GE GFK-1852 user manual Port Number

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Port Number

Every TCP connection and every UDP datagram are defined by a destination IP address and a port number. An IP address is necessary to address a device (host) on the network. A port number is necessary to address an application or a channel on a network host. The port number can be compared to an extension on a PBX (telephone) system.

A Telnet application (login to a host with an ASCII terminal) is commonly assigned TCP port number 23. More than one Telnet connection can be established to one host using the Telnet port; however, the other peer IP address/port number combination must be different.

In the VMSE (PassThru Firmware), a port number can be configured on the channel (port). The VMSE uses this port number for outgoing messages and incoming connections or UDP datagrams, which are addressed to its port number. Port 9999 (decimal) is used for remote configuration.

3-2 VersaMax Serial to Ethernet Adapter User's Manual – July 2000 GFK-1852