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853	853	|=**Button**|=(% style="width: 1420px;" %)**Feature**
854	854	|**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**
855	855	|**RST**|(% style="width:1420px" %)Reboot RS485
856		-|**PRO**|(% style="width:1420px" %)Use for upload image, see [[How to Update Image>>path:#upgrade_image]]
	856	+|**PRO**|(% style="width:1420px" %)Use for upload image, see [[How to Update Image>>||anchor="H6.1Howtoupgradetheimage3F"]]
857	857
858	858
859		-
860	860	== 3.8 LEDs ==
861	861
862	862	(% border="1" style="background-color:#f7faff; width:500px" %)
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864	864	|**PWR**|Always on if there is power
865	865	|**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.
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867	867	= 4. Case Study =
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869	869	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]]
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883	883	[[image:1654162368066-342.png]]
884	884
885	885
886		-More detail AT Command manual can be found at [[AT Command Manual>>||anchor="3.5ConfigureRS485-BLviaATorDownlink"]]
	886	+More detail AT Command manual can be found at [[AT Command Manual>>https://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
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888	888
889	889	== 5.2 Common AT Command Sequence ==
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975	975
976	976	**Step3: **Open flashloader; choose the correct COM port to update.
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978	978	(% 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.
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981	981	[[image:image-20220602175818-12.png]]
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1038	1038	* (% style="color:blue" %)**RU864**(%%): frequency bands RU864
1039	1039	* (% style="color:blue" %)**KZ865**(%%): frequency bands KZ865
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1041	1041	= 9.Packing Info =
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1054	1054	* Package Size / pcs : 14.5 x 8 x 5 cm
1055	1055	* Weight / pcs : 170g
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1057	1057	= 10. FCC Caution for RS485LN-US915 =
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1059	1059	Any Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
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1060	1060
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1061	1061	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.
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1064	1064	**IMPORTANT NOTE:**
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1066	1066	**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:
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1068	1068	—Reorient or relocate the receiving antenna.
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1070	1070	—Increase the separation between the equipment and receiver.
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1072	1072	—Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
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1074	1074	—Consult the dealer or an experienced radio/TV technician for help.
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1077	1077	**FCC Radiation Exposure Statement:**
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1079	1079	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.
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1082	1082	= 11. Support =
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1084		-* 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.
1085		-* 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]].
	1116	+* (((
	1117	+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.
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	1119	+* (((
	1120	+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]].
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