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Subsystem Syntax
Chapter 3
The
subsystem reports the bit values of the Operation Status Register. It also
STATus
allows you to unmask the bits you want reported from the Standard Event Register
and to read the summary bits from the Status Byte Register.
STATus
:OPERation
:CONDition?
:ENABle <unmask>
:ENABle?
[:EVENt?]
:PRESet
The
STATus
system contains four registers (that is, they reside in a SCPI driver, not
in the hardware), two of which are under IEEE 488.2 control; the Standard Event
Status Register (
*ESE?)
bit (OPR), service request bit (RQS), standard event summary bit (ESB), message
available bit (MAV) and questionable data bit (QUE) in the Status Byte Register
(bits 7, 6, 5, 4 and 3 respectively) can be queried with the
command to query the "unmask" value for the Standard Event Status Register
*ESE?
(the bits you want logically OR'd into the summary bit). The registers are queried
using decimal weighted bit values. The decimal equivalents for bits 0 through 15 are
included in "Figure 3-1. HP E1476A Multplexer Module Status System" on page 82.
A numeric value of 256 executed in a
allows only bit 8 to generate a summary bit. The decimal value for bit 8 is 256.
The decimal values are also used in the inverse manner to determine which bits are
set from the total value returned by an
driver exploits only bit 8 of Operation Status Register. This bit is called the scan
complete bit which is set whenever a scan operation completes. Since completion of
a scan operation is an event in time, you will find that bit 8 will never appear set when
STAT:OPER:COND?
is queried. However, you can find bit 8 set with the
and the Status Byte Register (
STAT:OPER:ENABle <unmask>
EVENt
or
HP E1476A Switchbox Command Reference
STATus
). The operational status
*STB?
command. Use the
*STB?
CONDition
query. The "SWITCH"
command
81
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