Last modified by Edwin Chen on 2022/11/22 09:38
<
From version < 7.1 >
edited by Xiaoling
on 2022/06/02 11:36
To version < 19.2 >
edited by Xiaoling
on 2022/11/15 08:47
>
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Title
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1 - Point to Point Communication of LT-22222-L
1 +Point to Point Communication of LT-22222-L
Content
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1 -{{box cssClass="floatinginfobox" title="**Contents**"}}
1 +**Contents： **
2 +
2 2  {{toc/}}
3 -{{/box}}
4 4  
5 +
6 +
7 +
5 5  = **1. Overview** =
6 6  
7 7  (((
11 +
12 +
8 8  Shipped LT-22222-L is base on LoRaWAN protocol. We also develop a open source Point to Point LoRa protocol for LT-22222-L. The source code and hex file can be found at:
9 9  )))
10 10  
... ... @@ -12,18 +12,20 @@
12 12  [[Point to Point Software for LT-22222-L>>https://github.com/dragino/LT-22222-L]].
13 13  )))
14 14  
15 -== ==
16 16  
17 17  = **2. Features for this firmware** =
18 18  
23 +== **2.1  Point To Point** ==
19 19  
20 -== **2.1  Overview** ==
25 +=== **2.1.1 Overview** ===
21 21  
22 -[[image:image-20220602111219-1.png]]
23 23  
28 +[[image:image-20220602111219-1.png||height="472" width="972"]]
24 24  
25 -== **2.2. Configure** ==
26 26  
31 +=== **2.2.2 Configure** ===
32 +
33 +
27 27  (% border="1" style="background-color:#f7faff; color:black; width:500px" %)
28 28  |=**A's configuration**|=**B's configuration**
29 29  |AT+GROUPMOD=0|AT+GROUPMOD=0
... ... @@ -36,14 +36,656 @@
36 36  |AT+DI2TODO2=2 |AT+DI2TODO2=2
37 37  |AT+DI2TORO2=2|AT+DI2TORO2=2
38 38  
39 -== **2.3.  Serial port display** ==
40 40  
41 41  
48 +=== **2.2.3 Serial port display** ===
49 +
50 +
51 +(% class="wikigeneratedid" %)
42 42  [[image:image-20220602111219-2.png]]
43 43  
44 44  
55 +(% class="wikigeneratedid" %)
45 45  [[image:image-20220602111219-3.png]]
46 46  
58 +
59 +(% class="wikigeneratedid" %)
47 47  If the sender does not get the ACK reply from the receiver, it will retransmit up to 4 times, each interval is 6 seconds, and the UplinkCounter of the retransmission will not increase.
48 48  
62 +
63 +== **2.2  Point To Mult-Point ** ==
64 +
65 +=== **2.2.1 Overview** ===
66 +
67 +
68 +[[image:1654152390874-192.png]]
69 +
70 +
71 +=== **2.2.2  Configure** ===
72 +
73 +
74 +(% style="color:blue" %)**Configuration of the TX group:**
75 +
76 +AT+GROUPMOD=0,2
77 +
78 +AT+TXCHS=868700000
79 +
80 +AT+RXCHS=869000000
81 +
82 +AT+TRIG1=2,50
83 +
84 +AT+TRIG2=2,50
85 +
86 +AT+DI1TODO1=1
87 +
88 +AT+DI1TORO1=1
89 +
90 +AT+DI2TODO2=1
91 +
92 +AT+DI2TORO2=1
93 +
94 +
95 +(% style="color:blue" %)**Configuration for RX group number 1:**
96 +
97 +AT+GROUPMOD=1,1
98 +
99 +AT+TXCHS=869000000
100 +
101 +AT+RXCHS=868700000
102 +
103 +
104 +(% style="color:blue" %)**Configuration for RX group number 2:**
105 +
106 +AT+GROUPMOD=1,2
107 +
108 +AT+TXCHS=869000000
109 +
110 +AT+RXCHS=868700000
111 +
112 +
113 +=== **2.2.3 Serial port display** ===
114 +
115 +
116 +[[image:image-20220602144747-1.png]]
117 +
118 +
119 +[[image:image-20220602144747-2.png]]
120 +
121 +(((
122 +If the TX group does not receive all the ACK replies from the RX group, it will retransmit up to 4 times, each time interval is 30 seconds, and the retransmission UplinkCounter will not increase.
