JNS-Q Contact Displacement Grating Sensor

Name: JNS-Q Contact Displacement Grating Sensor
Brand: DAIDISIKE
SKU: jns-q-contact-displacement-grating-sensor
Availability: InStock

Digital, RS-485-networkable contact displacement sensor with resolution down to 0.2 micron for inline dimensional inspection.

JNS-Q Contact Displacement Grating Sensor - product photo

🔍 Click to enlarge · 1/6

Technical Specifications

Output	5V type: RS485 (single channel); 24V type: RS232/RS485 (up to 255 units multi-drop); Modbus RTU 38400bps; I/O alarm signal (O1/O2)
Measuring range	12.7mm (JNS-Q120 series); 25.4mm (JNS-Q250 series)
Measuring accuracy (resolution)	0.2μm (high-precision) to 5μm (basic type)
Repeatability	approx. 1μm
Operating voltage	5V type: DC5V (<50mA); 24V type: DC24V
Protection rating	IP65
Pneumatic air source	Φ4 tubing, 0.16-0.2MPa (JNS-Q120Q / JNS-Q120Q24 only)
Communication baud rate	38400bps (Modbus RTU)
Multi-drop capacity	24V type: up to 255 units

Overview

JNS-Q is a contact-type digital displacement sensor whose measuring core is an optical grating (photoelectric linear encoder) with moire-fringe interpolation, rather than a conventional potentiometer or LVDT coil. A spindle with a contact stylus touches the workpiece and the grating reads the linear displacement digitally, with an output resolution ranging from 0.2 μm (high-precision variants) to 5 μm (basic variants) and approximately 1 μm repeatability.

It is intended for manufacturing and quality-control engineers who need micron-level, drift-free contact measurement for tasks such as CNC in-process gauging, multi-point flatness/thickness fixtures, and automated inline sorting, in applications where the workpiece can be physically contacted. The series is available in spring-return, air-push, and self-contained digital-display spindle types, with 5V single-channel RS485 or 24V RS232/RS485 multi-drop networking up to 255 units on one bus.

Key Facts — JNS-Q at a glance

The JNS-Q contact displacement sensor uses an optical grating measuring principle with moire-fringe interpolation, achieving resolution from 0.2 μm (high-precision) to 5 μm (basic), with approximately 1 μm repeatability.
The JNS-Q is available in two standard measuring ranges: 12.7 mm (JNS-Q120 series) and 25.4 mm (JNS-Q250 series).
24V-type JNS-Q sensors support RS232/RS485 with native Modbus RTU at 38,400 bps and can be multi-dropped up to 255 units on a single bus.
The JNS-Q provides two built-in I/O limit-alarm outputs (O1/O2) for hardware-level GO/NG tolerance judgment without host communication.
The JNS-Q air-push (pneumatic) spindle variant is driven by Φ4 tubing at 0.16-0.2 MPa, extending the spindle only when the workpiece is in position.
The JNS-Q housing is rated IP65, suitable for mounting in environments with coolant splash and dust.

Features & Benefits

Sub-micron resolution via optical grating principle

Measures via moire-fringe interpolation on an optical grating, achieving 0.2 μm resolution on high-precision variants down to 5 μm on basic variants, with approximately 1 μm repeatability - enough to make direct pass/fail dimensional judgments on the line instead of sending parts to a CMM room.

Three spindle actuation types on one platform

Spring-return (standard, for continuous contact on fixed fixtures), air-push (Phi4 tubing, 0.16-0.2 MPa, spindle extends only when the part is in place, avoiding stylus drag on automated lines), and self-contained digital-display (on-body screen and keys, direct micron readout for manual inspection benches).

RS-485 multi-drop networking up to 255 units on a single bus

24V-type units support RS232/RS485 with native Modbus RTU (38,400 bps), allowing up to 255 gauges to be wired on one bus and read directly by any PLC or SCADA without proprietary interface hardware - cutting per-point wiring and hub costs on multi-point fixtures.

Built-in I/O limit-alarm outputs (O1/O2) for hardware GO/NG sorting

Two dedicated I/O alarm outputs allow tolerance limits to be set on the sensor itself and trigger reject/sorting mechanisms via a switch signal - no host communication or PLC programming needed for simple pass/fail applications.

