Print Files; Using Ftp Printing - HP 300X - JetDirect Print Server Administrator's Manual

Print Files

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

FTP Connections
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 900 seconds (15 minutes). (This setting cannot be
configured.)
Control Connection
Using standard FTP, a control connection is opened by the client to
the FTP server on the HP Jetdirect print server. FTP control
connections are used to exchange commands between the client and
the FTP server. The HP Jetdirect print server supports up to three
control connections (or FTP sessions) simultaneously. If the number
of allowed connections is exceeded, a message indicating that
service is not available will be displayed.
FTP control connections use TCP port 21.
Data Connection
A second connection, a data connection, is created each time a file
is transferred between the client and the FTP server. The client
controls the creation of a data connection by issuing the commands
that require a data connection (such as FTP ls, dir or put
commands).
54 FTP Printing
ENWW