Last modified by Karry Zhuang on 2025/03/06 16:34
<
From version < 57.2 >
edited by Xiaoling
on 2022/06/06 08:41
To version < 44.1 >
edited by Xiaoling
on 2022/06/02 16:53
>
Change comment: Uploaded new attachment "image-20220602165351-7.png", version {1}

Summary

Details

Page properties
Content
... ... @@ -74,10 +74,8 @@
74 74  * Preamble detection.
75 75  * 127 dB Dynamic Range RSSI.
76 76  * Automatic RF Sense and CAD with ultra-fast AFC.
77 -* Packet engine up to 256 bytes with CRC
77 +* Packet engine up to 256 bytes with CRC.
78 78  
79 -
80 -
81 81  == 1.3 Features ==
82 82  
83 83  * LoRaWAN Class A & Class C protocol (default Class C)
... ... @@ -587,6 +587,7 @@
587 587  **AT+PAYVER: Set PAYVER field = 1**
588 588  )))
589 589  
588 +
590 590  * **Downlink Payload:**
591 591  
592 592  **0xAE 01**  ~-~-> Set PAYVER field =  0x01
... ... @@ -597,9 +597,9 @@
597 597  
598 598  ==== **Set RS485 Sampling Commands** ====
599 599  
600 -AT+COMMANDx or AT+DATACUTx
599 +AT+COMMANDx, AT+DATACUTx and AT+SEARCHx
601 601  
602 -These three commands are used to configure how the RS485-LN polling data from Modbus device. Detail of usage please see : [[polling RS485 device>>||anchor="H3.3.3Configurereadcommandsforeachsampling"]].
601 +These three commands are used to configure how the RS485-BL polling data from Modbus device. Detail of usage please see : [[polling RS485 device>>||anchor="H3.3.3Configurereadcommandsforeachsampling"]].
603 603  
604 604  
605 605  * **AT Command:**
... ... @@ -614,7 +614,12 @@
614 614  **AT+DATACUTx: Configure how to handle return from RS485 devices.**
615 615  )))
616 616  
616 +(% class="box infomessage" %)
617 +(((
618 +**AT+SEARCHx: Configure search command**
619 +)))
617 617  
621 +
618 618  * **Downlink Payload:**
619 619  
620 620  **0xAF** downlink command can be used to set AT+COMMANDx or AT+DATACUTx.
... ... @@ -629,7 +629,7 @@
629 629  * NN:  0: no CRC; 1: add CRC-16/MODBUS ; 2: set the AT+DATACUT value.
630 630  * LL:  The length of AT+COMMAND or AT+DATACUT command
631 631  * XX XX XX XX: AT+COMMAND or AT+DATACUT command
632 -* YY:  If YY=0, RS485-BL will execute the downlink command without uplink; if YY=1, RS485-LN will execute an uplink after got this command.
636 +* YY:  If YY=0, RS485-BL will execute the downlink command without uplink; if YY=1, RS485-BL will execute an uplink after got this command.
633 633  
634 634  **Example:**
635 635  
... ... @@ -640,7 +640,17 @@
640 640  (% style="color:#037691" %)**AF 03 02 06 **(% style="color:orange" %)**0B**(% style="color:red" %)** 02 **(% style="color:green" %)**05 07 08 0A **(% style="color:#037691" %)**00**(%%): Same as AT+DATACUT3=(% style="color:orange" %)**11**(%%),(% style="color:red" %)**2**(%%),(% style="color:green" %)**5~~7+8~~10**
641 641  
642 642  
647 +**0xAB** downlink command can be used for set AT+SEARCHx
643 643  
649 +**Example:** **AB aa 01 03 xx xx xx** (03 here means there are total 3 bytes after 03) So
650 +
651 +* AB aa 01 03 xx xx xx  same as AT+SEARCHaa=1,xx xx xx
652 +* AB aa 02 03 xx xx xx 02 yy yy(03 means there are 3 bytes after 03, they are xx xx xx;02 means there are 2 bytes after 02, they are yy yy) so the commands
653 +
654 +**AB aa 02 03 xx xx xx 02 yy yy**  same as **AT+SEARCHaa=2,xx xx xx+yy yy**
655 +
656 +
657 +
644 644  ==== **Fast command to handle MODBUS device** ====
645 645  
646 646  AT+MBFUN is valid since v1.3 firmware version. The command is for fast configure to read Modbus devices. It is only valid for the devices which follow the [[MODBUS-RTU protocol>>url:https://www.modbustools.com/modbus.html]].
