Pololu 23201a Serial Adapter Fully Assembled

This deluxe serial port adapter (RS-232 adapter) to convert logic-level signals to the higher voltages required for RS-232 and similar serial ports. Unlike competing units, the Pololu serial adapter operates over a 3-5.5 V supply range and gives you access to all eight of the signal lines available on a DB9 connector, including five transmit lines and three receive lines.