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This deluxe (unsoldered) serial port adapter (RS-232 adapter) converts 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. This item is the partial kit version of the 23201a serial adapter. All surface-mount components are assembled; the 0.1″ breakaway male header strip and DB9 connector are included but not soldered.