Agilent Technologies 4294A Service Manual download pdf (Page 184)

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184 Chapter 12

Using LAN

Controlling the Agilent 4294A

Example of control

Like autoscale (subprogram executed when the Auto Scale button is pressed) shown in Example

12-8, executing subprograms above in the sequence above will allow you to control the 4294A.

Example 12-8 autoscale

Sub autoscale()

' auto scaling

Call StartIt

Call get_hostname

x = OpenSocket(Hostname$, ScpiPort)

x = SendCommand("AUTO")

Call CloseConnection

Call EndIt

End Sub

NOTE When you execute more than one command by connecting and disconnecting a socket for every

command, the sequence of execution may change.

• Connection → Command 1 → Command 2 → Disconnection

Commands 1 and 2 are always executed in this sequence.

• Connection → Command 1 → Disconnection → Connection → Command 2 →

Disconnection

These commands may be in the sequence of Command 2 → command 1.

Control by making use of the dynamic data disk

You can achieve control from a program via LAN by combining Instrument BASIC

programs and file transfers by use of the dynamic data disk. The procedure is given below.

Step 1. Transfer an Instrument BASIC program you want run to the dynamic data disk from an

external controller under the name prog_run.bas.

Step 2. After having quit the program, transfer necessary measurement data (data_dt.dat and the

like) to the external controller from the dynamic data disk.

NOTE Either in an instance in which you need to work on a measurement result by use of a certain

program or in an instance in which you need to obtain a result (a result of limit test, or the

like) that cannot be transferred directly from the dynamic data disk, write a program in

such a way that it once stores necessary data in a file held on the storage devices of the

4294A, and transfer that file to the external controller after the program quits.

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