FIELD GUIDESource-led reference
Port & Cable

P055 / Video / Guide

Why the direction of an adapter matters

Always write the chain with arrows.

The useful distinction

Start at the device generating the video, then follow each cable and conversion stage to the display input. A converter’s connector names are not enough: inspect its declared input, output and any power connection.

Claim inspection dates: 2026-10-01 · Independent review pending

Guide note · not an individual product specification

Decision field guide 04 Direction matters

Reverse arrows need different equipment

DisplayPort-source → HDMI-display and HDMI-source → DisplayPort-display are different conversions; an adapter cannot be flipped by relabeling it.

Conceptual direction matters decision path; steps and conditions appear in the text equivalent alongside. Illustration not to scale or a compatibility finding.
Original explanatory schematic · not to scale · read the exact source scope. Scroll horizontally on small screens.

Read the decision

  1. Write down which device actually outputs the video signal.
  2. Choose a converter whose stated input and output direction match that path.
  3. Check exact product limits, power requirements and the display input; the reverse chain is not implied.

Still unknown: Neither direction establishes a specific refresh rate or untested converter compatibility.

Read adapter direction requirements

Existing evidence: C043A · C045A · C055A source records S035 · S036. See each source record for its inspection date and scope; graphic interpretation remains pending independent technical and publication review.

The useful distinction

Understand the requirement.

A converter designed for HDMI input and DisplayPort output is a different class from a DisplayPort-to-HDMI converter. [C055A]

Bounded facts, visible unknowns

Specifications and limits

Why the direction of an adapter matters facts and limitations
Minimum evidenceInput, output, direction and power requirements [C055A]
Verified device listNot included. Check exact device and accessory documentation.
A boundary, not an omission to guess around.

This is a scoped requirements guide, not an interoperability certification. It does not test hardware, calculate an arbitrary display timing, or replace the exact product documentation. A missing capability stays unknown.

Before you connect

What to check

  1. Write source → converter → display.
  2. Read exact input and output labels in the manufacturer’s specification.
  3. Treat bidirectionality as an explicit feature requiring evidence.
  4. Check power requirements separately from video direction.
Trace a supported connection class →

Your next step

Move from the form to the requirement.

Compare this field note See the differences without assuming interchangeability.Work through a connection Choose your task before deciding on a cable.Explore this evidence trail Inspect the claims and their dependencies. (private workspace)

The source trail

Evidence for this page

AI-assisted inspection is not independent engineering review. Source scope and access limitations are disclosed below. Procedural checklists are editorial requirements, not hardware measurements.

C055ASource checked · pending review

A converter designed for HDMI input and DisplayPort output is a different class from a DisplayPort-to-HDMI converter.

StarTech.com · HDMI to DisplayPort adapter ↗

Locator: PDF p. 1: USB-A power lead; p. 2: explicit one-way HDMI-source to DisplayPort-display conversion and Hardware table, visually inspected.
Access: public pdf text. Exact 128-HDMI-DISPLAYPORT example only. The attached USB lead is for converter power in the scoped description; no USB data path is inferred. Power and supported modes remain product-specific, without a universal compatibility verdict.

S036: full source recordInspect review dependencies → (private workspace)

Claim scope: Consumer identification / documented standard or product class only. Next review due 2026-12-30.

Suggest a correction to this field note →

Evidence behind this page

Scope first. Source second. Approval separate.

1 linked sources · 1 scoped claims · 0 sources with inspection/access flags.

Page scope: consumer_pilot

Assessment 2026-10-22 · earliest scheduled source review 2027-01-05. This is a recorded-date assessment, not a live source check. Page-level independent review is not established by this panel.

Inspect 1 source scopes, access limits and dates

S036 · HDMI to DisplayPort adapter

StarTech.com · Manufacturer / product-owner domain · inspected 2026-10-07 · due 2027-01-05

Within inspection window

Scoped support: Scoped active HDMI-source to DisplayPort-display example.

Not established / limitations: Exact 128-HDMI-DISPLAYPORT example only. The attached USB lead is for converter power in the scoped description; no USB data path is inferred. Power and supported modes remain product-specific, without a universal compatibility verdict.

Locator: PDF p. 1: USB-A power lead; p. 2: explicit one-way HDMI-source to DisplayPort-display conversion and Hardware table, visually inspected.

Trace 1 claims to their source records

C055A · P055

A converter designed for HDMI input and DisplayPort output is a different class from a DisplayPort-to-HDMI converter.

Claim scope: Consumer identification / documented standard or product class only

Source links: S036 · Evidence trail → (private workspace)

Prepare this page for review → (private workspace)Read the evidence method →

Recorded evidence only. An inspection date, publisher label, source link or generated packet is not independent technical review, hardware testing, fabrication approval or a compatibility verdict.