Changes for page Point to Point Communication of LT-22222-L
Last modified by Edwin Chen on 2022/11/22 09:38
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... ... @@ -1,4 +1,4 @@ 1 -** Table ofContents: **1 +**Contents: ** 2 2 3 3 {{toc/}} 4 4 ... ... @@ -5,46 +5,43 @@ 5 5 6 6 7 7 8 -= 1. Overview = 8 += **1. Overview** = 9 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: 14 14 ))) 15 15 16 16 ((( 17 - [[LT22222-L_PingPong_Software>>https://github.com/dragino/LT-22222-L]] 18 - 19 - 15 +[[Point to Point Software for LT-22222-L>>https://github.com/dragino/LT-22222-L]]. 20 20 ))) 21 21 22 -= 2. Features for this firmware = 23 23 24 -= =2.1PointToPoint ==19 += **2. Features for this firmware** = 25 25 26 -== =2.1.1Overview===21 +== **2.1 Point To Point** == 27 27 23 +=== **2.1.1 Overview** === 28 28 25 + 29 29 [[image:image-20220602111219-1.png||height="472" width="972"]] 30 30 31 31 32 -=== 2.2.2 Configure === 29 +=== **2.2.2 Configure** === 33 33 34 34 35 -(% border="1" style="background-color:#f7faff; color:black; width: 360px" %)36 -|= (% style="width: 179px;" %)**A's configuration**|=(% style="width: 177px;" %)**B's configuration**37 -| (% style="width:179px" %)AT+GROUPMOD=0|(% style="width:177px" %)AT+GROUPMOD=038 -| (% style="width:179px" %)AT+TXCHS=868700000|(% style="width:177px" %)AT+TXCHS=86900000039 -| (% style="width:179px" %)AT+RXCHS=869000000|(% style="width:177px" %)AT+RXCHS=86870000040 -| (% style="width:179px" %)AT+TRIG1=2,50|(% style="width:177px" %)AT+TRIG1=2,5041 -| (% style="width:179px" %)AT+TRIG2=2,50|(% style="width:177px" %)AT+TRIG2=2,5042 -| (% style="width:179px" %)AT+DI1TODO1=2|(% style="width:177px" %)AT+DI1TODO1=243 -| (% style="width:179px" %)AT+DI1TORO1=2|(% style="width:177px" %)AT+DI1TORO1=244 -| (% style="width:179px" %)AT+DI2TODO2=2 |(% style="width:177px" %)AT+DI2TODO2=245 -| (% style="width:179px" %)AT+DI2TORO2=2|(% style="width:177px" %)AT+DI2TORO2=232 +(% border="1" style="background-color:#f7faff; color:black; width:500px" %) 33 +|=**A's configuration**|=**B's configuration** 34 +|AT+GROUPMOD=0|AT+GROUPMOD=0 35 +|AT+TXCHS=868700000|AT+TXCHS=869000000 36 +|AT+RXCHS=869000000|AT+RXCHS=868700000 37 +|AT+TRIG1=2,50|AT+TRIG1=2,50 38 +|AT+TRIG2=2,50|AT+TRIG2=2,50 39 +|AT+DI1TODO1=2|AT+DI1TODO1=2 40 +|AT+DI1TORO1=2|AT+DI1TORO1=2 41 +|AT+DI2TODO2=2 |AT+DI2TODO2=2 42 +|AT+DI2TORO2=2|AT+DI2TORO2=2 46 46 47 -=== 2.2.3 Serial port display === 44 +=== **2.2.3 Serial port display** === 48 48 49 49 50 50 (% class="wikigeneratedid" %) ... ... @@ -54,23 +54,22 @@ 54 54 (% class="wikigeneratedid" %) 55 55 [[image:image-20220602111219-3.png]] 56 56 57 - 58 58 (% class="wikigeneratedid" %) 59 59 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. 60 60 61 61 62 -== 2.2 Point To Mult-Point == 58 +== **2.2 Point To Mult-Point ** == 63 63 64 -=== 2.2.1 Overview === 60 +=== **2.2.1 Overview** === 65 65 66 66 67 67 [[image:1654152390874-192.png]] 68 68 69 69 70 -=== 2.2.2 Configure === 66 +=== **2.2.2 Configure** === 71 71 72 72 73 -(% style="color:b lue" %)**Configuration of the TX group:**69 +(% style="color:#4f81bd" %)**Configuration of the TX group:** 74 74 75 75 AT+GROUPMOD=0,2 76 76 ... ... @@ -91,7 +91,7 @@ 91 91 AT+DI2TORO2=1 92 92 93 93 94 -(% style="color:b lue" %)**Configuration for RX group number 1:**90 +(% style="color:#4f81bd" %)**Configuration for RX group number 1:** 95 95 96 96 AT+GROUPMOD=1,1 97 97 ... ... @@ -100,7 +100,7 @@ 100 100 AT+RXCHS=868700000 101 101 102 102 103 -(% style="color:b lue" %)**Configuration for RX group number 2:**99 +(% style="color:#4f81bd" %)**Configuration for RX group number 2:** 104 104 105 105 AT+GROUPMOD=1,2 106 106 ... ... @@ -109,7 +109,7 @@ 109 109 AT+RXCHS=868700000 110 110 111 111 112 -=== 2.2.3 Serial port display === 108 +=== **2.2.3 Serial port display** === 113 113 114 114 115 115 [[image:image-20220602144747-1.png]] ... ... @@ -117,13 +117,12 @@ 117 117 118 118 [[image:image-20220602144747-2.png]] 119 119 120 - 121 121 ((( 122 122 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. 