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856	856	|**PRO**|(% style="width:1420px" %)Use for upload image, see [[How to Update Image>>||anchor="H6.1Howtoupgradetheimage3F"]]
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858	858
	859	+
859	859	== 3.8 LEDs ==
860	860
861	861	(% border="1" style="background-color:#f7faff; width:500px" %)
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864	864	|**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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	868	+
867	867	= 4. Case Study =
868	868
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>>https://www.dragino.com/downloads/index.php?dir=LT_LoRa_IO_Controller/LT33222-L/]]
	888	+More detail AT Command manual can be found at [[AT Command Manual>>||anchor="H3.5ConfigureRS485-BLviaATorDownlink"]]
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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.
977	977
978		-(((
979	979	(% 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.
980		-)))
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982	982
983	983	[[image:image-20220602175818-12.png]]