Configuring Systems for Terminals, Printers, and Other Serial Devices (32022-90051)

Chapter 9 197
Describing Asynchronous Devices
How to Control Terminals
Terminating Reads
Reads can be programmatically terminated in one of several ways:
• An EOR or AEOR character is sent from the terminal.
• The input byte count is reached.
• The read limit timer expires.
• The block mode read timer expires.
• The system break character (if it is enabled) is sent from the
terminal.
• The subsystem break character is sent from the terminal.
• The
[CTRL]-A character is sent from the system console.
• The DTC encounters a parity error (only when parity checking is
enabled).
Note that when using binary editing mode, a read cannot be terminated
by any character. Binary reads can be terminated only if either:
• The input byte count is reached.
• The read limit timer expires.