Sensoray 425 Manual do Utilizador descarregar pdf (Página 5)

Page 3 Sensoray Model 425 Instruction Manual

Selecting a Base Address

First Address Nibble (MSB)

Adrs A15 A14 A13 A12

0 On On On On

1 On On On Off

2 On On Off On

3 On On Off Off

4 On Off On On

5 On Off On Off

6 On Off Off On

7 On Off Off Off

8 Off On On On

9 Off On On Off

A Off On Off On

B Off On Off Off

C Off Off On On

D Off Off On Off

E Off Off Off On

F Off Off Off Off

The 425 board occupies a block of 64 consecutive addresses

in the ISAbus 16-bit I/O space. This block must begin on a

64-byte address boundary. The first address in the block —

the “base address” — is assigned by option shunts A6-A15.

Care must be exercised to ensure that no other

devices use addresses in the block assigned to the

425. Use the tables shown below to determine

the proper settings for your application.

For example, to program the board

base address to 0300 hex, install

shunts A15-A10 and A7-A6, and

remove shunts A9-A8.

Note: default settings (address 0C80) in bold

Second Address Nibble

Adrs A11 A10 A9 A8

0 On On On On

1 On On On Off

2 On On Off On

3 On On Off Off

4 On Off On On

5 On Off On Off

6 On Off Off On

7 On Off Off Off

8 Off On On On

9 Off On On Off

A Off On Off On

B Off On Off Off

C Off Off On On

D Off Off On Off

E Off Off Off On

F Off Off Off Off

Third Address Nibble

Adrs A7 A6

0 On On

4 On Off

8 Off On

C Off Off

Several onboard subsystems are capable of

generating interrupt service requests to the host

processor. All three encoder counters as well as relay

channels 0-15 may source such requests.

To compensate for the limited interrupt resources in

ISAbus systems, the 425 board is restricted to a

single physical interrupt request signal for all

onboard interrupt sources.

For maximum flexibility, the board’s interrupt

request may be assigned to any available IRQ line on

the ISAbus. When choosing an interrupt level for the

425 board, verify that no other boards are using the

same level.

If the 425 board will not be sourcing interrupt requests,

be sure that no option shunts are installed in any of the

IRQ positions.

If you will be using the 425

board to generate interrupts,

you must install an option shunt

to assign an interrupt level to

the board. Install a shunt at the

position corresponding to the

desired interrupt service level

per the table to the right. Make

sure that only one interrupt

level is selected.

IRQ Position

3 IRQ3

4 IRQ4

5 IRQ5

6 IRQ6

7 IRQ7

9 IRQ9

10 IRQ10

11 IRQ11

12 IRQ12

14 IRQ14

15 IRQ15

Assigning an Interrupt Level

1 2 3 4 5 6 7 8 9 10 ... 33 34

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