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CHAPTER:1.
GENERAL INFORMATION
1.1. Introduction
PCLD-788
Relay Multiplexer
Board is a daughter
board controlled
by
the digital output port of PCL-711,
PCL-718,
PCL-812
and other data
acquisition
card with
digital output
port.
The PCLD-788
can multiplex
sixteen
analog inputs to one output and
can be cascaded
up to 16 boards
and 256 channels.
The multiplexer
has break-before-make
mechanism
which
makes
two
channels
never short together.
This board also offers channel-close
signal
for measurement
devices to make
correct
measurement.
PCLD-788
also contains
cold junction sensing circuit and allows the
measurement
of thermocouple
transducer.
All types of thermocouple
can be handled
with
software
compensation
and linearization.
1.2. Product
Features
Asummary
of PCLD-788
features are as follow :
*
16 channel
input and 1 channel
output
*
Break-before-make
switching
(3 milliseconds
between
opening
and closing)
*
Channel-close
signal
output
*
Cold junction
temperature
output
*
Expandable
to 256 input channels
maximum
*
Using PC power or external
power selectable
*
Input voltage isolation withstand
100V DC maximum
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