Input Commands (Listener); Introduction - Racal Instruments 1994 Service Manual

Table
4.7
- Status
Byte
Format
(Cont'd)
DIO
Line
Function
NOTE
1:
The
error
codes and numbers
are
as follows:
1
= Phase
measurement attempted
on
waveforms
of differing frequency
(Ratio 1
1)
2
=
Result out-of-range of display
>
See
NOTE
3
3
=
Overflow
of
internal counters
4
= Numerical
entry
error
5
=
GPIB
syntax (programming)
error
J
No
measurement
output
string
is
available
if
error
codes
1, 2,
or 3
is
produced.
NOTE
2:
Regardless of the current
SRQ
mode,
the
SRQ
message
that a reading
is
ready
is
not generated
after
a data-
recall operation.
NOTE
3:
The
five
error codes
are cleared as
follows:
Error
1
-
correct
the difference
in
input freauencies
or
change
the
measurement mode
Error
2
-
complete
an
in-ranere
measurement
Error 3 -
complete an
in-ranee
measurement
Error
4
-
complete a
valid
numerical
entrv
Error
5
-
the erroneous
command
strine
will
be
correctly executed up
to
the
error; the rest
will
be handshaken,
but not executed.
Receipt
of the next
valid
command
clears
the error
4.10
INPUT
COMMANDS
(LISTENER)
4.10.1
Introduction
4.10.1.1 The 1994
responds
to
device-dependent
commands
in
a "deferred"
mode.
This
means
that the
GPIB
interface continues
to
accept
commands
until a terminating
character
or
message
is
received,
then
the entire string
will
be executed.
There
is
no
"immediate" mode
in
which
commands
are
obeyed
as
they are received.
4-28