What baud rate does the DFRobot SEN0602 use by default?

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

What supply voltage does the DFRobot SEN0602 need?

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

How do I change the DFRobot SEN0602 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 SEN0602 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 SEN0602 not measure?

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

How many Modbus registers does the DFRobot SEN0602 expose?

This guide documents 5 registers, read with function code 0x03 and written with 0x06 where the register is RW. Documented entries include Soil moisture, Soil temperature, pH, Device address and Baud rate.

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DFRobot · RS-485 sensor

DFRobot

DFRobot SEN0602

DFRobot 3-in-1 — moisture, temperature, pH.

✓ Verified for SankhyaMoistureTemperaturepHVerification 0.95 · datasheet-confirmed

At a glance

The DFRobot SEN0602 is a 3-in-1 RS-485 soil probe reporting moisture, temperature and pH over Modbus-RTU on RS-485 at 9600 bps, 8N1, on DC 5–30 V. This guide documents 5 registers, default Modbus address 1. It does not report EC, N-P-K, salinity and others. For those on the same bus: EC → DFRobot SEN0603; N-P-K → DFRobot SEN0605. Sankhya firmware profile: DFROBOT_3in1_pH.

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_3in1_pH

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
0003H	40004	pH	uint16	0.1	pH	RO
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. Note pH is at 0x0003 not 0x0002 — no EC register in this sensor.

FAQ

Common questions

What baud rate does the DFRobot SEN0602 use by default?: 9600 bps, 8N1. It is a Modbus-RTU slave; default address 1.
What supply voltage does the DFRobot SEN0602 need?: DC 5–30 V (Low (RS-485 bus-powered class)).
How do I change the DFRobot SEN0602 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 SEN0602 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 SEN0602 not measure?: The DFRobot SEN0602 reports moisture, temperature and pH only — it does not report EC, N-P-K, salinity and TDS. On the same RS-485 bus, add EC: DFRobot SEN0603; N-P-K: DFRobot SEN0605; salinity: DFRobot SEN0603.
How many Modbus registers does the DFRobot SEN0602 expose?: This guide documents 5 registers, read with function code 0x03 and written with 0x06 where the register is RW. Documented entries include Soil moisture, Soil temperature, pH, Device address and Baud rate.

Alternatives

How this differs from similar models

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