
1997 (((
1998 * Device Size: 13.5 x 7 x 3 cm
1999 * Device Weight: 105g
2000 * Package Size / pcs : 14.5 x 8 x 5 cm
2001 * Weight / pcs : 170g
2002
2003
2004 )))
2005 )))
2006
2007 (((
2008 = 9. Support =
2009 )))
2010
2011 * (((
2012 (((
2013 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.
2014 )))
2015 )))
2016 * (((
2017 (((
2018 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
2019 )))
2020 )))
2021
2022 (((
2023 (((
2024 [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
2025
2026
2027 )))
2028
2029 (((
2030 = 10. Reference​​​​​ =
2031
2032 * Product Page:
2033
2034 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]]
2035
2036 * [[Image Download>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]]
2037 * [[AT Command Manual>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
2038 * [[Hardware Source>>url:https://github.com/dragino/Lora/tree/master/LT/LT-33222-L/v1.0]]
2039 )))
2040 )))

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