USB to RS232 converter
Why build my own USB to RS232 converter when there are adapters already available from many suppler?
The Answer is simple:
Neither the strand "USB to RS232 converter" actually worked *properly* with all the devices I tried. But, They did not seem to support ALL the RS232 lines.
The USB to RS232 converter using the FT8U232AM and a Maxim-IC MAX235
The FT8U232AM requires a small number of external components to produce a device that converts USB to TTL level RS232 signals. All you need to add is a TTL to RS232 converter to provide the 12V RS232 logic levels.
The FT8U232AM and supporting components is also available as a complete module - called a USBMOD1 - in a 32pin DIL IC package, making the whole project very easy to build.
Distributor information for the USBMOD1 is mentioned later.
The photo of finished Adapter:
กด Vero board
กด DB9 male socket
กด 2 x 100ohm resistors
กด 1uF Electrolytic Capacitor (16VW or higher).
กด 3mm RED LED
กด 3mm GREEN LED
กด MAX235 Integrated Circuit
กด USBMOD1 Hybrid Module
Window device driver:
Linux Device driver: