visastatus
Description
Examples
Check VISA Resource Status
Create a connection to an oscilloscope using the VISA-GPIB interface.
v = visadev("GPIB0::11::INSTR");
Configure the oscilloscope to request service when a command error occurs.
writeline(v,"*CLS"); writeline(v,"*PSC 0"); writeline(v,"*ESE 0"); writeline(v,"DESE 0"); writeline(v,"*SRE 32");
Send the "Volt?"
query to the oscilloscope. Since it is an
invalid command, a command error occurs.
writeline(v,"Volt?");
Check whether the oscilloscope has requested service.
visastatus(v)
ans = logical 1
Since a command error occurs when you send the "Volt?"
command,
the oscilloscope has requested service.
Input Arguments
v
— VISA resource
visadev
object
VISA resource, specified as a visadev
object.
Example: visastatus(v)
checks the status of the VISA resource
service request.
Output Arguments
tf
— True or false result
1
| 0
True or false result, returned as a 1
or 0
of
data type logical
.
Data Types: logical
status
— Status byte register
double | 0 to 255
Status byte register, returned as a positive integer from 0 to 255. You can convert
this value to its binary value using dec2bin
and interpret each bit
as information about the VISA resource.
Each bit is associated with a type of event. For example, bit 6 (RQS) indicates the status of the VISA resource service request.
Status Byte Register Bits
Bit | Label | Description |
---|---|---|
0-3 | – | Instrument-specific summary messages. |
4 | MAV | The Message Available bit indicates if data is available in the Output Queue. MAV is 1 if the Output Queue contains data. MAV is 0 if the Output Queue is empty. |
5 | ESB | The Event Status bit indicates if one or more enabled events have occurred. ESB is 1 if an enabled event occurs. ESB is 0 if no enabled events occur. You enable events with the Standard Event Status Enable Register. |
6 | MSS | The Master Summary Status summarizes
the ESB and MAV bits. MSS is 1 if either MAV or ESB is 1. MSS is 0 if both
MAV and ESB are 0. This bit is obtained from the |
RQS | The Request Service bit indicates that the instrument requests service. This bit can be used for serial polling. | |
7 | – | Instrument-specific summary message. |
Data Types: double
Version History
Introduced in R2021a
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