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ADC500 ISA-bus A/D Converter

The ADC500 ISA-BUS A/D CONVERTER is a 12-bit, 8-channel ISA-bus analog-to-digital converter card that

connects our spectrometers to desktop PCs. This single-ended, half-length card fits into an ISA slot in a desktop

PC, and has a 500 kHz sampling frequency. The following are directions for installing your ADC500. Because

A/D converter installation goes hand-in-hand with software installation, you will find directions for installing

OOIBase32 Spectrometer Operating Software included in this section as well.

Each device in or connected to your computer is assigned specific settings; it’s similar to giving each device its

own name so that your computer will know what to call and how to recognize the device. In order for your

ADC500 to work as a device in your computer, it has to be assigned a Base Address setting and an IRQ setting.

The default settings for each are:

Base Address (I/O Range): 768 decimal (300 hexadecimal)

IRQ (Interrupt Request): 07

These default values are set on the A/D converter. There are dip switches on the A/D board and their positions

determine the values. These default values are set in the operating software as well. Most of the time, these default

settings will work with your computer. However, if you have many devices installed in your computer, you may

have a conflict; other devices may be using these settings. If there is a conflict with another device in your

computer, you must change the positions of the switches on the A/D board and change the values in the software.

For the ADC500, the Base Address is set via the bank of 6 switches labeled SW1 on the A/D board and the IRQ is

set via the bank of 4 switches labeled SW2 on the A/D board. To first check your computer to see which settings

are available, see the section below.

Find Available Base Address and IRQ Settings

1. Go to Start | Settings | Control Panel and double-click on the System icon.

2. Choose the Device Manager tab and double-click on “Computer” at the top of the list.

3. Under View Resources, find available settings -- numbers unassigned to hardware. Note these available

settings for both the Interrupt request (IRQ) and the Input/output (Base Address). When you first run

OOIBase32, you must enter these values in the “Configure Hardware” dialog box. (Remember that

Input/output settings are expressed in hexadecimal.)

For most computers, the default settings work well. In the picture above left, it appears that the Printer occupies

IRQ 07, but for most computers, our A/D converters can share the IRQ 07 setting with a printer and conflicts

will not arise. All computers have multiple Base Address (Input/output) settings from which to choose.

Operating Instructions: ADC500 (for Windows 95/98 Users)

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Summary of content (6 pages)

PAGE 1
Operating Instructions: ADC500 (for Windows 95/98 Users) ADC500 ISA-bus A/D Converter The ADC500 ISA-BUS A/D CONVERTER is a 12-bit, 8-channel ISA-bus analog-to-digital converter card that connects our spectrometers to desktop PCs. This single-ended, half-length card fits into an ISA slot in a desktop PC, and has a 500 kHz sampling frequency. The following are directions for installing your ADC500.
PAGE 2
Operating Instructions: ADC500 (for Windows 95/98 Users) Install the ADC500 1. 2. 3. 4. 5. 6. Turn off the computer and remove the computer cover. Ground yourself to the computer chassis or power supply and remove the A/D card from its static-shielded bag. If necessary, change the position of the switches on the A/D board. Position the switches to match the available settings you found in the previous section -- numbers not being used by other hardware devices.
PAGE 3
Operating Instructions: ADC500 (for Windows 95/98 Users) A file open dialog box then appears. Navigate to the OOIBase32 directory, and choose the default spectrometer configuration file -- the file with .spec as the extension, preceded by the serial number of your spectrometer. (A default spectrometer configuration file will be named something similar to I2J613.spec.) Configure Hardware Dialog Box Next, the Configure Hardware dialog box opens.
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Operating Instructions: ADC500 (for Windows 95/98 Users) " The Detector Linearity page in this dialog box allows you to enter coefficients for an algorthim that corrects for rare occurances of non-linearity of the detector. Contact Ocean Optics for more information. Save the spectrometer configuration file by choosing Spectrometer | Save Configuration As from the OOIBase32 menu. You can rename the file or use the default file name ([your serial number].spec).
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Operating Instructions: ADC500 (for Windows 95/98 Users) Changing the Base Address Settings for the ADC500 To change the Base Address settings on the ADC500 board, see the bank of 6 dip switches labeled SW1. Switches in the OFF position have the decimal values shown. Switches in the ON position have a value of zero. The Base Address is the sum of the values of the switches. In the default setting, switches 5 and 6 are added to give a total of 768.
PAGE 6
Operating Instructions: ADC500 (for Windows 95/98 Users) Changing the Interrupt Request Settings for the ADC500 To change the IRQ settings on the ADC500 board, see the bank of 4 dip switches labeled SW2. In the default setting, the IRQ is set to 7. Other combinations for IRQ settings are below. After you have changed the switches, reinstall the card and change the software settings to match the hardware settings. (See pages 1-4 for instructions.) The gray block indicates the position of the switch.