Changes for page DS20L -- LoRaWAN Smart Distance Detector User Manual 01
Last modified by Mengting Qiu on 2023/12/14 11:15
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... ... @@ -54,8 +54,6 @@ 54 54 * Downlink to change configure 55 55 * 8500mAh Battery for long term use 56 56 57 - 58 - 59 59 == 1.3 Specification == 60 60 61 61 ... ... @@ -102,7 +102,6 @@ 102 102 * LoRa Transmit Mode: 125mA @ 20dBm, 82mA @ 14dBm 103 103 104 104 105 - 106 106 == 1.4 Applications == 107 107 108 108 ... ... @@ -115,7 +115,6 @@ 115 115 * Sewer 116 116 117 117 118 - 119 119 (% style="display:none" %) 120 120 121 121 == 1.5 Sleep mode and working mode == ... ... @@ -145,8 +145,6 @@ 145 145 ))) 146 146 |(% style="width:167px" %)Fast press ACT 5 times.|(% style="width:117px" %)Deactivate Device|(% style="width:225px" %)(% style="color:red" %)**Red led**(%%) will solid on for 5 seconds. Means device is in Deep Sleep Mode. 147 147 148 - 149 - 150 150 == 1.7 BLE connection == 151 151 152 152 ... ... @@ -166,6 +166,7 @@ 166 166 [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/WL03A-LB_LoRaWAN_None-Position_Rope_Type_Water_Leak_Controller_User_Manual/WebHome/image-20230613144156-1.png?rev=1.1||alt="image-20230613144156-1.png"]] 167 167 168 168 163 + 169 169 == 1.9 Mechanical == 170 170 171 171 ... ... @@ -181,6 +181,7 @@ 181 181 (% style="color:blue" %)**Probe Mechanical:** 182 182 183 183 179 + 184 184 [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLDS12-LoRaWAN%20LiDAR%20ToF%20Distance%20Sensor%20User%20Manual/WebHome/1654827224480-952.png?rev=1.1||alt="1654827224480-952.png"]] 185 185 186 186 ... ... @@ -244,7 +244,7 @@ 244 244 After join success, it will start to upload messages to TTN and you can see the messages in the panel. 245 245 246 246 247 -== 2.3 Uplink Payload == 243 +== 2.3 Uplink Payload == 248 248 249 249 250 250 ((( ... ... @@ -255,22 +255,23 @@ 255 255 Uplink payload includes in total 11 bytes. 256 256 ))) 257 257 254 + 258 258 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %) 259 259 |=(% style="width: 62.5px;background-color:#4F81BD;color:white" %)((( 260 260 **Size(bytes)** 261 261 )))|=(% style="width: 62.5px;background-color:#4F81BD;color:white" %)**2**|=(% style="width: 62.5px;background-color:#4F81BD;color:white" %)**2**|=(% style="background-color:#4F81BD;color:white" %)**2**|=(% style="background-color:#4F81BD;color:white" %)**2**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1** 262 -|(% style="width:62.5px" %)Value|(% style="width:62.5px" %)[[BAT>>||anchor="H2.3.1BatteryInfo"]]|(% style="width:62.5px" %)((( 263 -[[Temperature DS18B20>>||anchor="H2.3.2DS18B20Temperaturesensor"]] 264 -)))|[[Distance>>||anchor="H2.3.3Distance"]]|[[Distance signal strength>>||anchor="H2.3.4Distancesignalstrength"]]|((( 265 -[[Interrupt flag>>||anchor="H2.3.5InterruptPin"]] 266 -)))|[[LiDAR temp>>||anchor="H2.3.6LiDARtemp"]]|((( 267 -[[Message Type>>||anchor="H2.3.7MessageType"]] 259 +|(% style="width:62.5px" %)**Value**|(% style="width:62.5px" %)[[BAT>>||anchor="H2.3.1A0BatteryInfo"]]|(% style="width:62.5px" %)((( 260 +[[Temperature DS18B20>>||anchor="H2.3.2A0DS18B20Temperaturesensor"]] 261 +)))|[[Distance>>||anchor="H2.3.3A0Distance"]]|[[Distance signal strength>>||anchor="H2.3.4A0Distancesignalstrength"]]|((( 262 +[[Interrupt flag>>||anchor="H2.3.5A0InterruptPin"]] 263 +)))|[[LiDAR