Sensoray 421 Manual do Utilizador descarregar pdf (Página 5)

Sensoray Model 421 Instruction Manual Page 3

Selecting a Base Address

First Address Nibble (MSB)

Adrs S1-15 S1-14 S1-13 S1-12

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

Fault Indicator

Status Register

A status register, located at the board base address

+ 11, makes available four status bits for access by

the ISAbus host processor. The status register is

organized as follows:

STATUS (11):

Status bits are all active high and have the

following definitions:

UN — indicates A/D converter is programmed for

unipolar operation.

BZ — indicates that the A/D converter is busy

digitizing an analog input.

DE — indicates that all four DAC output channels

have been enabled via the CHCTRL port.

PD — indicates 421 is in the low-power standby

mode, controlled by the RELAY2 port.

x x x x UN DE BZ FT

A red light-emitting diode located near the upper-

left corner of the circuit board indicates reset and

fault conditions.

In normal operation, the indicator is turned on only

during system or 421 local reset. The indicator

should be off at all other times.

If the fault indicator remains on for more than one

second following a reset, a fault condition may

exist on the board that requires servicing.

Before servicing the unit, make sure that your

ISAbus host CPU is not invoking repeated soft

resets of the 421 (which will also keep the indicator

turned on).

The 421 board occupies a block of 32 consecutive

addresses in the ISAbus 16-bit I/O space. The address

range occupied by the board must begin on a 32-byte

address boundary. The first address in the block — the

“base address” — is assigned by DIP switches S1 and S2.

Care must be exercised to ensure that no other

devices use addresses in the address range

assigned to the 421. Use the tables shown below

to determine the proper address switch settings

for your application.

For example, to program the board

base address to 03A0 hex, set the

address switches as follows: Turn

on S1 switches10-15 and S2

switch 6. Turn off S1 switches 8

and 9. S2 switches 2 and 4.

Note: default switch settings are shown in bold

Second Address Nibble

Adrs S1-11 S1-10 S1-9 S1-8

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 S2-7 S2-6 S2-5

0 On On On

2 On On Off

4 On Off On

6 On Off Off

8 Off On On

A Off On Off

C Off Off On

E Off Off Off

1 2 3 4 5 6 7 8 9 10 ... 26 27

Comentários a estes Manuais

Sem comentários

Sensoray 421 Manual do Utilizador Página 5

Comentários a estes Manuais

Manuais e produtos relacionados com Hardware Sensoray 421