[Klug-general] TTL to RS-232 advice

[Brian Reay]

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
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