What baud rate does the JXBS-3001-TR (4-in-1) use by default?

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

What supply voltage does the JXBS-3001-TR (4-in-1) need?

DC 12–24 V (≤ 0.15 W (12 V DC)).

How do I change the JXBS-3001-TR (4-in-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 JXBS-3001-TR (4-in-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.

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JXCT · RS-485 sensor

Weihai JXCT Electronics

JXBS-3001-TR (4-in-1)

Name: JXBS-3001-TR (4-in-1)
Brand: Weihai JXCT Electronics

JXCT 4-in-1 — moisture, temp, EC, pH. Distinct register family (baud 9600).

✓ Verified for SankhyaMoistureTemperatureECpHVerification 0.95 · 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 12–24 V

Power

≤ 0.15 W (12 V DC)

Default address

Ingress / housing

IP68

Probe / element

316L stainless steel

Operating temp.

−40 to +80 °C (probe)

Firmware profile

JXCT_4in1

Specs sourced from: Official JXBS-3001-TR datasheet (R208894) and JXCT manuals.

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
0006H	40007	pH	uint16	0.01	pH	RO	Scale factor 0.01 — different from ZTS family which uses 0.1.
0012H	40019	Soil moisture	uint16	0.1	%RH	RO
0013H	40020	Soil temperature	int16	0.1	°C	RO	Negative in two's complement.
0015H	40022	Electrical conductivity	uint16	1	uS/cm	RO
0100H	40257	Device address	uint16	1	—	RW	DIFFERENT from ZTS family — address register is at 0x0100, not 0x07D0.
0101H	40258	Baud rate	uint16	1	—	RW	DIFFERENT from ZTS family — baud register at 0x0101, not 0x07D1. Factory default 9600. 2400=2400; 4800=4800; 9600=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 0100H (PLC 40257) with function code 0x06. DIFFERENT from ZTS family — address register is at 0x0100, not 0x07D0.
Set the baud rate by writing register 0101H (PLC 40258). Values: 2400=2400, 4800=4800, 9600=9600. DIFFERENT from ZTS family — baud register at 0x0101, not 0x07D1. Factory default 9600.
Power-cycle the probe after a configuration write for the change to take effect.

Field notes

Notes & caveats

Upgraded to 0.95 — official JXBS-3001-TR Ver1.1 manual uploaded (R208894, Weihai JXCT Electronics). The 4:1 variant is a subset of the 7:1: same register addresses confirmed — 0006H=pH(×0.01), 0012H=moisture(×0.1%RH), 0013H=temperature(×0.1°C), 0015H=EC(1us/cm), config at 0100H/0101H. NPK registers (001EH-0020H) simply absent on 4:1 hardware. Default baud 9600 confirmed. Power 12-24V DC confirmed. JXCT register layout remains fundamentally different from ZTS/SN family — pH scale 0.01 vs ZTS 0.1, moisture at 0012H not 0000H, config at 0100H not 07D0H.

FAQ

Common questions

What baud rate does the JXBS-3001-TR (4-in-1) use by default?: 9600 bps, 8N1. It is a Modbus-RTU slave; default address 1.
What supply voltage does the JXBS-3001-TR (4-in-1) need?: DC 12–24 V (≤ 0.15 W (12 V DC)).
How do I change the JXBS-3001-TR (4-in-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 JXBS-3001-TR (4-in-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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