123 +)))
124 +
125 +
126 +== **2.3 AT command** ==
127 +
128 +
129 +(((
130 +(% style="color:#037691" %)**ATZ** (%%)**: ** Trig a reset of the MCU
131 +)))
132 +
133 +(((
134 +(% style="color:#037691" %)**AT+FDR** (%%)**:**  Reset Parameters to Factory Default, Keys Reserve
135 +)))
136 +
137 +(((
138 +(% style="color:#037691" %)**AT+FCU** (%%)**:**  Get or Set the Frame Counter Uplink
139 +)))
140 +
141 +(((
142 +(% style="color:#037691" %)**AT+FCD** (%%)**:**  Get or Set the Frame Counter Downlink
143 +)))
144 +
145 +(((
146 +(% style="color:#037691" %)**AT+TXP** (%%)**:**  Get or Set the transmit power, the maximum is 20dBm (default is 14dBm)
147 +)))
148 +
149 +(((
150 +(% style="color:#037691" %)**AT+SYNC** (%%)**:**  Get or Set the Sync word [1:0x34,0:0x12] (default is 1)
151 +)))
152 +
153 +(((
154 +(% style="color:#037691" %)**AT+PMB** (%%)**:    **Get or Set the preamble (default:8)
155 +)))
156 +
157 +(((
158 +(% style="color:#037691" %)**AT+TXCHS **(%%)**:** Get or Set the transmit frequency of TX (default:868700000)
159 +)))
160 +
161 +(((
162 +(% style="color:#037691" %)**AT+TXSF **(%%)**:**  Get or Set the spreading factor of TX (7 to 12) (default:12)
163 +)))
164 +
165 +(((
166 +(% style="color:#037691" %)**AT+RXCHS **(%%)**:** Get or Set the transmit frequency of RX (default:869000000)
167 +)))
168 +
169 +(((
170 +(% style="color:#037691" %)**AT+RXSF **(%%)**:**  Get or Set the spreading factor of RX (7 to 12) (default:12)
171 +)))
172 +
173 +(((
174 +(% style="color:#037691" %)**AT+BW **(%%)**:       **Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0)
175 +)))
176 +
177 +(((
178 +(% style="color:#037691" %)**AT+CR **(%%)**:        **Get or Set the coding rate [1: 4/5, 2: 4/6, 3: 4/7, 4: 4/8] (default:1)
179 +)))
180 +
181 +(((
182 +(% style="color:#037691" %)**AT+TDC **(%%)**:**  Get or set the application data transmission interval in ms(default 10 minutes)
183 +)))
184 +
185 +(((
186 +(% style="color:#037691" %)**AT+VER **(%%)**:**  Get firmware version number
187 +)))
188 +
189 +(((
190 +(% style="color:#037691" %)**AT+SEND **(%%)**:   **Set Custom sent hex data
191 +)))
192 +
193 +(((
194 +(% style="color:#037691" %)**AT+GROUPMOD **(%%)**: **Set or Get the grouping mode of the device (default: 0)
195 +)))
196 +
197 +(((
198 +(((
199 +(% style="color:#037691" %)**AT+GROUPID **(%%)**:      **Set or Get the password for matching between TX group and RX group, which can be composed of numbers or characters (default: 12345678)
200 +)))
201 +)))
202 +
203 +(((
204 +(% style="color:#037691" %)**AT+TRIG1 **(%%)**:**  Set or Get the DI1 pin interrupt trigger mode (default 0,0)
205 +)))
206 +
207 +(((
208 +(% style="color:#037691" %)**AT+TRIG2 **(%%)**:            **Set or Get the DI2 pin interrupt trigger mode (default 0,0)
209 +)))
210 +
211 +(((
212 +(% style="color:#037691" %)**AT+DI1TODO1 **(%%)**:    **Set or get the mode in which DI1 maps to DO1 (default 0)
213 +)))
214 +
215 +(((
216 +(% style="color:#037691" %)**AT+DI1TORO1 **(%%)**:    **Set or get the mode in which DI1 maps to RO1(default 0)
217 +)))
218 +
219 +(((
220 +(% style="color:#037691" %)**AT+DI2TODO2 **(%%)**:**  Set or get the mode in which DI2 maps to DO2(default 0)
221 +)))
222 +
223 +(((
224 +(% style="color:#037691" %)**AT+DI2TORO2 **(%%)**:    **Set or get the mode in which DI2 maps to RO2(default 0)
