Device Features

Overall Features:

96 TTL digital I/O lines

Emulates mode 0 of 8255 PPI

Buffered circuits for higher driving capacity than 8255

Multiple-source interrupt handling

Output status read-back

“Pattern match" and “Change of state" interrupt functions for critical I/O monitoring

Keeps I/O setting and digital output values when hot system reset

Supports dry contact and wet contact

50-pin pin header
BoardID switch

Applications:

Industrial AC/DC I/O devices monitoring and controlling

Relay and switch monitoring and controlling

Parallel data transfer

TTL, DTL and CMOS logic signal sensing

Indicator LED driving

Interrupt Function:

Two lines of each I/O port C, plus ports A0 and B0, are connected to the interrupt circuitry. The “Interrupt Control Register?of the PCM-3753I controls how the combination of these signals generates an interrupt. Six interrupt request signals can be generated at the same time, and then the software can service these six request signals by IRQ. The multiple interrupt sources provide the card with more capability and flexibility.

DI change status Interrupt

The PCM-3753I also provides the change of state interrupt function for port B0. It monitors the status of the enabled channels of port B0. When one of the enabled channels changes its state, the PCM-3753I delivers an interrupt signal to the system to handle this event.

DI pattern match Interrupt

The PCM-3753I provides the pattern match interrupt function for port A0. It monitors the status of the enabled input channels. This event is generated while the predefined pattern value on Fast DI is present. When the actual state values match the pre-set state values, the PCM-3753I will deliver an interrupt signal to the system.