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PROCEDURE Open(port: TEXT; baudrate: INTEGER): int RAISES {OpenError};
PROCEDURE Close(fd: int);
PROCEDURE Send(fd: int; msg: TEXT);
PROCEDURE Receive(fd: int): TEXT;
PROCEDURE SetBaudrate(fd: int; baudrate: INTEGER);
PROCEDURE ToggleDTR(fd: int);
PROCEDURE DTROn(fd: int);
PROCEDURE DTROff(fd: int);
PROCEDURE RTSOn(fd: int);
PROCEDURE RTSOff(fd: int);