Manual PCI-DIO-48JP/JPS
9
Chapter 3: Option Selection
Refer to the setup programs on the CD provided with the card. Also, refer to the block diagram on the
previous page and the option selection map on this page when reading this section of the manual.
External Interrupts are accepted on the I/O connector pin 9 (bit C3 group 0) and pin 59 (bit C3 group 1).
The Interrupt signal is a positive edge. 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.)
NOTE A jumper must be installed in either the TST or the BEN position for the card to function.
These are the only manual setups necessary to use either the 48JP or the 48JPS. Input/Output selection
and the change-of-state Interrupt Enable is done via software by writing to a control register in each PPI as
described in the PROGRAMMING section of this manual.
Figure 3-1: Option Selection Map
