5730A
Operators Manual
5-10
Establish an Ethernet Connection
Telnet is the easiest method of establishing an Ethernet connection with the 5730A
Calibrator. Telnet is a client-server protocol, based on TCP. The Telnet Protocol provides
a fairly general, bi-directional, eight-bit byte oriented communications method. Telnet is
available on all UNIX servers and on most PCs.
Telnet clients typically connect to hosts on socket port 23. The LAN connection to the
Calibrator must be established with the specified Network Socket Port. See the
“Configure the General Network Socket Port” section. When the remote interface port is
changed to LAN from the Calibrator front panel, a LAN server is initiated in the
Calibrator that listens for client connections on the socket port at the specified IP address.
To establish a LAN connection to the Calibrator from a computer with either UNIX,
LINUX, or MS-DOS command prompts, do the subsequent procedure:
1. Touch Setup Menu>Instrument Setup>Remote Port>Ethernet Setup to get to the
Ethernet Setup menu.
2. Change the remote interface port to Ethernet.
3. At the command prompt on the client computer, enter:
telnet <IP Address> <Socket Port>
As an example, if the IP address is known to be 129.196.136.131 and the Socket Port
is set to 3490, at a command prompt from any client computer, enter:
telnet 129.196.136.131 3490
Once the internal LAN server connects with the client computer, the LAN server will
reject any other connection attempts by other computers/clients and will “tunnel” a
channel to the connected computer. This prevents multiple computers from trying to
control the Calibrator.
Terminate an Ethernet Connection
To terminate the Ethernet connection, the Telnet session must be terminated on the client
computer. Switching remote control ports will also terminate the Telnet session.
It may be necessary to terminate the Telnet session on the client computer but maintain
the current LAN remote interface port selection. Client Telnet session termination can
vary from computer to computer. Typically, terminating the shell (or command window
in DOS) will terminate the Telnet session. When the client terminates the Telnet session,
the LAN server in the Calibrator goes back into listen mode waiting for a new client to
make a LAN connection request.
Use of Ethernet Remote Control
When the Ethernet port is used to remotely control the 5730A Calibrator, either
interactively with a terminal or under computer control, operation is the same as with an
RS-232 controller connected to the RS-232 port for control.
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