Changes for page LHT65N -- Manual do sensor de temperatura e umidade LoRaWAN
Last modified by Xiaoling on 2023/07/18 10:12
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... ... @@ -58,6 +58,8 @@ 58 58 * Tri-color LED to indicate working status 59 59 * Datalog feature 60 60 61 + 62 + 61 61 == 1.3 Specification == 62 62 63 63 ... ... @@ -82,6 +82,8 @@ 82 82 * ±2°C accuracy from -55°C to +125°C 83 83 * Operating Range: -55 °C ~~ 125 °C 84 84 87 + 88 + 85 85 = 2. Connect LHT65N to IoT Server = 86 86 87 87 == 2.1 How does LHT65N work? == ... ... @@ -263,9 +263,6 @@ 263 263 * The 7th byte (EXT #): defines the external sensor model. 264 264 * The 8(% _msthash="734578" _msttexthash="21372" _mstvisible="4" %)^^th^^(%%) ~~ 11(% _msthash="734579" _msttexthash="21372" _mstvisible="4" %)^^th^^(%%) byte: the value for external sensor value. The definition is based on external sensor type. (If EXT=0, there won’t be these four bytes.) 265 265 266 - 267 - 268 - 269 269 === 2.4.1 Decoder in TTN V3 === 270 270 271 271 When the uplink payload arrives TTNv3, it shows HEX format and not friendly to read. We can add LHT65N decoder in TTNv3 for friendly reading. ... ... @@ -296,9 +296,6 @@ 296 296 * BAT status=(0Xcba4>>14)&0xFF=11(B),very good 297 297 * Battery Voltage =0xCBF6&0x3FFF=0x0BA4=2980mV 298 298 299 - 300 - 301 - 302 302 === 2.4.3 Built-in Temperature === 303 303 304 304 [[image:image-20220522235639-2.png||_mstalt="431756" _mstvisible="3" height="138" width="722"]] ... ... @@ -309,9 +309,6 @@ 309 309 310 310 * Temperature: (0xF5C6-65536)/100=-26.18℃ 311 311 312 - 313 - 314 - 315 315 === 2.4.4 Built-in Humidity === 316 316 317 317 [[image:image-20220522235639-4.png||_mstalt="432484" _mstvisible="3" height="138" width="722"]] ... ... @@ -318,9 +318,6 @@ 318 318 319 319 * Humidity: 0x025C/10=60.4% 320 320 321 - 322 - 323 - 324 324 === 2.4.5 Ext # === 325 325 326 326 Bytes for External Sensor: ... ... @@ -467,16 +467,12 @@ 467 467 468 468 * (% _msthash="504956" _msttexthash="245037" _mstvisible="4" %)**Status & Ext Byte** 469 469 470 -(% border="1" cellspacing="8" style="background-color:#ffffcc; color:green; width:520px" %) 471 -|(% style="width:60px" %)**Bits**|(% style="width:90px" %)**7**|(% style="width:100px" %)**6**|(% style="width:90px" %)**5**|(% style="width:100px" %)**4**|(% style="width:60px" %)**[3:0]** 472 -|(% style="width:96px" %)**Status&Ext**|(% style="width:124px" %)None-ACK Flag|(% style="width:146px" %)Poll Message FLAG|(% style="width:109px" %)Sync time OK|(% style="width:143px" %)Unix Time Request|(% style="width:106px" %)Ext: 0b(1001) 462 +[[image:image-20220523152434-16.png||_mstalt="453921" _mstvisible="3"]] 473 473 474 -* (% style="color:blue" %)**Poll Message Flag**:(%%)1: This message is a poll message reply, 0: means this is a normal uplink.475 -* (% style="color:blue" %)**Sync time OK**:(%%)476 -* (% style="color:blue" %)**Unix Time Request**:(%%)1: Request server downlink Unix time, 0 : N/A. In this mode, LHT65N will set this bit to 1 every 10 days to request a time SYNC. (AT+SYNCMOD to set this)464 +* Poll Message Flag: 1: This message is a poll message reply, 0: means this is a normal uplink. 465 +* Sync time OK: 1: Set time ok,0: N/A. After time SYNC request is sent, LHT65N will set this bit to 0 until got the time stamp from the application server. 