Last modified by Edwin Chen on 2022/11/22 09:38
<
From version < 25.1 >
edited by Edwin Chen
on 2022/11/19 09:37
To version < 15.3 >
edited by Xiaoling
on 2022/06/02 14:52
>
Change comment: There is no comment for this version

Summary

Details

Page properties
Title
... ... @@ -1,1 +1,1 @@
1 -Point to Point Communication of LT-22222-L
1 + Point to Point Communication of LT-22222-L
Author
... ... @@ -1,1 +1,1 @@
1 -XWiki.Edwin
1 +XWiki.Xiaoling
Content
... ... @@ -1,49 +1,49 @@
1 -**Table of Contents： **
2 -
1 +{{box cssClass="floatinginfobox" title="**Contents**"}}
3 3  {{toc/}}
3 +{{/box}}
4 4  
5 += **1. Overview** =
5 5  
6 -
7 -
8 -= 1. Overview =
9 -
10 10  (((
11 -
12 -
13 13  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 +)))
14 14  
15 -* [[Source Code>>https://github.com/dragino/LT-22222-L]].
16 -* [[Firmware>>https://github.com/dragino/LT-22222-L/releases]].
11 +(((
12 +[[Point to Point Software for LT-22222-L>>https://github.com/dragino/LT-22222-L]].
17 17  )))
18 18  
19 -= 2. Features for this firmware =
15 +== ==
20 20  
21 -== 2.1  Point To Point ==
17 += **2. Features for this firmware** =
22 22  
23 -=== 2.1.1 Overview ===
24 24  
20 +== **2.1  Point To Point** ==
25 25  
22 +=== **2.1.1 Overview** ===
23 +
26 26  [[image:image-20220602111219-1.png||height="472" width="972"]]
27 27  
28 28  
29 -=== 2.2.2 Configure ===
27 +=== **2.2.2 Configure** ===
30 30  
31 31  
32 -(% border="1" style="background-color:#f7faff; color:black; width:360px" %)
33 -|=(% style="width: 179px;" %)**A's configuration**|=(% style="width: 177px;" %)**B's configuration**
34 -|(% style="width:179px" %)AT+GROUPMOD=0|(% style="width:177px" %)AT+GROUPMOD=0
35 -|(% style="width:179px" %)AT+TXCHS=868700000|(% style="width:177px" %)AT+TXCHS=869000000
36 -|(% style="width:179px" %)AT+RXCHS=869000000|(% style="width:177px" %)AT+RXCHS=868700000
37 -|(% style="width:179px" %)AT+TRIG1=2,50|(% style="width:177px" %)AT+TRIG1=2,50
38 -|(% style="width:179px" %)AT+TRIG2=2,50|(% style="width:177px" %)AT+TRIG2=2,50
39 -|(% style="width:179px" %)AT+DI1TODO1=2|(% style="width:177px" %)AT+DI1TODO1=2
40 -|(% style="width:179px" %)AT+DI1TORO1=2|(% style="width:177px" %)AT+DI1TORO1=2
41 -|(% style="width:179px" %)AT+DI2TODO2=2 |(% style="width:177px" %)AT+DI2TODO2=2
42 -|(% style="width:179px" %)AT+DI2TORO2=2|(% style="width:177px" %)AT+DI2TORO2=2
30 +(% border="1" style="background-color:#f7faff; color:black; width:500px" %)
31 +|=**A's configuration**|=**B's configuration**
32 +|AT+GROUPMOD=0|AT+GROUPMOD=0
33 +|AT+TXCHS=868700000|AT+TXCHS=869000000
34 +|AT+RXCHS=869000000|AT+RXCHS=868700000
35 +|AT+TRIG1=2,50|AT+TRIG1=2,50
36 +|AT+TRIG2=2,50|AT+TRIG2=2,50
37 +|AT+DI1TODO1=2|AT+DI1TODO1=2
38 +|AT+DI1TORO1=2|AT+DI1TORO1=2
39 +|AT+DI2TODO2=2 |AT+DI2TODO2=2
40 +|AT+DI2TORO2=2|AT+DI2TORO2=2
43 43  
44 -=== 2.2.3 Serial port display ===
45 45  
46 46  
44 +=== **2.2.3 Serial port display** ===
45 +
46 +
