UEXT Adapter (UX-232F)
UEXT Adapter RS-232 DB-9F (DCE), Unpopulated 2 Sided PCB, 1.40 x 1.50 in (35.6 x 38.1 mm)


  • RS-232 to logic level adapter with DB9F connector (DCE style) and power LED.
  • UEXT standard 2x5 header pinout for interchangeable serial interface modules.
  • Bare PCB only (unpopulated, no parts provided).  BOM and schematic available for download.
  • All thru-hole construction allows for easy assembly. A DIP IC socket option allows easy IC replacement. 
  • Double-sided, FR4 glass-epoxy PCB, 1oz/ft2 copper, anti-tarnish coating. Soldermask & silkscreen.  Lead free and RoHS compatible.

The PCB-UX-232F is a bare PCB to build the UX-232F logic-level to RS-232 adapter. This is an unpopulated board and no parts are included. The BOM (bill of materials) and schematic diagram are available at http://www.busboard.us/products/UX-232F/ to construct the circuit. Soldering is required and prior experience with electronic assembly is recommended. A PCB soldermask helps prevent solder bridges on tracks and a silkscreen legend provides part locations.

The UX-232F uses the Olimex style UEXT 2x5 header for peripheral expansion boards. UEXT is an open standard developed by Olimex providing 3 Volt I2C, SPI, and USART signals on one connector. This board uses only the UART Tx and Rx signals. A 10-pin ribbon cable is used to connect to UEXT connectors on microcontroller boards.

The UX-232F provides a DCE RS-232 serial port with a DB9 female connector. Drivers are provided for the Tx and Rx lines with the other port lines unconnected. All thru-hole construction allows for easy assembly, maintenance, and modification. A DIP IC socket can be used to allow easy IC replacement to use different voltage/feature parts or to replace damaged parts.

A power LED provides a visual indication of power status. It can be used with RS-232 converter ICs using the MAX3232 16-pin DIP pinout. The Exar SP3232ECP-L is recommended for 3V operation, and it also provides ESD protection.


PDF - 324KB

PDF - 81KB

UEXT Pinout
PDF - 98KB
Where to Purchase:

SKU#: 854-PCB-UX-232F