What baud rate does the SN-3001-TR-ECTHPH-N01 use by default?

4800 bps, 8N1. It is a Modbus-RTU slave; default address 1.

What supply voltage does the SN-3001-TR-ECTHPH-N01 need?

DC 4.5–30 V (≤ 0.5 W (24 V DC)).

How do I change the SN-3001-TR-ECTHPH-N01 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 SN-3001-TR-ECTHPH-N01 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 SN-3001-TR-ECTHPH-N01 measure N-P-K?

The SN-3001-TR-ECTHPH-N01 reports moisture, temperature, EC, pH, salinity and TDS only — it does not report N-P-K. On the same RS-485 bus, add N-P-K: SN-3002-TR-ECTHNPKPH-N01.

Is the SN-3001-TR-ECTHPH-N01 the same as the Renke RS-ECTHPH-N01-TR-1?

They are register-compatible, not identical products. Both expose the same parameter set and the same Modbus register map, and Sankhya reads both with the ZTS_4in1_ECTHPH firmware profile. Housing, cable gland and probe material can differ between vendors, so check the electrical specs above before substituting one for the other.

Home / Sensors / SN-3001-TR-ECTHPH-N01

SN · RS-485 sensor

Puruisenshe (普锐森社)

SN-3001-TR-ECTHPH-N01

4-in-1 probe (ZTS-compatible) — moisture, temp, EC, pH.

✓ Verified for SankhyaMoistureTemperatureECpHSalinityTDSVerification 0.95 · datasheet-confirmed

At a glance

The SN-3001-TR-ECTHPH-N01 is a 6-in-1 RS-485 soil probe reporting moisture, temperature, EC, pH, salinity and TDS over Modbus-RTU on RS-485 at 4800 bps, 8N1, on DC 4.5–30 V. This guide documents 15 registers, default Modbus address 1. It does not report N-P-K. For those on the same bus: N-P-K → SN-3002-TR-ECTHNPKPH-N01. It is register-compatible with the Renke RS-ECTHPH-N01-TR-1 and ZTS-3001-TR-ECTHPH-N01, which the same firmware profile reads unchanged. Sankhya firmware profile: ZTS_4in1_ECTHPH.

Quick reference

Bus & electrical specs

Protocol

Modbus-RTU over RS-485

Default baud

4800 bps

Serial format

8N1

Function codes

0x03, 0x06

Supply voltage

DC 4.5–30 V

Power

≤ 0.5 W (24 V DC)

Default address

Ingress / housing

IP68

Probe / element

Stainless steel

Operating temp.

−40 to +80 °C (probe)

Firmware profile

ZTS_4in1_ECTHPH

Specs sourced from: Official SN-3001-TR-*-N01 datasheet (R224096); ZTS-compatible register layout.

Modbus-RTU register map

Function codes 0x03, 0x06 at 4800 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	Negative values in two's complement.
0002H	40003	Electrical conductivity	uint16	1	uS/cm	RO
0003H	40004	pH	uint16	0.1	pH	RO
0007H	40008	Salinity	uint16	1	mg/L	RO	Reference value only.
0008H	40009	TDS	uint16	1	mg/L	RO	Reference value only.
0022H	40035	Conductivity temperature coefficient	uint16	0.1	%	RW	Default 0 (0.0%).
0023H	40036	Salinity conversion coefficient	uint16	0.01	—	RW	Default 55 (0.55).
0024H	40037	TDS conversion coefficient	uint16	0.01	—	RW	Default 50 (0.50).
0050H	40081	Temperature calibration value	int16	0.1	°C	RW
0051H	40082	Moisture calibration value	int16	0.1	%	RW
0052H	40083	Conductivity calibration value	int16	1	uS/cm	RW
0053H	40084	pH calibration value	int16	0.1	pH	RW
07D0H	42001	Device address	uint16	1	—	RW	Range 1-254. Factory default 1.
07D1H	42002	Baud rate	uint16	1	—	RW	Factory default 1 (4800 bps). 0=2400; 1=4800; 2=9600

Example poll

Worked query

# Read moisture+temp+EC+pH (4 registers from 0x0000) request 01 03 00 00 00 04 44 09 response 01 03 08 02 92 FF 9B 03 E8 00 38 57 B6 # moisture=65.8%, temperature=-10.1°C, EC=1000 uS/cm, pH=5.6

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. Range 1-254. Factory default 1.
Set the baud rate by writing register 07D1H (PLC 42002). Values: 0=2400, 1=4800, 2=9600. Factory default 1 (4800 bps).
Power-cycle the probe after a configuration write for the change to take effect.

Field notes

Notes & caveats

Different manufacturer (Puruisenshe) but IDENTICAL register map to ZTS family. Confirmed from uploaded official datasheet. Share firmware profile ZTS_4in1_ECTHPH.

FAQ

Common questions

What baud rate does the SN-3001-TR-ECTHPH-N01 use by default?: 4800 bps, 8N1. It is a Modbus-RTU slave; default address 1.
What supply voltage does the SN-3001-TR-ECTHPH-N01 need?: DC 4.5–30 V (≤ 0.5 W (24 V DC)).
How do I change the SN-3001-TR-ECTHPH-N01 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 SN-3001-TR-ECTHPH-N01 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 SN-3001-TR-ECTHPH-N01 measure N-P-K?: The SN-3001-TR-ECTHPH-N01 reports moisture, temperature, EC, pH, salinity and TDS only — it does not report N-P-K. On the same RS-485 bus, add N-P-K: SN-3002-TR-ECTHNPKPH-N01.
Is the SN-3001-TR-ECTHPH-N01 the same as the Renke RS-ECTHPH-N01-TR-1?: They are register-compatible, not identical products. Both expose the same parameter set and the same Modbus register map, and Sankhya reads both with the ZTS_4in1_ECTHPH firmware profile. Housing, cable gland and probe material can differ between vendors, so check the electrical specs above before substituting one for the other.

Alternatives

How this differs from similar models

How the SN-3001-TR-ECTHPH-N01 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
Renke RS-ECTHPH-N01-TR-1	Drop-in	Moisture, Temperature, EC, pH, Salinity, TDS	4800	Same parameter set and register map. No documented differences.
ZTS-3001-TR-ECTHPH-N01	Drop-in	Moisture, Temperature, EC, pH, Salinity, TDS	4800	Same parameter set and register map. Differs in supply range (DC 5–30 V).
SN-3002-TR-ECTHNPKPH-N01	Sibling	Moisture, Temperature, EC, pH, N-P-K, Salinity, TDS	4800	Adds N-P-K.

Same family

Related SN 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.