ADLINK ACL-7120A/6 - Manual (Page 7)

Introduction
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Introduction
The ACL-7120A digital I/O and counter/timer card consists of 32 digital input,
32 digital output, and 4 timer/counter channels. All digital input/output
channels are TTL/DTL compatible. The most outstanding feature of the ACL-
7120A is that it is fully hardware and software compatible with both the
ADLINK ACL-7120 and Advantech PCL-720 cards.
The ACL-7120A supports additional daughter boards like the ACLD-9182
and ACLD-9185 cards. The ACLD-9182 is a 16 channel opto-isolated digital
board for inputting digital data to the ACL-7120A when ground isolation is
required. The ACLD-9185 is a 16-channel relay output board that can be
driven by digital outputs from the ACL-7120A.
Up to four programmable interval timers (8254) are provided to add timer and
counter functionalities. To efficiently use the counter, three frequency
sources (10kHz, 100kHz, and 1MHz) are supported for the input of each
counter. In addition, the sources can also be doubled (X2), halved (1/2) or
quartered (1/4) through jumper settings to give more flexibility for different
frequency timer and counter applications.
An optional timer/counter chip is used to support a timer pacer that can
generate periodic interrupts. Also, an event counter can be used for external
event counting.