HP 54501A Programming Reference Manual page 117

*STB
Table
5-5.
The Status Byte Register
Bit
7
6
5
4
3
2
1
0
0
=
False
1
=
True
Bit
Weight
128
64
32
16
8
4
2
1
Bit
Name
...
ROS/MSS
ESB
MAV
LTP
MSG
LCL
TRG
0
=
0
=
1
=
0
=
1
=
0
=
1
=
0=
1
=
0
=
1
=
0
=
1
=
0
=
1
=
=
Low
=High
Condition
not
used
instrument has
no reason
for
service
instrument
is
requesting service
no event
status conditions have occurred
an enabled event status condition
has occurred
no output messages are
ready
an output message
is
ready
no limit
test has
failed
limit
test has
failed
no
message has
been displayed
message has been displayed
a
remote-to-local transition has
not occurred
a
remote-to-local transition
has occurred
no trigger
has occurred
a
trigger
has occurred
Common Commands
5-22
HP 54501A
Programming