47 47  (% class="wikigeneratedid" %)
48 48  [[image:image-20220602111219-2.png]]
49 49  
... ... @@ -51,23 +51,22 @@
51 51  (% class="wikigeneratedid" %)
52 52  [[image:image-20220602111219-3.png]]
53 53  
54 -
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  
58 58  
59 -== 2.2  Point To Mult-Point ==
58 +== **2.2  Point To Mult-Point ** ==
60 60  
61 -=== 2.2.1 Overview ===
60 +=== **2.2.1 Overview** ===
62 62  
63 63  
64 64  [[image:1654152390874-192.png]]
65 65  
66 66  
67 -=== 2.2.2  Configure ===
66 +=== **2.2.2  Configure** ===
68 68  
69 69  
70 -(% style="color:blue" %)**Configuration of the TX group:**
69 +(% style="color:#4f81bd" %)**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:blue" %)**Configuration for RX group number 1:**
90 +(% style="color:#4f81bd" %)**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:blue" %)**Configuration for RX group number 2:**
99 +(% style="color:#4f81bd" %)**Configuration for RX group number 2:**
101 101  
102 102  AT+GROUPMOD=1,2
103 103  
... ... @@ -106,7 +106,7 @@
106 106  AT+RXCHS=868700000
107 107  
108 108  
109 -=== 2.2.3 Serial port display ===
108 +=== **2.2.3 Serial port display** ===
110 110  
111 111  
112 112  [[image:image-20220602144747-1.png]]
... ... @@ -114,15 +114,16 @@
114 114  
115 115  [[image:image-20220602144747-2.png]]
116 116  
117 -
118 118  (((
119 119  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.
120 120  )))
121 121  
122 122  
123 -== 2.3 AT command ==
124 124  
125 125  
123 +== **2.3 AT command** ==
124 +
125 +
126 126  (((
127 127  (% style="color:#037691" %)**ATZ** (%%)**: ** Trig a reset of the MCU
128 128  )))
... ... @@ -221,18 +221,28 @@
221 221  (% style="color:#037691" %)**AT+DI2TORO2 **(%%)**:    **Set or get the mode in which DI2 maps to RO2(default 0)
222 222  )))
223 223  
224 +(((
225 +
226 +)))
224 224  
225 225  (((
226 -(% style="color:blue" %)**Example 1:**
229 +
227 227  )))
228 228  
229 229  (((
233 +(% style="color:#4f81bd" %)**Example 1:**
234 +)))
235 +
236 +(((
230 230  **AT+SEND=01020304 **will send a payload of 01020304
231 231  )))
232 232  
240 +(((
241 +
242 +)))
233 233  
234 234  (((
235 -(% style="color:blue" %)**Example 2: **
245 +(% style="color:#4f81bd" %)**Example 2: **
236 236  )))
237 237  
238 238  (((
... ... @@ -244,28 +244,31 @@
244 244  )))
245 245  
246 246  (((
247 -**a=0:** falling edge;
257 +a=0: falling edge;
248 248  )))
249 249  
250 250  (((
251 -**a=1: **rising edge;
261 +a=1: rising edge;
252 252  )))
253 253  
254 254  (((
255 -**a=2:** falling edge or rising edge;
265 +a=2: falling edge or rising edge;
256 256  )))
257 257  
258 258  (((
259 -**b:**  triggering time in milliseconds.
269 +b:  triggering time in milliseconds.
260 260  )))
261 261  
262 262  (((
263 -**AT+TRIGx=2,50**  Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
273 +AT+TRIGx=2,50  Falling edge or rising edge trigger, and the trigger time exceeds 50ms.
