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

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

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

DC 12–24 V (≤ 0.15 W (12 V DC)).

How do I change the JXBS-3001-PH-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-PH-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.

Home / Sensors / JXBS-3001-PH-RS

JXCT · RS-485 sensor

Weihai JXCT Electronics

JXBS-3001-PH-RS

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

JXCT standalone soil pH probe (pH scale 0.01).

✓ Verified for SankhyapHVerification 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_pH_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
0006H	40007	Low-precision pH	uint16	0.01	pH	RO	Scale 0.01. Range 3-9 pH. Accuracy ±0.3 pH. Response time ≤15s.
000DH	40014	High-precision pH	uint16	0.01	pH	RO	Scale 0.01. Higher precision variant of pH reading. Use this register for primary measurement.
0100H	40257	Device address	uint16	1	—	RW	Range 0-252. 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 high-precision pH at 000DH request 01 03 00 0D 00 01 15 C9 response 01 03 02 00 47 D8 15 # 0047H=71 => pH=7.1

# Read low-precision pH at 0006H request 01 03 00 06 00 01 64 0B response 01 03 02 01 34 D8 15 # 0134H=308 => 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 0-252. 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

Confirmed from official JXCT PDF (v2.0, 2020-10-24). Default baud 9600 (not 4800). Power 12-24V (not 5-24V). Long-term stability ≤5%/year. Two pH registers — use 000DH (high precision) as primary. JXCT config register layout (0100H/0101H) confirmed.

FAQ

Common questions

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