ADLINK ACL-8454/12 - Manual (Page 9)

Introduction • 1
1
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.