264 264  )))
265 265  
276 +(((
277 +
278 +)))
266 266  
267 267  (((
268 -(% style="color:blue" %)**Example 3: **
281 +(% style="color:#4f81bd" %)**Example 3: **
269 269  )))
270 270  
271 271  (((
... ... @@ -288,12 +288,12 @@
288 288  
289 289  )))
290 290  
291 -(% border="1" style="background-color:#f7faff; color:black; width:690px" %)
304 +(% border="1" style="background-color:#f7faff; color:black; width:706px" %)
292 292  |=(% style="width: 102px;" %)(((
293 293  Maps value
294 294  )))|=(% style="width: 331px;" %)(((
295 295  DIx to DOx
296 -)))|=(% style="width: 251px;" %)(((
309 +)))|=(% style="width: 268px;" %)(((
297 297  DIx to ROx
298 298  )))
299 299  |(% style="width:102px" %)(((
... ... @@ -300,7 +300,7 @@
300 300  0
301 301  )))|(% style="width:331px" %)(((
302 302  No Action
303 -)))|(% style="width:251px" %)(((
316 +)))|(% style="width:268px" %)(((
304 304  No Action
305 305  )))
306 306  |(% style="width:102px" %)(((
... ... @@ -307,7 +307,7 @@
307 307  1
308 308  )))|(% style="width:331px" %)(((
309 309  If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level
310 -)))|(% style="width:251px" %)(((
323 +)))|(% style="width:268px" %)(((
311 311  (((
312 312  If DIx is high, control ROx to close,
313 313  )))
... ... @@ -320,7 +320,7 @@
320 320  2
321 321  )))|(% style="width:331px" %)(((
322 322  If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level
323 -)))|(% style="width:251px" %)(((
336 +)))|(% style="width:268px" %)(((
324 324  (((
325 325  If DIx is high, control ROx to open,
326 326  )))
... ... @@ -333,14 +333,12 @@
333 333  3
334 334  )))|(% style="width:331px" %)(((
335 335  DOx state flip
336 -)))|(% style="width:251px" %)(((
349 +)))|(% style="width:268px" %)(((
337 337  ROx state flip
338 338  )))
339 339  
340 340  (((
341 -
342 -
343 -(% style="color:blue" %)**Example 4: **
354 +(% style="color:#4f81bd" %)**Example 4: **
344 344  )))
345 345  
346 346  (((
... ... @@ -352,8 +352,10 @@
352 352  )))
353 353  
354 354  (((
366 +(((
355 355  **AT+GROUPMOD=1,bb**  Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8)
356 356  )))
369 +)))
357 357  
358 358  (((
359 359  **AT+GROUPMOD=0,2**  Set to control the TX group of the two RX groups
... ... @@ -368,285 +368,73 @@
368 368  )))
369 369  
370 370  
371 -=== 2.3.1 TRIG command is configured in the transmit LT. (LT1)(Since firmware 1.3.2) ===
384 +== **2.4 Data Format** ==
372 372  
373 -
374 -**AT+TRIGx=a          **Trigger transmit directly without triggering time
375 -
376 -**AT+TRIGx=a,b**  Trigger transmit with triggering time threshold
377 -
378 -**AT+TRIGx=a,b,c    **Trigger transmit with triggering time threshold, and continue to transmit every xx seconds if DI status no change.
379 -
380 -
381 -**a=0:** falling edge;
382 -
383 -**a=1:** rising edge;
384 -
385 -**a=2:** falling edge or rising edge;
386 -
387 -**b:**  triggering time in milliseconds.
388 -
389 -**c:** transmit interval
390 -
391 -
392 -(% 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)
393 -
394 -**Command:**
395 -
396 -**AT+TRIG1=2,50**  Falling edge or rising edge trigger, and the trigger time should exceed 50ms.
397 -
398 -
399 -(% style="color:blue" %)**Use Case 2:  **(%%)Sync LT2 RO / DO status with LT1 every minute.
400 -
401 -**Command:**
402 -
403 -**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. After power off, power on, LT1 will send trigger without falling/rising edge, so the DI changes during power off will be sync as well.
404 -
405 -
406 -=== 2.3.2 RO/DO is configured in the receiver LT (LT2)(Since firmware 1.3.2) ===
407 -
408 -
409 -AT+DI1TODO1= maps value[,latch time, timeout_state]
410 -
411 -AT+DI1TORO1= maps value[,latch time, timeout_state]
412 -
413 -AT+DI2TODO2= maps value[,latch time, timeout_state]
414 -
415 -AT+DI2TORO2= maps value[,latch time, timeout_state]
416 -
417 -
418 -(% border="1" style="background-color:#f7faff; color:black; width:774px" %)
419 -|(% style="width:105px" %) **Maps value**|(% style="width:415px" %)**DIx to DOx**|(% style="width:249px" %)**DIx to ROx**
420 -|(% style="width:105px" %)0|(% style="width:415px" %)No Action|(% style="width:249px" %)No Action
421 -|(% style="width:105px" %)1|(% style="width:415px" %)If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level|(% style="width:249px" %)(((
422 -If DIx is high, control ROx to close,
423 -
424 -if DIx is low, control ROx to open
386 +(((
387 +8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
425 425  )))
426 -|(% style="width:105px" %)2|(% style="width:415px" %)If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level|(% style="width:249px" %)(((
427 -If DIx is high, control ROx to open,
428 428  
429 -if DIx is low, control ROx to close
430 -)))
431 -|(% style="width:105px" %)3|(% style="width:415px" %)DOx state flip|(% style="width:249px" %)ROx state flip
432 -
433 -**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.
