Last modified by Xiaoling on 2025/04/14 16:33
<
From version < 51.23 >
edited by Xiaoling
on 2022/09/30 14:57
To version < 51.31 >
edited by Xiaoling
on 2022/09/30 16:44
>
Change comment: There is no comment for this version

Summary

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Content
... ... @@ -109,7 +109,7 @@
109 109  * LoRaWAN 1.0.3 Class A
110 110  * ESP32 PICO D4
111 111  * SX1276/78 Wireless Chip
112 -** Arduino IDE Compatible
112 +* Arduino IDE Compatible
113 113  * Open source hardware / software
114 114  * Regular/ Real-time GPS,BLE,WIFI tracking
115 115  * Built-in3 axis accelerometer (LIS3DH)
... ... @@ -216,41 +216,43 @@
216 216  The default uplink payload includes totally 11 bytes. (User can use AT+MOD=0 to enable the Temperature and humidity sensor to hum/tem info from accelerometer. When accelerometer info is enable, total payload will be 15 bytes, please note 15 bytes won't work on DR0 on US915/AU915 frequency band. )
217 217  
218 218  
219 -(% border="1.2" cellspacing="3" style="background-color:#ffffcc; color:green; width:500px" %)
219 +(% border="1.2" cellspacing="3" style="background-color:#ffffcc; color:green; width:480px" %)
220 220  |=(% scope="row" style="width: 50px;" %)(((
221 221  **Size(bytes)**
222 -)))|(% style="width:60px" %)4|(% style="width:70px" %)4|(% style="width:80px" %)2|(% style="width:50px" %)1|(% style="width:80px" %)(((
223 -2(optional )
224 -)))|(% style="width:80px" %)(((
222 +)))|(% style="width:60px" %)4|(% style="width:70px" %)4|(% style="width:80px" %)2|(% style="width:50px" %)1|(% style="width:88px" %)(((
225 225  2(optional)
224 +)))|(% style="width:87px" %)(((
225 +2(optional)
226 226  )))
227 227  |=(% style="width: 69px;" %)**Value**|(% style="width:76px" %)[[Latitude>>||anchor="HLocationinfo:"]]|(% style="width:87px" %)[[Longitude>>||anchor="HLocationinfo:"]]|(% style="width:76px" %)(((
228 228  [[Alarm & BAT>>||anchor="HAlarm26BAT:"]]
229 -)))|(% style="width:52px" %)[[FLAG>>||anchor="HFLAG:"]]|(% style="width:88px" %)[[Hum>>||anchor="HHum:"]]|(% style="width:83px" %)[[Tem>>||anchor="HTem:"]]
229 +)))|(% style="width:52px" %)[[FLAG>>||anchor="HFLAG:"]]|(% style="width:88px" %)[[Hum>>||anchor="HHum:"]]|(% style="width:87px" %)[[Tem>>||anchor="HTem:"]]
230 230  
231 231  [[image:1664501958445-288.png]]
232 232  
233 233  
234 -==== (% style="color:blue" %)Alarm & BAT:(%%) ====
234 +==== (% style="color:blue" %)**Alarm & BAT:**(%%) ====
235 235  
236 -(% border="1.2" cellspacing="3" style="background-color:#ffffcc; color:green; width:280px" %)
237 -|=(% scope="row" style="width: 50px;" %)**Size(bit)**|(% style="width:50px" %)1 bit|(% style="width:80px" %)1bit|(% style="width:50px" %)14 bits
236 +(% border="1.2" cellspacing="3" style="background-color:#ffffcc; color:green; width:250px" %)
237 +|=(% scope="row" style="width: 50px;" %)**Size(bit)**|(% style="width:50px" %)1 bit|(% style="width:80px" %)1bit|(% style="width:50px" %)14bits
