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TTL and RS232

Usman Rashid

Hi,

I want to know that what is the different between RS232 and TTL.

I want to know that can we two RS232 to TTL converters back to back in the wire ??

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    Hi,

    With the RS-232 standard a logic high ('1') is represented by a negative voltage (from -3V to -25V), while a logic low ('0') is a positive voltage (from 3V to 25V). With TTL (transistor-transistor logic), a logic low is 0V, and a logic high is usually the supply voltage (typical 3.0V on the nRF51). If you want use RS232 with the nRF5x, you need to add a RS232 transmitter/receiver, e.g. MAX232.

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    Hi,

    With the RS-232 standard a logic high ('1') is represented by a negative voltage (from -3V to -25V), while a logic low ('0') is a positive voltage (from 3V to 25V). With TTL (transistor-transistor logic), a logic low is 0V, and a logic high is usually the supply voltage (typical 3.0V on the nRF51). If you want use RS232 with the nRF5x, you need to add a RS232 transmitter/receiver, e.g. MAX232.

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