... ... @@ -647,32 +647,45 @@
647 647  
648 648  This command is valid since v1.3 firmware version
649 649  
650 -AT+MBFUN can auto read the Modbus function code: 01, 02, 03 or 04. AT+MBFUN has lower priority vs AT+DATACUT command. If AT+DATACUT command is configured, AT+MBFUN will be ignore.
651 651  
665 +**AT+MBFUN has only two value:**
652 652  
667 +* **AT+MBFUN=1**: Enable Modbus reading. And get response base on the MODBUS return
668 +
669 +AT+MBFUN=1, device can auto read the Modbus function code: 01, 02, 03 or 04. AT+MBFUN has lower priority vs AT+DATACUT command. If AT+DATACUT command is configured, AT+MBFUN will be ignore.
670 +
671 +* **AT+MBFUN=0**: Disable Modbus fast reading.
672 +
653 653  **Example:**
654 654  
655 -* AT+MBFUN=1 and AT+DATACUT1/AT+DATACUT2 are not configure (0,0,0). So RS485-LN.
675 +* AT+MBFUN=1 and AT+DATACUT1/AT+DATACUT2 are not configure (0,0,0).
656 656  * AT+COMMAND1= 01 03 00 10 00 08,1 ~-~-> read slave address 01 , function code 03, start address 00 01, quantity of registers 00 08.
657 657  * AT+COMMAND2= 01 02 00 40 00 10,1 ~-~-> read slave address 01 , function code 02, start address 00 40, quantity of inputs 00 10.
658 658  
659 -[[image:image-20220602165351-6.png]]
679 +[[image:1654133913295-597.png]]
660 660  
661 -[[image:image-20220602165351-7.png]]
662 662  
682 +[[image:1654133954153-643.png]]
663 663  
664 664  
685 +* **Downlink Commands:**
686 +
687 +**A9 aa** ~-~-> Same as AT+MBFUN=aa
688 +
689 +
690 +
665 665  ==== **RS485 command timeout** ====
666 666  
667 -Some Modbus device has slow action to send replies. This command is used to configure the RS485-LN to use longer time to wait for their action.
693 +Some Modbus device has slow action to send replies. This command is used to configure the RS485-BL to use longer time to wait for their action.
668 668  
669 -Default value: 0, range:  0 ~~ 65 seconds
695 +Default value: 0, range:  0 ~~ 5 seconds
670 670  
697 +
671 671  * **AT Command:**
672 672  
673 673  (% class="box infomessage" %)
674 674  (((
675 -**AT+CMDDLaa=hex(bb cc)*1000**
702 +**AT+CMDDLaa=hex(bb cc)**
676 676  )))
677 677  
678 678  **Example:**
... ... @@ -682,13 +682,13 @@
682 682  
683 683  * **Downlink Payload:**
684 684  
685 -**0x AA aa bb cc**
712 +0x AA aa bb cc
686 686  
687 -Same as: AT+CMDDLaa=hex(bb cc)*1000
714 +Same as: AT+CMDDLaa=hex(bb cc)
688 688  
689 689   **Example:**
690 690  
691 - 0xAA 01 00 01  ~-~-> Same as **AT+CMDDL1=1000 ms**
718 + **0xAA 01 03 E8**  ~-~-> Same as **AT+CMDDL1=1000 ms**
692 692  
693 693  
694 694  
... ... @@ -723,34 +723,27 @@
723 723  
724 724  Ask device to send an uplink immediately.
725 725  
726 -* **AT Command:**
727 -
728 -No AT Command for this, user can press the [[ACT button>>path:#Button]] for 1 second for the same.
