ADLINK Technology NuDAQ ACL-8454, Руководство пользователя

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Introduction
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Introduction
The ACL-8454 is a general purpose counter/timer and digital I/O
card.It is a compact-size add-on card for IBM AT compatible PC in
control, monitoring and sensing applications. There are two version
of ACL-8454: ACL-8454/6 and ACL-8454/12. ACL-8454/6 has two
8254 chips (6 counters) on board. ACL-8454/12 has four 8254 chips
(12 counters).
On ACL-8454/6, four counters are used for external signal, two
counters are cascaded as 32-bit timer. On ACL-8454/12, eight
counters are used for external signal, the rest of the four counters
are designed as two 32-bit cascaded counters.
This card has multi -configurations. The counters can be set as
independent counters or cascaded counters. The gate control of
every counter comes from either external source or internal
cascaded counter. The clock source comes from either internal or
external can be selected by jumper setting. A 10 MHz oscillator is
used as the base clock of internal clock sources.
It is possible to use this card on variety of powerful counter/timer
functions to match your industry and laboratory applications. Users
can set the configuration to fit the variety of applications, such as
timer, event counter, frequency generator, pulse width measurement,
and frequency measurement.
The card also provides digital output and input port. There are 8
digital output channels and these channels can be used to control
the external devices. There are digital input channels and these
channels are shared the same signal lines with the external clock