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                SM2120B    Us er Ma nual                   

http://www.sonbus.com/ 

Sha nghai Son

best Industrial Co., Ltd                                                                             Page1

 

 

SM2120B 

 

RS485 interface pH sensor 

User Manual   

 

File Version: V21.3.24

   

        SM2120B using the standard    RS485 bus MODBUS-RTU protocol,easy access to PLC

DCS and 

other instruments or systems for monitoring soil pH state quantities.The internal use of high -precision 

sensing core and related devices to ensure high reliability an d excellent long-term stability,can be 

customized RS232,RS485,CAN,4-20mA,DC0~5V\10V,ZIGBEE,Lora,WIFI,GPRS and other output 
methods. 

Summary of Contents for SM2120B

Page 1: ...he standard RS485 bus MODBUS RTU protocol easy access to PLC DCS and other instruments or systems for monitoring soil pH state quantities The internal use of high precision sensing core and related devices to ensure high reliability and excellent long term stability can be customized RS232 RS485 CAN 4 20mA DC0 5V 10V ZIGBEE Lora WIFI GPRS and other output methods ...

Page 2: ...ODBUS RTU standard protocol format all operation or reply commands are hexadecimal data The default device address is 1 when the device is shipped the default baud rate is 9600 8 n 1 1 Read Data Function id 0x03 Inquiry frame hexadecimal sending example Query 1 device 1 data the host computer sends the command 01 03 00 00 00 01 84 0A Device ID Function id Start Address Data Length CRC16 01 03 00 0...

Page 3: ...device address is 1 we want to change to 02 the command is 01 06 00 66 00 02 E8 14 Device ID Function id Start Address Destination CRC16 01 06 00 66 00 02 E8 14 After the change is successful the device will return information 02 06 00 66 00 02 E8 27 its format is parsed as shown in the following table Device ID Function id Start Address Destination CRC16 01 06 00 66 00 02 E8 27 Response should be...

Page 4: ... 03 00 6B 00 01 F5 D6 For the correct query command the device will respond for example the response data is 01 03 02 00 64 B9 AF the format of which is as shown in the following table Device ID Function id Data Length Data value CRC16 01 03 02 00 64 B9 AF In the response data the first byte 01 indicates the real address of the current device and 00 6B is the first state quantity correction value ...

Page 5: ... Ltd Page5 Contact Us Company Shanghai Sonbest Industrial Co Ltd Address Building 8 No 215 North east road Baoshan District Shanghai China Web http www sonbest com Web http www sonbus com SKYPE soobuu Email sale sonbest com Tel 86 021 51083595 66862055 66862075 66861077 ...

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