729 -
730 -
731 731  * **Downlink Payload:**
732 732  
733 -**0x08 FF**, RS485-LN will immediately send an uplink.
755 +**0x08 FF**, RS485-BL will immediately send an uplink.
734 734  
735 735  
736 -==== ====
737 737  
738 738  ==== **Clear RS485 Command** ====
739 739  
740 740  The AT+COMMANDx and AT+DATACUTx settings are stored in special location, user can use below command to clear them.
741 741  
763 +
742 742  * **AT Command:**
743 743  
744 -**AT+CMDEAR=mm,nn**   mm: start position of erase ,nn: stop position of erase
766 +(% style="color:#037691" %)**AT+CMDEAR=mm,nn** (%%) mm: start position of erase ,nn: stop position of erase Etc. AT+CMDEAR=1,10 means erase AT+COMMAND1/AT+DATACUT1 to AT+COMMAND10/AT+DATACUT10
745 745  
746 -Etc. AT+CMDEAR=1,10 means erase AT+COMMAND1/AT+DATACUT1 to AT+COMMAND10/AT+DATACUT10
747 -
748 748  Example screen shot after clear all RS485 commands. 
749 749  
750 750  
751 751  The uplink screen shot is:
752 752  
753 -[[image:1654160691922-496.png]][[image:file:///C:/Users/93456/AppData/Local/Temp/msohtmlclip1/01/clip_image001.png]]
773 +[[image:1654134704555-320.png]]
754 754  
755 755  
756 756  * **Downlink Payload:**
... ... @@ -801,279 +801,22 @@
801 801  A7 03 aa: Same as  AT+STOPBIT=aa  (aa value: 00 , 01 or 02)
802 802  
803 803  
804 -== 3.6 Listening mode for RS485 network ==
805 805  
806 -This feature support since firmware v1.4
825 +==== **Control output power duration** ====
807 807  
808 -RS485-LN supports listening mode, it can listen the RS485 network packets and send them via LoRaWAN uplink. Below is the structure. The blue arrow shows the RS485 network packets to RS485-LN.
827 +User can set the output power duration before each sampling.
809 809  
810 -[[image:image-20220602171200-8.png||height="567" width="1007"]]
829 +* **AT Command:**
811 811  
812 -To enable the listening mode, use can run the command AT+RXMODE.
831 +**Example:**
813 813  
833 +**AT+3V3T=1000**  ~/~/ 3V3 output power will open 1s before each sampling.
814 814  
815 -(% border="1" style="background-color:#ffffcc; width:500px" %)
816 -|=(% style="width: 161px;" %)**Command example:**|=(% style="width: 337px;" %)**Function**
817 -|(% style="width:161px" %)AT+RXMODE=1,10 |(% style="width:337px" %)Enable listening mode 1, if RS485-LN has received more than 10 RS485 commands from the network. RS485-LN will send these commands via LoRaWAN uplinks.
818 -|(% style="width:161px" %)AT+RXMODE=2,500|(% style="width:337px" %)Enable listening mode 2, RS485-LN will capture and send a 500ms content once from the first detect of character. Max value is 65535 ms
819 -|(% style="width:161px" %)AT+RXMODE=0,0|(% style="width:337px" %)Disable listening mode. This is the default settings.
820 -|(% style="width:161px" %) |(% style="width:337px" %)A6 aa bb cc  same as AT+RXMODE=aa,(bb<<8 ~| cc)
835 +**AT+5VT=1000**  ~/~/ +5V output power will open 1s before each sampling.