temp>>||anchor="H2.3.6A0LiDARtemp"]]|((( 264 +[[Message Type>>||anchor="H2.3.7A0MessageType"]] 268 268 ))) 269 269 270 270 [[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLDS12-LoRaWAN%20LiDAR%20ToF%20Distance%20Sensor%20User%20Manual/WebHome/1654833689380-972.png?rev=1.1||alt="1654833689380-972.png"]] 271 271 272 272 273 -=== 2.3.1 Battery Info === 270 +=== 2.3.1 Battery Info === 274 274 275 275 276 276 Check the battery voltage for LDS12-LB. ... ... @@ -280,7 +280,7 @@ 280 280 Ex2: 0x0B49 = 2889mV 281 281 282 282 283 -=== 2.3.2 DS18B20 Temperature sensor === 280 +=== 2.3.2 DS18B20 Temperature sensor === 284 284 285 285 286 286 This is optional, user can connect external DS18B20 sensor to the +3.3v, 1-wire and GND pin . and this field will report temperature. ... ... @@ -293,7 +293,7 @@ 293 293 If payload is: FF3FH : (FF3F & FC00 == 1) , temp = (FF3FH - 65536)/10 = -19.3 degrees. 294 294 295 295 296 -=== 2.3.3 Distance === 293 +=== 2.3.3 Distance === 297 297 298 298 299 299 Represents the distance value of the measurement output, the default unit is cm, and the value range parsed as a decimal number is 0-1200. In actual use, when the signal strength value Strength. ... ... @@ -304,7 +304,7 @@ 304 304 If the data you get from the register is 0x0B 0xEA, the distance between the sensor and the measured object is 0BEA(H) = 3050 (D)/10 = 305cm. 305 305 306 306 307 -=== 2.3.4 Distance signal strength === 304 +=== 2.3.4 Distance signal strength === 308 308 309 309 310 310 Refers to the signal strength, the default output value will be between 0-65535. When the distance measurement gear is fixed, the farther the distance measurement is, the lower the signal strength; the lower the target reflectivity, the lower the signal strength. When Strength is greater than 100 and not equal to 65535, the measured value of Dist is considered credible. ... ... @@ -317,12 +317,12 @@ 317 317 Customers can judge whether they need to adjust the environment based on the signal strength. 318 318 319 319 320 -=== 2.3.5 Interrupt Pin === 317 +=== 2.3.5 Interrupt Pin === 321 321 322 322 323 -This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H 3.3.2SetInterruptMode"]] for the hardware and software set up.320 +This data field shows if this packet is generated by interrupt or not. [[Click here>>||anchor="H4.2A0SetInterruptMode"]] for the hardware and software set up. 324 324 325 -Note: The Internet Pin is a separate pin in the screw terminal. See [[pin mapping>>||anchor="H1. 8PinDefinitions"]].322 +Note: The Internet Pin is a separate pin in the screw terminal. See [[pin mapping>>||anchor="H1.6A0Pinmappingandpoweron"]]. 326 326 327 327 **Example:** 328 328 ... ... @@ -331,7 +331,7 @@ 331 331 0x01: Interrupt Uplink Packet. 332 332 333 333 334 -=== 2.3.6 LiDAR temp === 331 +=== 2.3.6 LiDAR temp === 335 335 336 336 337 337 Characterize the internal temperature value of the sensor. ... ... @@ -341,7 +341,7 @@ 341 341 If payload is: F2(H) <<24>>24=-14(D),LiDAR temp=-14℃. 