I have a temperature measurement kit (PIC12C672) that
uses a direct connect.  A series 22K from the PC TX to
the PIC, but straight from the PIC to the PC RX.  I
really don't depend on the sales and reasoned that I
could either redesign or pull the kit if there were
problems.

After some 18 months, I have sold some 250 kits with
no complaints.

My confidence in taking this approach was bolstered a
bit in looking at the NetMedia BX24 (much improved
Basic Stamp) design which uses an onboard UART (Atmel
processor) with CMOS inverters.  That is, TTL logic
levels on the RS232 side.  I have sold thousands of
these BX24s with no problems related to improper RS232
levels.

Hope this helps.

Peter H. Anderson, http://www.phanderson.com,
pha(at)phanderson.com

--- Trevor Page <trevor.page@PACE.CO.UK> wrote:
> Hi all,
>
> What is the general opinion concerning the use of a


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