238 238  |=(% style="width: 72px;" %)**Value**|(% style="width:67px" %)reserve|(% style="width:118px" %)Alarm Indicate|(% style="width:63px" %)[[BAT>>||anchor="HBAT:"]] 
239 239  
240 -==== (% style="color:blue" %)FLAG:(%%) ====
241 241  
242 -(% border="1.2" cellspacing="3" style="background-color:#ffffcc; color:green; width:280px" %)
243 -|=(% scope="row" style="width: 50px;" %)**Size(bit)**|(% style="width:50px" %)2 bits|(% style="width:50px" %)1bit|(% style="width:100px" %)5 bits
244 -|=(% style="width: 79px;" %)**Value**|(% style="width:55px" %)[[MOD>>||anchor="H2.3.4BLEpositioningPayload28Fport229"]]|(% style="width:47px" %)[[LON>>||anchor="HLON:"]]|(% style="width:140px" %)Firmware version 
241 +==== (% style="color:blue" %)**FLAG:**(%%) ====
245 245  
243 +(% border="1.2" cellspacing="3" style="background-color:#ffffcc; color:green; width:250px" %)
244 +|=(% scope="row" style="width: 50px;" %)**Size(bit)**|(% style="width:50px" %)2bits|(% style="width:50px" %)1bit|(% style="width:100px" %)5 bits
245 +|=(% style="width: 79px;" %)**Value**|(% style="width:55px" %)[[MOD>>||anchor="H3.2.7SetPositioningMode"]]|(% style="width:47px" %)[[LON>>||anchor="HLON:"]]|(% style="width:140px" %)Firmware version 
246 +
246 246  **Example:** Payload: 0x02863D68 FAC29BAF 4B45 60 0202 011A 
247 247  
248 248  
249 -==== (% style="color:blue" %)Location info:(%%) ====
250 +==== (% style="color:blue" %)**Location info:**(%%) ====
250 250  
251 251  * Latitude: 02863D68  ⇒  //if (0x//02863D68//& 0x80000000 = 0 )~://  //value = 02863D68 /1000000 = 42.351976//
252 252  * Longitude: FAC29BAF  ⇒ //if (0x//FAC29BAF// & 0x80000000 = 1 )~://  //value = (0x//FAC29BAF// – 0x 100000000)/1000000 =//-87.9094//57//
253 253  
255 +
254 254  (% style="color:red" %)**Important note:**
255 255  
256 256  1.  When power is low (<2.84v), GPS won't be able to get location info and GPS feature will be disabled and the location field will be filled with 0x0FFFFFFF, 0x0FFFFFFF.
... ... @@ -270,20 +270,19 @@
270 270  
271 271  
272 272  
273 -==== (% style="color:blue" %)Alarm:(%%) ====
275 +==== (% style="color:blue" %)**Alarm:**(%%) ====
274 274  
275 -
276 276  Example:  0x4B & 0x40 >> 6 = 0x01
277 277  
278 278  
279 -==== (% style="color:blue" %)BAT:(%%) ====
280 +==== (% style="color:blue" %)**BAT:**(%%) ====
280 280  
281 -
282 282  Example:  0x0CDD & 0x3FFF ⇒ 3293 (mV).
283 283  
284 +(((
284 284  The battery info shows the current voltage, for (% style="color:blue" %)**TrackerD**(%%) version which powered by li-on battery. User can use below mapping to indicate the battery in percentage: \
286 +)))
285 285  
286 -
287 287  * > 4.0v :  80% ~~ 100%
288 288  * 3.85v ~~3.99v:  60% ~~ 80%
289 289  * 3.70v ~~ 3.84v:  40% ~~ 60%
... ... @@ -290,28 +290,33 @@
290 290  * 3.40v ~~ 3.69v:  20% ~~ 40%
291 291  * < 3.39v:  0~~20%
292 292  
293 -==== (% style="color:blue" %)LON:(%%) ====
294 294  
295 -
295 +
296 +==== (% style="color:blue" %)**LON:**(%%) ====
297 +
298 +
296 296  Enable/Disable LED activity for uplink
297 297  
301 +(((
298 298  0x00:  Disable LED indicator.
