Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Uživatelský manuál stáhnout pdf (Strana 260)

II. SOFTWARE GUIDES - 10. Driver488/W31 10F. Visual Basic

Personal488 User’s Manual, Rev. 3.0 II-245

The ADC488/16A Acquisition Engine will have one form that sets up some of the parameters of the

instrument and provides a means of collecting and displaying the data. We will also include a means

for posting a server link specification in the clipboard, so Excel can perform a Paste Link operation.

Note: A similar example is also used within the

QUIKTEST

utility. For more information on this

utility, turn to the next Sub-Chapter “Utility Programs” in this Chapter.

All of the initialization happens in the following

Form_Load

service routine.

Sub Form_Load ()

LinkMode = 1

Chan.AddItem “1"

Chan.AddItem ”2"

Chan.AddItem “3"

Chan.AddItem ”4"

Chan.AddItem “5"

Chan.AddItem ”6"

Chan.AddItem “7"

Chan.AddItem ”8"

Chan.AddItem “9"

Chan.AddItem ”10"

Chan.AddItem “11"

Chan.AddItem ”12"

Chan.AddItem “13"

Chan.AddItem ”14"

Chan.AddItem “15"

Chan.AddItem ”16"

Chan.ListIndex = 0

Range(0).value = -1

text1.text = “”

StartFlag = 0

NL = Chr$(13) + Chr$(10)

End Sub

First the

LinkMode

is set to

SERVER (1)

. Then the combo box is initialized with the channel numbers

available from the ADC488/16A. After some form control initialization, the constant

(new line) is

defined as a string consisting of a carriage return and line feed. This will be used to put a new line

between readings.

Although the ADC488/16A has many programmable

features, for the sake of brevity, this application will only

exercise a few. This application provides controls to

adjust the channel voltage range and the desired channel.

The control where the collected data is returned is a text

box with its

Multiline

and

ScrollBar

properties set

TRUE

at design time.

A very small bit of code resides behind the option

buttons. The option buttons are configured as a control

array. The

Click

event is serviced by the same code

which sets the value of the global variable

Rng

to the

index number of the option control.

Sub Range_Click (index As Integer)

Rng = index

End Sub

When the Acquire button is pressed, executing the

Acquire_Click

routine, the pre-configured device

ADC488 is opened and cleared. Then a string of ADC488 commands are sent to the device using the

settings from the combo box and the variable

Rng

. Lastly, the global variable

StartFlag

is set to

(start).

ADC488/16A Acquisition Engine Form

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