I think this should work, but can't remember if rx & tx are the right way round. Google TTL-232R-3V3-AJ.
From what I remember there were 2 versions of pbl, one was hacked to allow a new kernel. The upgraded version was encrypted / required a signed binary. But Amstrad never released the key. 
the kernel on the hacked version was a 2.4 Linux. The community upgraded it to 2.6 but it wasn't given a front end HMI.
I seem to remember massive incompatibility / a lot of patching to get it building on the latest version of Linux & busybox at the time (2007).

On Thu, 4 Apr 2019 17:57 David Given, <dg@cowlark.com> wrote:
It's probably a typo, but just to check: you said 15200, but it should be 115200?

On Thu, 4 Apr 2019, 18:52 Nick Griffin, <span1922@live.com> wrote:
Could it be that I might have the RX and TX round there wrong way..? red is TX (Ring) so it connected to TX pin on CP 2102,White is RX (Tip) so it connected to RX pin on CP 2102,black is Ground (Sleeve) connected to GND pin on CP 2102..??

Spanner..

From: Nick Griffin
Sent: ‎Thursday‎, ‎4‎ ‎April‎ ‎2019 ‎17‎:‎38
To: Discussion of the Amstrad E3 emailer hardware/software

This is my settings in putty, 15200, 8 bits, no parity and 1 stop bit. And no flow control.
from https://wiki.earth.li/E3_Getting_Started website.

Spanner..

From: Antony Stone
Sent: ‎Thursday‎, ‎4‎ ‎April‎ ‎2019 ‎16‎:‎51
To: Discussion of the Amstrad E3 emailer hardware/software

On Thursday 04 April 2019 at 17:47:21, Antony Stone wrote:

> On Thursday 04 April 2019 at 17:44:13, Nick Griffin wrote:
> > I have connected the CP2102 and I am getting garbage text in Putty..
>
> That suggests the wrong baud rate to me.

https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.cambridgewargames.org.uk%2Fmembers%2Fandy%2Femailer%2F&amp;data=02%7C01%7C%7C1582cfe263ef4d5cdbde08d6b915666b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636899898889909349&amp;sdata=zjSspT0Ft5FobfMYnBdrxtc6MvEywB4MRky%2B6hHxkaY%3D&amp;reserved=0 and
https://eur01.safelinks.protection.outlook.com/?url=http:%2F%2Fwww.earth.li%2F~noodles%2Fhardware-e3.html&amp;data=02%7C01%7C%7C1582cfe263ef4d5cdbde08d6b915666b%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636899898889919354&amp;sdata=rOH%2Fb0v1uOAfmesV3LLdYH3lctIkFptlTV4wZlWHIWU%3D&amp;reserved=0 say 115,200 8n1 no handshake.


Antony.

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> >  ▒V
> >
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> > ▒▒
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> > ▒▒▒
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--
Police have found a cartoonist dead in his house.  They say that details are
currently sketchy.

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