225 +)))
226 +
227 +
228 +
229 +(((
230 +(% style="color:#4f81bd" %)**Example 1:**
231 +)))
232 +
233 +(((
234 +**AT+SEND=01020304 **will send a payload of 01020304
235 +)))
236 +
237 +
238 +
239 +(((
240 +(% style="color:blue" %)**Example 2: **
241 +)))
242 +
243 +(((
244 +**AT+TRIGx=a    **Trigger directly without triggering time
245 +)))
246 +
247 +(((
248 +**AT+TRIGx=a,b**
249 +)))
250 +
251 +(((
252 +a=0: falling edge;
253 +)))
254 +
255 +(((
256 +a=1: rising edge;
257 +)))
258 +
259 +(((
260 +a=2: falling edge or rising edge;
261 +)))
262 +
263 +(((
264 +b:  triggering time in milliseconds.
265 +)))
266 +
267 +(((
268 +AT+TRIGx=2,50  Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
269 +)))
270 +
271 +
272 +(((
273 +(% style="color:blue" %)**Example 3: **
274 +)))
275 +
276 +(((
277 +**AT+DI1TODO1= maps value**
278 +)))
279 +
280 +(((
281 +**AT+DI1TORO1= maps value**
282 +)))
283 +
284 +(((
285 +**AT+DI2TODO2= maps value**
286 +)))
287 +
288 +(((
289 +**AT+DI2TORO2= maps value**
290 +)))
291 +
292 +(((
49 49  
294 +)))
295 +
296 +(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
297 +|=(% style="width: 102px;" %)(((
298 +Maps value
299 +)))|=(% style="width: 331px;" %)(((
300 +DIx to DOx
301 +)))|=(% style="width: 268px;" %)(((
302 +DIx to ROx
303 +)))
304 +|(% style="width:102px" %)(((
305 +0
306 +)))|(% style="width:331px" %)(((
307 +No Action
308 +)))|(% style="width:268px" %)(((
309 +No Action
310 +)))
311 +|(% style="width:102px" %)(((
312 +1
313 +)))|(% style="width:331px" %)(((
314 +If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level
315 +)))|(% style="width:268px" %)(((
316 +(((
317 +If DIx is high, control ROx to close,
318 +)))
319 +
320 +(((
321 +if DIx is low, control ROx to open
322 +)))
323 +)))
324 +|(% style="width:102px" %)(((
325 +2
326 +)))|(% style="width:331px" %)(((
327 +If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level
328 +)))|(% style="width:268px" %)(((
329 +(((
330 +If DIx is high, control ROx to open,
331 +)))
332 +
333 +(((
334 +if DIx is low, control ROx to close
335 +)))
336 +)))
337 +|(% style="width:102px" %)(((
338 +3
339 +)))|(% style="width:331px" %)(((
340 +DOx state flip
341 +)))|(% style="width:268px" %)(((
342 +ROx state flip
343 +)))
344 +
345 +(((
346 +(% style="color:blue" %)**Example 4: **
347 +)))
348 +
349 +(((
350 +**AT+GROUPMOD=0**  Set to point to point mode
351 +)))
352 +
353 +(((
354 +**AT+GROUPMOD=0,aa**  Set the TX group that controls the number of aa (The maximum value of aa is 8)
355 +)))
356 +
357 +
358 +(((
359 +**AT+GROUPMOD=1,bb**  Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8)
360 +)))
361 +
362 +
363 +(((
364 +**AT+GROUPMOD=0,2**  Set to control the TX group of the two RX groups
365 +)))
366 +
367 +(((
368 +**AT+GROUPMOD=1,1**  Set the RX group numbered 1
369 +)))
370 +
371 +(((
372 +**AT+GROUPMOD=1,2**  Set the RX group numbered 2
373 +)))
374 +
375 +
376 +=== 2.3.1 TRIG command is configured in the transmit LT. (LT1)(Since firmware 1.3) ===
377 +
378 +
379 +**AT+TRIGx=a     **Trigger transmit directly without triggering time
380 +
381 +**AT+TRIGx=a,b**  Trigger transmit with triggering time threshold
382 +
383 +**AT+TRIGx=a,b,c **Trigger transmit with triggering time threshold, and continue to transmit every xx seconds if DI status no change.
