[Klug-general] TTL to RS-232 advice

[jwmartnet .]

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> 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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