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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... ... @@ -1,10 +1,15 @@ 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 ... ... @@ -12,20 +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 19 - 20 20 == **2.1 Point To Point** == 21 21 25 +=== **2.1.1 Overview** === 22 22 27 + 23 23 [[image:image-20220602111219-1.png||height="472" width="972"]] 24 24 25 25 26 -(% class="wikigeneratedid" id="H2.2.Configure" %) 27 -(% style="color:blue" %)**Configure:** 31 +=== **2.2.2 Configure** === 28 28 33 + 29 29 (% border="1" style="background-color:#f7faff; color:black; width:500px" %) 30 30 |=**A's configuration**|=**B's configuration** 31 31 |AT+GROUPMOD=0|AT+GROUPMOD=0 ... ... @@ -38,16 +38,83 @@ 38 38 |AT+DI2TODO2=2 |AT+DI2TODO2=2 39 39 |AT+DI2TORO2=2|AT+DI2TORO2=2 40 40 41 -== **2.2 Point To Mult-Point ** == 42 42 43 43 48 +=== **2.2.3 Serial port display** === 49 + 50 + 51 +(% class="wikigeneratedid" %) 44 44 [[image:image-20220602111219-2.png]] 45 45 46 46 55 +(% class="wikigeneratedid" %) 47 47 [[image:image-20220602111219-3.png]] 48 48 49 -((( 58 + 59 +(% class="wikigeneratedid" %) 50 50 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. 61 + 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. 51 51 ))) 52 52 53 53 ... ... @@ -54,162 +54,573 @@ 54 54 == **2.3 AT command** == 55 55 56 56 129 +((( 57 57 (% style="color:#037691" %)**ATZ** (%%)**: ** Trig a reset of the MCU 131 +))) 58 58 133 +((( 59 59 (% style="color:#037691" %)**AT+FDR** (%%)**:** Reset Parameters to Factory Default, Keys Reserve 135 +))) 60 60 137 +((( 61 61 (% style="color:#037691" %)**AT+FCU** (%%)**:** Get or Set the Frame Counter Uplink 139 +))) 62 62 141 +((( 63 63 (% style="color:#037691" %)**AT+FCD** (%%)**:** Get or Set the Frame Counter Downlink 143 +))) 64 64 145 +((( 65 65 (% style="color:#037691" %)**AT+TXP** (%%)**:** Get or Set the transmit power, the maximum is 20dBm (default is 14dBm) 147 +))) 66 66 149 +((( 67 67 (% style="color:#037691" %)**AT+SYNC** (%%)**:** Get or Set the Sync word [1:0x34,0:0x12] (default is 1) 151 +))) 68 68 153 +((( 69 69 (% style="color:#037691" %)**AT+PMB** (%%)**: **Get or Set the preamble (default:8) 155 +))) 70 70 157 +((( 71 71 (% style="color:#037691" %)**AT+TXCHS **(%%)**:** Get or Set the transmit frequency of TX (default:868700000) 159 +))) 72 72 161 +((( 73 73 (% style="color:#037691" %)**AT+TXSF **(%%)**:** Get or Set the spreading factor of TX (7 to 12) (default:12) 163 +))) 74 74 165 +((( 75 75 (% style="color:#037691" %)**AT+RXCHS **(%%)**:** Get or Set the transmit frequency of RX (default:869000000) 167 +))) 76 76 169 +((( 77 77 (% style="color:#037691" %)**AT+RXSF **(%%)**:** Get or Set the spreading factor of RX (7 to 12) (default:12) 171 +))) 78 78 173 +((( 79 79 (% style="color:#037691" %)**AT+BW **(%%)**: **Get or Set the bandwidth [0:125khz,1:250khz,2:500khz] (default:0) 175 +))) 80 80 177 +((( 81 81 (% 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 +))) 82 82 181 +((( 83 83 (% style="color:#037691" %)**AT+TDC **(%%)**:** Get or set the application data transmission interval in ms(default 10 minutes) 183 +))) 84 84 185 +((( 85 85 (% style="color:#037691" %)**AT+VER **(%%)**:** Get firmware version number 187 +))) 86 86 189 +((( 87 87 (% style="color:#037691" %)**AT+SEND **(%%)**: **Set Custom sent hex data 191 +))) 88 88 193 +((( 89 89 (% style="color:#037691" %)**AT+GROUPMOD **(%%)**: **Set or Get the grouping mode of the device (default: 0) 195 +))) 90 90 91 91 ((( 198 +((( 92 92 (% 