Pendulum CNT-91R Programmer's Handbook

SRQ is true. If you read the status byte us
-
ing *STB?, bit 6 represents MSS. MSS re
-
mains true until all event registers are
cleared and all queues are empty.
Setting up the Counter to
Report Status
Include the following steps in your pro
-
gram when you want to use the status re
-
porting feature.
–
*CLS Clears all event registers and the er
-
ror queue
–
*ESE <bit mask> Selects what condi
-
tions in the Standard Event Status register
should be reported in bit 5 of the status
byte
–
:STATus:OPERation:ENABle <bit
mask> Selects which conditions in the
Operation Status register should be re-
ported in bit 7 of the status byte
– :STATus:QUEStionable:ENABle
<bit mask> Selects which conditions in
the Questionable Status register should be
reported in bit 3 of the status byte
–
:STATus:DREGister0:ENABle
<bit mask> Selects which conditions
in Device Register 0 should be reported in
bit 0 of the status byte
–
*SRE <bit mask> Selects which bits
in the status byte should cause a Service
Request
A programming example using status re
-
porting is available in Chapter 7.
Reading and Clearing Status
n
Status Byte
As explained earlier, you can read the
status byte register in two ways:
Using the Serial Poll (IEEE-488.1 de
-
fined).
–
Response:
–
Bit 6: RQS message, shows that the
counter has requested service via the
SRQ signal.
–
Other bits show their summary mes
-
sages
–
A serial poll sets the RQS bit
FALSE, but does not change other
bits.
Using the Common Query *STB?
–
Response:
–
Bit 6: MSS message, shows that
there is a reason for service request.
–
Other bits show their summary mes-
sages.
–
Reading the response will not alter
the status byte.
n
Status Event Registers
You read the Status Event registers with
the following queries:
–
*ESR? Reads the Standard Event Status
register
–
:STATus:OPERation? Reads the
Operation Status Event register
–
:STATus:QUEStionable? Reads the
Questionable Status Event register
–
:STATus:DREGister0? Reads the
Device Event register
When you read these registers, you will
clear the register you read and the sum
-
mary message bit in the status byte.
6-14 Status Subsystem
Using the Subsystems

Pendulum CNT-91R Specifications

General

Brand	Pendulum
Model	CNT-91R
Category	Measuring Instruments
Language	English