OK max:
Take a look at the following datasheet for the MAX232
**broken link removed** and see if anything makes sense to you.
And also take a look at this:
**broken link removed**
This would be the basis of the design.
A tri-state inverter or buffer and another part is necessary too, to "glue" this together.
These uC's
Comfile Technology Inc. are programmable in BASIC and Ladder Logic. Most have 2 serial ports and one has 4 serial ports and a real-time clock (RTC). The RTC could prove useful for your project. The main website is
Welcome to Comfile Technology, Creator of Industrial Innovations .
i
I did not evaluate the suitability of the language. The