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SECTION4

IEEE-488 Reference

and G7 Header (6 bytes) :

Data Forma! :

0000000 = CounisfExponeti

OWOOOl = IEEE Bid 754

I-

Byte Order :

0 = Nond (Motomla)

1 = rieversec (Intel)

and G6 Header (6 bytes) :

MSB LSB

L7--l -

Function :

Byte-Count”

000001 = current

(1 &bit unsigned)

000011 = “,I Ohms

Reserved

- 1 = REL enabled

-Byte Order :

0 = Nom4 (Motorola)

1 = Revemed (Intel)

F&on :

000001 = cument

000011 = vi, Ohms

Reserved

-1 = REL enabled

The ASCII dataformat is ina directreadable form fortheoperator. Most BASIC languageswill

eady convert ASCII mantissa and exponent to other formats. However, some speed is cornpro-

mised to accommodate the conversion.

The Count and Exponent format has some advantages over the ASCII format. It require fewer

bytes, transfers to the computer faster, and is compatible with most programming languages.

This format is particularly useful when collecting data on a fixed range (autorange disabled).

The IEEE Standard 754 Single Precision format requires few bytes, and is used without conver-

sion in popular personal computer programming languages.

4-13

Keithley 486 User Manual

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