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Data Communications
Table 5-3. Keyboard Communications Switches
DUPLEX
HALF
I
FULL
PARITY
EVEN
I
ODD
NONE
RANGE
131
IT£]
I
PARITY
EVEN
I
ODD
NONE
..
BAUD RATE
~
oo
1200
150
2400
110
4800
EXT.
9600
BASIC COMMUNICATIONS
DATA COMM SWITCHES
DUPLEX Switch. HALF: Typed characters are processed by
the terminal and transmitted to the computer. FULL: Typed
characters are transmitted to the computer and not processed
by the terminal until returned from the computer. (This func-
tion is ignored in Block Mode.) Not present on terminals with
multipoint interfaces.
RANGE Switch.
This switch is used to select ranges for the
BAUD RATE switch (multipoint only).
PARITY Switch. When set to EVEN/ODD/NONE, even/odd/
no parity is transmitted for each character. Incorrect parity: a
..... is displayed.
BAUD RATE
13~5
1 5 0 ) : "
1 10
2 0 0 ' •
75
300
••••
50
600
MULTIPOINT
DATA COMM SWITCHES
In basic communications, transmits a BREAK sig-
nal to interrupt computer operation. (Transmits a
200 ms space on the asynchronous data communi-
cation line and sets secondary channel low for 200
ms.)
In multipoint an RVI is transmitted instead of ACKO
or ACK1 i f " is pressed while the terminal is
receiving text (Text-In). In other multipoint modes
t h e " key clears the data comm output buffers
and sends a CN (CANCEL) to the computer. (Refer
to the BREAK KEY description under multipoint.)
•
The indicator will be lighted when a data link exists
TRANSMIT for transmission between the terminal and the com-
puter.
!Basic Data Communications only
BAUD RATE Switch.
Selects data transmission rate of 110,
150, 300, 1200, 2400, 4800, or 9600 baud. EXT: any rate
between 110 and 9600 can be selected from an external
source. The 110 baud rate uses 2 stop bits per character; all
others use one stop bit. In Multipoint configurations the follow-
ing additional speeds are available: 600, 1800, 3600, and
7200.
II:m:II
-=r:DI
When down the terminal is in Remote (on-line)
operation. Otherwise, the terminal is in local (off-
line) operation.
When the terminal is in Block Mode, typed data is
displayed but not transmitted to the computer until
requested by the computer or until after the
. . key has been pressed and the computer has
responded. Otherwise, the terminal is in Char-
acter Mode and data is transmitted as typed. (See
"Block Mode". In multipoint configurations the
terminal is always in Block Mode, regardless of key
position.
On-Line Mode
• Character Mode, Format Off. The entire line con-
taining the cursor is transmitted as a block.
• Character Mode, Format On. Unprotected char-
acters from the cursor position to the end of the
unprotected field are block transmitted. The cur-
sor is left at the first character position after the
end of the field.
• Block Mode, Format Off. After receiving a DC1
from the computer, the terminal informs the com-
puter by transmitting a DC2 control character (or
DC2 CR(LF) with Line Strapping -
see "Strap-
ping Options" that the terminal is ready to trans-
mit characters from the cursor to the end of the
line of memory (dependent on Line or Page
strapping).!
• Block Mode, Format On. After receiving a DC1
from the computer, informs the computer by
transmitting a DC2 (or DC2 CR(LF) with Line
Strapping) that the terminal is ready to transmit
line or current field, or all unprotected fields from
the cursor to the end of memory, each delimited
by a unit
s~parator,
US (dependent on Line/Page
strapping).!
5-4
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