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Model
8672A
Operation
3-16.
REMOTE
(HP-IB)
OPERATION
3-17. The Synthesizer
can be
operated through the
Hewlett-Packard Interface
Bus
(HP-IB). For further
information about the HP-IB, refer to
IEEE
Stand¬
ard
488-1975,
the Hewlett-Packard catalog, and
the
booklet "Improving Measurements
in Engineering
and
Manufacturing" (HP
Part
No. 5952-0058).
Synthesizer compatibility, programming, and data
format
is
described
in
the paragraphs which
follow.
3-18. Synthesizer Talk
and Listen
address,
and
Parallel and Serial Poll response selection
is de¬
scribed in Section
II.
3-19. For Synthesizer remote checkout
and trou¬
bleshooting, refer to the Remote Operator's Check
and
the HP-IB Diagnositc Program
in Section
VIII.
The Remote Operator's
Check
verifies
that the
Synthesizer's functions
can
be programmed
while
the
HP-IB
Diagnostic Program
tests
the
Bus func¬
tions
of
the Synthesizer.
3-20. Compatibility
3-21. The Synthesizer
is
fully programmable
with
the
HP-IB. Front
panel
functions
except
the
LINE
switch
Q
,
(see
Figure
3-1).
METER
MODE
selector
0
,
PEAK-NORMAL
control
@
,
and
CAL
control
Q
can
be programmed.
3-22.
The.
programming capability
of
the
Synthe¬
sizer
will
be described in
terms
of the
twelve
bus
messages
found
in
Table 3-5.
3-23. Local/Remote
and
Remote/Local
Mode
Changes
3-24. The
Synthesizer can communicate
over
the
bus
when in remote
or
local.
In remote,
the
Synthesizer's
front
panel controls
are
disabled and
the Synthesizer
can be addressed
to talk
or listen.
When addressed to listen, the Synthesizer will
re¬
spond to the
Data,
Clear
(SDC), Local,
and
Clear
Lockout/Set
Local. When
addressed
to talk, the
Synthesizer
automatically
stops listening and
sends
a
status
byte
over the eight data lines. Also,
the
Synthesizer
can send
a
service
request
(SRQ)
and
respond to
serial
and parallel polls and the
Abort
message.
In local, the Synthesizer
is
fully
con¬
trolled by the front panel, but it will
respond to
serial
or parallel polls, it's
talk
address, and
it
will
send
a
service request
(SRQ).
3-25.
Addressing.
The Synthesizer interprets the
byte on the
bus'
eight data lines
as
an
ASCII
ad¬
dress
or command
if
the remote enable line
(REN)
is
true
and the bus
is
in
the command mode:
atten¬
tion
line
(ATN)
true and interface
clear
line
(IFC)
false.
The Synthesizer's
talk
and listen
addresses
are switch selectable
as
described in Section
II.
Referring to
Table
2-1, characters in columns
2
or
3
are
valid listen addresses, characters in columns
4
and
5
are
talk
addresses, and characters
in column
1
are
commands: device clear
(DC),
serial
poll
en¬
able
(SPE),
and serial
poll
disable
(SPD).
3-26.
Programming the Local to
Remote Mode
Change.
The Synthesizer will switch to
remote
only when
addressed
to
listen. When first switched
to
remote, the
REMOTE
lamp
lights and
the VER¬
NIER
resets
to —10 dB. Nothing
else
will
change
from
the front panel control
settings
until
the
Synthesizer
receives
a
data
message string.
Once
in
remote, the
synthesizer can be
addressed
to talk,
re-addressed to listen,
programmed to return to
local, or unaddressed
with
the universal Unlisten
address
or
Abort
message.
3-27.
Programming the Remote to Local Mode
Change.
The Synthesizer will return to local
when
the
Local
or Clear
Lockout/Set Local
messages are
sent
by the controller.
The
Clear
Lockout/Set
Lo¬
cal
message sets
the remote enable
line
(REN)
false.
3-28.
Data
Messages
3-29. The
Synthesizer communicates on the
bus
primarily with data
messages.
It
responds
to data
messages
that program frequency, output
level,
modulation
and
ALC
configuration.
It
sends
a
byte
that
describes its status.
Data
messages
consist
of
one or
more bytes
sent over
the bus'
8
data
lines
when
the
bus
is
in the data mode
(attention
line
[ATN]
false).
The
Synthesizer receives data
mes¬
sages
when
addressed
to
listen and
sends
a
status
byte when
addressed
to
talk.
3-30.
Receiving
Data
Messages
3-31. The
Synthesizer can receive
Data
messages
when
addressed
to
listen.
The Data
message
string,
or program string,
consists
of
one or
more
ASCII
characters, arranged
as
a
program code
followed by
arguments.
The
codes and
arguments for
a
given
function
need
not
be on
the
same
program line.
3-32.
Data Input Format. The program string
syn¬
tax
is as
shown in
Example
1.
For example, to
pro¬
gram
the four functions for
12.596365 GHz,
—94 dBm
AM
and
FM OFF,
and
ALC
internal
nor¬
mal,
use
the program
codes and arguments in
Table
3-10
and
write the
string
as
in
Example
2.
3-13
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