303 +)))
299 299  
305 +(((
300 300  0x01:  Enable LED indicator (Default Value)
307 +)))
301 301  
302 302  
303 -==== (% style="color:blue" %)Hum:(%%) ====
310 +==== (% style="color:blue" %)**Hum:**(%%) ====
304 304  
305 305  0202 = //if (0x0202 & 0x8000 = 0 ):  value =// 0x0202 / 100 = +514 ⇒ 51.4 degree
306 306  
307 307  
308 -==== (% style="color:blue" %)Tem:(%%) ====
315 +==== (% style="color:blue" %)**Tem:**(%%) ====
309 309  
310 310  011A =if (0x011A & 0x8000 = 1 ):  value =( 0x011A - 0x10000)/10(dec) ⇒ -//28.2 degree//
311 311  
312 312  
313 313  
314 -
315 315  === 2.3.3 Uplink FPORT~= , History GNSS Positioning ===
316 316  
317 317  
... ... @@ -319,17 +319,13 @@
319 319  === 2.3.4 BLE positioning Payload(Fport2) ===
320 320  
321 321  
322 -Different MODE has different payload:
328 +Different MODE has different payload:  (% style="color:blue" %)**MODE=2**
323 323  
324 -**MODE=2**
325 -
326 -(% border="2" style="background-color:#ffffcc; color:green; width:491px" %)
327 -|(% style="width:70px" %)(((
328 -**Size**
329 -
330 -**(bytes)**
331 -)))|(% style="width:44px" %)16|(% style="width:61px" %)4|(% style="width:63px" %)4|(% style="width:71px" %)2|(% style="width:50px" %)4|(% style="width:47px" %)2|(% style="width:15px" %)1
332 -|(% style="width:70px" %)**Value**|(% style="width:44px" %)[[UUID>>||anchor="HLocationinfo:"]]|(% style="width:61px" %)(((
330 +(% border="1.5" cellspacing="3" style="background-color:#ffffcc; color:green; width:450px" %)
331 +|=(% scope="row" style="width: 60px;" %)(((
332 +**Size(bytes)**
333 +)))|(% style="width:30px" %)16|(% style="width:50px" %)4|(% style="width:50px" %)4|(% style="width:120px" %)2|(% style="width:50px" %)4|(% style="width:50px" %)2|(% style="width:30px" %)1
334 +|=(% style="width: 50px;" %)**Value**|(% style="width:44px" %)[[UUID>>||anchor="HLocationinfo:"]]|(% style="width:61px" %)(((
333 333  iBeacon MAJOR
334 334  )))|(% style="width:63px" %)(((
335 335  iBeacon MINOR
... ... @@ -352,6 +352,8 @@
352 352  * (% style="color:#037691" %)**Measured Power: ** (%%) The Measured Power from the strongest iBeacon.
353 353  * (% style="color:#037691" %)**RSSI:  ** (%%) The RSSI from the strongest iBeacon.
354 354  
357 +
358 +
355 355  === 2.3.5 Add Payload format in TTN V3 ===
356 356  
357 357  
... ... @@ -375,9 +375,13 @@
375 375  == 2.4 Integrate with Datacake ==
376 376  
377 377  
382 +(((
378 378  After TrackerD sends data to LoRaWAN server such as TTN, use can pass the data to Datacake and plot out, currently only support GPS plot.
384 +)))
379 379  
386 +(((
380 380  Instruction is here:  [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Notes%20for%20Data%20Cake/#H7.Example~~-~~-AddTrackerDGPSTrackingInDataCake>>url:http://wiki.dragino.com/xwiki/bin/view/Main/Notes%20for%20Data%20Cake/#H7.Example--AddTrackerDGPSTrackingInDataCake]]
388 +)))
381 381  
382 382  
383 383  [[image:1664502695771-538.png]]
... ... @@ -387,9 +387,13 @@
387 387  == 2.5 Integrate with Tago ==
388 388  
389 389  
398 +(((
390 390  After TrackerD sends data to LoRaWAN server such as TTN, use can pass the data to Datacake and plot out, currently only support GPS plot.
400 +)))
391 391  
402 +(((
392 392  Instruction is here: [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/Tago.IO/#H3.A0Example-CreateTrackerD2FLGT92positioningwidget>>url:http://wiki.dragino.com/xwiki/bin/view/Main/Tago.IO/#H3.A0Example-CreateTrackerD2FLGT92positioningwidget]]
404 +)))
393 393  
394 394  
395 395  [[image:1664502715371-321.png]]
... ... @@ -399,22 +399,30 @@
399 399  == 2.6 Alarm Mode ==
400 400  
401 401  
414 +(((
402 402  User can push the (% style="color:red" %)**RED button**(%%) by more than 5 seconds to enter Alarm Mode.