123 123 ))) 124 124 125 125 126 -== 2.3 AT command == 121 +== **2.3 AT command** == 127 127 128 128 129 129 ((( ... ... @@ -224,18 +224,28 @@ 224 224 (% style="color:#037691" %)**AT+DI2TORO2 **(%%)**: **Set or get the mode in which DI2 maps to RO2(default 0) 225 225 ))) 226 226 222 +((( 223 + 224 +))) 227 227 228 228 ((( 229 - (%style="color:blue" %)**Example 1:**227 + 230 230 ))) 231 231 232 232 ((( 231 +(% style="color:#4f81bd" %)**Example 1:** 232 +))) 233 + 234 +((( 233 233 **AT+SEND=01020304 **will send a payload of 01020304 234 234 ))) 235 235 238 +((( 239 + 240 +))) 236 236 237 237 ((( 238 -(% style="color:b lue" %)**Example 2: **243 +(% style="color:#4f81bd" %)**Example 2: ** 239 239 ))) 240 240 241 241 ((( ... ... @@ -247,28 +247,31 @@ 247 247 ))) 248 248 249 249 ((( 250 - **a=0:**falling edge;255 +a=0: falling edge; 251 251 ))) 252 252 253 253 ((( 254 - **a=1:**rising edge;259 +a=1: rising edge; 255 255 ))) 256 256 257 257 ((( 258 - **a=2:**falling edge or rising edge;263 +a=2: falling edge or rising edge; 259 259 ))) 260 260 261 261 ((( 262 - **b:**triggering time in milliseconds.267 +b: triggering time in milliseconds. 263 263 ))) 264 264 265 265 ((( 266 - **AT+TRIGx=2,50**271 +AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms. 267 267 ))) 268 268 274 +((( 275 + 276 +))) 269 269 270 270 ((( 271 -(% style="color:b lue" %)**Example 3: **279 +(% style="color:#4f81bd" %)**Example 3: ** 272 272 ))) 273 273 274 274 ((( ... ... @@ -291,12 +291,12 @@ 291 291 292 292 ))) 293 293 294 -(% border="1" style="background-color:#f7faff; color:black; width: 690px" %)302 +(% border="1" style="background-color:#f7faff; color:black; width:706px" %) 295 295 |=(% style="width: 102px;" %)((( 296 296 Maps value 297 297 )))|=(% style="width: 331px;" %)((( 298 298 DIx to DOx 299 -)))|=(% style="width: 2 51px;" %)(((307 +)))|=(% style="width: 268px;" %)((( 300 300 DIx to ROx 301 301 ))) 302 302 |(% style="width:102px" %)((( ... ... @@ -303,7 +303,7 @@ 303 303 0 304 304 )))|(% style="width:331px" %)((( 305 305 No Action 306 -)))|(% style="width:2 51px" %)(((314 +)))|(% style="width:268px" %)((( 307 307 No Action 308 308 ))) 309 309 |(% style="width:102px" %)((( ... ... @@ -310,7 +310,7 @@ 310 310 1 311 311 )))|(% style="width:331px" %)((( 312 312 If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level 313 -)))|(% style="width:2 51px" %)(((321 +)))|(% style="width:268px" %)((( 314 314 ((( 315 315 If DIx is high, control ROx to close, 316 316 ))) ... ... @@ -323,7 +323,7 @@ 323 323 2 324 324 )))|(% style="width:331px" %)((( 325 325 If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level 326 -)))|(% style="width:2 51px" %)(((334 +)))|(% style="width:268px" %)((( 327 327 ((( 328 328 If DIx is high, control ROx to open, 329 329 ))) ... ... @@ -336,14 +336,12 @@ 336 336 3 337 337 )))|(% style="width:331px" %)((( 338 338 DOx state flip 339 -)))|(% style="width:2 51px" %)(((347 +)))|(% style="width:268px" %)((( 340 340 ROx state flip 341 341 ))) 342 342 343 343 ((( 344 - 345 - 346 -(% style="color:blue" %)**Example 4: ** 352 +(% style="color:#4f81bd" %)**Example 4: ** 347 347 ))) 348 348 349 349 ((( ... ... @@ -355,8 +355,10 @@ 355 355 ))) 356 356 357 357 ((( 364 +((( 358 358 **AT+GROUPMOD=1,bb** Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8) 359 359 ))) 367 +))) 360 360 361 361 ((( 362 362 **AT+GROUPMOD=0,2** Set to control the TX group of the two RX groups ... ... @@ -368,47 +368,45 @@ 368 368 369 369 ((( 370 370 **AT+GROUPMOD=1,2** Set the RX group numbered 2 371 -))) 372 372 373 373 374 374 === 2.3.1 TRIG command is configured in the transmit LT. (LT1)(Since firmware 1.3) === 382 +))) 375 375 384 +**AT+TRIGx=a **Trigger transmit directly without triggering time 376 376 377 -**AT+TRIGx=a directlywithouttriggering time386 +**AT+TRIGx=a,b** Trigger transmit with triggering time threshold 378 378 379 -**AT+TRIGx=a,b** 388 +**AT+TRIGx=a,b,c **Trigger transmit with triggering time threshold, and continue to transmit every xx seconds if DI status no change. 380 380 381 -**AT+TRIGx=a,b,c **Trigger transmit with triggering time threshold, and continue to transmit every xx seconds if DI status no change. 382 382 391 +a=0: falling edge; 383 383 384 - **a=0:**falling edge;393 +a=1: rising edge; 385 385 386 - **a=1:**rising edge;395 +a=2: falling edge or rising edge; 387 387 388 - **a=2:**fallingedgeorrisingedge;397 +b: triggering time in milliseconds. 389 389 390 - **b:**triggering timeinmilliseconds.399 +c: transmit interval 391 391 392 -**c:** transmit interval 393 393 402 +**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) 394 394 395 - (% style="color:blue" %)**UseCase 1**(%%): Once the DI1 port status change ( either from low to high or high to low, LT1 sends a trigger to LT-2)404 +Command: 396 396 397 - **Command:**406 +AT+TRIG1=2,50 Falling edge or rising edge trigger, and the trigger time should exceed 50ms. 398 398 399 -**AT+TRIG1=2,50** Falling edge or rising edge trigger, and the trigger time should exceed 50ms. 400 400 409 +**Use Case 2: **Sync LT2 RO / DO status with LT1 every minute. 401 401 402 - (% style="color:blue" %)**UseCase 2: **(%%)Sync LT2 RO / DO status with LT1 every minute.411 +Command: 403 403 404 - **Command:**413 +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. 405 405 406 -**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. 407 407 408 - 409 409 === 2.3.2 RO/DO is configured in the receiver LT (LT2)(Since firmware 1.3) === 410 410 411 - 412 412 AT+DI1TODO1= maps value[,latch time] 413 413 414 414 AT+DI1TORO1= maps value[,latch time] ... ... @@ -418,131 +418,135 @@ 418 418 AT+DI2TORO2= maps value[,latch time] 419 419 420 420 421 -(% border="1" style="background-color:#f7faff; color:black; width:7 74px" %)422 -| (%style="width:105px" %)**Maps value**|(% style="width:415px" %)**DIx to DOx**|(% style="width:249px" %)**DIx to ROx**423 -| (% style="width:105px" %)0|(% style="width:415px" %)No Action|(% style="width:249px" %)No Action424 -| (% 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" %)(((427 +(% border="1" style="background-color:#f7faff; color:black; width:706px" %) 428 +| **Maps value**|DIx to DOx|DIx to ROx 429 +|0|No Action|No Action 430 +|1|If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level|((( 425 425 If DIx is high, control ROx to close, 426 426 427 427 if DIx is low, control ROx to open 428 428 ))) 429 -| (% 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" %)(((435 +|2|If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level|((( 430 430 If DIx is high, control ROx to open, 431 431 432 432 if DIx is low, control ROx to close 433 433 ))) 434 -| (% style="width:105px" %)3|(% style="width:415px" %)DOx state flip|(% style="width:249px" %)ROx state flip440 +|3|DOx state flip|ROx state flip 435 435 436 436 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. 