821 821  
822 -**Downlink Command:**
823 823  
824 -**0xA6 aa bb cc ** same as AT+RXMODE=aa,(bb<<8 | cc)
838 +* **LoRaWAN Downlink Command:**
825 825  
840 +**07 01 aa bb**  Same as AT+5VT=(aa bb)
826 826  
827 -**Example**:
828 -
829 -The RS485-LN is set to AT+RXMODE=2,1000
830 -
831 -There is a two Modbus commands in the RS485 network as below:
832 -
833 -The Modbus master send a command: (% style="background-color:#ffc000" %)01 03 00 00 00 02 c4 0b
834 -
835 -And Modbus slave reply with: (% style="background-color:green" %)01 03 04 00 00 00 00 fa 33
836 -
837 -RS485-LN will capture both and send the uplink: (% style="background-color:#ffc000" %)01 03 00 00 00 02 c4 0b  (% style="background-color:green" %)01 03 04 00 00 00 00 fa 33
838 -
839 -[[image:image-20220602171200-9.png]]
840 -
841 -
842 -(% style="color:red" %)Notice: Listening mode can work with the default polling mode of RS485-LN. When RS485-LN is in to send the RS485 commands (from AT+COMMANDx), the listening mode will be interrupt for a while.
843 -
844 -
845 -== 3.7 Buttons ==
846 -
847 -
848 -(% border="1" style="background-color:#f7faff; width:500px" %)
849 -|=**Button**|=(% style="width: 1420px;" %)**Feature**
850 -|**ACT**|(% style="width:1420px" %)If RS485 joined in network, press this button for more than 1 second, RS485 will upload a packet, and the SYS LED will give a (% style="color:blue" %)**Blue blink**
851 -|**RST**|(% style="width:1420px" %)Reboot RS485
852 -|**PRO**|(% style="width:1420px" %)Use for upload image, see [[How to Update Image>>path:#upgrade_image]]
853 -
854 -== 3.8 LEDs ==
855 -
856 -(% border="1" style="background-color:#f7faff; width:500px" %)
857 -|=**LEDs**|=**Feature**
858 -|**PWR**|Always on if there is power
859 -|**SYS**|After device is powered on, the SYS will (% style="color:green" %)**fast blink in GREEN** (%%)for 5 times, means RS485-LN start to join LoRaWAN network. If join success, SYS will be (% style="color:green" %)**on GREEN for 5 seconds**(%%)**. **SYS will (% style="color:green" %)**blink Blue**(%%) on every upload and (% style="color:green" %)**blink Green**(%%) once receive a downlink message.
860 -
861 -= 4. Case Study =
862 -
863 -User can check this URL for some case studies: [[APP RS485 COMMUNICATE WITH SENSORS>>doc:Main.Application Note \: Communicate with Different Sensors ----- RS485-LN RS485-BL.WebHome]]
864 -
865 -
866 -= 5. Use AT Command =
867 -
868 -== 5.1 Access AT Command ==
869 -
870 -RS485-BL supports AT Command set. User can use a USB to TTL adapter plus the 3.5mm Program Cable to connect to RS485-BL to use AT command, as below.
871 -
872 -[[image:1654162355560-817.png]]
873 -
874 -
875 -In PC, User needs to set (% style="color:blue" %)**serial tool**(%%)(such as [[putty>>url:https://www.chiark.greenend.org.uk/~~sgtatham/putty/latest.html]], SecureCRT) baud rate to (% style="color:green" %)**9600**(%%) to access to access serial console of RS485-BL. The default password is 123456. Below is the output for reference:
876 -
877 -[[image:1654162368066-342.png]]
878 -
879 -
880 -More detail AT Command manual can be found at [[AT Command Manual>>||anchor="3.5ConfigureRS485-BLviaATorDownlink"]]
881 -
882 -
883 -== 5.2 Common AT Command Sequence ==
884 -
885 -=== 5.2.1 Multi-channel ABP mode (Use with SX1301/LG308) ===
886 -
887 -If device has not joined network yet:
888 -
889 -(% class="box infomessage" %)
890 -(((
891 -**AT+FDR**
892 -)))
893 -
894 -(% class="box infomessage" %)
895 -(((
896 -**AT+NJM=0**
897 -)))
898 -
899 -(% class="box infomessage" %)
900 -(((
901 -**ATZ**
902 -)))
903 -
904 -
905 -If device already joined network:
906 -
907 -(% class="box infomessage" %)
908 -(((
909 -**AT+NJM=0**
