On Fri, 6 Jun 1997 09:30:11 -0700, you wrote:


>     Now the question is, is there such a solution for other direction (TTL
>in, RS232 out)? I looked at prices for MAXIM single supply transceiver
>devices and they are EXPENSIVE!
>

I found this years ago and it works great, tested on several machines
and long cable length (>>30m ).


                         + 5V    +5V
                         |       \
                         \       / 2K2
                         E\ |    \
               BC557       \|    |
                           /|----+--/\/\/\/\--- TTL In
                         C  |         10K
DB9 (2) ----------------+
                        |
                        \
                        /  2K2
                        \              + 5V
                        /              |
                  +-----+              \
                  |     |              / 10k
                  |   -----            \
                \--/  ----- 10n        /
       1N4148    \/     |              |-----------TTL Out
                -----  _|_GND       | /C
                  |          10k    |/
DB9 (3) ----------+---------/\/\/---|\   BC547
                                    | \E
                                       |
                                      _|_
                                      GND
Best Regards
Gena