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Model
3490A
not output
the reading. A
new
reading
is
initiated by
reprogramming
the 34904 or by
going
to
local control.
3-1
18. M3, Addressed
Single
with
Output.
The instru-
ment takes one reading when triggered and outputs
the
reading
if
addressed to
talk.
If not addressed
to
talk,
it
waits for its talk addres to
output or
its listen
addres
to
be
reprogrammed.
After output of the reading data, a
new
reading is initiated
by reprogramming the 34904 or
by
going
to local control. If
reprogramming occurs
before
output
of
the
reading
daIa, a
new reading
will be
taken
according to
the new programming
data.
3-119.
M4,
lnterrupt
Multiple with No
Output.
Pro-
gramming
of No
Output
overrides
that of Interrupt, so
this
mode is
the same
as
M0.
3-120.
M5. Interrupt
Multiple with
Output.
This mode
is the same
as
Ml
except
that if the 3490A
is not
addressed to talk,
it
will
pull
the
Service
Request
(SRQ)
line
LOW after
each
reading
is taken. This
line is taken
HIGH when the
reading is
outputted
or when
new
progamming
data
is
received.
See
Paragraph 3-l
16.
3-1
21. M6, Interrupt
Single with No
Output.
Program-
ming
of No
Output
overrides that
of
Interrupt, so this
mode is
the same
as M2_
3-122.
MT,lnterrupt
Single with
Output.
This mode is
the
same
as
M3
except
that if the
3490A
is
not
add;essed
to
talk,
it
will
pull
the
Service Request
(SRQ)
line
LOW
after
each
reading
is taken.
This line is taken
HIGH
after
output
of the
reading
data or when new
programming
data is
received.
See
Paragraph 3-l
18.
Section
III
3-123. Repeating
an Output. The
3490A can be
made
to output the same
reading more than
once. This
can
be
accomplished
by
programming
the
3490A
with
"M3E"
and outputting the
reading. Then reprogram
the
3490A
with
"T3E".
The 3490A
can output the
same reading
as
many times
as
desired.
Programming
with
"TlE"
initi-
ates a
new
reading.
3-124.
Addressed
to Talk. The 3490A
may
be
ad-
dressed
to
talk by setting
MRE
LOW and transmitting
the 34904
talk
address.
It
may be
unaddressed
to talk
.-by addressing
any other
unit to
talk,
or
by
sending
the
character-
. Figure
3-9 is
a
timing
diagram
for
data and
handshak'e
lines
when
a
printer
is
addressed to
listen
and
the
3490A is
addressed
to talk.
3-125. Output Control. Two
general
modes of
output
are
possible,
depending on
the
remote programming
of
the 3490A. If
normal
output
(Addressed
Multiple
or
Addressed
Single, Table 3-7) is programmed,
the 3490A
will
inhibit
triggers
after
each
reading and
output data if
already addressed to talk. Ifnot
addressed to talk, it
will
wait for
its
talk
address before outputting
data, or for its
listen
address to
be reprogrammed. If Interrupt
output
is
programmed
and the 34904
is not addressed to talk,
it
will
issue
a
Service Request
after
each
reading and
await
recogrition
by the controller. If it is
addressed to talk,
it
will
inhibit
triggers
after
each reading
and
proceed to
output data.
3-1
26. Output
Format.
After
the
3490A
has
been
properly
put
into
an ontput
mode, the
data
will be
MRE
Data
Lines
Program
data
from controller
LDAV
lndicates
to
34904
that data
is available
HRFD
349OA
will
accept
data
349OA
is busy
and
will
not
accept
data
34904 will
aocept new
data
3490A finished
processing
data
3490A
busy
349OA has accepted
and is
processing
data
Figure
3-8.
Timing
Diagram,3490A
Addressed to Listen.
3-l I