8-27
IM 704420-01E
Communication Function
8
8.7 Commands
: M E M o r y : E N D ?
: M E M o r y : E N D ?
: M E M o r y : E N D ?
: M E M o r y : E N D ?
: M E M o r y : E N D ?
Function
Queries the end position of the data to be
transmitted.
Syntax
:MEMory:END?
Example
:MEMORY:END?
→
:MEMORY:END 37.0E-9<Time>
Example
You cannot make a query when the
measurement function is set to “
WOBBle
” (BI-
PHASE measurement function option, see the
TA120E Digital Jitter Meter Option Function
User’s Manual (IM704420-51E)).
: M E M o r y : F O R M a t
: M E M o r y : F O R M a t
: M E M o r y : F O R M a t
: M E M o r y : F O R M a t
: M E M o r y : F O R M a t
Function
Sets the format of the data to be transmitted or
queries the current setting.
Syntax
:MEMory:FORMat {ASCii|BINary}
:MEMory:FORMat?
Example
:MEMORY:FORMAT ASCII
:MEMORY:FORMAT?
→
:MEMORY:FORMAT ASCII
: M E M o r y : S E N D ?
: M E M o r y : S E N D ?
: M E M o r y : S E N D ?
: M E M o r y : S E N D ?
: M E M o r y : S E N D ?
Function
Executes the transmission of the measured data
specified by “
MEMory:DATaselect
.”
Syntax
:MEMory:SEND?
Example
:MEMORY:SEND?
→
#800000016abcdabcea
Example
(When the format is ASCII)
• For measured time stamp and measure time
data
<Time>,<Time>.....
• For histogram frequency data
<NR1>,<NR1>.....
(When the format is binary)
#800100000ABCDEFGHIJ
• #8: Indicates that an 8-digit value follows.
• 8-digit value 00100000: Indicates the number
of transmitted data bytes. The number of
transmitted bytes is 10000.
• ABCDEFGHIJ....: Indicates the actual number
of data bytes.
Frequency (FREQuency):
The frequency is stored using a 4-byte unsigned
integer.
Measured data (MEASuredata):
4-byte unsigned integer. The measured value is
derived by multiplying the resolution below.
DtoC, 3T: 312.5 ns
BI-PHASE (option, see the TA120E Digital
Jitter Meter Option Function User’s Manual
(IM704420-51E)): 156.25 ns
Measured time stamp (TSTamp):
4-byte unsigned integer. The time stamp value
is derived by multiplying 160.0 ns to this value.
: M E M o r y : S I Z E ?
: M E M o r y : S I Z E ?
: M E M o r y : S I Z E ?
: M E M o r y : S I Z E ?
: M E M o r y : S I Z E ?
Function
Queries the number of data points that have
been measured.
Syntax
:MEMory:SIZE?
Example
:MEMORY:SIZE?
→
100000
Example
You can make a query only when the
measurement function is set to “
WOBBle
” (BI-
PHASE measurement function option, see the
TA120E Digital Jitter Meter Option Function
User’s Manual (IM704420-51E)).
: M E M o r y : S T A R t ?
: M E M o r y : S T A R t ?
: M E M o r y : S T A R t ?
: M E M o r y : S T A R t ?
: M E M o r y : S T A R t ?
Function
Queries the start position of the data to be
transmitted.
Syntax
:MEMory:STARt?
Example
:MEMORY:START?
→
:MEMORY:START 0.0E-9
<Time>
Example
You cannot make a query when the
measurement function is set to “
WOBBle
” (BI-
PHASE measurement function option, see the
TA120E Digital Jitter Meter Option Function
User’s Manual (IM704420-51E)).
Transmitted Data
The transmitted data varies depending on the
measurement function.
• When the measurement function is set to D-to-C
jitter or 3T jitter
Measured time data and histogram frequency data
• When the measurement function is set to BI-PHASE
(option, see the TA120E Digital Jitter Meter Option
Function User’s Manual (IM704420-51E))
Measured time stamp and measured time data
Transmitted Range
All the data that the TA120E is computing within the
window range are transmitted. The transmitted range
varies depending on the measurement function as
follows:
• When the measurement function is set to DtoCDVD:
0 ns to T (T: the measured clock value when PLL is
OFF, the regenerated clock value when PLL is ON)
• When the measurement function is set to 3TCD
×
1
or 3TCD
×
N:
2.5T to 3.5T(T: 231.385 ns/
×
N speed)
• When the measurement function is set to BI-PHASE
(option, see the TA120E Digital Jitter Meter Option
Function User’s Manual (IM704420-51E)):
Data corresponding to the number of samples
acquired
Note
• Data cannot be transmitted while measurement is in progress.
Data can only be transmitted after the measurement has
finished.
