Measurement-computing CIO-DAS08 Instrukcja Użytkownika Pobierz pdf (Strona 11)

CIO-DAS08 User's Guide Installing the CIO-DAS08

Interrupt level

Set the interrupt jumper only if your software requires it. If you do set the interrupt jumper, check your PC's

current configuration for interrupt conflicts. Do not use IR2 in PC/AT class machines (or higher).

Use the jumper block labeled

INT above the PC bus interface (gold pins) to set the interrupt. The board is

shipped with the jumper in the "X" position, which means that no interrupt level is set ( ). Figure 3

Figure 3. Interrupt level select jumper (no interrupt level set)

INT

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

another position. The CIO-DAS08 can use interrupt levels 2 through 7. Refer to the following table for some

typical interrupt assignments on a computer. The levels most often available are 5 and 7.

Hardware interrupt assignments

Name Description Name Description

NMI Parity IRQ8 Real Time Clock (AT)

IRQ0 Timer IRQ9 RE-directed to IRQ2

(AT)

IRQ1 Keyboard IRQ10 Unassigned

IRQ2 Reserved (XT) IRQ11 Unassigned

INT 8-15 (AT)

IRQ3 COM OR SDLC IRQ12 Unassigned

IRQ4 COM OR SDLC IRQ13 80287 MUNERIC CO-P

IRQ5 Hard Disk (XT) IRQ14 Hard Disk

LPT (AT)

IRQ6 Floppy Disk IRQ15 Unassigned

IRQ7 LPT

Note: IRQ8-15 are AT only

Clock source

With revision 4 and higher hardware, you can use the on-board pacer clock to trigger A/D conversions by

setting the clock source jumper (labeled

J on the board) to the 6/24 position. This setting routes the pacer output

(pin 6) to the interrupt input (pin 24). By default, this jumper is configured as not connected (NC). Refer to

. Figure 4

Figure 4. Clock source jumper (default setting)

Note

: to pace conversions with the on-board pacer, you must also select a hardware interrupt by configuring the

interrupt level select jumper (discussed above).

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 20 21

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Measurement-computing CIO-DAS08 Instrukcja Użytkownika Strona 11