The RS-232C Serial Interface Card installs into the printer's internal port. It supports a standard RS-232C interface using a 25-pin D-shell female connector.
Serial
Y
Lexmark MX611de Lexmark MX511de Lexmark MX611dhe Lexmark MX511dhe Lexmark MX510de Lexmark MX511dte Lexmark MS610de Lexmark MS610dte