Measurement-computing CIO-DAS08-AOH Manuel d'utilisateur télécharger pdf (Page 7)

3.2 INTERRUPT LEVEL SELECT

The interrupt jumper need only be set if the software you are using

requires it. If you do set the interrupt jumper, please check your PC's

current configuration for interrupt conflicts, and do not use IR2 in

PC/AT class machines (or higher).

There is a jumper block on the CIO-DAS08-AOx located just above the

PC bus interface (gold pins). The factory default setting is that no

interrupt level is set. The jumper is in the 'X' position.

Figure 3-2. Interrupt Jumper Block

If you need to pace conversions through hardware (either the on - board pacer or an external clock), move this jumper to one

of the other positions (see table 3-2).

The following table shows some typical interrupt assignments on a PC. The CIO-DAS08-AOx may be configured for

interrupt levels 2 through 7. The levels most often available are 5 and 7.

Table 3-2. Interrupt Assignments

Note: IRQ8-15 are AT onlyLPTIRQ7

UNASSIGNEDIRQ15FLOPPY DISKIRQ6

HARD DISKIRQ14HARD DISK (XT)

LPT (AT)

IRQ5

80287 NUMERIC CO-PIRQ13COM OR SDLCIRQ4

UNASSIGNEDIRQ12COM OR SDLCIRQ3

UNASSIGNEDIRQ11RESERVED (XT)

INT 8-15 (AT)

IRQ2

UNASSIGNEDIRQ10KEYBOARDIRQ1

RE-DIRECTED TO IRQ2

(AT)

IRQ9TIMERIRQ0

REAL TIME CLOCK (AT)IRQ8PARITYNMI

DESCRIPTIONNAMEDESCRIPTIONNAME

3.3 XTAL/PC BUS CLOCK JUMPER

The A/D pacer clock sources for the MetraByte DAS-8PGA and DAS-8 are different. The source for the DAS-8PGA is fixed

at 1 MHz while the source for the DAS-8 is dependent on PC bus speed. The CIO-DAS08-AOx attempts to deal with these

differences in a way that satisfies software written for either board.

The CIO-DAS08-AOx is equipped with a jumper which allows you to

choose the source of the A/D pacer clock pulse (Figure 3-3). The default

for this jumper is the 1 MHz position.

The MetraByte DAS-8PGA is only available with a 1MHz XTAL as the

source for the A/D pacer clock. This created problems for users who

wanted to use the DAS-8PGA in place of the DAS-8and use existing

software because the DAS-8 gets its A/D pacer clock pulse from the PC

Bus Clock.

Figure 3-3. Clock Source Jumper

If you need compatibility with the DAS-8 pacing scheme, you can select the PC Bus Clock as the source for the A/D pacer

clock.

1 2 3 4 5 6 7 8 9 10 11 12 ... 31 32

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