Amplicon Liveline PC27E, Инструкция по эксплуатации

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PC27E Page 5
PC27E 16 CHANNEL 12 BIT DATA ACQUISITION BOARD
1. General Information
1.1 General Description
The PC27E is a half sized plug in board which provides 16 channels of 12 bit, high speed
analog to digital conversion. Integral sample and hold circuitry ensures stability during
the conversion process. The PC27E board can be installed in the IBM PC/XT/AT, PS2
Model 30 and compatible computers.
The flexible addressing system provided on the board allows the base address to be set
within the range 000 to FF0 (hex). A comprehensive hardware facility allows selection of
the interrupt levels IRQ2 to IRQ7 by jumpers.
A 4MHz on-board oscillator provides an accurate source for the counter/timers,
independent of the computer system clock frequency. The counter/timers can also be
jumper configured to provide a frequency counter or events counter.
Conversion can be initiated in 3 different ways: the counter/timer circuit can generate a
precisely defined hardware interrupt conversion, a conversion can be directly initiated
from an application program through software control, or an external TTL compatible
signal can directly trigger a conversion. The end of conversion can be programmed to
provide a hardware interrupt to the host system.
1.2 Features
• 16 input channels.
• 12 bit high speed A/D converter with integral sample and hold.
• 10 µs total conversion time, typical.
• 3 modes of converter triggering.
• 3 independently programmable counter/timers.
• On-board 4MHz oscillator.
• Frequency counter function.
• Flexible addressing and interrupt selection.
• Wait state generation for compatibility with faster I/O bus speeds (optional).