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1		-XWiki.Xiaoling
	1	+XWiki.Bei

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556	556
557	557	== 2.7 Calibration ==
558	558
	559	+Step1 : Clean probe
559	559
	561	+user can use high grade sandpaper to polish it or put in 5% hydrochloric acid for several minutes. After the metal probe looks new, users can clean it to remove hydrochloric acid or other liquids from the surface.
	562	+
	563	+Step2 : Immerse the sensor in ph buffer solution to make the sensor values stable
	564	+
560	560	(((
561	561	User can do calibration for the probe. It is limited to use below pH buffer solution to calibrate: 4.00, 6.86, 9.18. When calibration, user need to clean the electrode and put the probe in the pH buffer solution to wait the value stable ( a new clean electrode might need max 24 hours to be stable).
	567	+
	568	+Note：Only one ph buffer with one of the ph values needs to be calibrated during calibration. Wait for the sensor measurement value to be stable, it does not need to be the same as the ph marked by the ph buffer
	569	+
	570	+
	571	+Step3 : The numerically stable sensors were calibrated using commands
562	562	)))
563	563
564	564	(((
565		-After stable, user can use below command to calibrate.
	575	+ User can use below command to calibrate.
566	566
567	567	(% border="1" cellspacing="5" style="background-color:#f2f2f2; width:520px" %)
568	568	|(% style="background-color:#d9e2f3; color:#0070c0; width:120px" %)**pH buffer solution**|(% style="background-color:#d9e2f3; color:#0070c0; width:150px" %)**AT Command to calibrate**|(% style="background-color:#d9e2f3; color:#0070c0; width:150px" %)**Downlink Command**|(% style="background-color:#d9e2f3; color:#0070c0; width:100px" %)**Read Cal Value**
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590	590	)))
591	591	)))
592	592
	603	+To use the AT COMMAND, refer to this link:
593	593
	605	+* AT Command via Bluetooth Connection (**Recommended**): [[BLE Configure Instruction>>url:http://wiki.dragino.com/xwiki/bin/view/Main/BLE%20Bluetooth%20Remote%20Configure/]].
	606	+
	607	+* AT Command via UART Connection : See [[UART Connection>>url:http://wiki.dragino.com/xwiki/bin/view/Main/UART%20Access%20for%20LoRa%20ST%20v4%20base%20model/#H2.3UARTConnectionforSN50v3basemotherboard]].
	608	+
	609	+To use Downlink, take TTN as an example, please refer to this link:
	610	+
	611	+* LoRaWAN Downlink.  Instruction for different platforms: See [[IoT LoRaWAN Server>>url:http://wiki.dragino.com/xwiki/bin/view/Main/]] section.
	612	+
	613	+
	614	+When the command is successfully used, the node sends a uplink.
	615	+This is the payload for uplink
	616	+
594	594	(% style="color:#037691" %)**Calibration Payload**
595	595
596	596	(% border="1" cellspacing="5" style="background-color:#f2f2f2; width:500px" %)
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616	616
617	617	* Reply to non-confirmed packet: 14 00
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	642	+Step4：
	643	+
	644	+After the calibration is completed, its measurement results in this ph buffer solution should be consistent with the numerical value of the command used in the calibration
	645	+
	646	+Examples:
	647	+After using the command AT+PH=9 in 9.18ph buffer
	648	+The readout returned by the sensor in 9.18ph buffer should be pH=9
	649	+
	650	+
619	619	== 2.8 Frequency Plans ==
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