Specifications

5-3
System Command Reference Section
Pattern Configuration
Note that if a user pattern is selected and the [:SELECT]? command is used, then the
response is “UPAT”. The particular value of <n>, indicating the NV-RAM or disk store
from which the pattern originated, is not present.
The *RST selection is PRBS23.
[SOURce[1]:]PATTern:ZSUBstitut[:ZRUN] <numeric value>
This is a contraction of the phrase: Zero RUN, and is the length, in bits, of the longest run
of zeros in the pattern. The zeros that are added for the Zero Substitution function replace
the bits that immediately follow this longest run of zeros and the length of the overall
block of zeros is the value set by the ZRUN command. The range of values is:
MINimum The length of the longest run of zeros in the unmodified pattern.
(eg for a pattern this value is 7.)
MAXimum The length of the pattern minus one.
The *RST selection is 13.
[SOURce[1]:]PATTern:MDENsity [:DENSity] <numeric value>
Sets the density of marks in the output pattern. The mark density may be varied in eighths,
from one to seven eighths, (but excluding three eighths and five eighths).
The *RST selection is four eighths.
[SOURce[1]:]PATTern:UPATtern<n> [:LENGth] <numeric value>
This command sets the length of the pattern that is to be generated. When an alternate
user-defined pattern is selected, the :LENGth refers to each half of the pattern. The pattern
length has the following constraints:
1. 1 bit to 32 kbits in 1-bit steps,
2. 32 kbits to 64 kbits in 2-bit steps,
3. 64 kbits to 128 kbits in 4-bit steps,
4. 128 kbits to 256 kbits in 8-bit steps,
5. 256 kbits to 512 kbits in 16-bit steps,
6. 512 kbits to 1 Mbits in 32-bit steps,
7. 1 Mbit to 2 Mbits in 64-bit steps,
8. 2 Mbits to 4 Mbits in 128-bit steps,
9. 4 Mbits to 8 Mbits in 256-bit steps
The *RST command leaves this selection unchanged.
NOTE Accessing large patterns can take several minutes. Control programs
must be prepared for I/O time outs of this order.