Model 8901B
READ DATA
FROM
89018
-
Operation
START 89018
(-4
I
SET TRIQGER
MODE TO HOLD
I
(T1)
I
ENABLE
SRO
ON
DATA READY
(22.3SP)
I
CONF
I
QURE
I
MEASUREMENT
A
TRIGGER MEASUREMENT
(T2, T3, GET
OR
I
CLEAR KEY)
I
4l
PROCESS OTHER
TEST OTHER 89018
4No
1
SRO
CONDITIONS
I
READ DATA
FROM
89018
I
1
I
1
RETURN
FROM
INTERRUPT
Figure
3-3.
Example
Flowchart
Using
the Service Request Message.
Using the Service Request Message.
The Service Request message can be used
for
detecting
instrument conditions and instrument
or
HP-IB code errors.
The Service Request Message can also be used
for
signaling measurement
data
ready. Remote
measurements are usually performed simply by triggering measurements, then reading the output
data.
In certain applications, the controller must control other instruments while the
HP
8901B
is
making a
measurement. Using the instrument’s ability to issue the Service Request message when
data
is
ready,
frees the controller to process other routines until the Modulation Analyzer is ready with
data.
See Figure
3-3,
“Example Flowchart Using the Service Request Messagen
for
an example
of
using the
SRQ
message
to
signal the controller that the
HP
8901B
has
completed
its
measurement and the
data
is
ready.
3-27
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