466 +* Unix Time Request: 1: Request server downlink Unix time, 0 : N/A. In this mode, LHT65N will set this bit to 1 every 10 days to request a time SYNC. (AT+SYNCMOD to set this) 477 477 478 - 479 - 480 480 ==== 2.4.6.3 Ext~=6, ADC Sensor (use with E2 Cable) ==== 481 481 482 482 In this mode, user can connect external ADC sensor to check ADC value. The 3V3_OUT can ... ... @@ -487,43 +487,8 @@ 487 487 488 488 AT+EXT=6,timeout (% _msthash="506085" _msttexthash="8782189" _mstvisible="3" style="color:red" %)Time to power this sensor, from 0 ~~ 65535ms 489 489 490 -For example: 491 491 492 -AT+EXT=6,1000 will power this sensor for 1000ms before sampling the ADC value. 493 493 494 - 495 -Or use **downlink command A2** to set the same. 496 - 497 -The measuring range of the node is only about 0.1V to 1.1V The voltage resolution is about 0.24mv. 498 - 499 -When the measured output voltage of the sensor is not within the range of 0.1V and 1.1V, the output voltage terminal of the sensor shall be divided The example in the following figure is to reduce the output voltage of the sensor by three times If it is necessary to reduce more times, calculate according to the formula in the figure and connect the corresponding resistance in series. 500 - 501 -[[image:image-20220628150112-1.png||height="241" width="285"]] 502 - 503 - 504 -When ADC_IN1 pin is connected to GND or suspended, ADC value is 0 505 - 506 -[[image:image-20220628150714-4.png]] 507 - 508 - 509 -When the voltage collected by ADC_IN1 is less than the minimum range, the minimum range will be used as the output; Similarly, when the collected voltage is greater than the maximum range, the maximum range will be used as the output. 510 - 511 -1) The minimum range is about 0.1V. Each chip has internal calibration, so this value is close to 0.1V 512 - 513 -[[image:image-20220628151005-5.png]] 514 - 515 - 516 -2) The maximum range is about 1.1V. Each chip has internal calibration, so this value is close to 1.1v 517 - 518 -[[image:image-20220628151056-6.png]] 519 - 520 - 521 -3) Within range 522 - 523 -[[image:image-20220628151143-7.png]] 524 - 525 - 526 - 527 527 == 2.5 Show data on Datacake == 528 528 529 529 ((( ... ... @@ -583,14 +583,9 @@ 583 583 584 584 There are two methods: 585 585 586 -1. IoT Server sends a downlink LoRaWAN command to [[poll the value>>||anchor="H2.6.4Pollsensorvalue"]] for specify ingtime range.587 -1. Set [[PNACKMD=1>>||anchor="H4.13AutoSendNone-ACKmessages"]], LHT65N will wait for ACK for every uplink, when there is no LoRaWAN network, LHT65N will store the sensor data, and it will send all messages after thenetwork recovery.539 +1. IoT Server sends a downlink LoRaWAN command to [[poll the value>>||anchor="H2.6.4Pollsensorvalue"]] for specify time range. 540 +1. Set [[PNACKMD=1>>||anchor="H4.13AutoSendNone-ACKmessages"]], LHT65N will wait for ACK for every uplink, when there is no LoRaWAN network, LHT65N will store the sensor data, and it will send all messages after network recover. 588 588 589 -Below is the typical case for the auto-update datalog feature (Set PNACKMD=1) 590 - 591 -[[image:image-20220703111700-2.png||height="381" width="1119"]] 592 - 593 - 594 594 === 2.6.2 Unix TimeStamp === 595 595 596 596 ... ... @@ -613,37 +613,20 @@ 613 613 614 614 === 2.6.3 Set Device Time === 615 615 616 -((( 617 617 There are two ways to set device's time: 618 -))) 619 619 620 -((( 621 621 **~1. Through LoRaWAN MAC Command (Default settings)** 622 -))) 623 623 624 -((( 625 625 User need to set SYNCMOD=1 to enable sync time via MAC command. 