1. Read
Can the configured vision system locate and decode the symbol within the available cycle time?
Decoded contentDPM code inspection
DataMatrix verification for confident component traceability
Read, validate and grade laser or dot-peen direct part marks immediately after the marking cycle — before the component moves downstream.
A readable code is not automatically a good code
Inspect the symbol under controlled production conditions
A direct-marked DataMatrix can be affected by machining texture, reflectivity, curvature, coating variation, inconsistent dot geometry and the relationship between the camera and the surface. A handheld scanner reading one sample does not prove that the whole marking process is stable.
Oxford Traceability designs the marking and vision process together. Trials establish the correct cell size, quiet zone, mark position, lighting geometry, lens, exposure and acceptance thresholds for the real component.
- Code presence and location
- Decode and expected-data comparison
- Direct part mark quality grading
- Duplicate, missing and mismatch control
- Automatic pass, rework or reject output
Three levels of control
Read, validate and verify
The inspection scope should be stated clearly. Each level answers a different production question.
2. Validate
Does the decoded content exactly match the serial and part record issued for this production cycle?
Right data, right part3. Verify
Does the symbol meet the agreed quality grade under the defined direct-part-mark test method?
Measured qualityVision engineering
The marked surface determines the optical design
A robust image makes the code modules distinct from the substrate across normal production variation.
Illumination
Diffuse, bright-field, dark-field, dome or multi-directional lighting is selected to control glare and reveal the mark.
Optics
Field of view, pixel resolution, working distance, lens protection and focus tolerance are set around the part.
Presentation
Fixtures, triggers and part position keep the code within the validated reading and grading window.
Decision
Acceptance thresholds and error handling are agreed, including re-read, rework, reject and line-stop logic.
Closed-loop verification
Link the inspection result to the exact marking cycle
The strongest architecture keeps data and part identity together throughout the cycle. The controller requests or receives the intended code, triggers the marker, acquires the inspection, compares the decoded result and only releases the part after a valid pass.
A retained record can contain the issued data, decoded data, quality result, recipe, timestamp and other agreed process values.
Explore component traceabilityPLC integration
Cycle triggers, recipes, pass/fail, alarms, rework and reject control.
Data integration
Serial issue, duplicate prevention, result records and production history.
Defined quality, not guesswork
Mark quality engineered around the application
Successful direct part mark verification depends on more than producing a visible symbol. We match the marking process, surface preparation, illumination, optics and verification method to the part and the standard your customer requires.
Where specified, systems can be configured to evaluate direct marks using the current ISO/IEC 29158 methodology and to handle GS1 DataMatrix or customer-specific data structures.
- ISO/IEC 29158:2025Direct part mark symbol quality methodology
- ISO/IEC 16022:2024Data Matrix symbology specification
- GS1 DataMatrixApplication identifiers and structured data
- Customer standardsAutomotive, aerospace and engineering specifications
Questions answered
DataMatrix verification FAQs
Practical answers to common questions from production and engineering teams.
A reader confirms that a symbol can be decoded under its configured conditions. Verification evaluates defined quality characteristics using controlled geometry and illumination. Data validation is a separate check that the decoded content matches the expected production record.
ISO/IEC 29158:2025 is the current international specification for direct part mark symbol quality testing. The end user may also impose sector, customer, application or lighting requirements that need to be included.
Not necessarily. Laser contrast, dot-peen indentations, surface finish and curvature interact differently with illumination. Dome, diffuse, dark-field, bright-field or multi-directional arrangements may be assessed during trials.
Yes, where the cell and cycle are designed for 100% inspection. The vision result can control part release, rework, quarantine or line stop and can be recorded against the component serial.
Yes. Depending on the project, decoded data, grade, inspection values, timestamps and selected images can be retained locally or passed to a PLC, MES or traceability database.
Talk to an applications engineer
Prove your DataMatrix reading window
Send marked samples, component drawings and the required code standard. We can assess lighting, optics, decoding and verification requirements.
Verify the direct part mark after its final surface process
A Data Matrix code that passes directly after marking may look different after blasting, washing, coating or another finishing operation. Identify the last process that can alter the marked surface and the stages where the code must still be read. This establishes whether immediate verification is sufficient for your production objective or whether later checks are also required.
Provide marked samples before and after the relevant treatment, with the process and part revision identified. Compare the visible symbol, required data and reading conditions at the downstream station. Direct part mark grading depends on the applicable method and controlled illumination, so retain those conditions with the result rather than comparing unexplained grade numbers from different setups.
Agree which evidence releases the part and what happens when an otherwise acceptable component loses readable identity during finishing. This can influence mark location, process order or the use of another traceability link through the intermediate operation. The project should state those decisions before the marking cell is specified. Send the full manufacturing route with your sample codes, especially if customers will scan the part after a different surface treatment from the one used in the original trial.
Should a direct part mark be checked after coating?
Assess it where coating can change the required readability or quality result, using representative finished parts and defined reading conditions.
Can DPM grades from different lighting setups be compared directly?
Do not assume so. Retain the applicable method and illumination conditions with each result before drawing a comparison.
Plan identity through the manufacturing route Specify the DPM verification method