OEM Rangefinder Cable Brief: What to Specify

An OEM rangefinder cable specification should tell a supplier exactly what connects at each end, which signals travel between them, how the assembly is routed, and how it will be inspected. Start with the actual module and host drawings, then put every unresolved electrical or mechanical detail on a written question list. A connector that fits is not proof that the pinout, supply, or signal levels are compatible.

Signals to list

Build a connection schedule with one row per conductor. For each row state the module contact, signal name, direction from the module’s perspective, host contact, wire identification, and any approved electrical limits. Include supply and return paths as well as data signals. Specify whether unused contacts remain unconnected, and ask both sides to approve that decision. Include the drawing revision and the connector view used for numbering: a mating-face view and a wire-entry view can appear reversed.

For LRF50H, the current record lists UART and a 9–36 V DC supply. Its documented wire arrangement has supply positive on red, ground on black and yellow, module TX on green, and module RX on blue. Module TX connects to host RX; module RX connects to host TX. The record does not specify UART logic voltage. Confirm the TX and RX electrical limits for the supplied version before choosing a host interface or level translator; do not use the supply voltage as the signal voltage.

For LRF2000A, the published record lists UART at 3.3 V TTL and a DC 3.3 ± 0.1 V supply. Its pin sequence and connector configuration have not been reviewed for publication. Request the controlled pinout and mating drawing for the supplied version rather than borrowing the other model’s colors or pin positions. The source also contains conflicting baud-rate information, so obtain a written communication setting for that version before testing.

Connector and strain relief

Identify the module-side and host-side connector separately. Give the manufacturer and part number for each housing, contact and seal where applicable, along with the approved mating part. Attach a dimensioned drawing that shows latch orientation, contact numbering, cable exit direction and any clearance needed for assembly or service. A pitch or pin count alone is not a complete connector definition.

The LRF50H record describes a 5-pin 1.25 mm terminal, M1250V-05P, with 50 cm tinned loose wire. Treat this as the documented starting arrangement, not proof that every mating connector or custom harness has been approved. Confirm the mating parts, measurement points and any change from the supplied arrangement with the supplier. For LRF2000A, obtain the connector configuration and mechanical drawing before releasing a cable drawing.

Show where the jacket is supported and where the cable exits the enclosure. State the permitted movement during operation and service, the expected bend path, and the attachment points. Agree on bend-radius and retention requirements for the selected cable and connector rather than inventing a universal limit. Strain relief should carry cable loads into the enclosure or support, not rely on the contacts alone.

Length and shielding

Define finished length between named reference points, with tolerance, rather than asking for a cable that is simply “long.” Include routing allowance for bends, service loops and movement, but distinguish this allowance from a verified electrical limit. State the operating environment, nearby switching equipment, expected flexing and any temperature or cleaning exposure that the assembly must tolerate.

Specify conductor construction and gauge after the electrical and mechanical requirements are known. The supplier should check the supply drop over the complete outgoing and return paths, including relevant contacts, at the application’s operating current. Compare the resulting voltage at the module with the module’s documented supply range. This is a design check, not evidence that a particular length or wire size will work.

If a shield is required, put its coverage, termination and insulation requirements on the drawing. Identify the intended connection point or points and whether the shield must be isolated at the other end. Agree on the grounding scheme with the host designer and supplier; do not assume that connecting both ends is always correct. Route the assembly and test it in the actual installation, because shielding choices and cable placement interact with the surrounding electrical environment.

Acceptance check

Put the pass limits and test method on the order drawing before requesting a quote. The following checks are a practical starting point; the buyer and supplier must agree on actual numerical limits and sample scope.

Keep the approved drawing, inspection record and any change notice together. If the connector, cable construction, route or interface settings change, review which checks must be repeated. A successful continuity check does not establish that the voltage at the module stays within range or that the serial link remains reliable in the final routing.

For a useful inspection record, identify the drawing revision, assembly lot and equipment used for each agreed check. Record measured values where the drawing calls for them, rather than reporting only a general pass. If a test requires a particular host, power source or operating mode, identify that setup so the supplier and buyer can reproduce it. Agree on what happens to an assembly that fails inspection and how a proposed substitution is reviewed. These administrative details do not replace electrical limits or prove installed performance, but they make the agreed checks easier to trace back to the cable supplied.

A brief you can send

• Module model and supplied revision; host connector and drawing revision.
• Both connector part numbers, contact numbering views and complete end-to-end connection schedule.
• Supply limits, current assumptions, signal levels, data direction and approved communication settings.
• Finished length and tolerance, cable construction, routing, movement and environmental requirements.
• Shield construction and termination, strain relief, identification and acceptance checks with agreed limits.

Mark each missing item as a question for the supplier, not an assumed requirement. The 905 nm UART module overview is a starting point for model selection; the version-specific documents and the approved cable drawing govern the assembly. Send the brief and its open questions through the contact page.

FAQ

Category pages: Laser distance sensor · Laser rangefinder module

Models mentioned in this article

• LRF50H905 nm · up to 50 m · UART · 15 ± 2 g
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