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1		-XWiki.Bei
	1	+XWiki.Xiaoling

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556	556
557	557	== 2.7 Calibration ==
558	558
559		-Step1 : Clean probe
560	560
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		-
565	565	(((
566	566	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
572	572	)))
573	573
574	574	(((
575		- User can use below command to calibrate.
	565	+After stable, user can use below command to calibrate.
576	576
577	577	(% border="1" cellspacing="5" style="background-color:#f2f2f2; width:520px" %)
578	578	|(% 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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600	600	)))
601	601	)))
602	602
603		-To use the AT COMMAND, refer to this link:
604	604
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		-
617	617	(% style="color:#037691" %)**Calibration Payload**
618	618
619	619	(% border="1" cellspacing="5" style="background-color:#f2f2f2; width:500px" %)
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639	639
640	640	* Reply to non-confirmed packet: 14 00
641	641
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		-
651	651	== 2.8 Frequency Plans ==
652	652
653	653