434 -
435 -
436 -**Timeout_State**:
437 -
438 -0: **No change** after timeout
439 -
440 -1: Change to **DO:0** or **RO: Open** after timeout
441 -
442 -2: Change to **DO:1** or **RO: Close** after timeout
443 -
444 -3: Change **back to state** before last trigger arrive.
445 -
446 -
447 -(% style="color:blue" %)**Case1**:
448 -
449 -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.
450 -
451 -
452 -(% style="color:blue" %)**Case2**:
453 -
454 -AT+DI1TODO1=1,60,1  ~/~/ LT2 DO1 will follow LT1 DI1 trigger command, DO1 will keep the status 60 seconds and then change to open.
455 -
456 -
457 -=== 2.3.3 Save the RO/DO status during power off(Since firmware 1.3) ===
458 -
459 -
460 -Enable/Disbale retain Digital Output/Relay Output after power off / Power On
461 -
462 -**AT+DOROSAVE=0**  ~/~/ Disable Retain after power off/on
463 -
464 -**AT+DOROSAVE=1**  ~/~/ Enable Retain after power off/on
465 -
466 -**AT+DOROSAVE=2,a,b,c,d**  ~/~/ set DO/RO port to default state after power on.
467 -
468 -**a: **for DO1
469 -
470 -**b:** for DO2
471 -
472 -**c: **for RO1
473 -
474 -**d:** for RO2.
475 -
476 -
477 -**Example:**
478 -
479 -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.
480 -
481 -
482 -=== 2.3.4 Control Sleep status.(Since firmware 1.3) ===
483 -
484 -
485 -DI2 can be used to set LT into sleep mode.
486 -
487 -**AT+DI2SLEEP=1**  ~/~/  Enable DI2 as Sleep pin
488 -
489 -**AT+DI2SLEEP=0**  ~/~/  Disable DI2 as Sleep pin
490 -
491 -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.
492 -
493 -In sleep mode, DORO will keep its initial state if AT+DOROSAVE=2, otherwise DORO will be in OFF state
494 -
495 -
496 -== 2.4 Data Format ==
497 -
498 -
499 499  (((
500 -8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum
391 +
501 501  )))
502 502  
503 503  (((
504 -(% style="color:blue" %)**Payload:Payload triggered by TDC or DI**
395 +(% style="color:#4f81bd" %)**Payload:**
505 505  )))
506 506  
507 -(% border="1" style="background-color:#f7faff; color:black; width:825px" %)
508 -|=(% style="width: 102px;" %)(((
398 +(% border="1" style="background-color:#f7faff; color:black; width:938px" %)
399 +|=(% style="width: 123px;" %)(((
509 509  **Size (bytes)**
510 -)))|=(% style="width: 74px;" %)(((
401 +)))|=(% style="width: 107px;" %)(((
511 511  1
512 -)))|=(% style="width: 72px;" %)(((
403 +)))|=(% style="width: 107px;" %)(((
513 513  1
514 -)))|=(% style="width: 47px;" %)(((
405 +)))|=(% style="width: 107px;" %)(((
515 515  1
516 -)))|=(% style="width: 83px;" %)(((
407 +)))|=(% style="width: 107px;" %)(((
517 517  1
518 -)))|=(% style="width: 90px;" %)(((
409 +)))|=(% style="width: 107px;" %)(((
519 519  1
520 -)))|=(% style="width: 92px;" %)(((
411 +)))|=(% style="width: 107px;" %)(((
521 521  1
522 -)))|=(% style="width: 78px;" %)(((
413 +)))|=(% style="width: 107px;" %)(((
523 523  1
524 -)))|=(% style="width: 91px;" %)(((
415 +)))|=(% style="width: 107px;" %)(((
525 525  1
526 -)))|=(% style="width: 91px;" %)(((
417 +)))|=(% style="width: 107px;" %)(((
527 527  1
528 528  )))
529 -|(% style="width:102px" %)(((
420 +|(% style="width:123px" %)(((
530 530  **Value**
531 -)))|(% style="width:74px" %)(((
422 +)))|(% style="width:38px" %)(((
532 532  address
533 -)))|(% style="width:72px" %)(((
424 +)))|(% style="width:70px" %)(((
534 534  request
535 -)))|(% style="width:47px" %)(((
426 +)))|(% style="width:52px" %)(((
536 536  ACK
537 -)))|(% style="width:83px" %)(((
428 +)))|(% style="width:127px" %)(((
538 538  (((
539 539  DI1&
431 +)))
432 +
433 +(((
540 540  DI1 level
541 541  )))
542 -)))|(% style="width:90px" %)(((
436 +)))|(% style="width:101px" %)(((
543 543  DI1TODO1
544 -)))|(% style="width:92px" %)(((
438 +)))|(% style="width:91px" %)(((
545 545  DI1TORO1
546 -)))|(% style="width:78px" %)(((
440 +)))|(% style="width:111px" %)(((
547 547  (((
548 548  DI2&
549 -DI2 leve
550 550  )))
551 -)))|(% style="width:91px" %)(((
552 -DI2TODO2
553 -)))|(% style="width:91px" %)(((
554 -DI2TORO2
555 -)))
556 556  
557 557  (((
558 -(% style="color:#037691" %)**The first byte**(%%)**:**  00 is the broadcast address, 01-08 is the RX group number.
