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TTL to RS-232 — Parallax Forums

TTL to RS-232

ettoetto Posts: 10
edited 2007-03-21 15:45 in BASIC Stamp
Hello,

in my microcontroller i have serial connection port(RS-232) with 3 wire and 5 wire...

but printer inkjetki has TTL connection. So how could i convert TTL to RS-232?

thanx

Comments

  • allanlane5allanlane5 Posts: 3,815
    edited 2007-03-21 14:59
    The problem is that the "RS232" specification has some ambiguity about it.

    I'd be surprised if your Inkjet printer used TTL signalling. Perhaps it uses TTL Parallel. Perhaps it uses RS-232 +- 10 volt signalling. And probably your Microcontroller does RS-232 signalling at TTL levels.

    A MAX-232 chip does TTL on one side, +-10 volts on the other side. So that's the simple answer to your question. But as I say, you really need to nail down how many pins, and what voltage levels, each side uses.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-03-21 15:45
    If you're referring to our Serial Inkjet Printer module then it has a single bi-directional I/O line, so it would work much like the interface for our GPS to RS-232 which I have attached for you. Which Microcontroller are you using?

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    Chris Savage
    Parallax Tech Support
    bmp
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    PC to GPS.bmp
    239K
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