MODEL 201 24-BIT DATA ACQUISITION SYSTEM                              


Other precision data
acquisition products

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download
Model 201 24-bit Data Acquisition System Product Information Sheet .pdf
Hardware Manual:
.rtf    .pdf    .zip
Graphics Application Software Manual:
.pdf   
User Sample Applications
(no source code included)
Application Guidance
updated 10-26-15
Developer's Samples w/SourceCode
Current  DLLs
NEW:   
Developer's support for BBC Basic
Developer's support for Python
OVERVIEW

The Model 201 was introduced in 1993. Since then, it has found its way into a remarkable variety of demanding applications, including chromatography, thermocouple thermometry, calorimetry, electrochemistry, metrology, electrophoresis, computerized titration, gene sequencing, particle size determination, milk grading, precision scales, 900,000-pound capacity scrap metal weighing systems, annealing oven controls, earthquake monitoring, marine gravity measurement, wind tunnel calibration, oil field monitoring, lighting research, rocket engine test platform instrumentation, and the Large Synoptic Survey Telescope ultra-precision lens temperature measurement system, to name a sampling. The Model 201's flexibility, accuracy and reliability have won it an enduring place in high resolution data acquisition.

Because the Model 201 has enjoyed such a long useful life, there is an abundance of software support available, going back to DOS 3.1. When all the combinations of languages and operating systems are considered, the choices can be daunting. In general, the earliest code is the simplest and clearest, if you are willing to delve into the details. The later code is more in the spirit of Windows where the details are hidden and the functionality is available with a few clicks. Because the Model 201 is a very flexible and generalized device, a particular point-and-click sample application may or may not support the hardware features you wish to use. Contact us if you do not find the particular functionality you are looking for. We may have already done it for someone else, or we may be able to provide it to you at no cost.



SPECIFICATIONS

TYPE
Serially interfaced 24-bit delta-sigma with optical isolation (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 megaohms typical
1013 option available

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 mA
standby 14 mA
sleep  2 mA
add 3 mA to each at +50 VDC

SIZE
5 x 6.5 x 0.8"   board only
5.6 x 7 x 1.8"   in optional enclosure

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) 0.4 0.13 0.04 0.013

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 consumption.

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.

OPTIONS
Lower noise and thermal drift input amplifier option  $25

Custom ID numbers for software protection (contact factory for cost)

 USB to serial converter  $20


  25-Pin Screw Terminal Adapter  $25
   
15-Pin Screw Terminal Adapter  $15


 Contact factory concerning connector orientation options.


 Rugged steel enclosure option  $60


PRICE
$495, serial cable and wall-mount transformer included.

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5-Channel stacking analog output board for the Model 201
 
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Manual
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 °C

RIPPLE
5 volt range, 1 part in 10,000 resolution
1 mV RMS, typical

OUTPUT DRIVE CURRENT
5 mA minimum

TEMPERATURE COEFFICENT
50 ppm per °C, typical (premium versions available)

RESPONSE TIME CONSTANT
0.3 Seconds

CURRENT REQUIREMENT
5-Channel
     14 mA in sleep mode
     18 mA in operation
     (plus output load currents)
2-Channel
     12 mA in sleep mode
     14 mA in operation
     (plus output load currents)
SIZE
4.4 x 4.3 x 0.6 inches

WEIGHT
3 ounces





























































 

user manual
HTML format view online       ( click link to view manual in your browser window ) download archive       ( click link to download manual archive to your PC disk drive )
TEXT format view online       ( click link to view manual in your browser window ) download archive       ( click link to download manual archive to your PC disk drive )
Specs and Usage

We recommend that you look here first concerning questions related to the Model201.





























































 

DLLs  for the Model201
M201_SP.DLL  ( version 10.26.2012.0 ) most work is done within the DLL, decreasing application development work, but also providing slightly less flexibility of use
nt_m201x.DLL  ( version 10.25.2012.0 ) allows for connecting to up to 255 COM ports at same time.
nt_m201.DLL  ( version 4.30.2008.0 ) very early DLL, but with recent updates
About the DLLs

The DLL's available within the downloadable sample applications (both end-user and developer) may not be the most recent. The DLLs linked to here are the most recent, so after downloading a sample app, be sure to replace the DLL that is archived with it with the most recent one  ( with the same name )  linked to abvoe.





























































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