Device Dependent Status Bit (Ddsb) - Racal Instruments 2251A Operator's Manual

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)
b)
c)
d)
DDSB assertion is qualified by the use of the command codes Q0 to Q7.
DDSB generation inhibited
DDSB generation upon error detected
DDSB generation for measurement ready
DDSB generation for measurement ready or error detected
DDSB generation for frequency standard change
DDSB generation for frequency standard change or error detection
DDSB generation for measurement ready or frequency standard change
DDSB generation for measurement ready, frequency standard
change, or error detected
NOTES: 1.
2.
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Measurement cycle completed
Frequency standard changed to external
Error condition detected
Any combination of the above
NOTE
Table 3.17 - STA Related "Q" Codes
Function
An DDSB is not asserted for recalled data.
Frequency Standard change will cause the DDSB to be set if reference is
changed from internal to external or external to internal.
Code
Q0
Q1
Q2
Q3
Q4
Q5
Q6
Q7
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