Omega Products D1000 User Manual
Complete Sensor
To RS-232C or RS-485
Interface
Input Modules for
Thermocouples, RTDs,
Voltages, Currents, Pulse
and Frequency, and
Bridge Inputs
Isolated Inputs
RS-485 Format Permits
Remote Communications
Up to Four Thousand Feet
D2000 Series Provide
Linearization of
Non-Standard Sensors
Connect Up To 32
Modules On One Cable,
Up to 124 Using a
Repeater
Alarm Outputs Standard
Continuous Self
Calibration, No Adjustment
Requirements
The D1000 and D2000 Series digital
transmitters are a complete family of
easy to use interface modules for
personal computers and other
processor based equipment with
standard serial I/O ports. The modules
convert analog input signals to
engineering units and transmit, in
ASCII format, to any host computer
with a standard RS-232C or RS-485
port. This modular design enables
anyone familiar with a personal
computer to construct a flexible and
cost effective data acquisition system.
These modules can measure
temperature, pressure, flow, voltages,
currents and various types of digital
signals. The D1000 series provide
direct interface to a wide variety of
sensors and perform all signal
conditioning, scaling, linearization
and conversion to engineering units.
Each module also provides digital I/O
lines for controlling devices through
solid state relays or TTL signals. These
digital I/O lines along with integral
limit setting capability provide alarm
and control outputs. With the exception
of the D1400 RTD and D1500 bridge
modules, every D1000 module
contains an on-board event counter.
The event counter will count up to
ten million transitions on the digital
input line. All user selectable options
(address, baud rate, alarms, etc.) are
done through the communications
port and stored in nonvolatile memory
thereby eliminating switches or
external adjustments of any kind.
The flexibility of this system allows
users to mix and match the modules
to fit their exact requirements. As
many as 124 modules can be
connected on one 4 wire cable.
They can be placed remote from the
host computer and from each other.
The D2000 series of userprogrammable data acquisition
and control modules allow direct
interface of non-linear analog
sensors to computers with serial
I/O ports.
C-79
D1000 and D2000 OMEGABUS
®
Digital Transmitters
$
250
Basic Unit
C
Use of these modules enables
downloading up to 23 breakpoints
through the communications port.
With these breakpoints the user can
program a module to virtually any
transfer function.
The ability to provide an arbitrary
user programmable nonlinear
transfer function is the most
powerful feature of the D2000
series. Use this feature to linearize
non-standard sensors or to provide
outputs in engineering units, which
are nonlinear to the input. The
D2000 series can be programmed
to approximate square law, root,
log, high-order polynominal or any
other non-linear function.
The D2000 may also be empirically
field-programmed when the exact
transfer function is unknown.
If transmitting long distances is
required, selection of the RS-485
communications format is
encouraged. This permits remote
operation of up to four thousand
feet from the host computer. For
computers which do not include
a RS-485 port, OMEGA offers the
A1000 RS-232C signal converter.
The modules are also capable of
operating in a multidrop fashion
supporting up to 32 units one one
cable set. The A1000 may also be
used as a repeater to allow as many
as 124 modules to be joined
together. A utility software package
(for IBM PC or compatibles) is also
available. This software eliminates
the need for programming skills to
easily communicate with the
modules. This software package is
available upon request at no
charge. Request model D1000-SW,
for D1000, D2000, D3000 and
D4000 models. (One per order).
All modules are supplied with screw
terminal plug connectors and
captive mounting hardware. Their
encapsulated design allows for
mounting in virtually any location
including explosion proof housings
and DIN rails.
A/OUT
SERIAL I/O
C-80
D1000 and D2000 Modules are Easily Arranged in Multidrop Fashion for Multiple Inputs
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