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) 93 93 ))) 201 +))) 94 94 203 +((( 95 95 (% style="color:#037691" %)**AT+TRIG1 **(%%)**:** Set or Get the DI1 pin interrupt trigger mode (default 0,0) 205 +))) 96 96 207 +((( 97 97 (% style="color:#037691" %)**AT+TRIG2 **(%%)**: **Set or Get the DI2 pin interrupt trigger mode (default 0,0) 209 +))) 98 98 211 +((( 99 99 (% style="color:#037691" %)**AT+DI1TODO1 **(%%)**: **Set or get the mode in which DI1 maps to DO1 (default 0) 213 +))) 100 100 215 +((( 101 101 (% style="color:#037691" %)**AT+DI1TORO1 **(%%)**: **Set or get the mode in which DI1 maps to RO1(default 0) 217 +))) 102 102 219 +((( 103 103 (% style="color:#037691" %)**AT+DI2TODO2 **(%%)**:** Set or get the mode in which DI2 maps to DO2(default 0) 221 +))) 104 104 223 +((( 105 105 (% style="color:#037691" %)**AT+DI2TORO2 **(%%)**: **Set or get the mode in which DI2 maps to RO2(default 0) 225 +))) 106 106 107 107 108 108 229 +((( 109 109 (% style="color:#4f81bd" %)**Example 1:** 231 +))) 110 110 233 +((( 111 111 **AT+SEND=01020304 **will send a payload of 01020304 235 +))) 112 112 113 113 114 -(% style="color:#4f81bd" %)**Example 2: ** 115 115 239 +((( 240 +(% style="color:blue" %)**Example 2: ** 241 +))) 242 + 243 +((( 116 116 **AT+TRIGx=a **Trigger directly without triggering time 245 +))) 117 117 247 +((( 118 118 **AT+TRIGx=a,b** 249 +))) 119 119 251 +((( 120 120 a=0: falling edge; 253 +))) 121 121 255 +((( 122 122 a=1: rising edge; 257 +))) 123 123 259 +((( 124 124 a=2: falling edge or rising edge; 261 +))) 125 125 263 +((( 126 126 b: triggering time in milliseconds. 265 +))) 127 127 267 +((( 128 128 AT+TRIGx=2,50 Falling edge or rising edge trigger, and the trigger time exceeds 50ms. 269 +))) 129 129 130 130 131 -(% style="color:#4f81bd" %)**Example 3: ** 272 +((( 273 +(% style="color:blue" %)**Example 3: ** 274 +))) 132 132 276 +((( 133 133 **AT+DI1TODO1= maps value** 278 +))) 134 134 280 +((( 135 135 **AT+DI1TORO1= maps value** 282 +))) 136 136 284 +((( 137 137 **AT+DI2TODO2= maps value** 286 +))) 138 138 288 +((( 139 139 **AT+DI2TORO2= maps value** 290 +))) 140 140 292 +((( 293 + 294 +))) 141 141 142 142 (% border="1" style="background-color:#f7faff; color:black; width:706px" %) 143 -|=(% style="width: 102px;" %)Maps value|=(% style="width: 331px;" %)DIx to DOx|=(% style="width: 268px;" %)DIx to ROx 144 -|(% style="width:102px" %)0|(% style="width:331px" %)No Action|(% style="width:268px" %)No Action 145 -|(% style="width:102px" %)1|(% style="width:331px" %)If DIx is high, control DOx to output low level, If DIx is low, control DOx to output high level|(% style="width:268px" %)((( 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 +((( 146 146 If DIx is high, control ROx to close, 318 +))) 147 147 320 +((( 148 148 if DIx is low, control ROx to open 149 149 ))) 150 -|(% style="width:102px" %)2|(% style="width:331px" %)If DIx is high, control DOx to output high level, If DIx is low, control DOx to output low level|(% style="width:268px" %)((( 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 +((( 151 151 If DIx is high, control ROx to open, 331 +))) 152 152 333 +((( 153 153 if DIx is low, control ROx to close 154 154 ))) 155 -|(% style="width:102px" %)3|(% style="width:331px" %)DOx state flip|(% style="width:268px" %)ROx state flip 336 +))) 337 +|(% style="width:102px" %)((( 338 +3 339 +)))|(% style="width:331px" %)((( 340 +DOx state flip 341 +)))|(% style="width:268px" %)((( 342 +ROx state flip 343 +))) 156 156 157 -(% style="color:#4f81bd" %)**Example 4: ** 345 +((( 