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

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

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

DC 4.5–30 V (RS-485 variant) (Low).

How do I change the Renke RS-SD-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-SD-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-SD-N01-TR-1

Renke · RS-485 sensor

Shandong Renke Control Technology

Renke RS-SD-N01-TR-1

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

Renke single-parameter TDR soil-moisture probe (×100 scale, baud 9600).

✓ Verified for SankhyaMoistureVerification 0.90 · datasheet-confirmed

Quick reference

Bus & electrical specs

Protocol

Modbus-RTU over RS-485

Default baud

9600 bps

Serial format

8N1

Function codes

0x03

Supply voltage

DC 4.5–30 V (RS-485 variant)

Power

Low

Default address

Ingress / housing

IP68

Probe / element

TDR frequency-domain, stainless

Operating temp.

−40 to +80 °C (probe)

Firmware profile

RENKE_SD_1in1

Specs sourced from: Official Renke RS-SD-N01-TR Type-485 manual. (Analog SKU variant is 3.3–5.5 V; the RS-485 unit is wide-voltage.)

Modbus-RTU register map

Function codes 0x03 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	Notes
0001H	40002	Soil moisture content	uint16	0.01	%	RO	CORRECTION v3: Scale is 0.01 (divide raw value by 100). Range 0-100%. Accuracy ±3% (0-53%), ±5% (53-100%).

Example poll

Worked query

# Read moisture (1 register at 0x0001) request 01 03 00 01 00 01 D5 CA response 01 03 02 0F 2D 7D A9 # 0F2DH=3885 => moisture=38.85%

Field notes

Notes & caveats

CORRECTIONS v3 from official Renke PDF: (1) Default baud 9600 not 4800. (2) Scale factor confirmed 0.01 — raw 3885 = 38.85%. (3) Register confirmed at 0001H. (4) Moisture only. (5) Config (address/baud) changed via hardware SET mode with shield wire — no Modbus write registers documented for this model. Probe 304 SS (not 316L).

FAQ

Common questions

What baud rate does the Renke RS-SD-N01-TR-1 use by default?: 9600 bps, 8N1. It is a Modbus-RTU slave; default address 1.
What supply voltage does the Renke RS-SD-N01-TR-1 need?: DC 4.5–30 V (RS-485 variant) (Low).
How do I change the Renke RS-SD-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-SD-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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