Operation Of The Keys; Attn Key; Transmit; Receive - IBM 5100 Communications Manual

Operation of the Keys
The following keys perform the same functions in communications as they do in
APL or BASIC language operations:
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ATTN KEY
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Backspace (delete function)
Forward space (insert function)
The action of the ATTN key depends on which communications operation is being
performed and whether the ATTN key is pressed with another key:
Transmit
When the 5100 is transmitting data from the keyboard, pressing ATTN sends an end
of transmission character and ends the transmission. The data transmitted is not
printed or written on tape. The 5100 then waits to receive data from the remote
system, and any data received is added to the end of the data just transmitted. When
the end of transmission character is received from the remote system, the data
transmitted and the data received will be printed and/or written on tape as one
message.
Receive
When the 5100 is receiving data, pressing ATTN sends a long space (receive
interrupt), and the 5100 continues receiving until the remote system sends an end
of transmission character. OUT
(0
backspace U backspace T) characters are placed
in the received message to indicate a possible loss of data. When the remote system
ends its transmission, the 5100 changes its state to home.
Edit
Pressing the ATTN key during an edit operation transmits the edited line and an end
of transmission character. This is the same as pressing ATTN during transmit
operations. If you press ATTN after a command is entered, the command is
processed.
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