437 437 438 438 439 - (% style="color:blue" %)**Case1**:445 +**Case1**: 440 440 441 -AT+DI1TODO1=1 447 +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. 442 442 443 443 444 - (% style="color:blue" %)**Case2**:450 +**Case2**: 445 445 446 -AT+DI1TODO1=1,60 452 +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. 447 447 448 448 449 449 === 2.3.3 Save the RO/DO status during power off(Since firmware 1.3) === 450 450 451 - 452 452 Enable/Disbale retain Digital Output/Relay Output after power off / Power On 453 453 454 - **AT+DOROSAVE=0**459 +AT+DOROSAVE=0 ~/~/ Disable Retain after power off/on 455 455 456 - **AT+DOROSAVE=1**461 +AT+DOROSAVE=1 ~/~/ Enable Retain after power off/on 457 457 458 - **AT+DOROSAVE=2,a,b,c,d**463 +AT+DOROSAVE=2,a,b,c,d ~/~/ set DO/RO port to default state after power on. 459 459 460 - **a:**for DO1465 +a: for DO1 461 461 462 - **b:**for DO2467 +b: for DO2 463 463 464 - **c:**for RO1469 +c: for RO1 465 465 466 - **d:**for RO2.471 +d: for RO2. 467 467 473 +Example: 468 468 469 - **Example:**475 +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. 470 470 471 -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. 472 472 473 - 474 474 === 2.3.4 Control Sleep status.(Since firmware 1.3) === 475 475 476 - 477 477 DI2 can be used to set LT into sleep mode. 478 478 479 - **AT+DI2SLEEP=1**482 +AT+DI2SLEEP=1 ~/~/Enable DI2 as Sleep pin 480 480 481 - **AT+DI2SLEEP=0**484 +AT+DI2SLEEP=0 ~/~/Disable DI2 as Sleep pin 482 482 483 483 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. 484 484 485 -In sleep mode, DORO will keep its initial state if AT+DOROSAVE=2, otherwise DORO will be in OFF state 486 486 489 +== **2.4 Data Format** == 487 487 488 -== 2.4 Data Format == 489 - 490 - 491 491 ((( 492 492 8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum 493 493 ))) 494 494 495 495 ((( 496 - (%style="color:blue" %)**Payload:Payload triggered by TDC or DI**496 + 497 497 ))) 498 498 499 -(% border="1" style="background-color:#f7faff; color:black; width:825px" %) 500 -|=(% style="width: 102px;" %)((( 499 +((( 500 +(% style="color:#4f81bd" %)**Payload:** 501 +))) 502 + 503 +(% border="1" style="background-color:#f7faff; color:black; width:938px" %) 504 +|=(% style="width: 123px;" %)((( 501 501 **Size (bytes)** 502 -)))|=(% style="width: 7 4px;" %)(((506 +)))|=(% style="width: 107px;" %)((( 503 503 1 504 -)))|=(% style="width: 7 2px;" %)(((508 +)))|=(% style="width: 107px;" %)((( 505 505 1 506 -)))|=(% style="width: 47px;" %)(((510 +)))|=(% style="width: 107px;" %)((( 507 507 1 508 -)))|=(% style="width: 83px;" %)(((512 +)))|=(% style="width: 107px;" %)((( 509 509 1 510 -)))|=(% style="width: 90px;" %)(((514 +)))|=(% style="width: 107px;" %)((( 511 511 1 512 -)))|=(% style="width: 92px;" %)(((516 +)))|=(% style="width: 107px;" %)((( 513 513 1 514 -)))|=(% style="width: 7 8px;" %)(((518 +)))|=(% style="width: 107px;" %)((( 515 515 1 516 -)))|=(% style="width: 91px;" %)(((520 +)))|=(% style="width: 107px;" %)((( 517 517 1 518 -)))|=(% style="width: 91px;" %)(((522 +)))|=(% style="width: 107px;" %)((( 519 519 1 520 520 ))) 521 -|(% style="width:1 02px" %)(((525 +|(% style="width:123px" %)((( 522 522 **Value** 523 -)))|(% style="width: 74px" %)(((527 +)))|(% style="width:38px" %)((( 524 524 address 525 -)))|(% style="width:7 2px" %)(((529 +)))|(% style="width:70px" %)((( 