Measurement-computing Personal488 rev.3.0 Manual do Utilizador descarregar pdf (Página 63)

Personal488 for Windows 95/98/Me/NT/2000

04-09-01

Using IEEE 488 5-9

For this example, we select the

Enter

command. The

Enter

command,

returns the number of characters

actually read. In this example the

return is 256.

The

command is used to close

an open device handle.

should

be called before ending a program. For

the most part, all handles will be

forcibly closed when a program

terminates. However, in some

instances handles can remain active due

to the driver remaining in memory after

program termination. If a handle

remains open, no other programs will

be able to access it including the

program that left the handle open.

This completes a simple transaction. Your application will no doubt be more complex; however, it will still

consist of

•

opening a device name

•

programming a device

•

reading data from the device

In this example we only discussed a small subset of the available API commands. You can use WinTest to

explore other API function calls. Refer to the API Reference section of this manual for additional

information regarding each command.

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Measurement-computing Personal488 rev.3.0 Manual do Utilizador Página 63