626 -))) 627 627 628 -((( 629 629 Once LHT65N Joined LoRaWAN network, it will send the MAC command (DeviceTimeReq) and the server will reply with (DeviceTimeAns) to send the current time to LHT65N. If LHT65N fails to get the time from the server, LHT65N will use the internal time and wait for next time request (AT+SYNCTDC to set the time request period, default is 10 days). 630 -))) 631 631 632 -((( 633 633 (% style="color:red" %)Note: LoRaWAN Server need to support LoRaWAN v1.0.3(MAC v1.0.3) or higher to support this MAC command feature, Chirpstack,TTN V3 v3 and loriot support but TTN V3 v2 doesn’t support. If server doesn’t support this command, it will through away uplink packet with this command, so user will lose the packet with time request for TTN V3 v2 if SYNCMOD=1. 634 -))) 635 635 636 -((( 637 - 638 -))) 639 639 640 -((( 641 641 **2. Manually Set Time** 642 -))) 643 643 644 -((( 645 645 User needs to set SYNCMOD=0 to manual time, otherwise, the user set time will be overwritten by the time set by the server. 646 -))) 647 647 648 648 649 649 ... ... @@ -810,11 +810,9 @@ 810 810 (% _mstvisible="2" %) 811 811 ((( 812 812 (% _msthash="736723" _msttexthash="2005003" _mstvisible="3" %) 813 -((( 814 814 Poll Message Flag: 1: This message is a poll message reply. 815 815 ))) 816 816 ))) 817 -))) 818 818 819 819 (% _mstvisible="1" %) 820 820 * (% _mstvisible="3" %) ... ... @@ -822,21 +822,17 @@ 822 822 (% _mstvisible="4" %) 823 823 ((( 824 824 (% _msthash="1197157" _msttexthash="561548" _mstvisible="5" %) 825 -((( 826 826 Poll Message Flag is set to 1. 827 827 ))) 828 828 ))) 829 -))) 830 830 * (% _mstvisible="3" %) 831 831 ((( 832 832 (% _mstvisible="4" %) 833 833 ((( 834 834 (% _msthash="1197158" _msttexthash="9284964" _mstvisible="5" %) 835 -((( 836 836 Each data entry is 11 bytes, to save airtime and battery, devices will send max bytes according to the current DR and Frequency bands. 837 837 ))) 838 838 ))) 839 -))) 840 840 841 841 (% _mstvisible="1" %) 842 842 ((( ... ... @@ -843,16 +843,12 @@ 843 843 (% _mstvisible="2" %) 844 844 ((( 845 845 (% _msthash="736724" _msttexthash="2242344" _mstvisible="3" %) 846 -((( 847 847 848 -))) 849 849 850 850 (% _msthash="736724" _msttexthash="2242344" _mstvisible="3" %) 851 -((( 852 852 For example, in US915 band, the max payload for different DR is: 853 853 ))) 854 854 ))) 855 -))) 856 856 857 857 (% _mstvisible="1" %) 858 858 ((( ... ... @@ -859,11 +859,9 @@ 859 859 (% _mstvisible="2" %) 860 860 ((( 861 861 (% _msthash="736725" _msttexthash="1065532" _mstvisible="3" %) 862 -((( 863 863 a) DR0: max is 11 bytes so one entry of data 864 864 ))) 865 865 ))) 866 -))) 867 867 868 868 (% _mstvisible="1" %) 869 869 ((( ... ... @@ -870,11 +870,9 @@ 870 870 (% _mstvisible="2" %) 871 871 ((( 872 872 (% _msthash="736726" _msttexthash="3265665" _mstvisible="3" %) 873 -((( 874 874 b) DR1: max is 53 bytes so devices will upload 4 entries of data (total 44 bytes) 875 875 ))) 876 876 ))) 877 -))) 878 878 879 879 (% _mstvisible="1" %) 880 880 ((( ... ... @@ -881,11 +881,9 @@ 881 881 (% _mstvisible="2" %) 882 882 ((( 883 883 (% _msthash="736727" _msttexthash="1454115" _mstvisible="3" style="text-align: left;" %) 884 -((( 885 885 c) DR2: total payload includes 11 entries of data 886 886 ))) 887 887 ))) 888 -))) 889 889 890 890 (% _mstvisible="1" %) 891 891 ((( ... ... @@ -892,11 +892,9 @@ 892 892 (% _mstvisible="2" %) 893 893 ((( 894 894 (% _msthash="736728" _msttexthash="1483924" _mstvisible="3" style="text-align: