What baud rate does the SN-3002-TR-ECTHNPKPH-N01 use by default?

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

What supply voltage does the SN-3002-TR-ECTHNPKPH-N01 need?

DC 4.5–30 V (≤ 0.5 W (24 V DC)).

How do I change the SN-3002-TR-ECTHNPKPH-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-3002-TR-ECTHNPKPH-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.

Home / Sensors / SN-3002-TR-ECTHNPKPH-N01

SN · RS-485 sensor

Puruisenshe (普锐森社)

SN-3002-TR-ECTHNPKPH-N01

Name: SN-3002-TR-ECTHNPKPH-N01
Brand: Puruisenshe (普锐森社)

7-register probe with write-in N-P-K (ZTS-3002-class behaviour).

✓ Verified for SankhyaMoistureTemperatureECpHN-P-KSalinityTDSVerification 0.80 · verified

Quick reference

Bus & electrical specs

Note. As with the ZTS-3002, the NPK fields are write-in temporaries, not live readings.

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_7in1

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.

Inherited map. SN-3002-TR-ECTHNPKPH-N01 is register-compatible with the ZTS-3001-TR-ECTHNPKPH-N01 and shares its layout. The table below is that confirmed map. SN-3002 is the 7-parameter variant of SN-3001. Given SN-3001 is confirmed identical to ZTS family, SN-3002 almost certainly maps to ZTS_7in1 profile. Verify NPK caveat applies.

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
0004H	40005	Nitrogen (actual value)	uint16	1	mg/kg	RO	LIVE probe reading per ZTS-3001 official PDF. Range 1-1999 mg/kg. Accuracy ±2%FS. Different from ZTS-3002 where this is a writable temporary value.
0005H	40006	Phosphorus (actual value)	uint16	1	mg/kg	RO	LIVE probe reading per ZTS-3001 official PDF. Different from ZTS-3002.
0006H	40007	Potassium (actual value)	uint16	1	mg/kg	RO	LIVE probe reading per ZTS-3001 official PDF. Different from ZTS-3002.
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	0-100 corresponds to 0.0%-10.0%. Default 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
04E8H	41001	Nitrogen coefficient high word	uint16	—	—	RW	IEEE 754 float high 16 bits.
04E9H	41002	Nitrogen coefficient low word	uint16	—	—	RW	IEEE 754 float low 16 bits.
04EAH	41003	Nitrogen deviation	int16	1	—	RW
04F2H	41011	Phosphorus coefficient high word	uint16	—	—	RW	IEEE 754 float high 16 bits.
04F3H	41012	Phosphorus coefficient low word	uint16	—	—	RW	IEEE 754 float low 16 bits.
04F4H	41013	Phosphorus deviation	int16	1	—	RW
04FCH	41021	Potassium coefficient high word	uint16	—	—	RW	IEEE 754 float high 16 bits.
04FDH	41022	Potassium coefficient low word	uint16	—	—	RW	IEEE 754 float low 16 bits.
04FEH	41023	Potassium deviation	int16	1	—	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

SN-3002 is the 7-parameter variant of SN-3001. Given SN-3001 is confirmed identical to ZTS family, SN-3002 almost certainly maps to ZTS_7in1 profile. Verify NPK caveat applies.

FAQ

Common questions

What baud rate does the SN-3002-TR-ECTHNPKPH-N01 use by default?: 4800 bps, 8N1. It is a Modbus-RTU slave; default address 1.
What supply voltage does the SN-3002-TR-ECTHNPKPH-N01 need?: DC 4.5–30 V (≤ 0.5 W (24 V DC)).
How do I change the SN-3002-TR-ECTHNPKPH-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-3002-TR-ECTHNPKPH-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.

Same family

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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.

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