Comtrol 550 Manuel D’Utilisation

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There are two names for each port, one is for communication with a 
modem, the other is for communication with a terminal or computer 
 
Usually the modem connection has a Device name like 'cuaa..' and 
the terminal/computer connection has a name such as 'ttyA..' 
 
 
See section 6 for more information about port naming. 
 
 
You are prompted to enter the Special Device name prefix for terminal ports: 
 
 
 
Please enter the Special Device name for terminals [....]