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Operation
Model 11713A
Receiving the Data Message
The Driver responds to Data Messages when in
remote and addressed to listen.
Data Message Input Format. The programming
data string for the Driver consists of a string of
ASCII coded characters composed of one or both
of the following fields:
[Adm] [Bdn]
where A or a = general on command
B or b = general off command
dm = any digits 0—9 (excluding dn)
dn = any digits 0—9 (excluding dm)
The Driver responds to an alphanumeric data
string such as "A12B34" when the Driver is in the
Remote state and addressed to listen. (The alpha
characters in the data string can be either upper or
lower case.)
- - -Xhe-data-str-ing-is-furiher-defined asToUows;-
Ax Bx Ay By A/B 9 A/B 0
where Ax Bx = Data string for ATTEN X; where x
..:... ■ ... canTie non^ one or mdreoffhe'
digits 1,
2,
3 or 4.
Ay By = Data string for ATTEN Y; where y
can be none, one or more of the
digits 5,6,7 or 8. If Ax (Ay) uses a
digit, then that digit may not be
used in Bx (By).
A/B 9 = HP-IB Commandfor switch S9, and
A/B 0 = HP-IB Command for switch SO.
e.g., "A12B34 A56B78 A9 BO"
The data string contains the operation selected by
the operator (desired contact closure, value of
attenuation, etc.). The coded command from the
controller is converted by the Driver into control
voltages. The output control voltages drive the
device and illuminate front panel lights that indi¬
cate the operation selected. Table 3-4 shows the
relationship between each programming code and
the effect it has on the output at each connector/
pin. Table 3-5 shows the programming strings
required to set up various three- and four-section
attenuators to the desired levels of attenuation.
Figures 3-3 and 3-4 show the rear panel connec¬
tions and the HP-IB commands necessary to
change the position of the SPDT RF Switch and
the Coaxial Switch.
Table 3-4. HP-IB Control Statement Results
Front
Pane!
Digits
Connector
Connector
Pin
Numbers
Command Result
A
S
i
ATTEN X
5
.H
L
6
L
H
2
rj
H
L
8
L
H
3
9
H
L
10
L
H
4
11
H
L
12
L
H
5
ATTEN Y
5
H
L
6
L
H
6
7
H
L
8
L
H
9
H
L
10
L
H
8
11
H
L
12
L
H
9
S9
A
+24V
B
+24V
\
.
V
—
...
.
B
V
+24V
..
<7
H = -Open (High)
L » Closed (Low) — current sink to chassis ground
Connected to chassis ground,
For sample programs and explanations using the
9825A Desktop Computer, refer to the Program¬
ming Note, Index Number n713A/9825A-l, an
Introductory Operating Guide for the 11713A At¬
tenuator/Switch with the 9825 Desktop Computer.
Program Execution Time. The response time for the
Driver is defined as the time between data valid
(DAV) changing from a high to a low and the
output signal at the rear panel connector chang¬
ing state. The switching speed of the Hewlett-
Packard programmable attenuators is 20 ms in¬
cluding 10
fi8
for the Driver(ATTEN outputs). The
switching speed for the RF switches is 50 ms plus
20 ms for the driver (S9 and SO outputs).
Sending the Data Message
The Driver does not have the capability of sending
a Data message.
3-10
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