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...	...	@@ -1007,43 +1007,50 @@
1007	1007	* Example 2: Downlink Payload: 06000003 ~/~/ Set the interrupt mode to rising edge trigger
1008	1008
1009	1009
	1010	+
1010	1010	= 4.  FAQ =
1011	1011
1012		-== 4.1  What is the frequency plan for LDDS75? ==
	1013	+== 4.1  How to change the LoRa Frequency Bands/Region ==
1013	1013
1014		-LDDS75 use the same frequency as other Dragino products. User can see the detail from this link: [[Frequency band>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
1015		-
1016		-
1017		-
1018		-== 4.2  How to change the LoRa Frequency Bands/Region ==
1019		-
1020	1020	You can follow the instructions for [[how to upgrade image>>||anchor="H2.8A0200BFirmwareChangeLog"]].
1021	1021	When downloading the images, choose the required image file for download. ​
1022	1022
1023	1023
	1019	+= 5.  Trouble Shooting =
1024	1024
1025		-== 4.3  Can I use LDDS75 in condensation environment? ==
	1021	+== 5.1  AT Commands input doesn’t work ==
1026	1026
1027		-LDDS75 is not suitable to be used in condensation environment. Condensation on the LDDS75 probe will affect the reading and always got 0.
1028	1028
	1024	+(((
	1025	+In the 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 press the send key, user need to add ENTER in their string.
	1026	+)))
1029	1029
1030	1030
1031		-= 5.  Trouble Shooting =
	1029	+== 5.2  Significant error between the output distant value of LiDAR and actual distance ==
1032	1032
1033		-== 5.1  Why I can’t join TTN V3 in US915 / AU915 bands? ==
1034	1034
1035		-It is due to channel mapping. Please see below link:  [[Frequency band>>doc:Main.LoRaWAN Communication Debug.WebHome||anchor="H2.NoticeofUS9152FCN4702FAU915Frequencyband"]]
	1032	+(((
	1033	+(% style="color:blue" %)**Cause ①**(%%)**：**Due to the physical principles of The LiDAR probe, the above phenomenon is likely to occur if the detection object is the material with high reflectivity (such as mirror, smooth floor tile, etc.) or transparent substance (such as glass and water, etc.)
	1034	+)))
1036	1036
	1036	+(((
	1037	+Troubleshooting: Please avoid use of this product under such circumstance in practice.
	1038	+)))
1037	1037
1038		-== 5.2  AT Command input doesn't work ==
	1040	+(((
	1041	+
	1042	+)))
1039	1039
1040		-In the 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 press the send key, user need to add ENTER in their string.
	1044	+(((
	1045	+(% style="color:blue" %)**Cause ②**(%%)**: **The IR-pass filters are blocked.
	1046	+)))
1041	1041
1042	1042	(((
1043		-
	1049	+Troubleshooting: please use dry dust-free cloth to gently remove the foreign matter.
1044	1044	)))
1045	1045
1046	1046
	1053	+
1047	1047	= 6.  Order Info =
1048	1048
1049	1049