Address Codes; Talk-Only (No Controller); Hp-Ib Programming; Algorithm - HP 3456A Operating And Service Manual

Operation
NOTE
Setting the 3456A 's Address Switch to the
Listen Address' corresponding decimal code
will also set the Talk Address.
�
TALK
ONLY
,
" POSITION IDOWNI
NOT USED
CoOl
ASCI(
Uuen
T.I� AO
• 0 0
0 0
A
,
.. 0 0
,
0
# 0
,
0 0 0
•
•
0 0
,
0
0
,
G 0 0
H
I 0
,
0
, ,
0
,
,
0
, ,
0
,
,
M 0
,
�
0
,
0
•
,
0
0
, ,
0
, ,
0
, , ,
0
•
,
, ,
0
u
, ,
0
,
,
0
• v
•
,
0
,
,
,
, , ,
, , , ,
, , ,
I
, ,
\
, ,
·
> I
, ,
-
, ,
Tabla 3-8. 3456A Add .... Cod ...
3-153. Instrument address commands are usually in this
form:
universal unlisten, device talk, device listen.
The universal unlisten command removes all listeners
from the HP-IS to allow only the addressed listener to
receive information. The information is sent by a talker
which is designated by the device talk code.
]·154. Talk·Only (No Controllerl.
3-155. Setting the 3456A to the "Talk-Only" mode can
provide measurement data to another device, like a
3-22
INSTRUMENT
AOORESS
,
1 POSITION luPI
s..b ; ,
o.c Cod •
, .. 1
..
0
0 0 00
"
0 0
"
,
0 0
"
,
0
, ,
0 0
, '"
0
"
, , '"
0
"
, ,
, , ,
0
0 0
..
0 0
"
,
'"
0 0
"
,
0
"
, ,
0 0
"
,
0
"
,
,
0
"
, ,
0 "
, , ,
0 0
"
0 0
"
,
0
0
"
,
0
, ,
0 0 �
"
,
0
, , 4seA
,
0
"
, , 22--FA CTOFlY
, , ,
.ttinll
,
0 0 0
,.
0 0
,
"
0 0
,
"
0
, ,
"
0
0
,
"
0
, ,
"
0 so
, ,
printer, without a Bus controller. The 3456A is placed
to the "Talk-Only" mode by setting the rear "DIP"
switch to the mode (set the seventh switch to " I "). Once
this is done measurement data is output after each trig­
ger. Instrument set up (function, range, etc.) is done
from the front panel.
]·156. 3456A Hp·IB Progremming.
3-157. Now that the basic HP-IB operation is known,
the next thing is to program and use the 3456A over the
Bus. First, determine the measurement or instrument
operation you want. Then determine the 3456A's pro­
gram codes. The codes are ASCII characters transmit­
ted over the HP-IB to the instrument.
3-158. Once you have defined the instrument criteria
and program codes, next write an algorithm on how to
make the measurement. When you have done this, con­
vert the Algorithm to controller language. Refer to your
controller's operating manual for the language.
]·159. Algorithm.
3-160. The algorithm should show exactly how to set up
and use the instrument in a certain function. To simplify
the algorithm, use the twelve Bus Messages as key words
in the algorithm. The messages are repeated here for
your reference.
I . DATA
2. TRIGGER

3. CLEAR

4. REMOTE

5. LOCAL
6. LOCAL LOCKOUT

7. CLEAR LOCKOUT AND SET LOCAL

8. REQUIRE SERVICE
9. STATUS BYTE
10. STATUS BIT

PASS CONTROL

1 1 .
12. ABORT
3-161. The definitions of the Bus Messages are given in
this manual's Appendix
Remember, refer to your controller manual to convert
the messages. If you have an -hp- Model 9825A Con­
troller, the controller's Extended 1/0 Manual (-hp- Part
Number 09825-90025) has a listing of the codes. For the
9835A/B, refer to the 1/0 Programming Manual (-hp­
Part Number 09835-90060). If your controller manual
does not have a code conversion chart. you may be able
to use the technical description of the messages located
in Appendix A.
3-162. Here is an example Algorithm for the 3456A.
Note that only the key words are used, not the codes.
a. In this algorithm, the 3456A is set up to make a
DCV measurement, output it over the HP-IB and print
the reading. The program ends if the 3456A sends a Re­
Quire Service Message. The algorithm is as follows.
Model 3456A
A, Paragraph
A- I t .