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No
Yes
Yes
Yes
Position beam to center
of detected segment
M
Display all 4 dots, and
return beam to center
Display far-right segment
of detected vector
Display right-center
segment of detected vector
Display left-center segment
of detected vector
Display fer left segment
of detected vector
Yes
Yes
Yes
Display
top
horizontal vector
Display upper
horizontal vector
Display middle
horizontal vector
Display lower
horizontal vector
Display
bottom
horizontal vector
Q
Turn lock off
Entity
POint 1
A
Enter
Position beam +O
starting location
Display any
previous entities
Track
Drow rubber hand
Clear pending detects
Defer light-pen detects
Enable No Switch Detect
Display center dot
G
Update symbol position
Enable light-pen detects
Defer light-pen detects
Intensify at current
beam position
REST
Rest of program
H
Display left dot
Exit, Next
Yes
Store current
location adr. in Entity
Store
Update store routine
cc
No
Left dot
c
Turn on lock.
(Reset lock to P to
perm it search)
Display right dot
new X center
Move beam to
right dot position
Yes
Display left dot
No
Yes
D
Recenter beam
Right dot
Center
L----------1.,a-.une._,w._,,X'-'c"'e"'nt.,,e,__r
- - - - - - I - . . - - - - - - - - - - - - - '
unchanged
K
Display lower dot
No
No
Display upper dot
Lower
dot new
Y
center
. L
Move beam to
upper dot position
Upper
dot new
Y
center
Ye•
No
Display lower dot
Recenter beam
Y
center
unchanged
Figure 18. Flow Diagram of Example Program
2840 Operations with the Channel
49/50
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