Built-in peak-hold and peak-to-peak measurement modes

Real-time value, peak hold (MAX), bottom hold (MIN), and peak-to-peak (MAX-MIN) modes are available directly on the sensor, enabling runout, flatness, and stroke measurement results without host-side data post-processing.

IP65-rated housing for direct shop-floor mounting

With IP65 protection, the sensor can be mounted directly at machining stations exposed to coolant splash and dust, without an additional protective enclosure.

Two standard ranges matching common indicator strokes

12.7 mm (JNS-Q120 series) and 25.4 mm (JNS-Q250 series) correspond to the 0.5-inch/1.0-inch strokes commonly used on dial indicators, easing replacement of analog indicators and imported digital gauge probes in existing fixtures.

Applications

In-process CNC dimensional inspection — The micron-level resolution and contact measurement method suit tool positioning and inline sampling or full inspection of workpiece dimensions at machining stations.

Multi-point flatness/parallelism/thickness fixtures — The RS485 multi-drop capability of up to 255 units allows multiple styli to be positioned simultaneously and share a single bus for combined flatness, parallelism, and multi-section thickness measurement.

Shaft radial runout inspection — Built-in MAX/MIN and MAX-MIN peak-to-peak measurement modes let the sensor read the peak-to-peak value directly after one rotation of the workpiece.

Inline plate/sheet thickness monitoring — Contact measurement with real-time value output supports inline thickness monitoring of plate or sheet material.

Automated assembly-line GO/NG sorting — The O1/O2 limit-alarm outputs can directly drive reject/sorting mechanisms without host-computer programming.

Material testing - micro deformation monitoring — Sub-micron resolution is suited to capturing small displacement changes during material testing such as tension/compression trials.

Manual inspection benches with direct readout — The self-contained digital-display (S) type has an on-body screen and keys, giving direct micron readout without an external readout unit or host computer.

Automated stations with anti-wear stylus contact — The air-push spindle extends only when the workpiece is in place, reducing stylus wear on automated lines.

Models & Ordering Information

5V type

JNS-Q120AJNS-Q250AJNS-Q120SJNS-Q120Q

Single-channel RS485 output. JNS-Q120A/JNS-Q120S/JNS-Q120Q: 12.7mm range; JNS-Q250A: 25.4mm range.

24V type

JNS-Q120A24JNS-Q250A24JNS-Q120S24JNS-Q120Q24

RS232/RS485 output, multi-drop networking up to 255 units, native Modbus RTU (38,400 bps).

How to Select

Need 12.7mm (0.5-inch) stroke: choose the JNS-Q120 series.
Need 25.4mm (1.0-inch) stroke: choose the JNS-Q250 series.
Fixed fixture, continuous contact measurement: choose the spring-return type (A suffix), which relies on an internal spring for return.
Automated production line where stylus wear must be avoided: choose the air-push type (Q suffix), driven by Phi4 tubing, spindle extends only after the part is in place.
Manual inspection bench needing direct readout without an external readout unit: choose the digital-display type (S suffix), with an on-body screen and keys.
Single-point application, cost-sensitive, single-channel RS485 only: choose the 5V type (JNS-Q120A / JNS-Q250A / JNS-Q120S / JNS-Q120Q).
Multi-point system integration needing RS232/RS485 selectability or networking up to 255 units: choose the 24V type (model suffix with 24, e.g. JNS-Q120A24).
Need simple hardware GO/NG judgment without wiring a communication bus: any model can use the I/O alarm output (O1/O2) function - set tolerances and get a direct switch-signal output.
For the air-push type (Q suffix), confirm the workshop can provide a Phi4 tubing connection and a 0.16-0.2MPa air source.

📘 Need the full method? NPN vs PNP Sensor Outputs Explained

When NOT to specify the JNS-Q — and what to use instead

The target must not be physically touched -- delicate, soft, coated, or fast-moving surfaces

Why not: The FAQ confirms JNS-Q is a contact-type sensor: a spindle with a contact stylus physically touches the workpiece, distinguishing it explicitly from non-contact sensors.

Use instead: A non-contact laser displacement sensor from this manufacturer's separate laser displacement sensor product line, as the FAQ itself references.

