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Manual PCIe-DIO-48S PCI Express Digital I/O Card
6
When a port has COS enabled, any changes of the port's bits (low-to-high or high-to-low) will cause
an interrupt. Refer to Chapter 5: Programming for enabling, disabling, and clearing the interrupts.
Each DIO line is buffered and capable of sourcing 32mA or sinking 64mA. The VCCIO level is 5V or
can be factory configured as 3.3V. Applications sourcing in excess of 1A @ VCCIO = 5V for the DIO
requires the external power option to be factory installed. External power is sourced from the
computer system through an onboard right-angle Molex connector. Any available Molex power
connector from the computer system's power supply can be used. Note: All VCCIO = 3.3V
applications do not require the external power option as the board has sufficient power for this voltage
rail.
By default, the DIO lines are pulled up with 10k
Ω
resistor networks to VCCIO. DIO lines can also be
factory configured as pulled down.
DIO wiring connections are via two 50-pin headers on the side of the board. A cutout on the card’s
mounting bracket allows two flat ribbon cables to exit the computer. These cables can be strain-
relieved using the provided clamping plate and connected to external termination panels. This
provides compatibility with OPTO-22, Gordos, Potter & Brumfield, and other module mounting racks.
Every second conductor of the flat cables is grounded to minimize crosstalk between signals in the
cables. VCCIO is available on each I/O connector (pin 49) for external use, see page 10.
Figure 1-1:
Block Diagram