What baud rate does the JXBS-3001-TR (7-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 (7-in-1) need?

DC 5–24 V (≤ 0.15 W (12 V DC)).

How do I change the JXBS-3001-TR (7-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 (7-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.

Does the JXBS-3001-TR (7-in-1) measure salinity and TDS?

The JXBS-3001-TR (7-in-1) reports moisture, temperature, EC, pH and N-P-K only — it does not report salinity and TDS. On the same RS-485 bus, add salinity: DFRobot SEN0601; TDS: DFRobot SEN0601.

How many Modbus registers does the JXBS-3001-TR (7-in-1) expose?

This guide documents 9 registers, read with function code 0x03 and written with 0x06 where the register is RW. Documented entries include pH, Soil moisture, Soil temperature, Electrical conductivity, Nitrogen and Phosphorus.

Home / Sensors / JXBS-3001-TR (7-in-1)

JXCT · RS-485 sensor

Weihai JXCT Electronics

JXBS-3001-TR (7-in-1)

JXCT 7-in-1 with live N-P-K. pH scale 0.01; config at 0x0100/0x0101.

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

At a glance

The JXBS-3001-TR (7-in-1) is a 5-in-1 RS-485 soil probe reporting moisture, temperature, EC, pH and N-P-K over Modbus-RTU on RS-485 at 9600 bps, 8N1, on DC 5–24 V. This guide documents 9 registers, default Modbus address 1. It does not report salinity and TDS. For those on the same bus: salinity → DFRobot SEN0601; TDS → DFRobot SEN0601. Sankhya firmware profile: JXCT_7in1.

Quick reference

Bus & electrical specs

Protocol

Modbus-RTU over RS-485

Default baud

9600 bps

Serial format

8N1

Function codes

0x03

Supply voltage

DC 5–24 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_7in1

Specs sourced from: JXBS-3001 7-in-1 user manual (Ver 2.0).

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. Range 3-9 pH. Accuracy ±0.3 pH.
0012H	40019	Soil moisture	uint16	0.1	%RH	RO	Range 0-100%. Accuracy ±3% (0-53%), ±5% (53-100%).
0013H	40020	Soil temperature	int16	0.1	°C	RO	Range -40 to 80°C. Accuracy ±0.5°C. Negative in two's complement.
0015H	40022	Electrical conductivity	uint16	1	uS/cm	RO	Range 0-10000 uS/cm. Resolution 10 uS/cm.
001EH	40031	Nitrogen	uint16	1	mg/kg	RO	Range 0-1999 mg/kg. Accuracy ±2%FS. LIVE reading unlike ZTS family.
001FH	40032	Phosphorus	uint16	1	mg/kg	RO	Range 0-1999 mg/kg. LIVE reading.
0020H	40033	Potassium	uint16	1	mg/kg	RO	Range 0-1999 mg/kg. LIVE reading.
0100H	40257	Device address	uint16	1	—	RW	Range 0-255. Factory default 1.
0101H	40258	Baud rate	uint16	1	—	RW	Factory default 9600 bps. 2400=2400; 4800=4800; 9600=9600

Example poll

Worked query

# Read moisture + temperature request 01 03 00 12 00 02 64 0E response 01 03 04 02 92 FF 9B 5A 3D # moisture=65.8%, temperature=-10.1°C

# Read EC request 01 03 00 15 00 01 95 CE response 01 03 02 05 DC 8D 8D # EC=1500 uS/cm

# Read NPK (3 registers) request 01 03 00 1E 00 03 65 CD response 01 03 06 00 20 00 25 00 30 B1 6D # N=32 mg/kg, P=37 mg/kg, K=48 mg/kg

# Read pH request 01 03 00 06 00 01 64 0B response 01 03 02 01 34 B8 03 # pH=3.08

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. Range 0-255. Factory default 1.
Set the baud rate by writing register 0101H (PLC 40258). Values: 2400=2400, 4800=4800, 9600=9600. Factory default 9600 bps.
Power-cycle the probe after a configuration write for the change to take effect.

Field notes

Notes & caveats

JXCT 7-in-1. Unlike ZTS family, NPK here are LIVE probe readings. pH scale is 0.01 not 0.1. Config registers at 0x0100/0x0101 not 0x07D0/0x07D1. Default baud 9600 not 4800. Needs separate firmware profile from ZTS.

FAQ

Common questions

What baud rate does the JXBS-3001-TR (7-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 (7-in-1) need?: DC 5–24 V (≤ 0.15 W (12 V DC)).
How do I change the JXBS-3001-TR (7-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 (7-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.
Does the JXBS-3001-TR (7-in-1) measure salinity and TDS?: The JXBS-3001-TR (7-in-1) reports moisture, temperature, EC, pH and N-P-K only — it does not report salinity and TDS. On the same RS-485 bus, add salinity: DFRobot SEN0601; TDS: DFRobot SEN0601.
How many Modbus registers does the JXBS-3001-TR (7-in-1) expose?: This guide documents 9 registers, read with function code 0x03 and written with 0x06 where the register is RW. Documented entries include pH, Soil moisture, Soil temperature, Electrical conductivity, Nitrogen and Phosphorus.

Alternatives

How this differs from similar models

How the JXBS-3001-TR (7-in-1) compares with the other RS-485 models in the Sankhya library. "Drop-in" means the same parameter set and the same register map, read by the same firmware profile.

Model	Relationship	Measures	Baud	Difference
JXBS-3001-TR (4-in-1)	Sibling	Moisture, Temperature, EC, pH	9600	Drops N-P-K.
JXBS-3001-NPK-RS	Sibling	N-P-K	9600	Drops moisture, temperature, EC and pH.
JXBS-3001-PH-RS	Sibling	pH	9600	Drops moisture, temperature, EC and N-P-K.

Same family

Related JXCT 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.