910 -)))
911 -
912 -(% class="box infomessage" %)
913 -(((
914 -**ATZ**
915 -)))
916 -
917 -
918 -=== 5.5.2 Single-channel ABP mode (Use with LG01/LG02) ===
919 -
920 -
921 -(% style="background-color:#dcdcdc" %)**AT+FDR** (%%) Reset Parameters to Factory Default, Keys Reserve
922 -
923 -(% style="background-color:#dcdcdc" %)**AT+NJM=0 **(%%)Set to ABP mode
924 -
925 -(% style="background-color:#dcdcdc" %)**AT+ADR=0** (%%)Set the Adaptive Data Rate Off
926 -
927 -(% style="background-color:#dcdcdc" %)**AT+DR=5**   (%%)Set Data Rate
928 -
929 -(% style="background-color:#dcdcdc" %)**AT+TDC=60000** (%%) Set transmit interval to 60 seconds
930 -
931 -(% style="background-color:#dcdcdc" %)**AT+CHS=868400000**(%%) Set transmit frequency to 868.4Mhz
932 -
933 -(% style="background-color:#dcdcdc" %)**AT+RX2FQ=868400000** (%%) Set RX2Frequency to 868.4Mhz (according to the result from server)
934 -
935 -(% style="background-color:#dcdcdc" %)**AT+RX2DR=5**  (%%) Set RX2DR to match the downlink DR from server. see below
936 -
937 -(% style="background-color:#dcdcdc" %)**AT+DADDR=26** (%%) 01 1A F1 Set Device Address to 26 01 1A F1, this ID can be found in the LoRa Server portal.
938 -
939 -(% style="background-color:#dcdcdc" %)**ATZ**       (%%) Reset MCU
940 -
941 -
942 -(% style="color:red" %)**Note:**
943 -
944 -(% style="color:red" %)1. Make sure the device is set to ABP mode in the IoT Server.
945 -2. Make sure the LG01/02 gateway RX frequency is exactly the same as AT+CHS setting.
946 -3. Make sure SF / bandwidth setting in LG01/LG02 match the settings of AT+DR. refer [[this link>>url:http://www.dragino.com/downloads/index.php?dir=LoRa_Gateway/&file=LoRaWAN%201.0.3%20Regional%20Parameters.xlsx]] to see what DR means.
947 -4. The command AT+RX2FQ and AT+RX2DR is to let downlink work. to set the correct parameters, user can check the actually downlink parameters to be used. As below. Which shows the RX2FQ should use 868400000 and RX2DR should be 5
948 -
949 -[[image:1654162478620-421.png]]
950 -
951 -
952 -= 6. FAQ =
953 -
954 -== 6.1 How to upgrade the image? ==
955 -
956 -The RS485-LN LoRaWAN Controller is shipped with a 3.5mm cable, the cable is used to upload image to RS485-LN to:
957 -
958 -* Support new features
959 -* For bug fix
960 -* Change LoRaWAN bands.
961 -
962 -Below shows the hardware connection for how to upload an image to RS485-LN:
963 -
964 -[[image:1654162535040-878.png]]
965 -
966 -**Step1:** Download [[flash loader>>url:https://www.st.com/content/st_com/en/products/development-tools/software-development-tools/stm32-software-development-tools/stm32-programmers/flasher-stm32.html]].
967 -
968 -**Step2**: Download the [[LT Image files>>url:http://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/image/]].
969 -
970 -**Step3: **Open flashloader; choose the correct COM port to update.
971 -
972 -(% style="color:blue" %) Hold down the PRO button and then momentarily press the RST reset button and the SYS led will change from OFF to ON, While SYS LED is RED ON, it means the RS485-LN is ready to be program.
973 -
974 -
975 -[[image:image-20220602175818-12.png]]
976 -
977 -
978 -[[image:image-20220602175848-13.png]]
979 -
980 -
981 -[[image:image-20220602175912-14.png]]
982 -
983 -
984 -**Notice**: In case user has lost the program cable. User can hand made one from a 3.5mm cable. The pin mapping is:
985 -
986 -[[image:image-20220602175638-10.png]]
987 -
988 -
989 -== 6.2 How to change the LoRa Frequency Bands/Region? ==
990 -
991 -User can follow the introduction for [[how to upgrade image>>||anchor="H6.1Howtoupgradetheimage3F"]]. When download the images, choose the required image file for download.
