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<div class="moz-cite-prefix">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. <br>
<br>
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. <br>
<br>
I've used ones like both of these:<br>
<br>
<a class="moz-txt-link-freetext" href="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">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</a><br>
<br>
OR<br>
<br>
<a class="moz-txt-link-freetext" href="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">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</a><br>
<br>
<br>
<br>
Brian<br>
<a class="moz-txt-link-abbreviated" href="http://www.g8osn.net">www.g8osn.net</a><br>
<br>
<br>
<br>
On 03/01/15 16:35, jwmartnet . wrote:<br>
</div>
<blockquote
cite="mid:CAPLoHypuKWOfrSPQH=JXCCx2YFV3jaJYpzJ_1yj3tq=eGbbRHQ@mail.gmail.com"
type="cite">
<p dir="ltr">Hi,</p>
<p dir="ltr">I want to connect a serial console to my device but
need a bit of advice before purchasing components.</p>
<p dir="ltr">According to the article linked below, I need a '
3.3V TTL to RS-232 level shifter'</p>
<p dir="ltr"><a moz-do-not-send="true"
href="http://www.cyrius.com/debian/kirkwood/qnap/ts-219/serial/">http://www.cyrius.com/debian/kirkwood/qnap/ts-219/serial/</a></p>
<p dir="ltr">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?</p>
<p dir="ltr">Anything to avoid?</p>
<p dir="ltr">Probably wishful thinking, but.. I guess TTL to USB
wouldn't work without intervening electronics?</p>
<p dir="ltr">Cheers<br>
James <br>
</p>
<br>
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<br>
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