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Racal Instruments 9902 Operator's Handbook Manual page 10

Universal counter timers

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UP
PL
EME N
T A_R_Y
_D
AJ A
DATA OUTPUT
CONNECTIONS
Data and
command
information
is
provided on a
28-way
edge connector
accessible via a
removable
cover
on the rear panel
.
The
facilities
and
pin
connections are
listed in
Table
I
below.
The
logic
for
time base
and
function data
is
given
in
Tables 2
and
3,
and
supplementary
information
in
the
Appendix
to this
chapter.
TABLE
1
Data
Output
Connectors
FUNCTION
AND
TIMEBASE
LOGIC CODES
Function Data
Function information format
:
3
lines
coded
as follows.
The
table gives the
logic
available
at the
edge
connector.
The
inverse levels are
applied
to
the
CDI
chip
in
the instrument.
TABLE
2
Function Information
Function
Code
a
¥
C
Frequency
1
1
1
Average
Period
0
1
1
Totalize
A
0
1
0
n
Ratio
A
1
1
0
" B
T.l.
(single line or
double
line
0
0
1
not
averaged)
T.l. (single
line or
double
line
1
0
1
averaged)
Time
Base Selection
Data Output
Time
Base information
;
3
lines
coded
as
follows.
TABLE
3
Time
Base Selection
9902
&
9906 Vol
.
1
Tech. Spec.
(1 1)

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