<div dir="ltr">Hi James,<div><br></div><div>The stuff from the UK is made in China most of the time. I've never had an issue with these serial ports, I use them for my amateur radios and other things.</div><div><br></div><div>I think I know just the beast.</div><div><br></div><div><a href="http://www.ebay.co.uk/itm/New-PL2303HX-Converter-USB-To-RS232-TTL-Serial-Cable-Adapter-Modul-/131269434836?pt=UK_Computing_Other_Computing_Networking&hash=item1e90449dd4">http://www.ebay.co.uk/itm/New-PL2303HX-Converter-USB-To-RS232-TTL-Serial-Cable-Adapter-Modul-/131269434836?pt=UK_Computing_Other_Computing_Networking&hash=item1e90449dd4</a><br></div><div><br></div><div>I've used these a couple of times. Ubuntu recognises them no problem (Windows can be an issue). </div><div><br></div><div>You can get them from Amazon but they will be made in China (what isn't?).</div><div><br></div><div>If you prefer something which will also work with Windows, look for FTDI or CP210? (eg CP2104) chip ones. The Prolific chipset ones (PL series) can have driver issues with Windows. </div><div><br></div><div>I've also used ones like this:</div><div><br></div><div><a href="http://www.ebay.co.uk/itm/Convenient-Module-Serial-Converter-USB-2-0-to-TTL-UART-6PIN-CP2102-STC-PRGMR-/271424127737?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item3f322382f9">http://www.ebay.co.uk/itm/Convenient-Module-Serial-Converter-USB-2-0-to-TTL-UART-6PIN-CP2102-STC-PRGMR-/271424127737?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item3f322382f9</a><br></div><div><br></div><div>The first one has the advantage that is it all 'sealed' and has a cable.</div><div><br></div><div>You can't really do any damage, unless you short something to the power supply. </div><div><br></div><div>They will 'connect' as serial tty devices and you can set the baud rate etc. as normal. </div><div><br></div><div>I assume you are in Kent, are you close to Medway? I'm near J4 of the M2. You can borrow one to try, if you like.</div><div><br></div><div>Brian</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On 5 January 2015 at 13:46, jwmartnet . <span dir="ltr"><<a href="mailto:jwm.art.net@gmail.com" target="_blank">jwm.art.net@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On 5 January 2015 at 00:11, Brian Reay <<a href="mailto:brian.reay@gmail.com">brian.reay@gmail.com</a>> wrote:<br>
> What are you trying to do?<br>
><br>
<br>
</span>View TTL serial console of QNAP device on Linux PC.<br>
<span class=""><br>
> In particular, does the device you wish to connect to (not the PC, the other<br>
> 'end') have RS232 or TTL levels? If it is TTL and just Tx and Rx data ( plus<br>
> ground) then a USB device like I mentioned should be fine.<br>
<br>
</span>Yes TTL, with TX & RX, plus a green VCC cable. I found another page<br>
for achieving similar with freeBSD, saying to look for FT232 based<br>
chips for USB connectors.<br>
<br>
Some of them say 3.3v & 5v. Is the 5v the USB side, and the 3.3v the<br>
TTL side? Or some mention a switch - is that to switch between 3.3v or<br>
5v?<br>
<br>
Are the cheap items shipped from China risky? (Hi-powered bicycle<br>
lights from China have a bad rep for exploding batteries,<br>
over-charging, etc).<br>
£2 from China or £10 from UK.<br>
<br>
Then am I right to guess the items listed for the Arduino might be a<br>
good choice? Quality, reliable UK based distributor, etc.<br>
<span class=""><br>
> It will appear as<br>
> a serial device under Linux just like any other serial port. All the ones<br>
> I've used, Ubuntu has had the drivers already installed.<br>
<br>
</span>Thanks for your help.<br>
James.<br>
<div class="HOEnZb"><div class="h5"><br>
><br>
> Brian<br>
><br>
><br>
> On Sunday, 4 January 2015, jwmartnet . <<a href="mailto:jwm.art.net@gmail.com">jwm.art.net@gmail.com</a>> wrote:<br>
>><br>
>> Thanks for your replies, but I'm clueless about electronics (and<br>
>> evidence seems to be stacking up against me in related areas too).<br>
>><br>
>> The USB things look preferable, and avoid the need to get a serial<br>
>> cable (and enable the serial port in pc bios) ... I just don't know<br>
>> what the right thing to get would be. The product description in the<br>
>> second of those ebay listing you gave, Brian, doesn't fill me with<br>
>> confidence!<br>
>><br>
>> Thanks.<br>
>><br>
>><br>
>><br>
>><br>
>> On 3 January 2015 at 16:53, Brian Reay <<a href="mailto:brian.reay@gmail.com">brian.reay@gmail.com</a>> wrote:<br>
>> > They are bidirectional in that that the inputs RS232 "side" are convert<br>
>> > to<br>
>> > 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)<br>
>> > which<br>
>> > have a TTL level output. They are a simple serial interface, ie little<br>
>> > if<br>
>> > any data control signals. 'Flying lead' ends.<br>
>> ><br>
>> > I've used ones like both of these:<br>
>> ><br>
>> ><br>
>> > <a 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" target="_blank">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>
>> ><br>
>> > <a 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" target="_blank">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 href="http://www.g8osn.net" target="_blank">www.g8osn.net</a><br>
>> ><br>
>> ><br>
>> ><br>
>> > On 03/01/15 16:35, jwmartnet . wrote:<br>
>> ><br>
>> > Hi,<br>
>> ><br>
>> > I want to connect a serial console to my device but need a bit of advice<br>
>> > before purchasing components.<br>
>> ><br>
>> > According to the article linked below, I need a ' 3.3V TTL to RS-232<br>
>> > level<br>
>> > shifter'<br>
>> ><br>
>> > <a href="http://www.cyrius.com/debian/kirkwood/qnap/ts-219/serial/" target="_blank">http://www.cyrius.com/debian/kirkwood/qnap/ts-219/serial/</a><br>
>> ><br>
>> > Do these converters work bidirectional? Or does it specifically need to<br>
>> > be<br>
>> > 3.3V TTL to RS-232 and not RS232 to 3.3v TTL?<br>
>> ><br>
>> > Anything to avoid?<br>
>> ><br>
>> > Probably wishful thinking, but.. I guess TTL to USB wouldn't work<br>
>> > without<br>
>> > intervening electronics?<br>
>> ><br>
>> > Cheers<br>
>> > James<br>
<br>
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<a href="https://mailman.lug.org.uk/mailman/listinfo/kent" target="_blank">https://mailman.lug.org.uk/mailman/listinfo/kent</a></div></div></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature"><b><i>Brian Reay</i></b><br><a href="http://www.g8osn.net" target="_blank">www.g8osn.net</a><br></div>
</div>