Selection Guides
Select fixed industrial barcode readers by code type, module size, read distance, line speed, lighting route, trigger timing and no-read handling.
Direct answer
A fixed industrial barcode reader should be selected from the worst-case code sample, not the best printed label. Confirm code type, module size, surface finish, read distance, movement speed, trigger timing, lighting route and target read rate before locking the reader.
The right fixed reader is the one that repeats on the hardest code at production speed, with the same distance, angle, lighting and trigger timing the line will use.
Printed labels, glossy packages and DPM marks can all fail when motion blur, glare, small modules or no-read routing are ignored during selection.
Provide code images, code type, module size, surface material, read distance, speed, trigger method, target read rate and PLC or database output requirement.
Printed carton labels, glossy package codes, etched metal DPM marks and dot-peen DataMatrix codes behave differently. The selection sample set should include poor contrast, damaged edges, reflection and position variation.
A small module code at long distance needs more pixels, better focus and tighter mounting than a large high-contrast label. Code size, reader distance, lens route and field of view should be reviewed together.
Direct part marks on metal or plastic can disappear when the light angle changes. Coaxial, dome, low-angle bar or integrated reader lighting should be tested against real material finish before model selection.
Production readers need trigger input, PLC output, Ethernet or serial communication, result timing, image saving and no-read handling. These requirements can change the reader class and integration cost.
How to test before buying
Test worst-case labels and DPM samples at target speed, then confirm lighting, trigger, read distance and no-read handling before treating the model as production-ready.
Decision checks
Usually higher contrast and easier to read, but motion blur and label position still matter.
Needs real material samples because mark depth, surface finish and lighting angle control contrast.
Exposure, trigger timing and reader placement must fit the speed window.
Decision table
| Factor | Practical rule | RFQ impact |
|---|---|---|
| Printed label | Usually higher contrast and easier to read, but motion blur and label position still matter. | Send label size, code type, conveyor speed and read zone. |
| DPM mark | Needs real material samples because mark depth, surface finish and lighting angle control contrast. | Send laser, etched or dot-peen samples and worst-case photos. |
| Moving conveyor | Exposure, trigger timing and reader placement must fit the speed window. | Send speed range, trigger method and reject distance. |
| Traceability output | Reader result must match PLC, database or MES handoff requirements. | Confirm Ethernet, serial, I/O, image storage and no-read rules. |
Application proof
Labels and codes move quickly, vary in position and must be verified without slowing the packaging line.
DPM marks often fail because mark depth, surface finish and lighting angle change the apparent code contrast.
Small connector features require stable contrast, low distortion and repeatable part positioning before a pass/fail threshold can be trusted.
Common mistakes
Factory handoff
The factory route review starts by checking whether the image can be made stable with lighting and fixture control. Then the camera, lens, reader or 3D sensor route is sized against speed, resolution, interface and installation constraints.
If you already have a Keyence, Cognex, Basler, OPT, LMI, Hikrobot or barcode-reader reference, include it as a reference model. Deyi Vision uses it to understand the application class; final selection still depends on real samples and production limits.
Guide to RFQ
Use the guide to frame the question, then send the details so engineering can recommend a route.
Request engineering RFQGuide FAQ
Start with code type, module size, read distance, movement speed, surface finish, lighting difficulty, communication output and target read rate.
DPM marks usually have lower contrast and depend heavily on mark depth, material finish, light angle, mounting distance and surface reflection.
Send real code images, code type, code size, material, distance, speed, trigger method, mounting limits, required read rate and output protocol.
