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	366	+== 2.6 Installation and Maintain ==
	367	+
	368	+=== 2.6.1 Before measurement ===
	369	+
	370	+(((
	371	+(((
	372	+If the LSPH01 has more than 7 days not use or just clean the pH probe. User should put the probe inside pure water for more than 24 hours for activation. If no put in water, user need to put inside soil for more than 24 hours to ensure the measurement accuracy.
	373	+)))
	374	+)))
	375	+
	376	+
	377	+
	378	+=== 2.6.2 Measurement ===
	379	+
	380	+
	381	+(((
	382	+(% style="color:#4f81bd" %)**Measurement the soil surface:**
	383	+)))
	384	+
	385	+(((
	386	+[[image:1654592946732-634.png]]
	387	+)))
	388	+
	389	+(((
	390	+Choose the proper measuring position. Split the surface soil according to the measured deep.
	391	+)))
	392	+
	393	+(((
	394	+Put pure water, or rainwater to make the soil of measurement point to moist mud. Remove rocks or hard things.
	395	+)))
	396	+
	397	+(((
	398	+Slowly insert the probe to the measure point. Don’t use large force which will break the probe. Make sure not shake when inserting.
	399	+)))
	400	+
	401	+(((
	402	+Put soil over the probe after insert. And start to measure.
	403	+)))
	404	+
	405	+(((
	406	+
	407	+)))
	408	+
	409	+(((
	410	+(% style="color:#4f81bd" %)**Measurement inside soil:**
	411	+)))
	412	+
	413	+(((
	414	+Dig a hole with diameter > 20CM.
	415	+)))
	416	+
	417	+(((
	418	+Insert the probe inside, method like measure the surface.
	419	+)))
	420	+
	421	+
	422	+
	423	+=== 2.6.3 Maintain Probe ===
	424	+
	425	+1. (((
	426	+pH probe electrode is fragile and no strong. User must avoid strong force or hitting it.
	427	+)))
	428	+1. (((
	429	+After long time use (3~~ 6  months). The probe electrode needs to be clean; user can use high grade sandpaper to polish it or put in 5% hydrochloric acid for several minutes. After the metal probe looks like new, user can use pure water to wash it.
	430	+)))
	431	+1. (((
	432	+Probe reference electrode is also no strong, need to avoid strong force or hitting.
	433	+)))
	434	+1. (((
	435	+User should keep reference electrode wet while not use.
	436	+)))
	437	+1. (((
	438	+Avoid the probes to touch oily matter. Which will cause issue in accuracy.
	439	+)))
	440	+1. (((
	441	+The probe is IP68 can be put in water.
	442	+
	443	+
	444	+
	445	+)))
	446	+
	447	+== 2.7 Calibration ==
	448	+
	449	+(((
	450	+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).
	451	+)))
	452	+
	453	+(((
	454	+After stable, user can use below command to calibrate.
	455	+)))
	456	+
	457	+[[image:image-20220607171149-4.png]]
	458	+
	459	+
	460	+(% style="color:#037691" %)**Calibration Payload**
	461	+
	462	+(% border="1" cellspacing="10" style="background-color:#ffffcc; color:green; width:510px" %)
	463	+|=(% style="width: 62.5px;" %)(((
	464	+**Size (bytes)**
	465	+)))|=(% style="width: 89px;" %)**1**|=(% style="width: 89px;" %)**1**|=(% style="width: 89px;" %)**1**|=(% style="width: 89px;" %)**7**|=(% style="width: 89px;" %)**1**
	466	+|**Value**|(((
	467	+PH4
	468	+
	469	+Calibrate value
	470	+)))|PH6.86 Calibrate value|(((
	471	+PH9.18
	472	+
	473	+Calibrate value
	474	+)))|Reserve|(((
	475	+[[Message Type>>||anchor="H2.3.6MessageType"]]
	476	+
	477	+Always 0x03
	478	+)))
	479	+
	480	+User can also send 0x14 downlink command to poll the current calibration payload.
	481	+
	482	+[[image:image-20220607171416-7.jpeg]]
	483	+
	484	+
	485	+* Reply to the confirmation package: 14 01
	486	+* Reply to non-confirmed packet: 14 00
	487	+
366	366	== 2.6  Frequency Plans ==
367	367
368	368	(((
...	...	@@ -448,6 +448,7 @@
448	448	* Use the Join successful sub-band if the server doesn’t include sub-band info in the OTAA Join Accept message ( TTN v2 doesn't include)
449	449
450	450
	573	+
451	451	=== 2.6.3 CN470-510 (CN470) ===
452	452
453	453	(((
...	...	@@ -558,6 +558,7 @@
558	558	* Check what sub-band the LoRaWAN server ask from the OTAA Join Accept message and switch to that sub-band
559	559	* Use the Join successful sub-band if the server doesn’t include sub-band info in the OTAA Join Accept message ( TTN v2 doesn't include)
560	560
	684	+
561	561	=== 2.6.5 AS920-923 & AS923-925 (AS923) ===
562	562
563	563	(((
...	...	@@ -786,6 +786,7 @@
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	913	+
789	789	== 2.8  ​Firmware Change Log ==
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