Fluke 8506A Instruction Manual page 251

8505A/8506A-07
807-5.
INSTALLATION 007-7.
OPERATING
607-6.
The
Parallel Interface
is
easily installed as
a
module
in
the 8500
series
DMM.
Use the following
installation
procedure:
1.
On
the
DMM,
press
power
OFF
and remove
the
line
power
cord.
2.
Remove
the
DM
M's
top cover,
3.
Ensure that the desired personality card
is
installed
on
the Interface
PCB.
If
necessary,
refer
to
"Module
Disassembly"
in
Section 4 of the
Instruction
Manual when
accessing the Interface
PCB.
NOTE
If the -07
L
Personality
Card
is
used
remove
jumpers
W1
and
W2
from
the Interface
PCB.
4.
Plug the personality card
into J2
on
the
Parallel
Interface
PCB.
The
location of
J2
is
illustrated
in
Figure
607-1.
5.
Reassemble
the
module
(PCB
and
shield
covers).
6.
The
Interface
module
fits
in
the
rearmost
slot,
bus connector
and
address switches facing the
rear.
Slide the
module
vertically
between
the
module
guides,
and
press firmly into place.
NOTE
Make
sure the leaf spring, attached
to
one-
half of the
module
shield,
is
resting
firmly over
the flange
of
the opposite
half of the
module
shield.
7.
Remove
the Interconnect
PCB,
if
installed,
from
slot
K.
This
slot
can be
identified as
the only
one
with connectors
on
the
analog and
digital
bus
lines.
To
remove
the interconnect
PCB,
grasp the
board
at
both
ends,
and
pull up.
An
end-to-end
rocking
motion may
be necessary
to free
the
PCB
from
its
connectors.
The
Isolator
module must
be
installed in slot
K
whenever
a
remote
interface
(Option
-05,
-06 or -07)
is
used
in
the
DMM.
NOTE
Use
Isolator -08 with the
8500 A; Isolator -08
must be used
with
the
8502 A.
8.
Replace
the
DM
M's
top cover.
9.
Energize
the
DMM.
607-8.
The normal power-up
condition of the Parallel
Interface
is
eight-bit
ASCII
input
and
output.
Command
codes can
change
this
to
16-bit
ASCII
input (two
characters per
transfer),
16-bit
ASCII
output,
8-bit
Binary output, or
16-bit
Binary output
in
character
serial
format.
607-9.
When
the front panel
remote
switch
is
pressed
on
the
8500 A,
the
DMM
stops
measurements and
waits for
stimulation
from
the external device.
On
the
8502A,
pressing the front panel
remote switch
results in
the
Parallel Interface trying to
output data (ASCII
8-bit) in
a
continuous
talk
only
mode.
607-12.
Data
transfer
through
the Parallel Interface
involves
handshake
processes
between
the interface
and
either the system controller or the instrument
controller.
Refer
to the
Block
Diagram,
Figure
607-2,
during
the
following descriptions.
607-13.
At power
on, a
reset circuit in
the interface
holds the control latches
in
the
proper
state until
Vcc
stabilizes.
The
instrument
controller
sends a software
reset
and an
interrupt
enable
signal to
the
interface
during
its
power on
routine.
This enables I/O operations to proceed.
607-14. This paragraph
describes
a
typical
two-wire hand-
shake
process for transferring
commands
through the
inter-
face to the
DMM.
Before the system controller
attempts
to
send data to the
instrument
it
verifies
that the
DMM
is
ready
to accept the data. If
the Control Input
Ready (CIR)
handshake
signal
indicates the
DMM
is
ready, the
system
controller can strobe the
Control Input Strobe (CIS) hand-
shake
signal
line.
The CIS
has three functions.
One
clocks
the input data placed
by
system
controller
on the input
lines into the
data input
latches
of the -07
interface.
The
second generates an interrupt request to the instrument
controller.
The
last
toggles the
CIR
handshake
signal to
indicate that the
DMM
is
not ready and cannot accept
addi-
tional
input
data.
The CIS
interrupts the
DMM
which
responds by accepting the input data from
the
-07
interface
data input latches
and
toggling the
CIR
handshake
signal
to
indicate that the -07 interface
is
now
ready
to
accept
addi-
tional
data
from
the
system
controller. This process
is
repeated
for
each input operation
607-3