The required measuring stroke exceeds 25.4 mm

Why not: The two standard ranges documented are 12.7 mm (JNS-Q120 series) and 25.4 mm (JNS-Q250 series) -- no longer-stroke model is listed.

Use instead: Confirm with DAIDISIKE whether a longer-stroke variant exists, or consider a non-contact laser/optical displacement sensor with a longer range.

An automated line where repeated stylus contact would cause unacceptable wear, and the spring-return type is being specified by default

Why not: The air-push (Q suffix) spindle type's own selling point states it extends the spindle only when the part is in position, 'reducing stylus wear on automated lines' -- implying the spring-return (A suffix) type's continuous contact wears the stylus faster in that use case.

Use instead: The air-push (Q suffix) spindle type, after confirming the Φ4 tubing and 0.16-0.2 MPa air source are available on site.

A multi-point system needs RS232/RS485-selectable networking beyond a single channel, but the 5V-type model is being priced

Why not: 5V-type units are documented with single-channel RS485 only; multi-drop networking up to 255 units is documented only for the 24V type.

Use instead: The 24V-type model (suffix 24, e.g., JNS-Q120A24) for RS232/RS485-selectable multi-drop networking.

Specifications we do not publish yet

We only publish a figure once we are confident it is true. The items below are still being validated through further testing and real-world customer feedback, so for now we would rather leave them open than guess. If one of them matters to your design, ask us for the latest validated status.

Response time is not documented
Operating temperature range is not documented
Overall dimensions are not documented
Housing/stylus material is not documented
Certification documents beyond "available on request" are not specified
Contact/measuring force of the stylus is not documented
Stylus tip wear life or recommended service interval is not documented
The meaning of the JNS-Q120Q24 model suffix is unresolved -- source pages show a conflict between a "spring-return" description and the pneumatic "Q" suffix for this specific model

Frequently Asked Questions

What measuring principle does the JNS-Q sensor use?

The JNS-Q uses an optical grating (photoelectric linear encoder) measuring principle with moire-fringe interpolation, rather than a potentiometer or LVDT coil. This gives a digital output without the analog drift associated with inductive probes.

What is the resolution and repeatability of the JNS-Q?

Resolution ranges from 0.2 μm on high-precision variants to 5 μm on basic variants, with repeatability of approximately 1 μm.

What measuring ranges are available?

Two standard ranges: 12.7 mm (JNS-Q120 series) and 25.4 mm (JNS-Q250 series).

Can multiple JNS-Q sensors be networked together?

Yes. The 24V type supports RS232/RS485 with native Modbus RTU (38,400 bps), allowing up to 255 sensors to be multi-dropped on a single RS-485 bus.

Does the JNS-Q support GO/NG sorting without a PLC or host computer?

Yes. It has two built-in I/O limit-alarm outputs (O1/O2) that can be configured with tolerance limits and directly drive a reject/sorting mechanism as a switch signal, without requiring communication programming.

What measurement modes are built into the sensor?

Real-time value, peak hold (MAX), bottom hold (MIN), and peak-to-peak (MAX-MIN) modes are available on the sensor itself, useful for runout, flatness, and stroke measurement.

What is the difference between the spring-return, air-push, and digital-display versions?

Spring-return (A suffix) uses an internal spring for continuous contact, suited to fixed fixtures. Air-push (Q suffix) uses Phi4 pneumatic tubing at 0.16-0.2 MPa to extend the spindle only when the part is in place, reducing stylus wear on automated lines. Digital-display (S suffix) has an on-body screen and keys for direct micron readout without an external readout unit.

What environmental protection rating does the JNS-Q have?

IP65, suitable for mounting directly at machining stations exposed to coolant splash and dust.

Is the JNS-Q a contact or non-contact sensor?

It is a contact-type sensor - a spindle with a contact stylus physically touches the workpiece. For non-contact, longer-range, lower-precision measurement, this manufacturer's laser displacement sensors are a separate product line.

What supply voltage does the JNS-Q require?

5V-type units run on DC5V (<50mA) with single-channel RS485 output; 24V-type units run on DC24V with RS232/RS485 output and multi-drop networking capability.

Is the JNS-Q certified to any specific standards?

Certification documents are available on request.

Works Well Together

On the same machine or line, JNS-Q is typically ordered together with: Laser Displacement Sensors · Proximity Sensors