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The
CR/EOT
switch also
selects the
line
turnaround
discipline the
Hazeltine
2000
will
observe.
(1)
In
the
CR
position, the
line
turnaround
will
always
be caused by
the
remote computer
via the
"super-
visory" channel
option of
WE202
type
modems.
(2)
In
the
EOT
position,
line
turnaround
is
caused by
the
receipt
or transmission
of the
EOT
code.
The
CR/EOT
switch
is
operational at
all
speeds
select-
able
in
the
terminal.
2.
CA ON/CA
Auto Panel
Switch
a.
General
-
Use
of
Half
Duplex Datasets such as
the
WE202C
require transmit/receive
conditioning
by
CA
which
is
auto-
matically controlled by
line
turnaround
discipline.
Observed
transmit/receive
status of the
modem
is
therefore desir-
able for
some
applications.
b.
Terminology
CA
-
Request
to
send
(from
EIA
std.
RS232
data
set
con-
nector pin
4).
c.
Purpose
With
the
CA
switch set
to
CA
ON,
the
RECEIVE
indicator
reflects the
RECEIVE
status
of
the
terminal.
With
the
CA
switch set
to
CA AUTO,
the
RECEIVE
indicator reflects
the status
of the
modem
control signal
which
in
turn controls
the
modem
transmit/receive
status.
When
the
RECEIVE
light
is
OFF,
the
modem
is
conditioned
to
transmit.
When
the
RECEIVE
light
Is
ON,
the
modem
Is
conditioned
to
receive.
d.
Intended
Use
Normally,
for
speeds up
to
300 baud,
type 103
modems
are used and
the
CA
switch should be
set
to
CA
ON.
For
higher speeds
(600,
1200,
1800
baud),
a 202C-type
modem
Is
used and switch should be
set
to
CA
AUTO.
10
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