What baud rate does the Renke RS-ECTHPH-N01-TR-1 use by default?

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

What supply voltage does the Renke RS-ECTHPH-N01-TR-1 need?

DC 4.5–30 V (≤ 0.5 W (24 V DC)).

How do I change the Renke RS-ECTHPH-N01-TR-1 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 Renke RS-ECTHPH-N01-TR-1 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 / Renke RS-ECTHPH-N01-TR-1

Renke · RS-485 sensor

Shandong Renke Control Technology

Renke RS-ECTHPH-N01-TR-1

Name: Renke RS-ECTHPH-N01-TR-1
Brand: Shandong Renke Control Technology

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

✓ Verified for SankhyaMoistureTemperatureECpHSalinityTDSVerification 0.95 · datasheet-confirmed

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

Corrosion-resistant electrode (stainless)

Operating temp.

−20 to +60 °C

Dimensions

45 × 15 × 127 mm

Cable

2 m (default, customisable)

Response time

≤ 1 s

Stabilisation

≤ 5 min

Firmware profile

ZTS_4in1_ECTHPH

Specs sourced from: Official Renke RS-ECTHPH-N01-TR-1 product page & manual.

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
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	pH	uint16	0.1	pH	RO
0004H	40005	Salinity	uint16	1	mg/L	RO
0005H	40006	TDS	uint16	1	mg/L	RO
0022H	40035	EC temperature coefficient	uint16	0.1	%/°C	RW
0023H	40036	Salinity coefficient	uint16	0.01	—	RW
0024H	40037	TDS factor	uint16	0.01	—	RW
0050H	40081	Temperature calibration	int16	0.1	°C	RW
0051H	40082	Moisture calibration	int16	0.1	%	RW
0052H	40083	EC calibration	int16	1	uS/cm	RW
0053H	40084	pH calibration	int16	1	—	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.

Measurement

Ranges & accuracy

Parameter	Range	Accuracy
Soil moisture	0–100 %RH	±2 % (0–50 %RH), ±3 % (50–100 %RH)
Soil temperature	−40 to +80 °C	±0.5 °C @ 25 °C
EC	0–20000 µS/cm	±3 %FS (0–10000), ±5 %FS (10000–20000)
pH	3–9 pH	±0.3 pH

Field notes

Notes & caveats

Upgraded to 0.95 — official Renke RS-ECTHPH-N01-TR-1 manual V1.2 (renkeer.com) uploaded and verified. Register map confirmed: 0000H=moisture×0.1%, 0001H=temp×0.1°C, 0002H=EC(us/cm), 0003H=pH×0.1, 0004H=salinity, 0005H=TDS. Communication example in manual: query 01 03 00 00 00 04 44 09, response 01 03 08 [moisture][temp][EC][pH] CRC. Added salinity, TDS, coefficient (0022H-0024H) and calibration (0050H-0053H) registers from official manual. Register layout fully confirmed identical to ZTS_4in1_ECTHPH family. Default baud 4800 confirmed.

FAQ

Common questions

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