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54	54	[[image:image-20220530002453-3.png||height="262" width="493"]]
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	57	+= Use AT Command =
57	57
	59	+== Access AT Commands ==
	60	+
	61	+GroPoint Air supports AT Command set in the stock firmware. You can use a USB to TTL adapter to connect to GroPoint Air for using AT command, as below.
	62	+
	63	+[[image:1654593668970-604.png]]
	64	+
	65	+**Connection:**
	66	+
	67	+(% style="background-color:yellow" %)** USB TTL GND <~-~-~-~-> GND**
	68	+
	69	+(% style="background-color:yellow" %)** USB TTL TXD <~-~-~-~-> UART_RXD**
	70	+
	71	+(% style="background-color:yellow" %)** USB TTL RXD <~-~-~-~-> UART_TXD**
	72	+
	73	+
	74	+In the PC, you need to set the serial baud rate to (% style="color:green" %)**9600**(%%) to access the serial console for GroPoint Air. GroPoint Air will output system info once power on as below:
	75	+
	76	+ [[image:1654653659449-932.png]]
	77	+
	78	+Valid AT Command please check [[Configure Device>>||anchor="H3.ConfigureLLMS01viaATCommandorLoRaWANDownlink"]].
	79	+
	80	+
58	58	= FAQ =
59	59
60	60	== How to change the LoRa Frequency Bands/Region ==
61	61
62		-You can follow the instruction here: [[how to upgrade image>>||anchor="H2.9200BFirmwareChangeLog"]].
	85	+You can follow the instruction here: [[how to upgrade image>>doc:Main.Firmware Upgrade Instruction for STM32 base products.WebHome||anchor="H2.HardwareUpgradeMethodSupportList"]].
63	63	When downloading the images, choose the required image file for download. ​
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65	65
66		-= 7. Trouble Shooting =
	89	+= Trouble Shooting =
67	67
68		-== 7.1 AT Commands input doesn’t work ==
	91	+== AT Commands input doesn’t work ==
69	69
70	70	In case if user can see the console output but can’t type input to the device. Please check if you already include the (% style="color:green" %)**ENTER**(%%) while sending out the command. Some serial tool doesn’t send (% style="color:green" %)**ENTER**(%%) while pressing the send key, user need to add ENTER in their string.
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