The HP Jetdirect FTP server transfers print files to the printer but
does not interpret them. For proper printing, print files must be in
a language recognized by the printer (such as PostScript, PCL, or
unformatted text). For formatted print jobs, you must first print to
a file from your application using the driver for the selected printer,
then transfer the print file to the printer through an FTP session.
For formatted print files, use binary (image) type transfers.
Using FTP Printing
Similar to standard FTP file transfers, FTP printing uses two TCP
connections: a control connection and a data connection.
Once an FTP session is opened, it remains active until either the
client closes the connection or the data and control connections
are idle for a time that exceeds the idle timeout period (default is
270 seconds). The idle timeout can be set through various TCP/IP
configuration tools, such as BOOTP/TFTP, Telnet, printer's control
3), the embedded Web server (see
FTP Printing 175