342 342 343 343 344 -=== 2.3.7 Message Type === 341 +=== 2.3.7 Message Type === 345 345 346 346 347 347 ((( ... ... @@ -353,20 +353,19 @@ 353 353 ))) 354 354 355 355 (% border="1" cellspacing="5" style="background-color:#f2f2f2; width:499px" %) 356 -|=(% style="width: 161px;background-color:# 4F81BD;color:white" %)**Message Type Code**|=(% style="width: 164px;background-color:#4F81BD;color:white" %)**Description**|=(% style="width: 174px;background-color:#4F81BD;color:white" %)**Payload**357 -|(% style="width:160px" %)0x01|(% style="width:163px" %)Normal Uplink|(% style="width:173px" %)[[Normal Uplink Payload>>||anchor="H2.3200BUplinkPayload"]] 358 -|(% style="width:160px" %)0x02|(% style="width:163px" %)Reply configures info|(% style="width:173px" %)[[Configure Info Payload>>||anchor="H 3.ConfigureLDS12-LB"]]353 +|=(% style="width: 161px;background-color:#D9E2F3;color:#0070C0" %)**Message Type Code**|=(% style="width: 164px;background-color:#D9E2F3;color:#0070C0" %)**Description**|=(% style="width: 174px;background-color:#D9E2F3;color:#0070C0" %)**Payload** 354 +|(% style="width:160px" %)0x01|(% style="width:163px" %)Normal Uplink|(% style="width:173px" %)[[Normal Uplink Payload>>||anchor="H2.3A0200BUplinkPayload"]] 355 +|(% style="width:160px" %)0x02|(% style="width:163px" %)Reply configures info|(% style="width:173px" %)[[Configure Info Payload>>||anchor="H4.3A0GetFirmwareVersionInfo"]] 359 359 357 +=== 2.3.8 Decode payload in The Things Network === 360 360 361 361 362 -=== 2.3.8 Decode payload in The Things Network === 363 - 364 - 365 365 While using TTN network, you can add the payload format to decode the payload. 366 366 367 -[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLDS12-LoRaWAN%20LiDAR%20ToF%20Distance%20Sensor%20User%20Manual/WebHome/1654592762713-715.png?rev=1.1||alt="1654592762713-715.png"]] 368 368 363 +[[image:1654592762713-715.png]] 369 369 365 + 370 370 ((( 371 371 The payload decoder function for TTN is here: 372 372 ))) ... ... @@ -376,13 +376,13 @@ 376 376 ))) 377 377 378 378 379 -== 2.4 Uplink Interval == 375 +== 2.4 Uplink Interval == 380 380 381 381 382 382 The LDS12-LB by default uplink the sensor data every 20 minutes. User can change this interval by AT Command or LoRaWAN Downlink Command. See this link: [[Change Uplink Interval>>||anchor="H3.3.1SetTransmitIntervalTime"]] 383 383 384 384 385 -== 2.5 Show Data in DataCake IoT Server == 381 +== 2.5 Show Data in DataCake IoT Server == 386 386 387 387 388 388 ((( ... ... @@ -509,15 +509,16 @@ 509 509 510 510 The LiDAR probe is based on TOF, namely, Time of Flight principle. To be specific, the product emits modulation wave of near infrared ray on a periodic basis, which will be reflected after contacting object. The product obtains the time of flight by measuring round-trip phase difference and then calculates relative range between the product and the detection object, as shown below. 511 511 512 -[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLDS12-LoRaWAN%20LiDAR%20ToF%20Distance%20Sensor%20User%20Manual/WebHome/1654831757579-263.png?rev=1.1||alt="1654831757579-263.png"]] 513 513 509 +[[image:1654831757579-263.png]] 514 514 511 + 515 515 === 2.8.2 Distance Measurement Characteristics === 516 516 517 517 518 518 With optimization of light path and algorithm, The LiDAR probe has minimized influence from external environment on distance measurement performance. Despite that, the range of distance measurement may still be affected by the environment illumination intensity and the reflectivity of detection object. As shown in below: 519 519 520 -[[image: http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLDS12-LoRaWAN%20LiDAR%20ToF%20Distance%20Sensor%20User%20Manual/WebHome/1654831774373-275.png?rev=1.1||alt="1654831774373-275.png"]]517 +[[image:1654831774373-275.png]] 521 521 522 522 523 523 ((( ... ... @@ -537,20 +537,23 @@ 537 537 Vertical Coordinates: Represents the radius of light spot for The LiDAR probe at different distances. The diameter of light spot depends on the FOV of The LiDAR probe (the term of FOV generally refers to the smaller value between the receiving angle and the transmitting angle), which is calculated as follows: 538 538 ))) 539 539 540 -[[image:http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLDS12-LoRaWAN%20LiDAR%20ToF%20Distance%20Sensor%20User%20Manual/WebHome/1654831797521-720.png?rev=1.1||alt="1654831797521-720.png"]] 541 541 538 +[[image:1654831797521-720.png]] 539 + 540 + 542 542 ((( 543 543 In the formula above, d is the diameter of light spot; D is detecting range; β is the value of the receiving angle of The LiDAR probe, 3.6°. Correspondence between the diameter of light spot and detecting range is given in Table below. 544 544 ))) 545 545 546 -[[image: http://wiki.dragino.com/xwiki/bin/download/Main/User%20Manual%20for%20LoRaWAN%20End%20Nodes/LLDS12-LoRaWAN%20LiDAR%20ToF%20Distance%20Sensor%20User%20Manual/WebHome/1654831810009-716.png?rev=1.1||alt="1654831810009-716.png"]]545 +[[image:1654831810009-716.png]] 547 547 547 + 548 548 ((( 549 549 If the light spot reaches two objects with different distances, as shown in Figure 3, the output distance value will be a value between the actual distance values of the two objects. For a high accuracy requirement in practice, the above situation should be noticed to avoid the measurement error. 550 550 ))) 551 551 552 552 553 -=== 2.8.3 Notice of usage === 553 +=== 2.8.3 Notice of usage: === 554 554 555 555 556 556 Possible invalid /wrong reading for LiDAR ToF tech: ... ... @@ -560,13 +560,11 @@ 560 560 * The LiDAR probe is cover by dirty things; the reading might be wrong. In this case, need to clean the probe. 561 561 * The sensor window is made by Acrylic. Don't touch it with alcohol material. This will destroy the sensor window. 562 562 563 - 564 - 565 565 === 2.8.4 Reflectivity of different objects === 566 566 567 567 568 568 (% border="1" cellspacing="5" style="background-color:#f2f2f2; width:379px" %) 569 -|=(% style="width: 54px;background-color:# 4F81BD;color:white" %)Item|=(% style="width: 231px;background-color:#4F81BD;color:white" %)Material|=(% style="width: 94px;background-color:#4F81BD;color:white" %)Relectivity567 +|=(% style="width: 54px;background-color:#D9E2F3;color:#0070C0" %)Item|=(% style="width: 231px;background-color:#D9E2F3;color:#0070C0" %)Material|=(% style="width: 94px;background-color:#D9E2F3;color:#0070C0" %)Relectivity 570 570 |(% style="width:53px" %)1|(% style="width:229px" %)Black foam rubber|(% style="width:93px" %)2.4% 571 571 |(% style="width:53px" %)2|(% style="width:229px" %)Black fabric|(% style="width:93px" %)3% 572 572 |(% style="width:53px" %)3|(% style="width:229px" %)Black rubber|(% style="width:93px" %)4% ... ... @@ -588,8 +588,6 @@ 588 588 |(% style="width:53px" %)17|(% style="width:229px" %)stainless steel|(% style="width:93px" %)200% 589 589 |(% style="width:53px" %)18|(% style="width:229px" %)Reflector plate, reflective tape|(% style="width:93px" %)>300% 590 590 591 - 592 - 593 593 = 3. Configure LDS12-LB = 594 594 595 595 == 3.1 Configure Methods == ... ... @@ -603,8 +603,6 @@ 603 603 604 604 * LoRaWAN Downlink. Instruction for different platforms: See [[IoT LoRaWAN Server>>http://wiki.dragino.com/xwiki/bin/view/Main/]] section. 