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856	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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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
868		-
869	869	= 4. Case Study =
870	870
871	871	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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885	885	[[image:1654162368066-342.png]]
886	886
887	887
888		-More detail AT Command manual can be found at [[AT Command Manual>>||anchor="H3.5ConfigureRS485-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/]]
889	889
890	890
891	891	== 5.2 Common AT Command Sequence ==
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977	977
978	978	**Step3: **Open flashloader; choose the correct COM port to update.
979	979
	978	+(((
980	980	(% 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	+)))
981	981
982	982
983	983	[[image:image-20220602175818-12.png]]