416 +)))
403 403  
404 404  
419 +(((
405 405  Once enter Alarm mode, the (% style="color:green" %)**GREEN LED**(%%) will flash 3 times, the buzzer will alarm for 5 seconds, then TrackerD will immediately send a packet without location info and then send a data packet with GPS positioning information. After that, the device will send 60 packets at 1-minute intervals. The Alarm flag in the payload will be set for the next 60 packets unless exit alert mode.
421 +)))
406 406  
407 407  
424 +(((
408 408  Two ways to exit alarm mode:
426 +)))
409 409  
410 410  * Server send a downlink command to exit.
411 411  * User fast press the RED button 10 times.
412 412  
431 +(((
413 413  When exit alarm mode, (% style="color:red" %)**RED LED**(%%) will light up for 5 seconds, indicating that the alarm mode is exited. And the alert flag will be set to false.
433 +)))
414 414  
415 415  
416 416  
417 -== 2.7 Sports Mode ~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-- ==
437 +== 2.7 Sports Mode ==
418 418  
419 419  
420 420  
... ... @@ -421,8 +421,8 @@
421 421  == 2.8 LED Status ==
422 422  
423 423  
424 -(% border="2" style="background-color:#ffffcc; color:green; width:636px" %)
425 -|(% style="width:157px" %)**Event**|(% style="width:271px" %)**Action**|(% style="width:202px" %)**AT+LON to control on/off**
444 +(% border="1.5" style="background-color:#ffffcc; color:green; width:500px" %)
445 +|=(% style="width: 150px;" %)**Event**|=(% style="width: 200px;" %)**Action**|=(% style="width: 150px;" %)**AT+LON to control on/off**
426 426  |(% style="width:157px" %)**Power On**|(% style="width:271px" %)(% style="color:blue" %)**BLUE, **(% style="color:red" %)**RED , **(% style="color:green" %)**Green** flash once|(% style="width:202px" %)N/A
427 427  |(% style="width:157px" %)**Join request**|(% style="width:271px" %)(% style="color:green" %)**Green** (%%)led fast blink once (200ms)|(% style="width:202px" %)Yes
428 428  |(% style="width:157px" %)**Join Success**|(% style="width:271px" %)(% style="color:green" %)**Green**(%%) led on 5 second|(% style="width:202px" %)N/A
... ... @@ -435,10 +435,11 @@
435 435  |(% style="width:157px" %)**Get Downlink**|(% style="width:271px" %)(% style="color:green" %)**GREEN**(%%) led on 1 second|(% style="width:202px" %)Yes
436 436  |(% style="width:157px" %)**Movement Detect**|(% style="width:271px" %)(% style="color:red" %)**RED **(%%)led on 500ms|(% style="width:202px" %)N/A
437 437  
458 +
438 438  == 2.9 Button Function ==
439 439  
440 440  
441 -(% style="color:green" %)**RESET button:**
462 +(% style="color:blue" %)**RESET button:**
442 442  
443 443  [[image:1664502835802-546.png]]
444 444  
... ... @@ -450,8 +450,8 @@
450 450  [[image:1664502854406-763.png]]
451 451  
452 452  
453 -(% border="2" style="background-color:#ffffcc; color:green; width:627px" %)
454 -|(% style="width:135px" %)**Function**|(% style="width:220px" %)**Action**|(% style="width:265px" %)**Description**
474 +(% border="1.5" style="background-color:#ffffcc; color:green; width:520px" %)
475 +|=(% style="width: 100px;" %)**Function**|=(% style="width: 210px;" %)**Action**|=(% style="width: 210px;" %)**Description**
455 455  |(% style="width:135px" %)Send Alarm|(% style="width:220px" %)Keep Pressing (% style="color:red" %)**RED**(%%) button for more than 5 seconds|(% style="width:265px" %)Enter Alarm Mode.  See [[Alarm Mode>>||anchor="H2.6AlarmMode"]]
456 456  |(% style="width:135px" %)Exit Alarm Mode|(% style="width:220px" %)Fast press the (% style="color:red" %)**RED** (%%)button 10 times|(% style="width:265px" %)Exit Alarm Mode
457 457  |(% style="width:135px" %)Enter Deep Sleep Mode|(% style="width:220px" %)Press and hold the button for 10 seconds, then quickly press the device 3 times to enter deep sleep|(% style="width:265px" %)This is the mode ship out from factory. CPU will be complete in sleep mode and no LoRa activity, only use before deploy.
