Device Features

Overall Features:

16 isolated digital input and 16 isolated digital output channels.

High voltage isolation on all channels (2500 VDC)

High sink current on isolated output channels (200 mA/Channel).

D-type 37-pin female connector.

Supports dry contact or 5 to 48 VD C isolated input.

Dual interrupt handling capability

Timer/Counter interrupt capability generates watchdog timer interrupts

Applications:

Digital I/O control.

Industrial ON/OFF control.

Industrial and lab automation.

Switch status sensing

BCD interfacing.

Interrupt Function:

Four input channels (IDI 0, IDI 4, IDI 8 and IDI 12) and the output of Timer 1 and Counter 2 are connected to the interrupt circuitry. The "Interrupt Control Register" of the PCI-1750 controls how the combination of the six signals generates an interrupt. Two interrupt request signals, designated "interrupt group 0" and "interrupt group 1", can be generated at the same time, and then the software can service these two request signals by ISR. IDI 0, IDI 4 and Timer 1 are connected to interrupt port 0, IDI 8, IDI 12 and Counter 2 are connected to interrupt port 1. The dual interrupt sources provide the card with more capability and flexibility.

Timer and Counter:

The PCI-1750 includes one 8254 compatible programmable timer/counter chip which provides three 16-bit counters. Counter0 and Counter1 are cascaded to be a 32-bit timer, with its input connected to a 10 MHz oscillator and its gate control pulled high (enabled). Counter2 of the 8254 chip is a 16-bit high-speed (1 MHz) isolated event counter (it shares a pin with isolated IDI15).