Datron 1061 - Analog; Poweron

Pin
No.
of
M19
held
low
if
Option
incorPorated
M19-3
M19-11
M19-4
M
19-10
lD
line
low
tDl
tD2
tD3
tD4
Optiorr
checked
AC
c)
ï
RATIO
t
16
Fis.3.2
POWER-ON OPTIONS
FITTED
TEST
high on M18-4, turning the opto-isolator
M2'B
on
and
thus
COND. VAL
(M2'8)
is high,
signalling
to
the
Digital
assembly that
the AC
option
is
fitted.
Similarly.
when
the
O,
I
or RATIO options are
interrogated,
the
appropriate
output of
l\419 is set low
if the option
is
fitted
causing
the
COND.
VAL to
be
set high.
*Note:
lD and
lA
lines
logic'1'=
+5
volts
logic'0'=
0
volts
AD
lines
logic
'1'
=
0
volts
logic
'0'
=
--15
volts
The
next
step
in the
power-up sequence
as
far
as the
analog
circuits
are
concerned,
is to
be
placed into the
DC,
1000V
range
(See
Fis.3.3
Flowchartl'
Firstly,
all
assemblies
are deselected
by
placing
logic'1's
on
all the
lD
lines,
then
setting
the
lAø
and
lAl
lines
low
(see
Fig'
3.41,
clocking
the
option
selects
latches
(M20
Analog
assembly,
M5
AC assembly,
M9 Ohms
assembly.
Ml
Ratio
assembly
from
M17'3.
Both
lA
lines
then
return
high'
e
POWERON
SELECT
DC
LOAD
DC
.EET.'PATTERN
FOR
1OOOV
RANGE
RESELECT
DC
CHECK IF
RATIO
IS FITTED
AND SELECTED
DESELECT
ALL
ASSEMBLIES
LOAD
D-A
WITH
DC
Ib
DAT
CHECK
IF
AC IS FITTED
CHECK IF
N IS FITTED
CHECK
IF
I
IS
FITTED
DITION
PLACE
A-D
INTO RESET
FIG.
3.3
ANALOG
INTERFACE
SEQUENCE:
POWER-UP
I
I
-'ì
tDo
lD1
L o
õ
L- __- _---J
ID
ID
ID
2
L
----øc
.9.9
-
-
-
-CO
€
t
'-J----l----
6----
:c
På:::-
J
L-_-_
co
o(J
õE
o.L
o:
oo
-J
tD5
tD6
tD7
tAl
IAø
L__
_
L_
___
L-----_____
J
I
o
@
@
DC
Clear all
r
Load
D-A
Select
Oplions
I
Conve¡ter
I
l.+ +t0
p
S
----->t<-
270
¡:S
__i+_
27g,
S+l
FIG.3.4
ANALOG
INTERFACE
DATA
LINE TIMING
DIAGRAM
(POWER'UP}
fti'"'