What baud rate does the DFRobot SEN0600 use by default?

9600 bps, 8N1. It is a Modbus-RTU slave; default address 1.

What supply voltage does the DFRobot SEN0600 need?

DC 5–30 V (Low (RS-485 bus-powered class)).

How do I change the DFRobot SEN0600 Modbus address?

Write the device-address register with function code 0x06, one device on the bus at a time, then power-cycle. See the Configuration section above.

Is the DFRobot SEN0600 compatible with the Sankhya platform?

Yes — it is in the Sankhya RS-485 sensor library and the firmware-generation pipeline can produce node firmware for it.

What does the DFRobot SEN0600 not measure?

The DFRobot SEN0600 reports moisture and temperature only — it does not report EC, pH, N-P-K, salinity and TDS. On the same RS-485 bus, add EC: DFRobot SEN0603; pH: DFRobot SEN0602; N-P-K: DFRobot SEN0605.

How many Modbus registers does the DFRobot SEN0600 expose?

This guide documents 6 registers, read with function code 0x03 and written with 0x06 where the register is RW. Documented entries include Soil moisture, Soil temperature, Temperature calibration, Moisture calibration, Device address and Baud rate.

Can the SEN0600 be used in a single raised bed?

Yes. RS-485 is not restricted to large farms. One sensor and one node can provide the same historical record for a garden, greenhouse or research container.

Does it measure EC or pH?

No. The SEN0600 reports moisture and temperature. DFRobot models with EC or pH are listed separately so the absent parameters are not inferred from the family name.

Home / Sensors / DFRobot SEN0600

DFRobot · RS-485 sensor

DFRobot

DFRobot SEN0600

DFRobot 2-in-1 capacitive moisture + temperature probe.

✓ Verified for SankhyaMoistureTemperatureVerification 0.95 · datasheet-confirmed

At a glance

The DFRobot SEN0600 is a 2-in-1 RS-485 soil probe reporting moisture and temperature over Modbus-RTU on RS-485 at 9600 bps, 8N1, on DC 5–30 V. This guide documents 6 registers, default Modbus address 1. It does not report EC, pH, N-P-K and others. For those on the same bus: EC → DFRobot SEN0603; pH → DFRobot SEN0602. Sankhya firmware profile: DFROBOT_2in1.

Sankhya Farms integration

From a SEN0600 probe to a usable moisture curve

Sankhya Farms supports the DFRobot SEN0600 with the DFROBOT_2in1 profile. The open-source node polls moisture and signed temperature at 9600 baud, applies the documented scales and sends the readings to the free cloud dashboard. Calibration words remain part of the model definition rather than being mistaken for live channels. A user can therefore move from a 5–30 V RS-485 probe to charts and history without building a separate gateway script and database.

The two measurements cover more than commercial soil monitoring. They can describe irrigation and drying in a home-garden bed, greenhouse bench, nursery pot, outdoor planter, propagation area or coco-based container. Temperature provides useful context for moisture changes and can flag an unusually cold or hot root zone. Sankhya can simply observe and retain these values; automation is optional. For liquid hydroponics, select a sensor rated for a reservoir rather than immersing a buried capacitive probe solely because its electronics use RS-485.

Supported now: SEN0600 data and calibration addresses are in the Sankhya library. The same repairable node can carry other documented RS-485 instruments on its bus.

Value lookup

How do I decode SEN0600 moisture and temperature?

Read holding registers 0000H and 0001H. Moisture is an unsigned word ×0.1%, while temperature is a signed word ×0.1 °C. The temperature and moisture calibration offsets are separate at 0050H and 0051H; they are configuration values, not additional observations. Sankhya applies the sensor profile before upload so negative temperatures and calibrated readings retain the correct meaning.

Can the SEN0600 be used in a single raised bed?: Yes. RS-485 is not restricted to large farms. One sensor and one node can provide the same historical record for a garden, greenhouse or research container.
Does it measure EC or pH?: No. The SEN0600 reports moisture and temperature. DFRobot models with EC or pH are listed separately so the absent parameters are not inferred from the family name.

