[Klug-general] TTL to RS-232 advice

[Brian Reay]

What are you trying to do?

In particular, does the device you wish to connect to (not the PC, the
other 'end') have RS232 or TTL levels? If it is TTL and just Tx and Rx data
( plus ground) then a USB device like I mentioned should be fine. It will
appear as a serial device under Linux just like any other serial port. All
the ones I've used, Ubuntu has had the drivers  already installed.

Brian


On Sunday, 4 January 2015, jwmartnet . <jwm.art.net at gmail.com> wrote:

> Thanks for your replies, but I'm clueless about electronics (and
> evidence seems to be stacking up against me in related areas too).
>
> The USB things look preferable, and avoid the need to get a serial
> cable (and enable the serial port in pc bios) ... I just don't know
> what the right thing to get would be. The product description in the
> second of those ebay listing you gave, Brian, doesn't fill me with
> confidence!
>
> Thanks.
>
>
>
>
> On 3 January 2015 at 16:53, Brian Reay <brian.reay at gmail.com
> <javascript:;>> wrote:
> > They are bidirectional in that that the inputs RS232 "side" are convert
> to
> > 3.3V TTL and the inputs on the 3.3V TTL side.
> >
> > You mentioned USB, you can buy Serial USB ports of Ebay (and Amazon)
> which
> > have a TTL level output. They are a simple serial interface, ie little if
> > any data control signals.  'Flying lead' ends.
> >
> > I've used ones like both of these:
> >
> >
> http://www.ebay.co.uk/itm/F04879-PL2303HX-USB-Transfer-to-TTL-RS232-Serial-Port-Adapter-Cable-Module-/141130969609?pt=UK_Replacement_Parts_Tools_Repair_Kits&hash=item20dc0fb209
> >
> > OR
> >
> >
> http://www.ebay.co.uk/itm/New-USB-2-0-to-TTL-UART-5pin-Serial-Converter-Module-5pin-cables-CP2102-STC-/400644576263?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item5d48471407
> >
> >
> >
> > Brian
> > www.g8osn.net
> >
> >
> >
> > On 03/01/15 16:35, jwmartnet . wrote:
> >
> > Hi,
> >
> > I want to connect a serial console to my device but need a bit of advice
> > before purchasing components.
> >
> > According to the article linked below, I need a ' 3.3V TTL to RS-232
> level
> > shifter'
> >
> > http://www.cyrius.com/debian/kirkwood/qnap/ts-219/serial/
> >
> > Do these converters work bidirectional? Or does it specifically need to
> be
> > 3.3V TTL to RS-232 and not RS232 to 3.3v TTL?
> >
> > Anything to avoid?
> >
> > Probably wishful thinking, but.. I guess TTL to USB wouldn't work without
> > intervening electronics?
> >
> > Cheers
> > James
> >
> >
> >
> > _______________________________________________
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> > Kent at mailman.lug.org.uk <javascript:;>
> > https://mailman.lug.org.uk/mailman/listinfo/kent
> >
> >
> >
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-- 
*Brian Reay*
www.g8osn.net
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