Measurement Computing CIO-DAS08 - Manual (Page 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
2 3 4 5 6 7 X
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)
6 24 NC
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).
11