Bit Definitions; Poll - HP 54501A Programming Reference Manual

Bit
Definitions
MAY
•
message
available. Indicates whether there
is
a
response in the
output queue.
ESB
•
event status
bit
Indicates
if
any
of the conditions in the Standard
Event
Status Register are
set
and enabled.
MSS
•
master summary status. Indicates whether the device has
a reason
for requesting service. This bit is returned for the *STB? query.
RQS
•
request service. Indicates
if
the device
is requesting
service.
This
bit
is
returned during
a
serial poll.
RQS will
be
set
to
0
after being read via
a
serial
poll (MSS
is
not reset
by -STB?).
MSG
-
Message. Indicates whether there
is
a
message in the message
queue.
PON
•
power
on.
Always 0 in the HP
54501A.
URQ
-
user request. Indicates whether
a
front panel key
has
been
pressed.
CME
-
command error.
Indicates whether the parser detected an
error.
EXE
•
execution error. Indicates whether
a
parameter was out
of
range, or
inconsistent
with current
settings.
DDE
•
device
specific
error.
Indicates
whether the
device
was
unable to
complete an operation for device dependent reasons.
QYE
-
query error. Indicates whether the protocol for queries
has been
violated.
RQC
•
request control. Indicates whether the device
is
requesting control.
The
HP 54501A will never
request control.
OPC
-
operation
complete. Indicates
whether the
device has completed
all
pending operations.
LCL
-
local. Indicates whether
a
remote to
local transition has
occurred.
Message Communication and System Functions
HP 54501A
3-30
Programming