446 +DI2 level
559 559  )))
560 -
561 -(((
562 -(% style="color:#037691" %)**The second byte**(%%)**:**  send mapping request when not 0, not request when it is 0.
563 -)))
564 -
565 -(((
566 -(% style="color:#037691" %)**The third byte**(%%)**:**  ACK returned to the sender after the mapping is completed.
567 -)))
568 -
569 -(((
570 -(((
571 -(% 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.
572 -)))
573 -)))
574 -
575 -(((
576 -(% style="color:#037691" %)**The Fifth byte**(%%)**:       **DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered.
577 -)))
578 -
579 -(((
580 -(% style="color:#037691" %)**The Sixth byte**(%%)**:**  0 does not trigger interrupt when DI1TORO1 interrupt is triggered.
581 -)))
582 -
583 -(((
584 -(((
585 -(% 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.
586 -)))
587 -)))
588 -
589 -(((
590 -(% style="color:#037691" %)**The 8th byte**(%%)**:          **DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered.
591 -)))
592 -
593 -(((
594 -(% style="color:#037691" %)**The 9th byte**(%%)**:**  DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered.
595 -)))
596 -
597 -(((
598 -
599 -
600 -(% style="color:blue" %)**Payload:（Since firmware 1.3）The receiver replies to the sent packet**
601 -)))
602 -
603 -(% border="1" style="background-color:#f7faff; color:black; width:822px" %)
604 -|=(% style="width: 97px;" %)(((
605 -**Size(bytes)**
606 -)))|=(% style="width: 71px;" %)(((
607 -1
608 -)))|=(% style="width: 70px;" %)(((
609 -1
610 -)))|=(% style="width: 48px;" %)(((
611 -1
612 -)))|=(% style="width: 85px;" %)(((
613 -1
614 -)))|=(% style="width: 90px;" %)(((
615 -1
616 -)))|=(% style="width: 88px;" %)(((
617 -1
618 -)))|=(% style="width: 86px;" %)(((
619 -1
620 -)))|=(% style="width: 92px;" %)(((
621 -1
622 -)))|=(% style="width: 92px;" %)(((
623 -1
624 -)))
625 -|(% style="width:97px" %)(((
626 -**Value**
627 -)))|(% style="width:71px" %)(((
628 -address
629 -)))|(% style="width:70px" %)(((
630 -request
631 -)))|(% style="width:48px" %)(((
632 -ACK
633 -)))|(% style="width:85px" %)(((
634 -(((
635 -DOI1&
636 -DOI2 level
637 -)))
638 -)))|(% style="width:90px" %)(((
639 -DI1TODO1
640 -)))|(% style="width:88px" %)(((
641 -DI1TORO1
642 -)))|(% style="width:86px" %)(((
643 -(((
644 -RO2&
645 -RO2 level
646 -)))
647 -)))|(% style="width:92px" %)(((
448 +)))|(% style="width:105px" %)(((
648 648  DI2TODO2
649 -)))|(% style="width:92px" %)(((
450 +)))|(% style="width:106px" %)(((
650 650  DI2TORO2
651 651  )))
652 652  
... ... @@ -664,7 +664,7 @@
664 664  
665 665  (((
666 666  (((
667 -(% style="color:#037691" %)**The fourth byte**(%%)**:**  the high four bits are 1 to represent DOI1, and the low four bits are the level of DOI2 when the interrupt is triggered.
468 +(% 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.
668 668  )))
669 669  )))
670 670  
... ... @@ -678,7 +678,7 @@
678 678  
679 679  (((
680 680  (((
681 -(% 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.
482 +(% 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.
682 682  )))
683 683  )))
684 684  

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