Measurement-computing Personal488 rev.1.0 Manuel d'utilisateur télécharger pdf (Page 29)

Personal488 for Windows 95/98/Me/NT/2000/XP 889496 Hardware Configuration Reference 4-3

AT488 Configurations

The I/O base address, IRQ, and DMA settings are switch/jumper selectable via the following

locations on the AT488 interface board: One 2-microswitch DIP switch labeled S1, one

4-microswitch DIP switch labeled S2, two 14-pin headers labeled DACK and DRQ, and one

22-pin header labeled IRQ. The DIP switch settings, and the arrangement of the jumpers on

the headers set the hardware configuration.

For the next steps, make sure that the I/O address, IRQ, and DMA set on the interface board

are different from any existing ports in your system. A conflict results when two I/O

addresses, IRQs, or DMAs are the same. (As the exception, additional AT488 interfaces may

share the same IRQ and DMA values.) If there is a conflict, reconfigure the switch/jumper

settings. Refer to the following figures as needed.

Configuring the AT488 Interface I/O Base Address

Interrupt Level 5

DMA 16-Bit Channel 5

Base Address

02E1

Interrupt

Level 5

AT488 Default Settings

DACK

DRQ

IRQ

AT488 I/O Base

Address Selections

42E1

62E1

22E102E1

5 6 7 0 1 2 3

OPEN

OPEN OPEN

OPEN

1 2

1 2 1 2

1 2

1 2 3 4

OPEN

The factory default I/O base address is 02E1. If this creates a conflict, reset switch S1

according to the figure and following table. The register addresses will be automatically

relocated at fixed offsets from the base address. If reset, record the new Input/Output (I/O)

address being used.

Selected I/O Base

Address

02E1 22E1 42E1 62E1

Automatic Offset Addresses Read Register Write Register

02E1 22E1 42E1 62E1 Data In Data Out

06E1 26E1 46E1 66E1 Interrupt Status 1 Interrupt Mask 1

0AE1 2AE1 4AE1 6AE1 Interrupt Status 2 Interrupt Mask 2

0EE1 2EE1 4EE1 6EE1 Serial Poll Status Serial Poll Mode

12E1 32E1 52E1 72E1 Address Status Address Mode

16E1 36E1 56E1 76E1 CMD Pass Through Auxiliary Mode

1AE1 3AE1 5AE1 7AE1 Address 0 Address 0/1

1EE1 3EE1 5EE1 7EE1 Address 1 End of String

The I/O base address sets the addresses used by the computer to communicate with the IEEE

488 interface hardware on the board. The address is normally specified in hexadecimal and

can be 02E1, 22E1, 42E1, or 62E1. The registers of the IOT7210 IEEE 488 controller chip

and other auxiliary registers are then located at fixed offsets from the base address.

Most versions of Driver488 are capable of managing as many as four IEEE 488 interfaces. To

do so, the interface configurations must be arranged to avoid conflict amongst themselves.

No two boards may have the same I/O address; but they may, and usually should, have the

same DMA channel and interrupt level.

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Measurement-computing Personal488 rev.1.0 Manuel d'utilisateur Page 29

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