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e.
Remember certain instructions (e.g., 3 0 or 3P) that request an output from the Coupler
require that after the next handshake, the controller must read in the data from the
Coupler. With the Binary Interface this i s normally done using a RBYTE instruction
(the controller reads either four 8-bit bytes or two 16-bit bytes).
f.
I n the case of the 4 P command the comparator card expects to receive data from the
controller with the next handshake. Note that this applies only to the 10746A Binary
Interface. The 10745A HP-IB Interface cannot send data and, therefore, cannot be used
with the comparator card.
g.
There is one handshake for the instructions (e.g., 3P) and then a handshake for each
word or byte of data transfer. For two 16-bit words, two additional handshakes. For
four 8-bit bytes, four additional handshakes.
h.
With the Laser Transducer System it is easy to check just a few cards at a time. You
can check the display by writing a simple program that enters data from the keyboard
and then outputs
it
to the display. The coupler can be checked by simply inputting
compensation numbers. Use the calculator display to observe the data to help simplify
the troubleshooting.
i.
Be sure to determine the correct polarity of your interface card (this does not apply to
the 10745A HP-IB Interface). Some cards are positive-true (e.g., the 10746A Binary
Interface). Other cards are negative-true. The quickest way to check (if there are no
other malfunctions in the system) is to send different commands both ways. Refer to
Table 4-11 for examples of specific commands.
j.
Remember that with the binary interface it is possible to have an overflow error and
still have valid data. In order to strip off the error bits and get the decimal point bits
plus the displacement bits, give any command that starts with 0 (e.g.,
00).
This
clears the binary interface card error bits. Then give a 3 P command.
k.
At the beginning of each program using the HP-IB,
it
is very important to give a device
clear and a remote enable instruction (refer to Table 4-72).
I.
Keep in mind that a 2V instruction outputs the previous compensation value. There-
fore its accuracy depends on how often the compensation number is updated.
m.
The characters 0(zero) and
0
(as in Oslo) are different and not equal.
4.19
OPERATION
The
operating
procedures
(other
than
initial
turn
on)
for
the
Laser
Transducer
System
are
dependent
on
the
programming
and
design
of
the
system
controller.
For
your
convenience,
Figures
4-6
through
4-9
provide
locations
and
descriptions
of
the
controls
and
indicators
on
the
system
units.
1 1
I
LED
Indicator.
Lights
when
laser
beam
is
sufficient
to
activate
receiver.
3
I
1
Receiver
Connector.
I
1
Test
Point.
Provides
0.6
to
1.5
Vdc
output
when
receiver
is
activated.
ICALLV
ISOLATED
FROM
Figure 4-6. 10780A Receiver
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Table of Contents
Troubleshooting