384 +
385 +
386 +a=0: falling edge;
387 +
388 +a=1: rising edge;
389 +
390 +a=2: falling edge or rising edge;
391 +
392 +b:  triggering time in milliseconds.
393 +
394 +c: transmit interval
395 +
396 +
397 +**(% style="color:blue" %)Use Case 1**(%%): Once the DI1 port status change ( either from low to high or high to low, LT1 sends a trigger to LT-2)
398 +
399 +Command:
400 +
401 +AT+TRIG1=2,50  Falling edge or rising edge trigger, and the trigger time should exceed 50ms.
402 +
403 +
404 +**(% style="color:blue" %)Use Case 2: **(%%)Sync LT2 RO / DO status with LT1 every minute.
405 +
406 +Command:
407 +
408 +AT+TRIG2=2,50,60 Once there is falling edge or rising edge on DI2 of LT1, LT1 will transmit trigger to LT2 and LT2 can sync the status of RO/DO.
409 +
410 +
411 +=== 2.3.2 RO/DO is configured in the receiver LT (LT2)(Since firmware 1.3) ===
412 +
413 +AT+DI1TODO1= maps value[,latch time]
414 +
415 +AT+DI1TORO1= maps value[,latch time]
416 +
417 +AT+DI2TODO2= maps value[,latch time]
418 +
419 +AT+DI2TORO2= maps value[,latch time]
420 +
421 +
422 +(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
423 +| **Maps value**|DIx to DOx|DIx to ROx
424 +|0|No Action|No Action
425 +|1|If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level|(((
426 +If DIx is high, control ROx to close,
427 +
428 +if DIx is low, control ROx to open
429 +)))
430 +|2|If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level|(((
431 +If DIx is high, control ROx to open,
432 +
433 +if DIx is low, control ROx to close
434 +)))
435 +|3|DOx state flip|ROx state flip
436 +
437 +latch time, if latch time is defined, DO or RO will go back to the original status after latch time, if there is a new trigger comes, the LT2 will use the new latch time settings and ignore the old one.
438 +
439 +
440 +**(% style="color:blue" %)Case1**:
441 +
442 +AT+DI1TODO1=1 ~/~/ LT2 DO1 will follow LT1 DI1 trigger command, if DI1 of LT1 is trigger high, DO1 of LT2 will output low, if DI1 of LT1 is trigger low, DO2 of LT2 will output high.
443 +
444 +
445 +**(% style="color:blue" %)Case2**:
446 +
447 +AT+DI1TODO1=1,60 ~/~/ LT2 DO1 will follow LT1 DI1 trigger command, DO1 will keep the status 60 seconds and then go back to original state.
448 +
449 +
450 +=== 2.3.3 Save the RO/DO status during power off(Since firmware 1.3) ===
451 +
452 +
453 +Enable/Disbale retain Digital Output/Relay Output after power off / Power On
454 +
455 +AT+DOROSAVE=0 ~/~/ Disable Retain after power off/on
456 +
457 +AT+DOROSAVE=1 ~/~/ Enable Retain after power off/on
458 +
459 +AT+DOROSAVE=2,a,b,c,d ~/~/ set DO/RO port to default state after power on.
