Time is
coded as four
pairs of digits
for hours (h), minutes
(m), seconds
and
hundredths
of seconds (s) respectively.
hh/mm/ss/ss
To
obtain compressed
ASCII
output, set the DATA
OUTPUT {GPIB}
menu to
either [long
on] or [short
on] and the Talk
Only switch on the
SI1287 rear
panel
to
’OFF’.
With
[long on]
selected, each set of readings
is output with
the format:
+p.pppppE±pp /
±q.qqqqqE±qq / ej / e
2
/
hh/mm/ss/ss//
PARI
PAR2
ERRORS
TIME
where
errors 1 and 2 relate
to PARI and
PAR2, respectively;
/ represents
the
output separator,
and // the output
terminator. Select
the required
separator and
terminator
via the DATA
OUTPUT {GPIB}
menu; as described
in section
5.5.
With
[short on] selected,
the TIME data
are
omitted
and
the output terminator
is
sent after error 2.
GPIB
& RS423 PORTS:
DUMP MODE
(BINARY)
FORMAT
Dump
Mode
format, in which
results are compressed
into a binary
form to
occupy fewer
bytes, is the
fastest
way
to output
data from the
SI1287.
Each parameter
consists
of a four-byte floating-point
number,
compared with
the
twelve
bytes needed
for ASCII.
Error codes
and
time output are
expressed in BCD format.
Thus
each two digit
error code
uses one byte
and time uses four
bytes
giving
tens
and units of hours,
tens
and units of minutes,
tens and units
of seconds, and
tenths and hundredths
of
seconds:
hh
mm ss ss
To obtain
dump mode
output, set the
DATA OUTPUT
{GPIB} menu
to either
[long
dump]
or [short dump], and
the Talk Only
switch on the
SI1287
rear
panel
to ’OFF’ (for
GPIB operation).
Set the
{RS423} menu to [dump], which
produces
the
same format
as the GPIB [long
dump] selection.
With
[long dump]
selected, each set of readings
is output with
the format:
PPPP q q q
q
e
2
e
2
hhmmssss
PARI PAR2
ERRORS
TIME
The
following
section 5.4.1 explains
how to decode
the four parameter
bytes
from binary
to decimal notation.
Output
separators and terminators
are not
sent
in
dump mode format.
However, in the
case of GPIB
operation only, EOI
(End
Or Identify)
is automatically asserted
simultaneously
with the last
byte if either
[cr + EOI]
or [cr If + EOI]
has been selected via
the DATA
OUTPUT
{GPIB}
menu.
With
[short dump]
selected, the bytes
representing TIME
are omitted,
but the
output format
is otherwise identical.
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