ACtE08 · Chapter 8Demo · Set 4🏛️ Past Licensure QuestionID: de599ca9
RS-232 is fundamentally categorized as which of the following?
RS-232 is fundamentally categorized as which of the following?
Multiple Choice Options
- A
UART
- B
USART
- C
Both UART and USART
- D✓ Correct Option
None of the above
Detailed Technical Solution & Explanation
RS-232 is an EIA/TIA standard defining the physical layer electrical, functional, and physical characteristics of serial binary data exchange (e.g., voltage levels of for logic 1 and for logic 0, DB-9/DB-25 pinouts, baud rates).
In contrast, UART (Universal Asynchronous Receiver-Transmitter) and USART (Universal Synchronous/Asynchronous Receiver-Transmitter) are silicon microchip integrated circuits that convert parallel data from a CPU bus into serial bit streams. While a UART frequently uses an RS-232 line driver (like MAX232) to transmit over cable, RS-232 itself is neither a UART nor a USART.
Option Analysis:
•
Option A (UART): Incorrect; UART is a hardware controller chip, not a physical electrical signaling standard.
•
Option B (USART): Incorrect; USART is a synchronous/asynchronous hardware controller chip.
•
Option C (Both UART and USART): Incorrect; RS-232 cannot be equated to controller integrated circuits.
•
Option D (None of the above): Correct; RS-232 is a physical-layer serial electrical interface standard, not a UART or USART controller.
Reference: Demo · Set 4NEC Licensure Syllabus