Page 3-1
Manual 00650-529-1
Chapter 3: Option Selection
Refer to the setup programs on the CD provided with the card. Also, refer to Figure 1-1,
PCI-DIO48(S) Block Diagram and Figure 3-1, PCI-DIO48(S) Option Selection Map when reading
this section of the manual.
External Interrupts are accepted on the I/O connector pin 9 (bit C3) for each group. The Interrupt
signal is positive true. External Interrupts are enabled if the IEN0 (for Group 0) and IEN1 (for
Group 1) jumper is installed. Interrupts are directed to an available IRQ level by the system.
A means of enabling or disabling the 74LS245 input/output buffers under program control is
provided at the jumper position labeled TST/BEN. When the jumper is in the BEN (Buffer
Enable) position, the I/O buffers are always enabled. When the jumper is in the TST (Tristate)
position, enabled/disabled state is controlled by a control register. (See the programming section of
this manual for a description.)
An LED, CR1, at the top left of the card to assist you in program development. Each time an
interrupt is generated, the LED will illuminate and remain ON until the interrupt is reset. If there is
an immediate reset of the interrupt, it is likely that the LED will not remain ON long enough to be
observed.
Note
A jumper must be installed in either the TST or the BEN position for the card to function.
The foregoing are the only manual setups necessary to use either the PCI-DIO48(S) or the
PCI-DIO48(S)S Input/Output selection and the change-of-state Interrupt Disable/Enable is done
via software by writing to a control register in each PPI as described in Chapter 6, Programming.
