HP 170X HP JetDirect 170X - Installation and Configuration Guide - Page 43

Print Files, Using FTP Printing, FTP Connections - print server drivers

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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. 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. Once an FTP session is opened, it remains active until either the client closes the connection or the connection is idle for 900 seconds (15 minutes). 6-2 FTP Printing

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6-2 FTP Printing
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.
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. Once an FTP session
is opened, it remains active until either the client closes the
connection or the connection is idle for 900 seconds (15 minutes).