Single Line UART to RS232?

Discussion in 'General Electronics Chat' started by Management, May 17, 2012.

  1. Management

    Thread Starter Active Member

    Sep 18, 2007
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    0
    Off the top of my head I think this is no problem but I am just asking to verify.

    Is it possible for me to take a single line UART TTL level signal that is half duplex and use a RS232 converter IC or something like a this http://www.sparkfun.com/products/133# so that I can send and receive data on that line from my PC?

    The only wires on the UART side is 5VDC, Data, & GND. I want that data over the RS232 line with a DB9 plug. Will it work in both directions?

    Thanks!
     
    Last edited: May 17, 2012
  2. crutschow

    Expert

    Mar 14, 2008
    12,991
    3,227
    The RS232 protocol has a separate receive and transmit line (look at schematic of the device you referenced). Do you have only one TTL signal line? Is it bidirectional? :confused:
     
  3. Management

    Thread Starter Active Member

    Sep 18, 2007
    306
    0
    My apologies. For the UART there are separate TXD & RXD lines and then there is PNP on the TXD line and a NPN on the RXD line. They combine it on a single bus.

    Would I eliminate this circuitry and just tie those UART TXD & RXD to a RS232 chip like a MAX3232?
     
  4. crutschow

    Expert

    Mar 14, 2008
    12,991
    3,227
    That sounds correct to me. You need separate TXC and RXC lines for RS-232.
     
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