992 -
993 -
994 -== 6.3 How many RS485-Slave can RS485-BL connects? ==
995 -
996 -The RS485-BL can support max 32 RS485 devices. Each uplink command of RS485-BL can support max 16 different RS485 command. So RS485-BL can support max 16 RS485 devices pre-program in the device for uplink. For other devices no pre-program, user can use the [[downlink message (type code 0xA8) to poll their info>>||anchor="H3.3.3Configurereadcommandsforeachsampling"]].
997 -
998 -
999 -== 6.4 Compatible question to ChirpStack and TTI LoRaWAN server ? ==
1000 -
1001 -When user need to use with ChirpStack or TTI. Please set AT+RPL=4.
1002 -
1003 -Detail info check this link: [[Set Packet Receiving Response Level>>doc:Main.End Device AT Commands and Downlink Command.WebHome||anchor="H7.23SetPacketReceivingResponseLevel"]]
1004 -
1005 -
1006 -= 7. Trouble Shooting =
1007 -
1008 -== 7.1 Downlink doesn’t work, how to solve it? ==
1009 -
1010 -Please see this link for debug: [[LoRaWAN Communication Debug>>doc:Main.LoRaWAN Communication Debug.WebHome]]
1011 -
1012 -
1013 -== 7.2 Why I can’t join TTN V3 in US915 /AU915 bands? ==
1014 -
1015 -It might about the channels mapping. Please see for detail: [[Notice of Frequency band>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1016 -
1017 -
1018 -= 8. Order Info =
1019 -
1020 -(% style="color:blue" %)**Part Number: RS485-LN-XXX**
1021 -
1022 -(% style="color:blue" %)**XXX:**
1023 -
1024 -* (% style="color:blue" %)**EU433**(%%): frequency bands EU433
1025 -* (% style="color:blue" %)**EU868**(%%): frequency bands EU868
1026 -* (% style="color:blue" %)**KR920**(%%): frequency bands KR920
1027 -* (% style="color:blue" %)**CN470**(%%): frequency bands CN470
1028 -* (% style="color:blue" %)**AS923**(%%): frequency bands AS923
1029 -* (% style="color:blue" %)**AU915**(%%): frequency bands AU915
1030 -* (% style="color:blue" %)**US915**(%%): frequency bands US915
1031 -* (% style="color:blue" %)**IN865**(%%): frequency bands IN865
1032 -* (% style="color:blue" %)**RU864**(%%): frequency bands RU864
1033 -* (% style="color:blue" %)**KZ865**(%%): frequency bands KZ865
1034 -
1035 -= 9.Packing Info =
1036 -
1037 -
1038 -**Package Includes**:
1039 -
1040 -* RS485-LN x 1
1041 -* Stick Antenna for LoRa RF part x 1
1042 -* Program cable x 1
1043 -
1044 -**Dimension and weight**:
1045 -
1046 -* Device Size: 13.5 x 7 x 3 cm
1047 -* Device Weight: 105g
1048 -* Package Size / pcs : 14.5 x 8 x 5 cm
1049 -* Weight / pcs : 170g
1050 -
1051 -= 10. FCC Caution for RS485LN-US915 =
1052 -
1053 -Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
1054 -
1055 -This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
1056 -
1057 -
1058 -**IMPORTANT NOTE:**
1059 -
1060 -**Note: **This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:
1061 -
1062 -—Reorient or relocate the receiving antenna.
1063 -
1064 -—Increase the separation between the equipment and receiver.
1065 -
1066 -—Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
1067 -
1068 -—Consult the dealer or an experienced radio/TV technician for help.
1069 -
1070 -
1071 -**FCC Radiation Exposure Statement:**
1072 -
1073 -This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.This equipment should be installed and operated with minimum distance 20cm between the radiator& your body.
1074 -
1075 -
1076 -= 11. Support =
1077 -
1078 -* 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.
1079 -* 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]].
842 +**07 02 aa bb**  Same as AT+3V3T=(aa bb)
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