I
Serial Communication Modes
The serial port communication mode determines
where data goes when you press a
key
-
to
the
screen, the computer,
or
both.
Full duplex Most "interactive" application pro-
grams (those where you enter commands
or
data
and the computer responds) work best with the
terminal in full duplex communication mode. Your
terminal is set for full duplex mode when it comes
from the factory.
In
full duplex mode, the terminal sends key codes
only to the host and not
to
the screen. However,
hosts often "echo" key codes back to the terminal,
so the printablecharacters you type appearon your
screen.
Halfduplex
H yourhost does notecho
key
codes
back to the
ternlinal, you can set it for half duplex.
Then the
ternlinal sends key codes both
to
the host
and to the screen.
Block Data you enter goes only to the screen
until you send it to the host
by
pressing
theSEND
key. However, the terminal can still receive any
data the host sends.
Local The terminal turns
off
all communication
with the computer. Data entered at the keyboard
goes
to the screen, and the terminal does not re-
ceive any data from the computer.
All
keys act as
local keys.
NOTE: Once the terminal
is
in
local mode,
it
cannot receive any commands from the
computer to change to another mode!
To
restore communication, you must reset the
terminal or enter set
up
and change the
mode.
Sending Blocks
of
Data
You can send screen data to the host only when
the terminal
is
in block mode.
For a page send, press and release Esc, then
7.
All data from the top
of
the screen through the
cursor position goes to the host.
For a line send, press and release Esc then press
IShiftI
[I]
To interrupt transmission from the terminal to the
host, use the Local Key Command (for your key-
board) to initiate a partial reset.
Editing Key Modes
Editing
key
modes affect most editing keys (keys
that control cursor movement, editing, and data
transmission). Application programs usually de-
ternline this mode, but you can also change it in
set up (Program menu).
NOTE: If your editing keys do not operate
as expected, check the communication and
editing key modes.
The terminal has three editing key modes:
Local Editing key commands go only to the
screen,
in
all communication modes. In effect, the
editing keys become local keys. So you can al-
ways use the editing keys to move the cursor,
change data on the screen, and send data to the
computer and printer.
Host Editing key commands
go
only to the com-
puter,
in
all communication modes except local.
How the computer handles them depends entirely
on its programnling.
Normal Editing key commands are handled the
same as other characters you
type-they
go
to
the
computerand/orthe screen,depending onthe com-
munication mode.
OPERATION 3-12
USER'S GUIDE
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