... ... @@ -468,6 +468,7 @@
468 468  * [[Upgrade Firmware>>||anchor="H5.UploadFirmware"]]
469 469  
470 470  
492 +
471 471  = 3. Configure TrackerD via AT command or LoRaWAN downlink =
472 472  
473 473  
... ... @@ -549,7 +549,7 @@
549 549  
550 550  (% style="color:#037691" %)**AT+MTDC=xx. **
551 551  
552 - Example:  AT+MTDC=300000  **~-~->    ** Set Sports Mode Packet Interval to 300 seconds. TrackerD will send every 300 seconds in Sports mode, Default Value: 300000
574 +Example:  AT+MTDC=300000  **~-~->    ** Set Sports Mode Packet Interval to 300 seconds. TrackerD will send every 300 seconds in Sports mode, Default Value: 300000
553 553  
554 554  
555 555  * (% style="color:blue" %)**Downlink Payload (prefix 0x03):**
... ... @@ -580,7 +580,7 @@
580 580  
581 581  (% style="color:#037691" %)**AT+LON=xx.  (Disable (0), Enable (1), default:1)**
582 582  
583 - Example: AT+LON=0  **~-~-> ** Disable LED for position, downlink and uplink.
605 +Example: AT+LON=0  **~-~-> ** Disable LED for position, downlink and uplink.
584 584  
585 585  
586 586  * (% style="color:blue" %)**Downlink Payload (prefix 0xAE):**
... ... @@ -598,7 +598,7 @@
598 598  
599 599  (% style="color:#037691" %)**AT+INTWK=xx.  (Disable (0), Enable (1), default:0)**
600 600  
601 - Example:  AT+ INTWK =1  **~-~->   ** Enable detect movement.
623 +Example:  AT+ INTWK =1  **~-~->   ** Enable detect movement.
602 602  
603 603  
604 604  * (% style="color:blue" %)**Downlink Payload (prefix 0xAF):**
... ... @@ -736,7 +736,7 @@
736 736  After installation of the driver and plug in TrackerD, user should be able to see com port in PC's device manager.
737 737  
738 738  
739 -(% style="color:blue" %)**Step3：**(%%) Download and Install Flash Tool:  [[https:~~/~~/www.espressif.com.cn/en/support/download/other-tools?keys=Flash%2BDownload%2BTools>>url:https://www.espressif.com.cn/en/support/download/other-tools?keys=Flash%2BDownload%2BTools]]
761 +(% style="color:blue" %)**Step3:  **(%%)Download and Install Flash Tool:  [[https:~~/~~/www.espressif.com.cn/en/support/download/other-tools?keys=Flash%2BDownload%2BTools>>url:https://www.espressif.com.cn/en/support/download/other-tools?keys=Flash%2BDownload%2BTools]]
740 740  
741 741  
742 742  (% style="color:blue" %)**Step4:** (%%) Run Flash Download Tool and configure chip type to ESP32
... ... @@ -779,7 +779,7 @@
779 779  === 6.1.1 Set up ARDUINO compile environment ===
780 780  
781 781  
782 -* Download the latest Arduino software (IDE) from the Arduino official website:  [[https:~~/~~/www.arduino.cc/en/Main/Software>>url:https://www.arduino.cc/en/Main/Software]]
804 +* **Download the latest Arduino software (IDE) from the Arduino official website:  [[https:~~/~~/www.arduino.cc/en/Main/Software>>url:https://www.arduino.cc/en/Main/Software]]**
783 783  
784 784  Install IDE on PC, open and click (% style="color:#037691" %)**File ~-~-> Preference**,(%%) add the following URL:  [[https:~~/~~/dl.espressif.com/dl/package_esp32_index.json>>url:https://links.jianshu.com/go?to=https%3A%2F%2Fdl.espressif.com%2Fdl%2Fpackage_esp32_index.json]]
785 785  
... ... @@ -787,13 +787,13 @@
787 787  [[image:1664503635019-941.png]]
788 788  
789 789  
790 -* (% style="color:#037691" %)**Go to tools ~-~-> Boards ~-~-> Boards Manager**,(%%) find the esp32 information and install it.
