Industrial Soil Sensor RS485

Industrial-Grade Soil Sensor: Measure multi-parameters of soil including Temperature, Moisture, pH, EC and Nitrogen, Phosphorus and Potassium (NPK). The output signal is RS485 and can be operated broad range of voltage from 5~30 VDC.

Soil Sensors Specifications

• Operating Voltage: 5 ~ 30 VDC
• Communication Protocol: RS485
• Temperature
  • Measurement Range: -40°C ~ 80 °C
  • Measurement Accuracy: ±0.5 °C
• Moisture Content
  • Measurement Range: 0 ~ 100 %
  • Measurement Accuracy: ±3 %
  • Measurement Range: 0 ~ 100 %
  • Measurement Accuracy: ±3 %
• Electrical Conductivity (EC).
  • Measurement Range: 0 ~ 20000 uS/cm
  • Measurement Resolution: 1 uS/cm
• pH
  • Measurement Range: 3 ~ 9
  • Measurement Resolution: 0.1
• NPK
  • Measurement Range: 0 ~ 2999 mg/kg
  • Measurement Resolution: 1 mg/kg

RS845 Communication Details

• Data Bits: 8-bit
• Parity Bits: NO
• Stop Bit: 1
• Error Checking: CRC
• Baud Rate: 2400, 4800 (default), 9600
• Device Address: 0x01
• Function Code: 0x03
• Data Code: 16 bits

3-in-1 Soil Sensor Parameters

• Request Frame (8 Bytes)

Address Code	Function Code	Start Address Register	Length of Register	CRC
0x01	0x03	0x00 0x00	0x00 0x03	0x05 0xCB

• Example of Response Frame (11 Bytes)

Address Code	Function Code	Byte Number	Moisture	Temperature	EC	CRC
0x01	0x03	0x06	0x01 0xEF	0x01 0x44	0x00 0x04	0xB5 0x59

• Byte Response Example Calculation
  • Moisture Content = (0x01 * 256 + 0xEF) * 0.1 = 49.5 %
  • Temperature = (0x01 * 256 + 0x44) * 0.1 = 32.4 °C
  • EC = (0x00 * 256 + 0x04) = 4 uS/cm

4-in-1 Soil Sensor Parameters

• Request Frame (8 Bytes)

Address Code	Function Code	Start Address Register	Length of Register	CRC
0x01	0x03	0x00 0x00	0x00 0x04	0x44 0x09

• Example of Response Frame (13 Bytes)

Address Code	Function Code	Byte Number	Moisture	Temperature	EC	pH	CRC
0x01	0x03	0x08	0x02 0x62	0x01 0x67	0x00 0x06	0x00 0x37	0xC2 0x06

• Byte Response Example Calculation
  • Moisture Content = (0x02 * 256 + 0x62) * 0.1 = 61.0 %
  • Temperature = (0x01 * 256 + 0x67) * 0.1 = 35.9 °C
  • EC = (0x00 * 256 + 0x06) = 6 uS/cm
  • pH = (0x00 * 256 + 0x37) * 0.1 = 5.5

7-in-1 Soil Sensor Parameters

• Request Frame (8 Bytes)

Address Code	Function Code	Start Address Register	Length of Register	CRC
0x01	0x03	0x00 0x00	0x00 0x07	0x04 0x08

• Example of Response Frame (19 Bytes)

Address Code	Function Code	Byte Number	Moisture	Temperature	EC	pH	Nitrogen (N)	Phosphorus (P)	Potassium (K)	CRC
0x01	0x03	0x0E	0x01 0xE6	0x01 0x55	0x05 0xDC	0x01 0x34	0x00 0x20	0x00 0x25	0x00 0x30	0x04 0x08

• Byte Response Example Calculation
  • Moisture Content = (0x01 * 256 + 0xE6) * 0.1 = 48.6 %
  • Temperature = (0x01 * 256 + 0x55) * 0.1 = 34.1 °C
  • EC = (0x05 * 256 + 0xDC) = 1500 uS/cm
  • pH = (0x01 * 256 + 0x34) * 0.1 = 3.08
  • N = (0x00 * 256 + 0x20) = 32 mg/kg
  • P = (0x00 * 256 + 0x25) = 37 mg/kg
  • K = (0x00 * 256 + 0x30) = 48 mg/kg

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