Aug 08, 2024 Legg igjen en beskjed

Are TTL and RS-232 the same?

TTL and RS-232 are not the same, they have significant differences, mainly in voltage levels and application fields.

TTL (Transistor-Transistor Logic)

High level (logic 1): usually 3.3V or 5V.
Low level (logic {{0}}): usually 0V.

Short-range communication, usually within a circuit board or between devices over short distances.

RS-232

High level (logic 0): usually between +3V and +15V.
Low level (logic 1): usually between -3V and -15V.

Suitable for long-distance communication and can support distances of tens of meters or even longer.

The high and low levels of TTL are 3.3V/5V and 0V respectively.
The high and low levels of RS-232 are positive voltage and negative voltage (+3V to +15V and -3V to -15V) respectively.

TTL is used for low-voltage, short-distance communication between electronic devices.
RS-232 is used for higher voltage, long-distance communication between devices, especially the connection between computers and peripherals.

TTL signals are relatively susceptible to interference and are suitable for short-distance communications.
RS-232 signal voltage is higher, anti-interference ability is strong, and it is suitable for long-distance communication.

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