VCM-DAS-3 datasheet(33/42 Pages) ETC2

Part #	VCM-DAS-3

Description	The VCM-DAS-3 is a PC/104-format data acquisition board that provides analog outputs and digital I/O for process control and other applications.

PDF	42 Pages

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Manufacturer	ETC2 [List of Unclassifed Manufacturers]

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Analog Output Data Representation

VCM-DAS-3 Reference Manual

OFFSET BINARY CODING

The formulas for calculating analog or straight binary digital values are given by:

Where:

Analog = Applied voltage

Digital

= A/D conversion data

Offset1 = 2048 for symmetrical ranges

1024 for asymmetrical range

Step

= 0.00122070313 for ±2.5V range

0.00244140625 for ±5V and -2.5 to +7.5 ranges

0.0048828125 for ±10V range

Offset2 = 2.5 for ±2.5V and -2.5 to +7.5 ranges

5 for ±5V

10 for ±10V range

Table 20: Offset Binary Data Format – Symmetrical Ranges

±2.5V

Output

Voltage

±5V

Output

Voltage

±10V

Output

Voltage

Hex

Decimal

Comment

+2.5000

+5.0000

+10.0000

–

Out of range

+2.4987

+4.9975

+9.9951

FFFh

4095

Maximum positive voltage

+1.2500

+2.5000

+5.0000

C00h

3072

Positive half scale

+0.6250

+1.2500

+2.5000

A00h

2560

Positive quarter scale

+0.00122

+0.00244

+0.00488

801h

2049

Positive 1 LSB

0.0000

800h

2048

Zero (ground voltage)

0.00122

0.00244

0.00488

7FFh

2047

Negative 1 LSB

0.6250

1.2500

2.5000

600h

1536

Negative quarter scale

1.2500

2.5000

5.0000

400h

1024

Negative half scale

2.5000

5.0000

10.0000

000h

Maximum negative voltage

Digital =

Analog = (Step x Digital) - Offset2

+ Offset1

Analog

Step

VCM-DAS-3 Datasheet(PDF) 33 Page - List of Unclassifed Manufacturers

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