605 605 606 - 607 - 608 608 == 3.2 General Commands == 609 609 610 610 ... ... @@ -637,7 +637,7 @@ 637 637 ))) 638 638 639 639 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %) 640 -|=(% style="width: 156px;background-color:# 4F81BD;color:white" %)**Command Example**|=(% style="width: 137px;background-color:#4F81BD;color:white" %)**Function**|=(% style="background-color:#4F81BD;color:white" %)**Response**634 +|=(% style="width: 156px;background-color:#D9E2F3; color:#0070c0" %)**Command Example**|=(% style="width: 137px;background-color:#D9E2F3; color:#0070c0" %)**Function**|=(% style="background-color:#D9E2F3; color:#0070c0" %)**Response** 641 641 |(% style="width:156px" %)AT+TDC=?|(% style="width:137px" %)Show current transmit Interval|((( 642 642 30000 643 643 OK ... ... @@ -665,9 +665,6 @@ 665 665 ))) 666 666 * ((( 667 667 Example 2: Downlink Payload: 0100003C ~/~/ Set Transmit Interval (TDC) = 60 seconds 668 - 669 - 670 - 671 671 ))) 672 672 673 673 === 3.3.2 Set Interrupt Mode === ... ... @@ -680,7 +680,7 @@ 680 680 (% style="color:blue" %)**AT Command: AT+INTMOD** 681 681 682 682 (% border="1" cellspacing="4" style="background-color:#f2f2f2; width:510px" %) 683 -|=(% style="width: 155px;background-color:# 4F81BD;color:white" %)**Command Example**|=(% style="width: 197px;background-color:#4F81BD;color:white" %)**Function**|=(% style="width: 158px;background-color:#4F81BD;color:white" %)**Response**674 +|=(% style="width: 155px;background-color:#D9E2F3;color:#0070C0" %)**Command Example**|=(% style="width: 197px;background-color:#D9E2F3;color:#0070C0" %)**Function**|=(% style="width: 158px;background-color:#D9E2F3;color:#0070C0" %)**Response** 684 684 |(% style="width:154px" %)AT+INTMOD=?|(% style="width:196px" %)Show current interrupt mode|(% style="width:157px" %)((( 685 685 0 686 686 OK ... ... @@ -711,10 +711,10 @@ 711 711 712 712 Feature: use downlink to get firmware version. 713 713 714 -(% style="color: blue" %)**Downlink Command: 0x26**705 +(% style="color:#037691" %)**Downlink Command: 0x26** 715 715 716 716 (% border="1" cellspacing="5" style="background-color:#f2f2f2; width:492px" %) 717 -|(% style="background-color:# 4f81bd; color:white; width:191px" %)**Downlink Control Type**|(% style="background-color:#4f81bd; color:white; width:57px" %)**FPort**|(% style="background-color:#4f81bd; color:white; width:91px" %)**Type Code**|(% style="background-color:#4f81bd; color:white; width:153px" %)**Downlink payload size(bytes)**708 +|(% style="background-color:#d9e2f3; color:#0070c0; width:191px" %)**Downlink Control Type**|(% style="background-color:#d9e2f3; color:#0070c0; width:57px" %)**FPort**|(% style="background-color:#d9e2f3; color:#0070c0; width:91px" %)**Type Code**|(% style="background-color:#d9e2f3; color:#0070c0; width:153px" %)**Downlink payload size(bytes)** 718 718 |(% style="width:191px" %)Get Firmware Version Info|(% style="width:57px" %)Any|(% style="width:91px" %)26|(% style="width:151px" %)2 719 719 720 720 * Reply to the confirmation package: 26 01 ... ... @@ -725,15 +725,17 @@ 725 725 Configures info payload: 726 726 727 727 (% border="1" cellspacing="5" style="background-color:#f2f2f2; width:510px" %) 728 -|=(% style="background-color:# 4F81BD;color:white" %)(((719 +|=(% style="background-color:#D9E2F3;color:#0070C0" %)((( 729 729 **Size(bytes)** 730 -)))|=(% style="background-color:# 4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**1**|=(% style="background-color:#4F81BD;color:white" %)**5**|=(% style="background-color:#4F81BD;color:white" %)**1**721 +)))|=(% style="background-color:#D9E2F3;color:#0070C0" %)**1**|=(% style="background-color:#D9E2F3;color:#0070C0" %)**1**|=(% style="background-color:#D9E2F3;color:#0070C0" %)**1**|=(% style="background-color:#D9E2F3;color:#0070C0" %)**1**|=(% style="background-color:#D9E2F3;color:#0070C0" %)**1**|=(% style="background-color:#D9E2F3;color:#0070C0" %)**5**|=(% style="background-color:#D9E2F3;color:#0070C0" %)**1** 731 731 |**Value**|Software Type|((( 732 -Frequency Band 723 +Frequency 724 +Band 733 733 )))|Sub-band|((( 734 -Firmware Version 726 +Firmware 727 +Version 735 735 )))|Sensor Type|Reserve|((( 736 -[[Message Type>>||anchor="H2.3.7MessageType"]] 729 +[[Message Type>>||anchor="H2.3.7A0MessageType"]] 737 737 Always 0x02 738 738 ))) 739 739 ... ... @@ -803,7 +803,7 @@ 803 803 804 804 * Fix bugs. 805 805 806 -Firmware and changelog can be downloaded from : **[[Firmware download link>>url:https://www.dropbox.com/sh/ w1p7ukjrx49e62r/AAB3uCNCt-koYUvMkZUPBRSca?dl=0]]**799 +Firmware and changelog can be downloaded from : **[[Firmware download link>>url:https://www.dropbox.com/sh/ph4uyz0rchflrnw/AADr1f_5Sg30804NItpfOQbla?dl=0]]** 807 807 808 808 Methods to Update Firmware: 809 809 ... ... @@ -811,8 +811,6 @@ 811 811 812 812 * Update through UART TTL interface: **[[Instruction>>url:http://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H1.LoRaSTv4baseHardware]]**. 813 813 814 - 815 - 816 816 = 6. FAQ = 817 817 818 818 == 6.1 What is the frequency plan for LDS12-LB? == ... ... @@ -833,11 +833,11 @@ 833 833 834 834 835 835 ((( 836 -(% style="color:blue" %)**Cause ①**(%%)**:**Due to the physical principles of The LiDAR probe, the above phenomenon is likely to occur if the detection object is the material with high reflectivity (such as mirror, smooth floor tile, etc.) or transparent substance .(such as glass and water, etc.)827 +(% style="color:blue" %)**Cause ①**(%%)**:**Due to the physical principles of The LiDAR probe, the above phenomenon is likely to occur if the detection object is the material with high reflectivity (such as mirror, smooth floor tile, etc.) or transparent substance (such as glass and water, etc.) 837 837 ))) 838 838 839 839 ((( 840 - (% style="color:red" %)**Troubleshooting**(%%): Please avoid use of this product under such circumstance in practice.831 +Troubleshooting: Please avoid use of this product under such circumstance in practice. 841 841 ))) 842 842 843 843 ... ... @@ -846,7 +846,7 @@ 846 846 ))) 847 847 848 848 ((( 849 - (% style="color:red" %)**Troubleshooting**(%%): please use dry dust-free cloth to gently remove the foreign matter.840 +Troubleshooting: please use dry dust-free cloth to gently remove the foreign matter. 850 850 ))) 851 851 852 852 ... ... @@ -873,8 +873,6 @@ 873 873 874 874 * (% style="color:red" %)**CN470**(%%): LoRaWAN CN470 band 875 875 876 - 877 - 878 878 = 9. Packing Info = 879 879 880 880 ... ... @@ -892,8 +892,6 @@ 892 892 893 893 * Weight / pcs : g 894 894 895 - 896 - 897 897 = 10. Support = 898 898 899 899