Quick reference

Bus & electrical specs

Protocol

Modbus-RTU over RS-485

Default baud

9600 bps

Serial format

8N1

Function codes

0x03, 0x06

Supply voltage

DC 5–30 V

Power

Low (RS-485 bus-powered class)

Default address

Ingress / housing

IP68

Probe / element

316 stainless steel

Operating temp.

−40 to +80 °C (probe)

Firmware profile

DFROBOT_2in1

Specs sourced from: Official DFRobot wiki (SEN0600–SEN0605 product pages).

Modbus-RTU register map

Function codes 0x03, 0x06 at 9600 bps, 8N1. Data registers are read with 0x03; configuration registers are written with 0x06. PLC column shows the 4xxxx Modbus holding-register convention.

Register	PLC	Parameter	Type	Scale	Unit	R/W	Notes
0000H	40001	Soil moisture	uint16	0.1	%	RO
0001H	40002	Soil temperature	int16	0.1	°C	RO
0050H	40081	Temperature calibration	int16	0.1	°C	RW
0051H	40082	Moisture calibration	int16	0.1	%	RW
07D0H	42001	Device address	uint16	1	—	RW
07D1H	42002	Baud rate	uint16	1	—	RW	0=2400; 1=4800; 2=9600

Example poll

Worked query

Configuration

Changing address & baud rate

This probe is configured over the same RS-485 bus using Modbus write commands (function code 0x06). Configure one device at a time on the bus.

Set the Modbus slave address by writing register 07D0H (PLC 42001) with function code 0x06.
Set the baud rate by writing register 07D1H (PLC 42002). Values: 0=2400, 1=4800, 2=9600.
Power-cycle the probe after a configuration write for the change to take effect.

Field notes

Notes & caveats

Official map from DFRobot wiki.

FAQ

Common questions

What baud rate does the DFRobot SEN0600 use by default?: 9600 bps, 8N1. It is a Modbus-RTU slave; default address 1.
What supply voltage does the DFRobot SEN0600 need?: DC 5–30 V (Low (RS-485 bus-powered class)).
How do I change the DFRobot SEN0600 Modbus address?: Write the device-address register with function code 0x06, one device on the bus at a time, then power-cycle. See the Configuration section above.
Is the DFRobot SEN0600 compatible with the Sankhya platform?: Yes — it is in the Sankhya RS-485 sensor library and the firmware-generation pipeline can produce node firmware for it.
What does the DFRobot SEN0600 not measure?: The DFRobot SEN0600 reports moisture and temperature only — it does not report EC, pH, N-P-K, salinity and TDS. On the same RS-485 bus, add EC: DFRobot SEN0603; pH: DFRobot SEN0602; N-P-K: DFRobot SEN0605.
How many Modbus registers does the DFRobot SEN0600 expose?: This guide documents 6 registers, read with function code 0x03 and written with 0x06 where the register is RW. Documented entries include Soil moisture, Soil temperature, Temperature calibration, Moisture calibration, Device address and Baud rate.

Alternatives

How this differs from similar models

How the DFRobot SEN0600 compares with the other RS-485 models in the Sankhya library. "Drop-in" means the same parameter set and the same register map, read by the same firmware profile.

Model	Relationship	Measures	Baud	Difference
DFRobot SEN0601	Sibling	Moisture, Temperature, EC, Salinity, TDS	9600	Adds EC, salinity and TDS.
DFRobot SEN0602	Sibling	Moisture, Temperature, pH	9600	Adds pH.
DFRobot SEN0604	Sibling	Moisture, Temperature, EC, pH, Salinity, TDS	9600	Adds EC, pH, salinity and TDS.
DFRobot SEN0603	Sibling	EC, pH, Salinity, TDS	9600	Adds EC, pH, salinity and TDS, drops moisture and temperature.

Same family

Related DFRobot sensors

Run this sensor on a Sankhya node

Every sensor on this page is in our RS-485 library. Pick your model, and the firmware-generation pipeline builds the Modbus (or ASCII) polling code for an ESP32-S3 node — no hand-coding the register math.