Commodore 64 Handbook page 82
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CCITT V24 Circuit Definitions
Circuit 102 - Signal Ground or Common Return
This conductor
establishes
the
signal
common
return
for
interchange circuits.
Circuit 103 - Transmitted Data
The data signals originated by the
DTE,
to
be
transmitted
via the data channel to one or
more
remote
data
stations,
are transferred on this circuit to DCE.
Circuit 104 - Received Data
The data signals generated by the DCE, in
response
to
data
channel line signals received from
a
remote
data
station,
are transferred on this circuit to the DTE.
Circuit 105 - Request to Send
Controls the data channel transmit function of the DCE.
Circuit 106 - Ready for Sending
Indicates whether the DCE is conditioned to transmit data
on
the data cha n n e l .
Circuit 107 - Data Set Ready
Indicates whether the DCE is ready to operate.
Circuit 108/1 - Connect Data Set to Line
Controls
switching
of
the
signal-conversion
or
similar
equipment to or from the line.
Circuit 108/2 - Data Terminal Ready
Controls
switching
of
the
signal-conversion
or
similar
equipment to or from the line.
Circuit 109 - Carrier Detect
Indicates whether the received data channel
line
signal
is
within appropriate
limits,
as
specified
by
the
relevant
recommendation for DCE.
Circuit 110 - Data Signal Quality Detector
Indicates whether there is a
reasonable
probability
of
an
80
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