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RS-232 — Recommended Standard 232

Defines a legacy serial communications interface.

Acronym study batch 2 · reviewed 2026-10-20

Why learn RS-232 — Recommended Standard 232?

Defines a legacy serial communications interface.

Where it came from

Electrical levels differ from TTL serial and USB.

• Memory aid (a learning cue, not the expansion): Recommended Serial link: remember 232 for old console equipment.

Build your understanding

Work through these exercises in order. Try the task before opening a reference.

1. Without looking, expand RS-232: Recommended Standard 232.
2. Recall this memory aid: Recommended Serial link: remember 232 for old console equipment.
3. Explain the practical use: Defines a legacy serial communications interface.
4. Explain this distinction: Electrical levels differ from TTL serial and USB.
5. Identify RS-232 in a device specification, architecture diagram, or system inventory.

Documentation and sources

• IEEE 802 LAN/MAN standards (www.ieee802.org)
• IETF Internet standards (www.rfc-editor.org)

Catalog source: technology-maxxing. This page reproduces the existing catalog’s learning material and source links.