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3-23
3.16
Device Dependent Status Bit (DDSB)
3.16.1
This section describes the 2251A Device Dependent Status command “*STA?” and the
conditions that will set the DDSB (bit 0 of the Status Byte).
3.16.2
2251A SRQ Assertion
The conditions for the 2251A to assert the DDSB (which would have been the SRQ bit
of the old 2251 status byte) are as follows:
a)
Measurement cycle completed
b)
Frequency standard changed to external
c)
Error condition detected
d)
Any combination of the above
NOTE
DDSB assertion is qualified by the use of the command codes Q0 to Q7.
Table 3.17 - STA Related “Q” Codes
Function
Code
DDSB generation inhibited
Q0
DDSB generation upon error detected
Q1
DDSB generation for measurement ready
Q2
DDSB generation for measurement ready or error detected
Q3
DDSB generation for frequency standard change
Q4
DDSB generation for frequency standard change or error detection
Q5
DDSB generation for measurement ready or frequency standard change
Q6
DDSB generation for measurement ready, frequency standard
change, or error detected
Q7
NOTES:
1.
An DDSB is not asserted for recalled data.
2.
Frequency Standard change will cause the DDSB to be set if reference is
changed from internal to external or external to internal.
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Содержание 2251A
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