IBM 2740-1 System Reference Manual page 9

• a negative response to an address.
• a negative response to a poll.
• a negative answer to an EOB/LRC sequence when
the checking feature is installed.
hyphen or underscore character is printed as an
indication of this condition (a different character
is printed on IBM World Trade machines).
(§ )—SOA (Comma character). This is used to indi­
cate a start-of-address condition, and is used when
the station control feature is installed.
(d)— Positive Answer, Inquiry (Pound sign charac­
Either the
ter) .. This signal is used in a multiplexer operation
as a positive answer to an EOB/LRC sequence from
the terminal (Figures 11 and 15).
the terminal switches to a receive status.
character associated with this signal is not printed.
At this tim e,
IBM 2740 Communication Terminal, Model 1
The
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