left;" %) 895 -((( 896 896 d) DR3: total payload includes 22 entries of data. 897 897 ))) 898 898 ))) 899 -))) 900 900 901 901 (% _mstvisible="1" %) 902 902 ((( ... ... @@ -903,11 +903,9 @@ 903 903 (% _mstvisible="2" %) 904 904 ((( 905 905 (% _msthash="736729" _msttexthash="5848349" _mstvisible="3" style="text-align: left;" %) 906 -((( 907 907 If devise doesn’t have any data in the polling time. Device will uplink 11 bytes of 0 908 908 ))) 909 909 ))) 910 -))) 911 911 912 912 913 913 (% _mstvisible="1" style="text-align: left;" %) ... ... @@ -953,99 +953,55 @@ 953 953 [[image:image-20220523001219-13.png||_mstalt="451204" _mstvisible="3" height="421" style="text-align:left" width="727"]] 954 954 955 955 (% _msthash="315271" _msttexthash="12012546" _mstvisible="1" style="text-align: left;" %) 956 -((( 957 957 7FFF089801464160065F977FFF088E014B41600660097FFF0885014E41600660667FFF0875015141600662BE7FFF086B015541600665167FFF08660155416006676E7FFF085F015A41600669C67FFF0857015D4160066C1E 958 -))) 959 959 960 960 (% _msthash="315237" _msttexthash="1385839" %) 961 -((( 962 962 Where the first 11 bytes is for the first entry: 963 -))) 964 964 965 965 (% _msthash="315238" _msttexthash="274846" %) 966 -((( 967 967 7FFF089801464160065F97 968 -))) 969 969 970 970 (% _msthash="315239" _msttexthash="617435" %) 971 -((( 972 972 Ext sensor data=0x7FFF/100=327.67 973 -))) 974 974 975 975 (% _msthash="315240" _msttexthash="270543" %) 976 -((( 977 977 Temp=0x0898/100=22.00 978 -))) 979 979 980 980 (% _msthash="315241" _msttexthash="211783" %) 981 -((( 982 982 Hum=0x0146/10=32.6 983 -))) 984 984 985 985 (% _msthash="315242" _msttexthash="1569776" %) 986 -((( 987 987 poll message flag & Ext=0x41,means reply data,Ext=1 988 -))) 989 989 990 990 (% _msthash="315243" _msttexthash="1120509" %) 991 -((( 992 992 Unix time is 0x60065F97=1611030423s=21/1/19 04:27:03 993 -))) 994 994 995 995 996 996 997 997 == 2.7 Alarm Mode == 998 998 999 -((( 1000 1000 when the device is in alarm mode, it checks the built-in sensor temperature for a short time. if the temperature exceeds the preconfigured range, it sends an uplink immediately. 1001 -))) 1002 1002 1003 -((( 1004 1004 (% style="color:red" %)Note: alarm mode adds a little power consumption, and we recommend extending the normal read time when this feature is enabled. 1005 -))) 1006 1006 1007 -((( 1008 1008 **AT COMMAND FOR ALARM MODE:** 1009 -))) 1010 1010 1011 1011 (% _mstvisible="1" class="box infomessage" %) 1012 1012 ((( 1013 -((( 1014 1014 **AT+WMOD=1**: Enable/disable alarm mode. (0: Disabled, 1: Enabled) 1015 -))) 1016 1016 1017 -((( 1018 1018 **AT+CITEMP=1**: The interval between checking the alarm temperature. (In minutes) 1019 -))) 1020 1020 1021 -((( 1022 1022 **AT+ARTEMP**: Gets or sets the alarm range of the internal temperature sensor 1023 -))) 1024 1024 1025 -((( 1026 1026 **AT+ARTEMP=? **: Gets the alarm range of the internal temperature sensor(% _mstvisible="3" style="display:none" %) 1027 -))) 1028 1028 1029 -((( 1030 1030 **AT+ARTEMP=45,105**: Set the internal temperature sensor alarm range from 45 to 105. 1031 1031 ))) 1032 -))) 1033 1033 1034 -(% style="color:#4f81bd" %)**Downlink Command: AAXXXXXXXXXXXXXX** 1035 1035 1036 -Total bytes: 8 bytes 1037 1037 1038 -**Example:**AA0100010001003C 1039 1039 1040 -WMOD=01 1041 - 1042 -CITEMP=0001 1043 - 1044 -TEMPlow=0001 1045 - 1046 -TEMPhigh=003C 1047 - 1048 - 1049 1049 == 2.8 LED Indicator == 1050 1050 1051 1051 The LHT65 has a triple color LED which for easy showing different stage . ... ... @@ -1055,7 +1055,7 @@ 1055 1055 In a normal working state: 1056 1056 1057 1057 * For each uplink, the BLUE LED or RED LED will blink once. 1058 -BLUE LED when external sensor is connected. 