RS232TTL Board


There is nothing special with this little board. The schematic is standard (from MAX323/MAX232N datasheet).
Although there are hundreds of projects that treat this topic, I felt the need to redesign in gEDA.
The main reasons are as follows:

  • I tried to make schematic easier to follow when make this project on perfboard/stripboard.
  • I put also RTS and CTS signals (little used in most microcontroller projects).
  • PCB design include mounting holes, can be easily added to a final project (without having to make improvisations in mechanical system).
  • Modular design – RS232 support is used when it is needed (In fact, I started this project because I needed only temporary a serial link)
  • gEDA schematic and PCB can be easy included in another (bigger) custom project


RS232TTL schematic



0 RS232TTL

Ordinary components. For MAX232N 1uF polarised capacitors can be replaced with 0.1uF unpolarised capacitors.

1 RS232TTL

I bent pins to match the board step. I chose to bend 4 pins, not 5.

2 RS232TTL

I drill two holes ~ 3mm, at ~ 25mm distance.

3 RS232TTL

DB9 female connector fits perfectly. In accordance with Wikipedia this connector is correctly called DE-09, but as long as almost everyone uses DB9, I will keep this name.

4 RS232TTL

Connector soldered.

5 RS232TTL

Almost all components in place.

6 RS232TTL

… and soldered.

7 RS232TTL

Finished board.


Below is a preview of the board as it was generated by gEDA.
The design was made rugged; often RS232 cables are heavy and stiff and we want better mounting of this board (in a final project).

9 RS232TTL-front

10 RS232TTL-back

gEDA project

Download gEDA Project from here:RS232TTL gEDA

Updated: April 16, 2015 — 12:56 am

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