Racal Instruments 9916 Workshop Manual page 79

4. The parallel output data is updated at the end of each gate time unless the printer
(or other data processing equipment) is applying a Hold Signal. In addition to
measurement data the interface also transfers information on decimal point position, selected
range (gate time) and the 'overflow' state of the counter displdY. Information supplied is
for 8 digits (excluding decimal point data) on all units except the 9917 and 1197A which
supply information for 9 digits.
5. Fig.
Al.
sho'HS the sequence of events which occurs at the end of the gate time.
Note that when using counters 9910, 9911, 9912 and 9919, and when using counter
9908 on 'A' channel with AC coupling, all timings are doubled, except the print command
pulse width.
NEW MEASUREMENr
NEW MEASUREMENT OArA OLO MEASUREMENr DATA
- - G A T E TIME
----~L ~E~D_O~ :r~'
_
I
I
I
I
I
I
~l-zmsflms
l
- - - - - - - - ' - - - I
I~---------
I I
I I
I I
I
I
----------·--ix-----------
I
I
I-
q O A r A Nor VALID
I
I
,
I
OArA UPOAIE
OUTPUT
DATA
0·8-1·$
m.
PPJNT COMMANO
Fig.A'
CONNECTION
6. Before connecting the Interface Unit to the count(r refer to the modes of operation
in paras 8 to 18 and make the necessary changes to the 50-way connection or
28~way
fl
yi ng Ieed, accordi ng to the type of counter in use and the requi red function. All changes
on the SO-wey connection shou Id be made at the customers connector.
7. Having checked·the appropriate connection changes in poras 8 to 18, the interface
should be connected up as follows:-
(1) Remove the black pi ate whi ch covers the
DATA OUTPUT
aperture on the rear
panel of the counter. Retain the two screws.
Section 4 : 99 sertes. Appendix 1.
Page App. 2.