925 + BLUE LED when external sensor is connected. 1059 1059 * RED LED when external sensor is not connected 1060 1060 * For each success downlink, the PURPLE LED will blink once 1061 1061 ... ... @@ -1072,24 +1072,8 @@ 1072 1072 1073 1073 [[image:image-20220619092222-1.png||height="182" width="188"]][[image:image-20220619092313-2.png||height="182" width="173"]] 1074 1074 1075 - **1m long breakout cable for LHT65N. Features:**942 +1m long breakout cable for LHT65N 1076 1076 1077 -* ((( 1078 -Use for AT Command, works for both LHT52/LHT65N 1079 -))) 1080 -* ((( 1081 -Update firmware for LHT65N, works for both LHT52/LHT65N 1082 -))) 1083 -* ((( 1084 -Supports ADC mode to monitor external ADC 1085 -))) 1086 -* ((( 1087 -Supports Interrupt mode 1088 -))) 1089 -* ((( 1090 -Exposed All pins from the LHT65N Type-C connector. 1091 -))) 1092 - 1093 1093 [[image:image-20220619092421-3.png||height="371" width="529"]] 1094 1094 1095 1095 ... ... @@ -1111,48 +1111,26 @@ 1111 1111 1112 1112 = 4. Configure LHT65N via AT command or LoRaWAN downlink = 1113 1113 1114 -((( 1115 1115 Use can configure LHT65N via AT Command or LoRaWAN Downlink. 1116 -))) 1117 1117 1118 -* ((( 1119 -AT Command Connection: See [[FAQ>>||anchor="H6.FAQ"]]. 1120 -))) 967 +* AT Command Connection: See [[FAQ>>||anchor="H6.FAQ"]]. 1121 1121 1122 -* ((( 1123 -LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]] 1124 -))) 969 +* LoRaWAN Downlink instruction for different platforms: [[IoT LoRaWAN Server>>doc:Main.WebHome]] 1125 1125 1126 -((( 1127 1127 There are two kinds of commands to configure LHT65N, they are: 1128 -))) 1129 1129 1130 -* ((( 1131 -(% style="color:#4f81bd" %)**General Commands**. 1132 -))) 973 +* (% style="color:#4f81bd" %)**General Commands**. 1133 1133 1134 -((( 1135 1135 These commands are to configure: 1136 -))) 1137 1137 1138 -1. ((( 1139 -General system settings like: uplink interval. 1140 -))) 1141 -1. ((( 1142 -LoRaWAN protocol & radio-related commands. 1143 -))) 977 +1. General system settings like: uplink interval. 978 +1. LoRaWAN protocol & radio-related commands. 1144 1144 1145 -((( 1146 1146 They are the same for all Dragino Devices which supports DLWS-005 LoRaWAN Stack(Note~*~*). These commands can be found on the wiki: [[End Device Downlink Command>>doc:Main.End Device AT Commands and Downlink Command.WebHome]] 1147 -))) 1148 1148 1149 -* ((( 1150 -(% style="color:#4f81bd" %)**Commands special design for LHT65N** 1151 -))) 982 +* (% style="color:#4f81bd" %)**Commands special design for LHT65N** 1152 1152 1153 -((( 1154 1154 These commands are only valid for LHT65N, as below: 1155 -))) 1156 1156 1157 1157 1158 1158 == 4.1 Set Transmit Interval Time == ... ... @@ -1441,11 +1441,16 @@ 1441 1441 1442 1442 (% _msthash="506061" _msttexthash="170755" %)**Connection:** 1443 1443 1444 -* (% style="background-color:yellow" %)**USB to TTL GND <~-~->GND** 1445 -* (% style="background-color:yellow" %)**USB to TTL RXD <~-~-> D+** 1446 -* (% style="background-color:yellow" %)**USB to TTL TXD <~-~-> A11** 1447 -* (% style="background-color:yellow" %)**USB to TTL 3.3V <~-~-> D-** 1273 +(% _msthash="506062" _msttexthash="1187732" %) 1274 +**✓ (% style="background-color:yellow" %)USB to TTL GND <~-~->GND(%%)** 1448 1448 1276 +(% _msthash="506063" _msttexthash="1158313" %)**✓ **(% style="background-color:yellow" %)**USB to TTL RXD <~-~-> D+** 1277 + 1278 +(% _msthash="506064" _msttexthash="1175629" %)**✓ **(% style="background-color:yellow" %)**USB to TTL TXD <~-~-> A11** 1279 + 1280 +(% _msthash="506065" _msttexthash="1164696" %)**✓ **(% style="background-color:yellow" %)**USB to TTL 3.3V <~-~-> D-** 1281 + 1282 + 1449 1449 ((( 1450 1450 In PC, User needs to set serial tool(such as [[**putty**>>https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to (% style="color:green" %)**9600**(%%) to access to access serial console for LHT65N. The AT commands are disable by default and need to enter password (default:(% style="color:green" %)**123456**) (%%)to active it. Timeout to input AT Command is 5 min, after 5-minute, user need to input password again. User can use AT+DISAT command to disable AT command before timeout. 1451 1451 ))) ... ... @@ -1754,59 +1754,7 @@ 1754 1754 Finally, unplug the DuPont cable on port4, and then use the DuPont cable to short circuit port3 and port1 to reset the device. 1755 1755 1756 1756 1757 -== 6.6 Using USB-TYPE-C to connect to the computer using the AT command == 1758 1758 1759 -[[image:image-20220623110706-1.png]] 1760 - 1761 - 1762 -[[image:image-20220623112117-4.png||height="459" width="343"]] 1763 - 1764 -((( 1765 -In PC, User needs to set serial tool(such as [[**putty**>>https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to (% style="color:green" %)**9600** (%%)to access to access serial console for LHT65N. The AT commands are disable by default and need to enter password (default:(% style="color:green" %)**123456**(% style="color:red" %))(%%) to active it. Timeout to input AT Command is 5 min, after 5-minute, user need to input password again. User can use AT+DISAT command to disable AT command before timeout. 1766 -))) 1767 - 1768 - 1769 -Input password and ATZ to activate LHT65N,As shown below: 1770 - 1771 -[[image:image-20220615154519-3.png||height="672" width="807"]] 1772 - 1773 - 1774 -== 6.7 How to use USB-TYPE-C to connect PC to upgrade firmware? == 1775 - 1776 -[[image:image-20220623110706-1.png]] 1777 - 1778 -(% style="color:blue" %)**Step1**(%%): Install TremoProgrammer first. 1779 - 1780 -[[image:image-20220615170542-5.png]] 1781 - 1782 - 1783 -(% style="color:blue" %)**Step2**(%%):wiring method.(% style="display:none" %) 1784 - 1785 -(% _msthash="506146" _msttexthash="52173160" %) 1786 -First connect the four lines; 1787 - 1788 -(% _msthash="506146" _msttexthash="52173160" %) 1789 -[[image:image-20220623113959-5.png||height="528" width="397"]] 1790 - 1791 -(% _msthash="506146" _msttexthash="52173160" %) 1792 -Press and hold the start key to restart and enter (% _mstvisible="1" %)bootlaod(%%) mode. 1793 - 1794 -(% style="color:blue" %)**Step3:**(%%)Select the device port to be connected, baud rate and bin file to be downloaded. 1795 - 1796 -[[image:image-20220615171334-6.png]] 1797 - 1798 - 1799 -Click the (% style="color:blue" %)**start**(%%) button to start the firmware upgrade. 1800 - 1801 - 1802 -When this interface appears, it indicates that the download has been completed. 1803 - 1804 -[[image:image-20220620160723-8.png]] 1805 - 1806 - 1807 -Finally,restart reset device again 1808 - 1809 - 1810 1810 = 7. Order Info = 1811 1811 1812 1812
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