Specification Sheet

MODEL 201 24-BIT DATA ACQUISITION SYSTEM


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Documentation

User Sample Applications

Developer's Samples w/SourceCode

External A/D Converter Systems

Serial Port Interface

TYPE: Serially interfaced 24-bit delta-sigma (these converters have excellent noise rejection).
MONOTONICITY: 24 bits at up to 50 Hz data rate.
LINEARITY: 0.002% of full scale typical at up to 50 Hz data rate.
DIFFERENTIAL INPUT RANGE: +/- 5 volts or 0 to 5 volts.
DC COMMON MODE RANGE: +/- 6 volts.
DC COMMON MODE REJECTION: -96 dB minimum.
RESOLUTION: 16 or 24 bits, software selectable.
INPUT IMPEDANCE: 100,000 megohms typical.
PROGRAMMABLE GAIN: 1, 2, 4, 8, 16, 32, 64, or 128.
ANALOG INPUTS: 6, fully differential, protected to 60 volts, expandable to 96 channels using optional multiplexers.
DIGITAL INPUTS: 8-bits, contact closure or 5-volt logic compatible.
DIGITAL OUTPUTS: 4 optically isolated lines plus 8 latched logic outputs.
POWER REQUIREMENT: +11.5 to +50 VDC regulated or unregulated .
TYPICAL POWER CONSUMPTION: up to +24 VDC power supply voltage
operation . . . . 18 milliamps
standby . . . . . 14 milliamps
sleep . . . . . . 2 milliamps
add 3 milliamps to each at +50 VDC
SIZE: 5 x 6.5 x 1.2 inches.
SPEED: The Model 201 has a programmable conversion rate which also determines the cut-off frequency of the low-pass filter. Representative values are given below. Effective resolution is 24 bits minus RMS noise in bits. Effective resolution may be reduced at gains above x4.

DATA RATE	10 Hz	30 Hz	100 Hz	300 Hz
CUT-OFF FREQUENCY (-3 dB)	2.6 Hz	7.9 Hz	26 Hz	79 Hz
EFFECTIVE RESOLUTION (BITS)	22	20	19	15
SETTLING TIME (SECONDS)	.4	.13	.04	.013

SERIAL INTERFACE: RS232, optically isolated, full duplex. Programmable from 300 to 9600 Baud. Checksum transmitted on request.
OTHER FEATURES: Also under software control are signal averaging and variable input filtration. The Model 201 can operate in polled or scanning mode. In polled mode, individual readings are transmitted on request. In scanning mode, a pre-defined block of data is transmitted at a preset interval. Sleep mode drastically reduces power.
OPTIONAL EXPANSION CAPABILITY: A stacking expansion board can hold memory, additional A/D or D/A converters, or additional digital input and output.
CUSTOM MODIFICATIONS: The Model 201 can be custom programmed to perform a wide variety of tasks. If you do not see a particular feature here, call for a quotation. With a combination of custom hardware and software, the Model 201 can be optimized for process control, remote data logging, chromatography, or other application.
PRICE: $495, driver software and wall-mount transformer included. Optional rugged steel enclosure, add $60.

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5-Channel stacking analog output board for the Model 201

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Sample applications

Source code
(with sample applications)


OVERVIEW: The Lawson Labs, Inc. Model 201-5 is a stacking expansion card to provide analog output capability for the Model 201 24-bit Data Acquisition System. The digital-to-analog converter (DAC) card is available in two- or five-channel versions. The standard range is 0 to 5 VDC. The first two channels can be set at the factory for +/- 5 or 0 to 10 volts or other custom ranges. Resolution is programmable up to a maximum of 16 bits. The Model 201-5 is intended for DC or very low frequency application.
Because the precision reference on the Model 201 is used to generate the output voltages, long-term output stability is excellent. Voltages are set using the Model 201's expansion output commands. Adding a DAC card will not affect the other functions of the Model 201. The Model 201, itself, does not need to be altered to accept the stacking expansion card.
ANALOG OUTPUT CHANNELS: 2 (Model 201-5-2) or 5 (Model 201-5-5)
OUTPUT VOLTAGE RANGE: Standard: 0 TO 5 Volts
Optional: +/- 5, or 0 TO 10 Volts
other ranges available, consult factory
RESOLUTION: Programmable, up to 1 part in 65536
ACCURACY: 0.1% of Full Scale
(0.03% of Full Scale with software offset correction)
premium low-offset versions available
LINEARITY: 0.01% of full scale at 25 degrees C
RIPPLE: 5 volt range, 1 part in 10,000 resolution
1 milivolt RMS, typical
OUTPUT DRIVE CURRENT: 5 milliamps minimum
TEMPERATURE COEFFICENT: 50 ppm per degree C, typical (premium versions available)
RESPONSE TIME CONSTANT: 0.3 Seconds
CURRENT REQUIREMENT: 5-Channel
     14 Milliamps in sleep mode
     18 Milliamps in operation
     (plus output load currents)
2-Channel
     12 Milliamps in sleep mode
     14 Milliamps in operation
     (plus output load currents)
SIZE: 4.4 x 4.3 x 0.6 inches
WEIGHT: 3 ounces

user manual

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Specs and Usage

The user manual is a compilation of operating instructions and specifications and the place that we always recommend that you look first concerning questions related to the Model201

sample apps and code for developers

Original API ( created prior to 4-7-2005 )

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Code with simplified API ( created after 4-7-2005 )

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About the links

The first link above takes you to a screen with links for many operating system and developer language options. The operating systems include Win3.1, Win98, WinXP, and more. The languages include BASIC, VisualBasic, C/C++, Labview, and CVI. Some of the sample applications and source code that is provided have been available since the beginning of the Model-201 with recent updates being added as newer operating systems and languages were made available

The second link above take you to a screen which describes our newest API for the Model-201. The newest API offers a somewhat simplified interface into the DLL that is used for accessing the Model-201. Sample applications and source code is provided for limited operating systems and languages, but the API can be accessed from many more languages than those that we currently supply sample apps and source code for.

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