Measurement-computing CIO-DAS16/Jr Instrukcja Użytkownika Pobierz pdf (Strona 10)

CIO-DAS16/Jr User's Guide Installing the CIO-DAS16/Jr

Base address switch

The board is shipped with the base address set to 300 hex. Unless there is already a board in your system that

uses address 300 hex (768 decimal), leave the switches as they were set at the factory. In the example shown in

, the board is set for base address 300 hex (768 decimal). Figure 2

Figure 2. Base address switch

HEX

200

100

987654

Frequency select jumper

Use the frequency select jumper to set the frequency of the source applied to the on-board pacer to either 1 MHz

(default) or 10 MHz.

The frequency select jumper is incorporated in the board design because the original DAS-16, designed in 1984,

had a 1 MHz crystal. When MetraByte redesigned the DAS-16 and added the faster 10 MHz crystal, a jumper

was provided to maintain compatibility with older software. The CIO-DAS16/Jr has a select jumper because the

DAS-16 has the jumper. Older software may require that you set the 1 MHz setting for this jumper.

Use the 10 MHz setting for any new software development to achieve better resolution setting pacer

frequencies.

MzH

Figure 3. Frequency select jumper

Analog channel number select switch

Use the analog input mode-select switch to configure the board for eight differential (default) or

16 single-ended inputs. Using differential inputs allows up to 10 volts of common mode (ground loop) rejection.

168

Figure 4. Analog channel number select switch

DMA level select switch

Use the direct memory access (DMA) level-select switch to set the DMA level to either 1 (default) or level 3.

Unless you have another board in your system using DMA level 1, leave the DMA level-select switch at the

level 1 position ( ). Figure 5

Figure 5. DMA level select switch

Some network boards use DMA, and so do some IEEE-488 interface boards. If you suspect a conflict with

another board in the system, change this switch to DMA level 3.

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Measurement-computing CIO-DAS16/Jr Instrukcja Użytkownika Strona 10