460 +
461 +a: for DO1
462 +
463 +b: for DO2
464 +
465 +c: for RO1
466 +
467 +d: for RO2.
468 +
469 +Example:
470 +
471 +AT+DOROSAVE=2,0,0,0,1 ~/~/ Set DO1/DO2 to Low, RO1 to open after power on , set RO2 to close after power on.
472 +
473 +
474 +=== 2.3.4 Control Sleep status.(Since firmware 1.3) ===
475 +
476 +DI2 can be used to set LT into sleep mode.
477 +
478 +AT+DI2SLEEP=1 ~/~/Enable DI2 as Sleep pin
479 +
480 +AT+DI2SLEEP=0 ~/~/Disable DI2 as Sleep pin
481 +
482 +When DI2 is enabled as sleep pin, a falling trigger (with 500ms pulse) will set LT into sleep mode. A raising trigger will wake up it again.
483 +
484 +
485 +== **2.4 Data Format** ==
486 +
487 +
488 +(((
489 +8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
490 +)))
491 +
492 +(((
493 +
494 +)))
495 +
496 +(((
497 +(% style="color:blue" %)**Payload:**
498 +)))
499 +
500 +(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
501 +|=(% style="width: 123px;" %)(((
502 +**Size (bytes)**
503 +)))|=(% style="width: 107px;" %)(((
504 +1
505 +)))|=(% style="width: 107px;" %)(((
506 +1
507 +)))|=(% style="width: 107px;" %)(((
508 +1
509 +)))|=(% style="width: 107px;" %)(((
510 +1
511 +)))|=(% style="width: 107px;" %)(((
512 +1
513 +)))|=(% style="width: 107px;" %)(((
514 +1
515 +)))|=(% style="width: 107px;" %)(((
516 +1
517 +)))|=(% style="width: 107px;" %)(((
518 +1
519 +)))|=(% style="width: 107px;" %)(((
520 +1
521 +)))
522 +|(% style="width:123px" %)(((
523 +**Value**
524 +)))|(% style="width:38px" %)(((
525 +address
526 +)))|(% style="width:70px" %)(((
527 +request
528 +)))|(% style="width:52px" %)(((
529 +ACK
530 +)))|(% style="width:127px" %)(((
531 +(((
532 +DI1&
533 +)))
534 +
535 +(((
536 +DI1 level
537 +)))
538 +)))|(% style="width:101px" %)(((
539 +DI1TODO1
540 +)))|(% style="width:91px" %)(((
541 +DI1TORO1
542 +)))|(% style="width:111px" %)(((
543 +(((
544 +DI2&
545 +)))
546 +
547 +(((
548 +DI2 level
549 +)))
550 +)))|(% style="width:105px" %)(((
551 +DI2TODO2
552 +)))|(% style="width:106px" %)(((
553 +DI2TORO2
554 +)))
555 +
556 +(((
557 +(% style="color:#037691" %)**The first byte**(%%)**:**  00 is the broadcast address, 01-08 is the RX group number.
558 +)))
559 +
560 +(((
561 +(% style="color:#037691" %)**The second byte**(%%)**:**  send mapping request when not 0, not request when it is 0.
562 +)))
563 +
564 +(((
565 +(% style="color:#037691" %)**The third byte**(%%)**:**  ACK returned to the sender after the mapping is completed.
566 +)))
567 +
568 +(((
569 +(((
570 +(% style="color:#037691" %)**The fourth byte**(%%)**:**  the high four bits are 1 to represent DI1, and the low four bits are the level of DI1 when the interrupt is triggered.
