Advantech PC-LabCard PCI-1784 Spécifications télécharger pdf (Page 55)

DI0 latch

A rising edge on the board's DI0 line will latch the counter value for

the channel.

DI1 latch

A rising edge on the DI1 line will latch the counter value for the

channel.

DI2 latch

A rising edge on the board's DI2 line will latch the counter value for

the channel.

DI3 latch

A rising edge on the DI3 line will latch the counter value for the

channel.

Timer latch

The card latches the counter value on a rising edge of pulses from the

card's on-board timer.

D.5 Counter reset value

Bit 4 (RF) of registers BASE+00H, 04H, 08H and 0CH control the

initial (reset) value of for each counter. You can select either 00000000

or 80000000 (hex). When the counter is reset, it will take this value.

When RF＝0, the counter will reset to 80000000h.

When RF＝1, the counter will reset to 00000000h.

D.6 Timer function

The card can generate an interrupt to the system based on a signal from

its digital inputs, overflow/underflow and over-compare / under-

compare of its counters, or on a programmed time interval. It can

repeatedly generate interrupts at any time interval you specify, from 20

microseconds to 51 second. These interrupts let you precisely monitor

the speed of a control system.

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Advantech PC-LabCard PCI-1784 Spécifications Page 55