參數(shù)資料
型號(hào)： PCPIC
英文描述： PC(ISA)BUS I/O CARD
中文描述： 電腦（ISA）總線的I / O卡
文件頁數(shù)： 6/40頁
文件大?。?/td> 468K
代理商： PCPIC
2192-09155-000-000
J230 PCPIC
Page 6
known frequency from the timebase is counted, so times can be
measured.
The counter gates determine whether the counters can count or not.
In some cases - for example free-running counters - they can be
permanently open. In other cases - for example measuring the time
between two signals - the gates must be opened by one signal and
closed by another. To cope with this case, the PCPIC has eight
latches which can be set and reset by pairs of signals.
As can be seen, a fair amount of 'rewiring' is necessary to configure
the PCPIC to perform these different functions. This is all achieved
by setting up bits in a register on board and changing the mode of
operation of the counters.
The PCPIC can also be used for digital I/O. One group of eight lines
on the connector can be read directly as inputs. Another group can
also be read as inputs but is connected to the counter outputs; since
these are open collector the lines can be used as general-purpose
inputs if the counter outputs are disabled. In addition, these eight
lines can be used as interrupt inputs, so interrupts from either the
counter outputs or the external inputs can be generated. A third
group of lines acts as outputs - they are also used to reset the input
latches if necessary.
Interrupts may be generated on three different conditions and may
be fed to the PC's IRQ2, 3, 4, 5 and 7 interrupt lines. These conditions
are that either any one or more inputs are high, or that any one or
more inputs are low, or that all inputs are low. Interrupts can also be
disabled. Any of the interrupt generating conditions or the interrupt
disable condition, may be selected by software.
A 50-way D-type connector is used to connect to the PCPIC. This
allows a ribbon-cable to connect to individual cable connectors or to
other boards which either modify the signal in some way or contain
other types of connectors. These are called signal-conditioning
boards.
Using Signal-Conditioning Boards
In an industrial environment there are many signals which it is
unsafe to let into your PC. Examples are signals at high voltage such
as mains, or signals with a lot of superimposed noise. This latter
category includes most signals that exist in a factory. Another
potential problem is that the PC may not be able to supply enough
power to drive some equipment directly. Also the signals may be on
cables which cannot be physically connected to the PC because they
are just too big and cumbersome.
The Arcom signal-conditioning system was designed to solve these
problems. In essence the idea is extremely simple. All Arcom digital
I/O boards have a standardised connection to a 50-way ribbon
cable. TTL-level signals (together with +5V, +12V and -12V) are used
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