526 526 request 527 -)))|(% style="width: 47px" %)(((531 +)))|(% style="width:52px" %)((( 528 528 ACK 529 -)))|(% style="width: 83px" %)(((533 +)))|(% style="width:127px" %)((( 530 530 ((( 531 531 DI1& 536 +))) 537 + 538 +((( 532 532 DI1 level 533 533 ))) 534 -)))|(% style="width: 90px" %)(((541 +)))|(% style="width:101px" %)((( 535 535 DI1TODO1 536 -)))|(% style="width:9 2px" %)(((543 +)))|(% style="width:91px" %)((( 537 537 DI1TORO1 538 -)))|(% style="width: 78px" %)(((545 +)))|(% style="width:111px" %)((( 539 539 ((( 540 540 DI2& 541 -DI2 leve 542 542 ))) 543 -)))|(% style="width:91px" %)((( 549 + 550 +((( 551 +DI2 level 552 +))) 553 +)))|(% style="width:105px" %)((( 544 544 DI2TODO2 545 -)))|(% style="width: 91px" %)(((555 +)))|(% style="width:106px" %)((( 546 546 DI2TORO2 547 547 ))) 548 548 ... ... @@ -589,56 +589,62 @@ 589 589 ((( 590 590 591 591 592 -(% style="color:b lue" %)**Payload:(Since firmware 1.3)The receiver replies to the sent packet**602 +(% style="color:#4f81bd" %)**Payload:(Since firmware 1.3)The receiver replies to the sent packet** 593 593 ))) 594 594 595 -(% border="1" style="background-color:#f7faff; color:black; width:8 22px" %)596 -|=(% style="width: 97px;" %)(((597 -**Size(bytes)** 598 -)))|=(% style="width: 71px;" %)(((605 +(% border="1" style="background-color:#f7faff; color:black; width:938px" %) 606 +|=(% style="width: 123px;" %)((( 607 +**Size (bytes)** 608 +)))|=(% style="width: 107px;" %)((( 599 599 1 600 -)))|=(% style="width: 70px;" %)(((610 +)))|=(% style="width: 107px;" %)((( 601 601 1 602 -)))|=(% style="width: 48px;" %)(((612 +)))|=(% style="width: 107px;" %)((( 603 603 1 604 -)))|=(% style="width: 85px;" %)(((614 +)))|=(% style="width: 107px;" %)((( 605 605 1 606 -)))|=(% style="width: 90px;" %)(((616 +)))|=(% style="width: 107px;" %)((( 607 607 1 608 -)))|=(% style="width: 88px;" %)(((618 +)))|=(% style="width: 107px;" %)((( 609 609 1 610 -)))|=(% style="width: 86px;" %)(((620 +)))|=(% style="width: 107px;" %)((( 611 611 1 612 -)))|=(% style="width: 92px;" %)(((622 +)))|=(% style="width: 107px;" %)((( 613 613 1 614 -)))|=(% style="width: 92px;" %)(((624 +)))|=(% style="width: 107px;" %)((( 615 615 1 616 616 ))) 617 -|(% style="width: 97px" %)(((627 +|(% style="width:123px" %)((( 618 618 **Value** 619 -)))|(% style="width: 71px" %)(((629 +)))|(% style="width:38px" %)((( 620 620 address 621 621 )))|(% style="width:70px" %)((( 622 622 request 623 -)))|(% style="width: 48px" %)(((633 +)))|(% style="width:52px" %)((( 624 624 ACK 625 -)))|(% style="width: 85px" %)(((635 +)))|(% style="width:127px" %)((( 626 626 ((( 627 -DOI1& 628 -DOI2 level 637 +DO1& 629 629 ))) 630 -)))|(% style="width:90px" %)((( 639 + 640 +((( 641 +DO1 level 642 +))) 643 +)))|(% style="width:101px" %)((( 631 631 DI1TODO1 632 -)))|(% style="width: 88px" %)(((645 +)))|(% style="width:91px" %)((( 633 633 DI1TORO1 634 -)))|(% style="width: 86px" %)(((647 +)))|(% style="width:111px" %)((( 635 635 ((( 636 636 RO2& 650 +))) 651 + 652 +((( 637 637 RO2 level 638 638 ))) 639 -)))|(% style="width: 92px" %)(((655 +)))|(% style="width:105px" %)((( 640 640 DI2TODO2 641 -)))|(% style="width: 92px" %)(((657 +)))|(% style="width:106px" %)((( 642 642 DI2TORO2 643 643 ))) 644 644 ... ... @@ -656,7 +656,7 @@ 656 656 657 657 ((( 658 658 ((( 659 -(% style="color:#037691" %)**The fourth byte**(%%)**:** the high four bits are 1 to represent DO I1, and the low four bits are the level of DOI2when the interrupt is triggered.675 +(% 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. 660 660 ))) 661 661 ))) 662 662