571 +)))
572 +)))
573 +
574 +(((
575 +(% style="color:#037691" %)**The Fifth byte**(%%)**:       **DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
576 +)))
577 +
578 +(((
579 +(% style="color:#037691" %)**The Sixth byte**(%%)**:**  0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
580 +)))
581 +
582 +(((
583 +(((
584 +(% style="color:#037691" %)**The seventh byte**(%%)**:**  the high four bits are 2 to represent DI2, and the low four bits are the level of DI2 when the interrupt is triggered.
585 +)))
586 +)))
587 +
588 +(((
589 +(% style="color:#037691" %)**The 8th byte**(%%)**:          **DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
590 +)))
591 +
592 +(((
593 +(% style="color:#037691" %)**The 9th byte**(%%)**:**  DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
594 +)))
595 +
596 +(((
597 +
598 +
599 +(% style="color:#4f81bd" %)**Payload:（Since firmware 1.3）The receiver replies to the sent packet**
600 +)))
601 +
602 +(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
603 +|=(% style="width: 123px;" %)(((
604 +**Size (bytes)**
605 +)))|=(% style="width: 107px;" %)(((
606 +1
607 +)))|=(% style="width: 107px;" %)(((
608 +1
609 +)))|=(% style="width: 107px;" %)(((
610 +1
611 +)))|=(% style="width: 107px;" %)(((
612 +1
613 +)))|=(% style="width: 107px;" %)(((
614 +1
615 +)))|=(% style="width: 107px;" %)(((
616 +1
617 +)))|=(% style="width: 107px;" %)(((
618 +1
619 +)))|=(% style="width: 107px;" %)(((
620 +1
621 +)))|=(% style="width: 107px;" %)(((
622 +1
623 +)))
624 +|(% style="width:123px" %)(((
625 +**Value**
626 +)))|(% style="width:38px" %)(((
627 +address
628 +)))|(% style="width:70px" %)(((
629 +request
630 +)))|(% style="width:52px" %)(((
631 +ACK
632 +)))|(% style="width:127px" %)(((
633 +(((
634 +DO1&
635 +)))
636 +
637 +(((
638 +DO1 level
639 +)))
640 +)))|(% style="width:101px" %)(((
641 +DI1TODO1
642 +)))|(% style="width:91px" %)(((
643 +DI1TORO1
644 +)))|(% style="width:111px" %)(((
645 +(((
646 +RO2&
647 +)))
648 +
649 +(((
650 +RO2 level
651 +)))
652 +)))|(% style="width:105px" %)(((
653 +DI2TODO2
654 +)))|(% style="width:106px" %)(((
655 +DI2TORO2
656 +)))
657 +
658 +(((
659 +(% style="color:#037691" %)**The first byte**(%%)**:**  00 is the broadcast address, 01-08 is the RX group number.
660 +)))
661 +
662 +(((
663 +(% style="color:#037691" %)**The second byte**(%%)**:**  send mapping request when not 0, not request when it is 0.
664 +)))
665 +
666 +(((
667 +(% style="color:#037691" %)**The third byte**(%%)**:**  ACK returned to the sender after the mapping is completed.
668 +)))
669 +
670 +(((
671 +(((
672 +(% style="color:#037691" %)**The fourth byte**(%%)**:**  the high four bits are 1 to represent DO1, and the low four bits are the level of DO1 when the interrupt is triggered.
673 +)))
674 +)))
675 +
676 +(((
677 +(% style="color:#037691" %)**The Fifth byte**(%%)**:       **DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
678 +)))
679 +
680 +(((
681 +(% style="color:#037691" %)**The Sixth byte**(%%)**:**  0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
682 +)))
683 +
684 +(((
685 +(((
686 +(% style="color:#037691" %)**The seventh byte**(%%)**:**  the high four bits are 2 to represent RO2, and the low four bits are the level of RO2 when the interrupt is triggered.
687 +)))
688 +)))
689 +
690 +(((
691 +(% style="color:#037691" %)**The 8th byte**(%%)**:          **DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
692 +)))
693 +
694 +(((
695 +(% style="color:#037691" %)**The 9th byte**(%%)**:**  DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
696 +)))
697 +
698 +
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