Agilent Technologies 4294A Service Manual download pdf (Page 174)

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174 Chapter 12

Using LAN

Controlling the Agilent 4294A

You can control the 4294A, if connected to LAN, from an external controller. The

communication between an external controller and the 4294A is achieved by means of

connecting sockets created by individual processes and by forming a network path between

the process of the external controller and that of the 4294A. The sockets are endpoint nodes

of network connection, and Port 23 and Port 5025 are ready for use as the sockets on the

4294A side. Port 23 is for interactive control using telnet (a user interface program based

on the TELNET protocol), and displays a welcome message (Welcome to the 4294A) when

connection is established. Port 5025 is prepared to be used from a program, and displays no

welcome message.

You can also control the 4294A, by use of the dynamic data disk and Instrument BASIC

programs described earlier.

Control by use of sockets

Interactive control by use of telnet

A control procedure that uses telnet is described here by taking up an example in which

you control the 4294A (IP address: 1.10.100.50, host name: hp4294a) from an external

computer installed in a Windows environment.

Step 1. Start up the screen in which the MS-DOS prompt is ready.

Step 2. At the MS-DOS prompt, type either telnet 1.10.100.50 or telnet hp4294a,

and press the Return key.

Step 3. The telnet screen is started up, and a welcome message “Welcome to the 4294A” appears

on the screen. (In a UNIX environment, a welcome message appears under the line in

which you typed telnet 1.10.100.50.)

Step 4. Enter a command under the welcome message and press the Return key, then the command

is sent to the 4294A and run. Enter a Query command and press the Return key, then a

Query response is displayed.

Figure 12-3 shows the screen that appears after you reset the

4294A by use of the “PRES” command (page 404), set the sweep start point and end point

to 10 MHz and 20 MHz respectively by use of the “STAR” command (page 444) and

“STOP” command (page 446), and checked these settings.

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