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3.1
Operation
Maintaining signal connections is one of the most important factors in ensuring that
your application system is sending and receiving data correctly. A good signal con-
nection can avoid unnecessary and costly damage to your PC and other hardware
devices. This chapter provides useful information about how to connect input and
output signals to the PCI-1750 via the I/O connector.
3.2
Isolated Digital I/O Ports
3.2.1
Introduction
The PCI-1750 has 16 isolated digital input channels designated IDI 0 ~ IDI 15, and 16
isolated digital output channels designated IDO 0 ~ IDO 15. Data can be read from or
written to the card's channels.
3.2.2
Interrupt function of the DIO signals
Two I/O channels (IDI 0 and IDI 8) can be used to generate hard ware interrupts. A
user can program the interrupt control register [Base + (32Dec)] to select the interrupt
sources. Refer to Section "Interrupt Function" for details about interrupt control.
3.2.3
Power On Configuration
The default configuration after power on, hardware reset or software reset is to set all
the isolated output channels to low so that users need not worry about damaging
external devices during system start up or reset.
PCI-1750 User Manual
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