What baud rate does the ZTS-3002-TR-THNPKPH-N01 use by default?

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

What supply voltage does the ZTS-3002-TR-THNPKPH-N01 need?

DC 4.5–30 V (≤ 0.5 W (24 V DC)).

How do I change the ZTS-3002-TR-THNPKPH-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 ZTS-3002-TR-THNPKPH-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 / ZTS-3002-TR-THNPKPH-N01

ZTS · RS-485 sensor

Zhaotaisheng

ZTS-3002-TR-THNPKPH-N01

Name: ZTS-3002-TR-THNPKPH-N01
Brand: Zhaotaisheng

Moisture, temp, pH + write-in N-P-K (no live nutrient probe).

✓ Verified for SankhyaMoistureTemperaturepHN-P-KVerification 0.95 · datasheet-confirmed

Quick reference

Bus & electrical specs

Note. ZTS-3002 NPK registers (0x0004–0x0006) are read-WRITE temporaries populated from an external instrument — they are NOT a live soil measurement. Suppress them as agronomic data.

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_5in1_noEC

Specs sourced from: Official ZTS-3002-TR-N01 datasheet (R224073/R224074).

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
0003H	40004	pH	uint16	0.1	pH	RO
0004H	40005	Nitrogen (temporary value)	uint16	1	mg/kg	RW	NOT a live probe reading.
0005H	40006	Phosphorus (temporary value)	uint16	1	mg/kg	RW	NOT a live probe reading.
0006H	40007	Potassium (temporary value)	uint16	1	mg/kg	RW	NOT a live probe reading.
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

Same as ECTHNPKPH variant but without EC register at 0002H. No 0002H register present in this variant.

NPK behaviour. CRITICAL: NPK registers are read/write temporary values — NOT live probe readings.

FAQ

Common questions

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

Related ZTS 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.

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