Measurement Computing Analyzer488 - Manual (Page 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 PRINT or 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.