A barcode reader over a moving line is not simply a hands-free substitute for a handheld scanner. The purchase decision is whether each passing carton, tote or part needs an automatic, attributable event—and what happens when that event is missing or ambiguous. Keep a staffed scan-and-release point when an operator can control presentation and resolve exceptions before the item moves on. Consider a fixed-mount reader only when the line geometry, trigger, host association and no-read path can be specified as one working system. This guide defines the questions for a quotation; it does not assert that any AIDC GO model is a fixed industrial reader or meets a stated line speed.
Decide what must happen to each moving object
Start with the business event, not a decoder catalog. Is the system confirming that a known tote passed a point, matching a carton to an order, or deciding whether to divert an unidentified item? Name the object that owns the event and the application record to be updated. A decoded string without the correct object association can be worse than an explicit no-read: it may place a valid identifier on the wrong transaction.
At an operator-controlled bench, the person can stop, orient and rescan an item. The presentation-versus-trigger workstation guide addresses that handling cycle. On a moving conveyor, the item may leave the read zone before a person sees the result. The buyer therefore needs a defined detection point, read window, object association and exception destination. A staffed recovery station may still be part of the fixed-read design; these are not mutually exclusive purchases.
Specify the application envelope before naming a reader
Document the actual code samples, symbologies, smallest module size, print contrast and label position. At the line, measure the range of object heights, lateral positions, angles, package spacing and speeds—not only the nominal distance to one perfect label. Record whether more than one code can be visible in a single image and whether the code may appear on different faces. Cognex’s DataMan fixed-mount reference manual calls these factors an application envelope, including working distance and width, line speed, spacing, module size, and trigger/output requirements. Its guidance describes DataMan configurations; it is a way to frame the evidence request, not a specification for an unnamed reader.
Ask each bidder to state the exact reader, lens, illumination, mounting position, firmware/software version and supported code set proposed for this envelope. Zebra’s FS40 sheet, for example, lists distinct interface and I/O options for that Zebra product. It illustrates why an interface must be quoted by configuration; it does not establish the ports, optical performance or availability of an AIDC GO model. Reflective wrap, curved surfaces and changing height should be tested with the real packages at the intended mounting position. A single successful scan while the belt is stopped is not evidence for the moving application.
Compare the complete capture arrangements
| Buyer question | Staffed scan-and-release point | Automatic fixed-read point |
|---|---|---|
| Who controls presentation? | Operator: A person stops and orients the object, scans it, and releases it only after the application responds. | Line geometry: The belt or fixture presents the code within a measured field of view while the object moves. |
| Who starts the event? | Human action: The trigger or presentation scan follows the operator’s selected object and screen context. | Line control: A specified sensor, reader mode or controller signal starts a defined read window; the exact method depends on the chosen system. |
| How is the result associated? | Application context: The workstation must show which order or tote accepted the scan. | Object tracking: The controller/host must associate good reads and no-reads with the same detected object and downstream action. |
| What happens on no-read? | Immediate recovery: Hold the item for a deliberate rescan or documented exception. | Designed exception: Stop, divert or flag the correct object, with a staffed recovery method; no-read must not silently become a valid event. |
| What belongs in the quote? | Workstation kit: Scanner, host, mount, input method, operator feedback and exception procedure. | Line kit: Reader optics and light, mounting, sensor/encoder where required, power/network/I/O, controller/host integration, guarding and recovery station. |
The table is a choice of operating arrangements, not a claim that a particular device ships with all listed components. For a packing line, the item–carton–shipping-label verification guide explains the business relationship that the read event may need to protect. A reader quote should identify where that relationship is checked and who owns a rejected or unmatched event.
Make the read and no-read paths observable
Require a signal diagram for detection, acquisition, decoded result, timeout/no-read, host acknowledgement and downstream action. Decide whether the line can continue while the host is unavailable; if it can, specify where events queue and how duplicates are prevented when service returns. If the proposed system cannot distinguish two closely spaced objects, a successful decode is not enough to establish correct routing.
Cognex documents a package-detection input and optional buffered no-read images for a DataMan configuration using Continuous trigger mode. That is a version- and mode-specific third-party example, not a universal no-read feature. A bidder should show the equivalent evidence for the exact proposed reader and firmware, or state plainly that the design uses another mechanism. Likewise, a no-read image may help diagnose the optical failure but does not itself prove the downstream object was held or diverted.
Request a quote for the line, not a bare scan engine
Give suppliers a short application packet: sample codes and worst-case packages; measured line envelope; object spacing and intended operating modes; electrical and network drawings; host event format; the consequence of an unidentified item; and the required recovery action. Ask for an itemized bill of materials and responsibility matrix that names installation, lighting, mounting, I/O, controller logic, software integration, maintenance access and spare strategy. Note which parts are existing plant equipment and which are in the offered scope.
If the supplier proposes a fixed industrial reader, require the exact orderable configuration and evidence that its interface and trigger mode support the design. If a manual exception station is proposed, specify the scanner and host together. AIDC GO’s product overview and integration-support page can start a discussion about barcode capture and host workflow. They do not establish that a fixed-mount reader, sensor, PLC, conveyor or complete integration service is stocked or included. Use the contact form to define the required supply and integration scope before requesting a firm quote.
Prove object association with a controlled line trial
Use a hypothetical trial sequence, not a claimed customer result. Send distinguishable test cartons A and B with known labels through the planned line geometry, first spaced comfortably and then at the documented minimum spacing. Add a carton with an unreadable label, one with a visible but unexpected code, and one deliberately turned to a difficult orientation. For each detected object, compare the controller event, decoded value or explicit no-read, host record and physical destination. A and B must never exchange records; the unreadable item must not be counted as a good read.
Repeat after a temporary host or network interruption and document the recovery policy. Observe how an operator reintroduces a rejected item without creating a second accepted transaction. Measure results against the purchaser’s own acceptance criteria across representative packaging—not against an invented read-rate promise. If the line envelope changes materially, such as a new label face or package height, reopen the optical and routing assessment. This guide is a procurement framework; any performance, compatibility, support or supply commitment belongs to the exact quoted configuration and witnessed result.