18 
Interface 1 
Plotting "Conventional 
  
  
  
  
  
  
  
  
  
  
  
| Device Instrument 1 a-no.Display 
mR Keyboard 1 
= == ee = Interface 2 
| Plotting Conventional Pine. 
à ; 
{Device  _ i Instrument 2 @-no. Display 
Keyboard 2 Mini — Input/Output 
  
  
  
m Computer |e] Units 
FEM Ree zc des 
| Graphic CRT | 
a I. 
| Display Terminal(s) | 
| 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
t Device Instrument n | 
emite e Loren 
Œ-no. Display 
Keyboard n 
figure 6a 
simple multiple system (serial) 
In simple multiple systems the central computer does not directly affect 
the operation of individual (sub-)systems. However, it may provide support 
in the preparation stage and signalise presence of gross errors. Its main tasks 
are related to data conditioning, administering and recording. Efforts to 
create such systems have been made by Wild, Zeiss Oberkochen, Matra/SFOM, 
Kern and others. 
In systems with a distributive computer network (figure 6b) the central 
computer directly affects the operation of individual micro- (or table-top) 
computers. The latter can communicate with one-another and can use 
common peripheral units. Such systems are more flexible and the level of 
interactivity between operator and digital components is higher than in 
simple multiple systems.