Your Electronics Open Source

Schematic

The schematic is very simple, practically the FT232BM integrated does everything. As a particularity you notice the feeding VCC=5V directly taken from the USB port and the optional 93C46 memory, for saving an eventual identification and therefore to distinguish the card from other similar devices connected to the USB port.

Moreover, in the upper right I have inserted a SN75176 (RS485 driver) that through the JP1-4 bridge allows you to modify the card into USB-RS485 converter.