Last modified by Edwin Chen on 2022/11/22 09:38
<
From version < 15.5 >
edited by Xiaoling
on 2022/06/02 14:52
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  
... ... @@ -12,11 +12,9 @@
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  
19 -
20 20  == **2.1  Point To Point** ==
21 21  
22 22  === **2.1.1 Overview** ===
... ... @@ -52,6 +52,7 @@
52 52  (% class="wikigeneratedid" %)
53 53  [[image:image-20220602111219-3.png]]
54 54  
58 +
55 55  (% class="wikigeneratedid" %)
56 56  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.
57 57  
... ... @@ -67,7 +67,7 @@
67 67  === **2.2.2  Configure** ===
68 68  
69 69  
70 -(% style="color:#4f81bd" %)**Configuration of the TX group:**
74 +(% style="color:blue" %)**Configuration of the TX group:**
71 71  
72 72  AT+GROUPMOD=0,2
73 73  
... ... @@ -88,7 +88,7 @@
88 88  AT+DI2TORO2=1
89 89  
90 90  
91 -(% style="color:#4f81bd" %)**Configuration for RX group number 1:**
95 +(% style="color:blue" %)**Configuration for RX group number 1:**
92 92  
93 93  AT+GROUPMOD=1,1
94 94  
... ... @@ -97,7 +97,7 @@
97 97  AT+RXCHS=868700000
98 98  
99 99  
100 -(% style="color:#4f81bd" %)**Configuration for RX group number 2:**
104 +(% style="color:blue" %)**Configuration for RX group number 2:**
101 101  
102 102  AT+GROUPMOD=1,2
103 103  
... ... @@ -119,8 +119,6 @@
119 119  )))
120 120  
121 121  
122 -
123 -
124 124  == **2.3 AT command** ==
125 125  
126 126  
... ... @@ -222,13 +222,7 @@
222 222  (% style="color:#037691" %)**AT+DI2TORO2 **(%%)**:    **Set or get the mode in which DI2 maps to RO2(default 0)
223 223  )))
224 224  
225 -(((
226 -
227 -)))
228 228  
229 -(((
230 -
231 -)))
232 232  
233 233  (((
234 234  (% style="color:#4f81bd" %)**Example 1:**
... ... @@ -238,12 +238,10 @@
238 238  **AT+SEND=01020304 **will send a payload of 01020304
239 239  )))
240 240  
241 -(((
242 -
243 -)))
244 244  
238 +
245 245  (((
246 -(% style="color:#4f81bd" %)**Example 2: **
240 +(% style="color:blue" %)**Example 2: **
247 247  )))
248 248  
249 249  (((
... ... @@ -274,12 +274,9 @@
274 274  AT+TRIGx=2,50  Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
275 275  )))
276 276  
277 -(((
278 -
279 -)))
280 280  
281 281  (((
282 -(% style="color:#4f81bd" %)**Example 3: **
273 +(% style="color:blue" %)**Example 3: **
283 283  )))
284 284  
285 285  (((
... ... @@ -352,7 +352,7 @@
352 352  )))
353 353  
354 354  (((
355 -(% style="color:#4f81bd" %)**Example 4: **
346 +(% style="color:blue" %)**Example 4: **
356 356  )))
357 357  
358 358  (((
... ... @@ -363,12 +363,12 @@
363 363  **AT+GROUPMOD=0,aa**  Set the TX group that controls the number of aa (The maximum value of aa is 8)
364 364  )))
365 365  
357 +
366 366  (((
367 -(((
368 368  **AT+GROUPMOD=1,bb**  Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8)
369 369  )))
370 -)))
371 371  
362 +
372 372  (((
373 373  **AT+GROUPMOD=0,2**  Set to control the TX group of the two RX groups
374 374  )))
... ... @@ -382,8 +382,118 @@
382 382  )))
383 383  
384 384  
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 +
385 385  == **2.4 Data Format** ==
386 386  
487 +
387 387  (((
388 388  8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
389 389  )))
... ... @@ -393,7 +393,7 @@
393 393  )))
394 394  
395 395  (((
396 -(% style="color:#4f81bd" %)**Payload:**
497 +(% style="color:blue" %)**Payload:**
397 397  )))
398 398  
399 399  (% border="1" style="background-color:#f7faff; color:black; width:938px" %)
... ... @@ -492,4 +492,106 @@
492 492  (% style="color:#037691" %)**The 9th byte**(%%)**:**  DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
493 493  )))
494 494  
596 +(((
495 495  
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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