Specifications

164 Chapter 13

Using LAN

Interactive Control by Telnet

When connected to a LAN, the 4287A supports interactive control that uses telnet (an

interface program for the telnet protocol).

A control procedure that uses telnet is described below through a simple example in which

the 4287A (IP address: 1.10.100.50, host name: 4287a) is controlled from an external

computer running a Windows operating system.

Step 1. Start up the external computer’s screen to show the MS-DOS prompt.

Step 2. At the MS-DOS prompt, type either “telnet 1.10.100.50” or “telnet 4287a” and press the

Return key.

Step 3. After the telnet terminal window opens, the computer connects to the 4287A, and the

terminal window shows a welcome message as shown in Figure 13-3. (In a UNIX

environment, a welcome message appears under the line in which you typed “telnet

1.10.100.50”.)

Figure 13-3 Sample screen of telnet-based control (immediately after connection)

Step 4. Enter a command below the welcome message and press the Return key. The command is

then sent to the 4287A, where it is actually executed. Also, when you type a Query

command and press the Return key, the Query response appears below the line where you

entered the command. For example, if you reset the instrument using the :SYST:PRES

command on page 306 and set measurement parameters 1 and 2 to Ls and Q using the

:CALC:PAR{1-4}:FORM command on page 230, you would be presented with a screen

like Figure 13-4 after the settings have been accepted.

NOTE If each character you have entered appears twice, disable the local echo feature of your

telnet program. Note that local echo is a feature that echoes entered characters on screen.