Measurement-computing Analyzer488 Manuale Utente Scaricare il pdf (Pagina 156)

Section 4 Serial Controller

4.62

RELATIVE

The

RELATIVE

command enables or disables the Relative Addressing Format

for use in referencing data in the record memory.

RELATIVE ON

puts the

Analyzer488 in the Relative Addressing Format.

RELATIVE OFF

puts the

Analyzer488 in the Absolute Addressing Format.

The query option,

RELATIVE?,

returns

RELATIVE ON

if Relative Addressing

Format is enabled or

RELATIVE OFF

if Absolute Addressing Format is enabled.

TYPE Record command

SYNTAX

RELATIVE{[?]|[ON|OFF]}

RESPONSE None

REMARKS Relative addressing is used to allow easier referencing of bus data

in the record memory. For example, assume bus events have been

recorded and the trigger point is at location 24356. To see the bus

event that occurred 24 locations before the trigger point, you would

need to subtract 24 from 24356 and use this new address (24332)

for the desired location. An simpler approach would be to use

relative addressing and set the relative address to the address of the

trigger point. To do this, set the relative address to 24356 by

issuing the

SET RELATIVE 24356

command. Enable relative

addressing by using the

RELATIVE ON

command. To specify the

same location as before, use -24 as the address rather than 24332.

When addresses are printed using the

VIEW

commands,

the relative addresses (not the physical addresses) are printed. For

this example, the printed address of the trigger point would be

00000 if Relative Addressing Format is enabled.

MODE Any

BUS STATES None

QUERY Returns

RELATIVE ON

if Relative Addressing is enabled or

RESPONSE

RELATIVE OFF

if Absolute Addressing is enabled.

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Measurement-computing Analyzer488 Manuale Utente Pagina 156

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