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Quite often the location is measured on a relative basis; that is, a certain location on a part is
a zero or reference. For example, assume that a zero is required at distance
"t"
from the gage
or 0 position of the machine.
X = the number currently displayed.
t
=
compensated distance from the gage.
s
=
a normalized software offset.
For reset, s
=
t
and
to
=
t
at time of reset
if preset (P) desired, to
=
-P
+
t at time of reset,
where P is the preset number.
4.15
Handshaking Routine between a Controller and the 10746A Binary Interface
In
these
examples,
the
10746A
Binary
lnterface
is
inputting
from
and
outputting
to
an
HP
125668
pcircuit
interface
card.
Figure
4-4
shows
how
to
send
data
or
instructions
to
the
10746A,
and
Figure
4 5
shows
how
to
obtain
data
from
the
10746A.
Since the flag and control signals from the 10746A are very fast, care must be taken to inter-
face simply to the 12566B pcircuit interface card. As the 125668 Input latches are not edge
triggered,
it
is necessary to have the input latches follow the data. After a flag is received, the
data can be loaded via an LIA instruction and the computer clears the control signal to the
computer.
COMMAND
0
DATA
SET CONTROL
/
CLEAR FLAG
LIA INSTRUCTION
INSTRUCTION
CLEAR CONTROL
INSTRUCTION
INPUT NOP
INPUT DATA INTO A-REG SUBROUTINE
STC SC, C
SET CONTROL, CLEAR FLAG
SFS SC
CHECK FLAG
JMP '-1
10746A
LIA SC
INPUT DATA TO COMPUTER
CLC SC
CLEAR
JMP INPUT, I
CONTROL
Figure
4-4.
Receiving
Data
from
the
70746A*
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Troubleshooting
