Measurement-computing CIO-DAS801 Manuel d'utilisateur télécharger pdf (Page 10)

CIO-DAS801 User's Guide Installing the CIO-DAS801

HEX

200

100

Figure 1. Base address switches

In the default configuration shown in Figure 1, addresses 9 and 8 are DOWN, and all others are UP.

Address 9 = 200 hex (512 decimal) and address 8 = 100 hex (256 decimal); when added together they equal

300 hex (768 decimal).

Disregard the numbers printed on the switch

When setting the base address, refer to the numbers printed in white on the printed circuit board.

PC I/O addresses

Hex Range

Function

Hex Range

Function

000-00F

8237 DMA #1

2C0-2CF

EGA

020-021

8259 PIC#1

2D0-2DF

EGA

040-043

8253 Timer

2E0-2E7

GPIB (AT)

060-063

8255 PPI (XT)

2E8-2EF

Serial Port

060-064

8742 Controller (AT)

2F8-2FF

Serial Port

070-071

CMOS RAM & NMI mask (AT)

300-30F

Prototype card

080-08F

DMA page registers

310-31F

Prototype card

0A0-0A1

8259 PIC #2 (AT)

320-32F

Hard disk (XT)

0A0-0AF

NMI mask (XT)

378-37F

Parallel printer

0C0-0DF

8237 #2 (AT)

380-38F

SDLC

0F0-0FF

80287 numeric CO-P (AT)

3A0-3AF

SDLC

1F0-1FF

Hard disk (AT)

3B0-3BB

MDA

200-20F

Game control

3BC-3BB

Parallel printer

210-21F

Expansion unit (XT)

3C0-3CF

EGA

238-23B

Bus mouse

3D0-3DF

CGA

23C-23F

ALT bus mouse

3E8-3EF

Serial port

270-27F

Parallel printer

3F0-3F7

Floppy disk

2B0-2BF

EGA

3F8-3FF

Serial port

Input configuration

You can configure each analog channel for differential or single-ended input. You can set the input of each

channel using the bank of switches labeled S2 (0 through 7) on the board. These switches correspond to

channels 0 to 7 of the analog inputs.

The switches are set by default for differential input. Differential inputs are 3-wire analog hookups consisting

of a signal high, signal low and chassis ground. The benefits of differential inputs are the ability to reject noise

which affects both signal high and low, and the ability to compensate for ground loops or potentials between

signal low and chassis ground.

Although differential inputs are often preferable to single ended inputs, the floating nature of a differential

input can make getting an accurate reading difficult. In those cases, the CIO-DAS801 inputs can be converted

to single-ended or modified differential.

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Measurement-computing CIO-DAS801 Manuel d'utilisateur Page 10

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