812 +* (% style="color:#037691" %)**Go to tools ~-~-> Boards ~-~-> Boards Manager**,(%%) **find the esp32 information and install it.**
791 791  
792 792  [[image:1664503715811-892.png]]
793 793  
794 794  
795 795  
796 -* Download the latest TrackerD from the dragino github: [[https:~~/~~/github.com/dragino/TrackerD>>url:https://github.com/dragino/TrackerD]]
818 +* **Download the latest TrackerD from the dragino github: [[https:~~/~~/github.com/dragino/TrackerD>>url:https://github.com/dragino/TrackerD]]**
797 797  
798 798  Put the Library in the TrackerD directory into the libraries file in the Arduino directory:
799 799  
... ... @@ -840,8 +840,8 @@
840 840  
841 841  
842 842  
843 -(% border="2" style="background-color:#ffffcc; color:green; width:314px" %)
844 -|(% style="width:118px" %)**Pin**|(% style="width:67px" %)**Color**|(% style="width:123px" %)**USB Pin**
865 +(% border="1.5" cellspacing="3" style="background-color:#ffffcc; color:green; width:314px" %)
866 +|=(% style="width: 118px;" %)**Pin**|=(% style="width: 67px;" %)**Color**|=(% style="width: 123px;" %)**USB Pin**
845 845  |(% style="width:118px" %)A4,B4,A9,B9|(% style="width:67px" %)Red|(% style="width:123px" %)VCC
846 846  |(% style="width:118px" %)A7,B7|(% style="width:67px" %)White|(% style="width:123px" %)D- (N/A)
847 847  |(% style="width:118px" %)A6,B6|(% style="width:67px" %)Green|(% style="width:123px" %)D+(N/A)
... ... @@ -851,6 +851,7 @@
851 851  |(% style="width:118px" %)A8|(% style="width:67px" %)Yellow|(% style="width:123px" %)MTMS/GPIO14
852 852  |(% style="width:118px" %)B8|(% style="width:67px" %)Grey|(% style="width:123px" %)MTDO/GPIO15
853 853  
876 +
854 854  = 8.  Order Info =
855 855  
856 856  
... ... @@ -866,25 +866,31 @@
866 866  * (% style="color:red" %)**AU915**(%%): Default frequency band AU915
867 867  * (% style="color:red" %)**US915**(%%): Default frequency band US915
868 868  
892 +
893 +
869 869  = 9.  Packing Info =
870 870  
871 871  
872 -**Package Includes**:
897 +(% style="color:#037691" %)**Package Includes**:
873 873  
874 874  * TrackerD LoRaWAN GPS/BLE Tracker x 1
875 875  * USB recharge & program cable x 1
876 876  
877 -**Dimensions and Weight**:
902 +(% style="color:#037691" %)**Dimensions and Weight**:
878 878  
879 879  * Device Size: 85 x 48 x 15 cm
880 880  * Weight: 50g
881 881  
907 +
908 +
882 882  = 10. Support =
883 883  
884 884  
885 885  * Support is provided Monday to Friday, from 09:00 to 18:00 GMT+8. Due to different timezones we cannot offer live support. However, your questions will be answered as soon as possible in the before-mentioned schedule.
886 -* Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]]
913 +* Provide as much information as possible regarding your enquiry (product models, accurately describe your problem and steps to replicate it etc) and send a mail to [[support@dragino.com>>url:file:///D:/市场资料/说明书/LoRa/LT系列/support@dragino.com]].
887 887  
915 +
916 +
888 888  = 11.  Reference =
889 889  
890 890  
... ... @@ -891,3 +891,5 @@
891 891  * [[**Firmware in Bin format**>>https://www.dropbox.com/sh/733s8xlwahhqg1d/AABxDz80lBVX_to8zNuUQWFja?dl=0]]
892 892  * **[[Source Code>>https://github.com/dragino/TrackerD]] **
893 893  * [[**Hardware Source**>>https://www.dropbox.com/sh/orwoy6cecb89m4e/AAD37sRuUrvKsHgAJxuVTkB5a?dl=0]]
923 +
924 +

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