What baud rate does the DFRobot SEN0601 use by default?

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

What supply voltage does the DFRobot SEN0601 need?

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

How do I change the DFRobot SEN0601 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 SEN0601 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.

Does the DFRobot SEN0601 measure pH and N-P-K?

The DFRobot SEN0601 reports moisture, temperature, EC, salinity and TDS only — it does not report pH and N-P-K. On the same RS-485 bus, add pH: DFRobot SEN0603; N-P-K: DFRobot SEN0605.

How many Modbus registers does the DFRobot SEN0601 expose?

This guide documents 13 registers, read with function code 0x03 and written with 0x06 where the register is RW. Documented entries include Soil moisture, Soil temperature, Electrical conductivity, Salinity, TDS and Conductivity temperature coefficient.

Does the SEN0601 report pH?

No. Its five reported parameters are moisture, temperature, EC, salinity and TDS. Add a pH sensor or select a model that includes pH when that measurement is required.

Can it be used only to observe salinity?

Yes. All fields may be logged while the operator focuses on salinity or EC. The other readings provide context rather than imposing an automation workflow.

Home / Sensors / DFRobot SEN0601

DFRobot · RS-485 sensor

DFRobot

DFRobot SEN0601

DFRobot 5-in-1 — moisture, temp, EC, salinity, TDS.

✓ Verified for SankhyaMoistureTemperatureECSalinityTDSVerification 0.95 · datasheet-confirmed

At a glance

The DFRobot SEN0601 is a 5-in-1 RS-485 soil probe reporting moisture, temperature, EC, salinity and TDS over Modbus-RTU on RS-485 at 9600 bps, 8N1, on DC 5–30 V. This guide documents 13 registers, default Modbus address 1. It does not report pH and N-P-K. For those on the same bus: pH → DFRobot SEN0603; N-P-K → DFRobot SEN0605. Sankhya firmware profile: DFROBOT_5in1.

Sankhya Farms integration

Watch moisture and soluble-salt indicators together

The DFRobot SEN0601 is natively decoded by Sankhya's DFROBOT_5in1 profile. Moisture, signed temperature, EC, salinity and TDS are read at 9600 baud and delivered to the free cloud dashboard with their units and sensor identity intact. The node also knows which later registers are conversion coefficients and calibration offsets, preventing them from appearing as accidental telemetry.

This combination is useful wherever water content and conductivity need to be interpreted together: an orchard root zone, greenhouse bed, nursery container, home garden, salinity trial or a crop grown in coco, perlite or another solid substrate. A rising EC value in a drying medium is not the same observation as the same EC after irrigation, and a shared timeline makes that distinction easier to see. Salinity and TDS are conversion outputs associated with conductivity, not independent chemical analyses. For a hydroponic reservoir, use a probe specifically approved for continuous liquid immersion.

Dashboard path: SEN0601 → Sankhya RS-485 node → named moisture, temperature, EC, salinity and TDS series. No separate InfluxDB or Grafana setup is required.

Value lookup

Where are the SEN0601 values and coefficients?

The live block is straightforward: 0000H moisture ×0.1%, 0001H signed temperature ×0.1 °C, 0002H EC in µS/cm, 0003H salinity in mg/L and 0004H TDS in mg/L. Registers 0022H–0024H hold conversion coefficients, while 0050H onward contains calibration values. Sankhya charts the measurement block and treats the later words as configuration.

Does the SEN0601 report pH?: No. Its five reported parameters are moisture, temperature, EC, salinity and TDS. Add a pH sensor or select a model that includes pH when that measurement is required.
Can it be used only to observe salinity?: Yes. All fields may be logged while the operator focuses on salinity or EC. The other readings provide context rather than imposing an automation workflow.

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_5in1

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
0000H	40001	Soil moisture	uint16	0.1	%	RO
0001H	40002	Soil temperature	int16	0.1	°C	RO
0002H	40003	Electrical conductivity	uint16	1	uS/cm	RO
0003H	40004	Salinity	uint16	1	mg/L	RO
0004H	40005	TDS	uint16	1	mg/L	RO
0022H	40035	Conductivity temperature coefficient	uint16	0.1	%	RW
0023H	40036	Salinity conversion coefficient	uint16	0.01	—	RW
0024H	40037	TDS conversion coefficient	uint16	0.01	—	RW
0050H	40081	Temperature calibration	int16	0.1	°C	RW
0051H	40082	Moisture calibration	int16	0.1	%	RW
0052H	40083	Conductivity calibration	int16	1	uS/cm	RW
07D0H	42001	Device address	uint16	1	—	RW
07D1H	42002	Baud rate	uint16	1	—	RW

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).
Power-cycle the probe after a configuration write for the change to take effect.

Field notes

Notes & caveats

Official map.

FAQ

Common questions

What baud rate does the DFRobot SEN0601 use by default?: 9600 bps, 8N1. It is a Modbus-RTU slave; default address 1.
What supply voltage does the DFRobot SEN0601 need?: DC 5–30 V (Low (RS-485 bus-powered class)).
How do I change the DFRobot SEN0601 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 SEN0601 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.
Does the DFRobot SEN0601 measure pH and N-P-K?: The DFRobot SEN0601 reports moisture, temperature, EC, salinity and TDS only — it does not report pH and N-P-K. On the same RS-485 bus, add pH: DFRobot SEN0603; N-P-K: DFRobot SEN0605.
How many Modbus registers does the DFRobot SEN0601 expose?: This guide documents 13 registers, read with function code 0x03 and written with 0x06 where the register is RW. Documented entries include Soil moisture, Soil temperature, Electrical conductivity, Salinity, TDS and Conductivity temperature coefficient.

Alternatives

How this differs from similar models

How the DFRobot SEN0601 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 SEN0604	Sibling	Moisture, Temperature, EC, pH, Salinity, TDS	9600	Adds pH.
DFRobot SEN0603	Sibling	EC, pH, Salinity, TDS	9600	Adds pH, drops moisture and temperature.
DFRobot SEN0600	Sibling	Moisture, Temperature	9600	Drops EC, salinity and TDS.
DFRobot SEN0602	Sibling	Moisture, Temperature, pH	9600	Adds pH, drops EC, salinity and TDS.

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.