What baud rate does the JXBS-3001-NPK-RS use by default?

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

What supply voltage does the JXBS-3001-NPK-RS need?

DC 12–24 V (≤ 0.15 W (12 V DC)).

How do I change the JXBS-3001-NPK-RS 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-NPK-RS 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-NPK-RS

Name: JXBS-3001-NPK-RS
Brand: Weihai JXCT Electronics

JXCT standalone N-P-K probe (3 registers from 0x001E).

✓ Verified for SankhyaN-P-KVerification 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_NPK_only

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
001EH	40031	Nitrogen	uint16	1	mg/kg	RO
001FH	40032	Phosphorus	uint16	1	mg/kg	RO
0020H	40033	Potassium	uint16	1	mg/kg	RO
0100H	40257	Device address	uint16	1	—	RW
0101H	40258	Baud rate	uint16	1	—	RW	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.
Set the baud rate by writing register 0101H (PLC 40258). Values: 2400=2400, 4800=4800, 9600=9600.
Power-cycle the probe after a configuration write for the change to take effect.

Field notes

Notes & caveats

NPK-only variant. Live probe readings confirmed from uploaded manual. Default baud 9600.

FAQ

Common questions

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