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rs232/usart

wop donut

So I am using an code and trying to communicate to another device using a usart. i have noticed that i must connect the transmit line of the usart to the transmit line of my rs232 level shifter to get things to display on my computer, why is this?

thank you.

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  • 0 in reply to Andy Neil

    Hi. if you are into microcontrollers, some of them has built in TX/RCV for RS232. no need for level shifters.<?i>

    Only if you connect on logic level (ttl) you can leave out a level shifter IC (bucket device?). But then you should'nt call that RS232, because that implies using + and minus negative voltages.

    So you can definitly not connect a port chip without a levelshifter (max232) to an RS232 device, cause the chip is all ttl only ever and maybe cmos sometime.

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  • 0 in reply to Andy Neil

    Hi. if you are into microcontrollers, some of them has built in TX/RCV for RS232. no need for level shifters.<?i>

    Only if you connect on logic level (ttl) you can leave out a level shifter IC (bucket device?). But then you should'nt call that RS232, because that implies using + and minus negative voltages.

    So you can definitly not connect a port chip without a levelshifter (max232) to an RS232 device, cause the chip is all ttl only ever and maybe cmos sometime.

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