Rs232 serial adaptor

Introduction

This is the classical rs232 serial adaptor. I needed this page because, at some places, I am making reference to it !

Schematics

The essential is in the schematic. It is designed for 5 Volts, but works fine at 3.3 Volts and 115200 bauds.

rs232 serial adaptor schematic

A picture of the assembly.

rs232 serial adaptor assembly

There is only need of one adaptor for one cable to connect to pc, instead of an adaptor per board.

There is an unused pin on test board connector, to avoid reverse power the board.

As all boards are wired in the same way, you need to cross the rx, tx wires to interconnect 2 boards.