346 +(% style="color:blue" %)**Example 4: ** 347 +))) 158 158 349 +((( 159 159 **AT+GROUPMOD=0** Set to point to point mode 351 +))) 160 160 353 +((( 161 161 **AT+GROUPMOD=0,aa** Set the TX group that controls the number of aa (The maximum value of aa is 8) 355 +))) 162 162 357 + 163 163 ((( 164 164 **AT+GROUPMOD=1,bb** Set to the RX group controlled by the TX group, numbered bb(The maximum value of aa is 8) 165 165 ))) 166 166 362 + 363 +((( 167 167 **AT+GROUPMOD=0,2** Set to control the TX group of the two RX groups 365 +))) 168 168 367 +((( 169 169 **AT+GROUPMOD=1,1** Set the RX group numbered 1 369 +))) 170 170 371 +((( 171 171 **AT+GROUPMOD=1,2** Set the RX group numbered 2 373 +))) 172 172 173 173 376 +=== 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 + 174 174 == **2.4 Data Format** == 175 175 487 + 488 +((( 176 176 8 bytes of GROUPID + 9 bytes of payload + 4 bytes of checksum 490 +))) 177 177 492 +((( 493 + 494 +))) 178 178 179 -(% style="color:#4f81bd" %)**Payload:** 496 +((( 497 +(% style="color:blue" %)**Payload:** 498 +))) 180 180 181 181 (% border="1" style="background-color:#f7faff; color:black; width:938px" %) 182 -|=(% style="width: 123px;" %)**Size (bytes)**|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1|=(% style="width: 107px;" %)1 183 -|(% style="width:123px" %)**Value**|(% style="width:38px" %)address|(% style="width:70px" %)request|(% style="width:52px" %)ACK|(% style="width:127px" %)((( 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 +((( 184 184 DI1& 533 +))) 185 185 535 +((( 186 186 DI1 level 187 -)))|(% style="width:101px" %)DI1TODO1|(% style="width:91px" %)DI1TORO1|(% style="width:111px" %)((( 537 +))) 538 +)))|(% style="width:101px" %)((( 539 +DI1TODO1 540 +)))|(% style="width:91px" %)((( 541 +DI1TORO1 542 +)))|(% style="width:111px" %)((( 543 +((( 188 188 DI2& 545 +))) 189 189 547 +((( 190 190 DI2 level 191 -)))|(% style="width:105px" %)DI2TODO2|(% style="width:106px" %)DI2TORO2 549 +))) 550 +)))|(% style="width:105px" %)((( 551 +DI2TODO2 552 +)))|(% style="width:106px" %)((( 553 +DI2TORO2 554 +))) 192 192 556 +((( 193 193 (% style="color:#037691" %)**The first byte**(%%)**:** 00 is the broadcast address, 01-08 is the RX group number. 558 +))) 194 194 560 +((( 195 195 (% style="color:#037691" %)**The second byte**(%%)**:** send mapping request when not 0, not request when it is 0. 562 +))) 196 196 564 +((( 197 197 (% style="color:#037691" %)**The third byte**(%%)**:** ACK returned to the sender after the mapping is completed. 566 +))) 198 198 199 199 ((( 569 +((( 200 200 (% 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. 201 201 ))) 572 +))) 202 202 574 +((( 203 203 (% style="color:#037691" %)**The Fifth byte**(%%)**: **DI1TODO1 when the interrupt is triggered, 0 when the interrupt is not triggered. 576 +))) 204 204 578 +((( 205 205 (% style="color:#037691" %)**The Sixth byte**(%%)**:** 0 does not trigger interrupt when DI1TORO1 interrupt is triggered. 580 +))) 206 206 207 207 ((( 583 +((( 208 208 (% 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. 209 209 ))) 586 +))) 210 210 588 +((( 211 211 (% style="color:#037691" %)**The 8th byte**(%%)**: **DI2TODO2 when the interrupt is triggered, 0 when the interrupt is not triggered. 590 +))) 212 212 592 +((( 213 213 (% style="color:#037691" %)**The 9th byte**(%%)**:** DI2TORO2 when an interrupt is triggered, 0 when an interrupt is not triggered. 594 +))) 214 214 596 +((( 215 215 598 + 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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