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309	309	The equipment should be calibrated before each use. For long-term use, it is recommended to calibrate once every 3 months. The calibration frequency should be adjusted appropriately according to different application conditions (degree of dirt in the application, deposition of chemical substances, etc.). After aging, the electrodes should be replaced in time.
310	310	)))
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	312	+
312	312	== 2.6 RS485 Commands ==
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	315	+
314	314	RS485 signaldefault address 0x10
315	315	Standard Modbus-RTU protocol, baud rate: 9600; check bit: none; data bit: 8; stop bit: 1
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	319	+
317	317	=== 2.6.1 Query address ===
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319	319	send
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321	321	(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:676.25px" %)
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328	328	|=(% style="width: 50px;background-color:#4F81BD;color:white" %)New address|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Function code|=(% style="width: 106px; background-color: rgb(79, 129, 189); color: white;" %)Data length|=(% style="width: 93px; background-color: rgb(79, 129, 189); color: white;" %)CRC16 low|=(% style="width: 104px; background-color: rgb(79, 129, 189); color: white;" %)CRC16 high
329	329	|(% style="width:99px" %)0X01|(% style="width:112px" %)0X03|(% style="width:106px" %)0X00|(% style="width:93px" %)0X20|(% style="width:104px" %)0XF0
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	335	+
331	331	=== 2.6.2 Change address ===
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333	333	For example: Change the address of the sensor with address 1 to 2, master → slave