When
the
1617
receives its listen address,
the
Remote LED is
lit,
and
the
instrument
be-
comes
insensitive
to
its
front
panel controls. A
shorter
string
of
characters
can
also
be
used,
to
alter
band
number
for
example
when
the
other
controls
have
been
set
once.
The
shortest
possible
string
is the character
8,
which
adds
one
to
the
previously
se-
lected band
number
.
A
return
to
manual
operation again can be made in
two
ways
.
Either:
1. reset
REN
= false
Or
:
1. set ATN =
True
2. send
unlisten,
listen
address, ?3
3. send, GTL
4. send
unlisten
?
The
first
method
causes all
instruments
on
the
data
bus
that
contain
a Remote Local
function
to
go
to
their
local states.
The second
method
causes
only
the
addressed
instrument(s}
to
go
to
its (their) local
state(s}
(manual
control).
To select an all stop band, choose Band
no.44
and 1/ 1 octave
bandwidth
. (This
attenu-
ates any 1 V
input
signals >
75
dB
in
the
2
Hz
to
200
kHz
range
.)
3.6.2.
Programming
for
operation
with
Hewlett-Packard
9825A
The
following
section
gives some simple examples
for
when
the
Type
1617
is
operating
in
a system
controlled
by a
HP-9825A
desktop
calculator
.
Connection
to
the
HP-9825A
is made via
the
HP-IB (Hewlett-Packard Interface Bus),
using
cable
AO
0157
. The
listen
address
mentioned
in
section 3 .5.2 is used, and
for
the
Parallel Poll Response,
bit
8
has
been selected.
To set a
control,
proceed as
follows
:
0:
dsp
"set
front
panel
controls
on
1617"
1: dev
"1617"
703
2:
dim
A$[5]
3:
ent
"
Input
codes",
A$
4:
wtb
"
1617",A$
5:
jmp-2
6:
end
First,
this
example
allows
the
input
codes
to
be
entered
via
the
keyboard
of
the
HP-
9825A,
which
transfers
them
to
the
Type
1617,
and
then
returns
to
await
the
next
codes. Up
to
5
characters
will
be
accepted (for codes see
section
3 .5 .3)
but
less
than
5
will
also be
correct
. .
The
HP-9825A
has no capability
of
sensing BUSY,
without
blocking
the
interface
bus
un-
til
the
BUSY
condition
has disappeared. Therefore,
it
is
recommended
to
command
the
Type
1617
to
operate
on
local control, before
sending
new
data
to
it,
if
the
previous
data
string
contained
a
"start
record"
instruction
. It is
also
recommended
that
a
reason-
35
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