App-66
IM 701210-06E
Appendix 14 TCP and UDP Port Number Used in
Ethernet Communications
The TCP and UDP port numbers that are used on the Ethernet interface of the DL750/
DL750P are as follows:
TCP Port Numbers
Port Number Description Function
20 File Transfer [Default Data] FTP server, FTP client*, and a portion of the
Web server
21 File Transfer [Control] FTP server, FTP client, and a portion of the
Web server
25 Simple Mail Transfer Protocol SMTP client
80 World Wide Web HTTP Web server and WebDAV server
515 - LPR client
10001 - Instrument control via the Ethernet interface
UDP Port Numbers
Port Number Description Function
67 Bootstrap Protocol Server DHCP client
68 Bootstrap Protocol Client (receive wait port)
123 Network Time Protocol SNTP client
* The port number when FTP passive mode (see section 16.10) is turned OFF. If FTP passive
mode is turned ON, the port number is arbitrary.
If FTP passive mode is OFF, connection is established from the server. If you are connecting
the DL750/DL750P behind a firewall, turn FTP passive mode ON.
For the procedure of changing the FTP passive mode, see section 16.10.
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