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' - . . . . - --v-------"
CONTROL
UNIT
INOICATES A
DEVICE
E- - --)
LOCAL CIRCUIT
C:--)
2. A BAOKEN
LINE
INDICATES CODE
RECOGNITION
Figure 9-2. Teleprinter Interconnections
in Local and Line Modes
o In the LINE position, the device is enabled
to send to or receive from the central
processor in the full duplex mode.
o In the LOCAL mode the device is offline,
in the half duplex mode (offline tape
generation and duplication). Figure 9-2
indicates the interconnection of the various
components during LOCAL and LINE
operations.
Auto Shutdown
The teleprinter is equipped with an automatic
shutdown option which turns the device off in
the absence of activity from the central processor
for a 37 second period (when operating with the
control switch set to the LINE position).
The central processor activates the teleprinter
whenever activity is awaiting transmittal. The
operator can also activate the device by pressing
the BREAK key, which is located above the
control switch on the front panel of the device.
PAPER TAPE PUNCH CONTROL
The paper tape punch can be activated manu
ally or automatically,
Manual Operation
Four pushbuttons on the punch give the
operator complete control over punch operation.
ON-The ON pushbutton activates the punch.
It permits characters received by the printer to
be punched in tape.
OFF-The OFF pushbutton deactivates the
punch. It prohibits punching.
TELEPRINTERS
9-2
BSP-The
backspace
pushbutton is
used
primarily for tape correction. Each time it is
depressed, tape moves in the reverse direction
one character space.
REL-The tape release button. When de
pressed, it allows tape to be pulled manually
through the punch unit. This button can be
used in either the ON or OFF condition.
Automatic Operation
Automatic operation refers to an enabled
option which allows the software to start or stop
the punch by sending it specific commands.
PAPER TAPE READER CONTROL
The paper tape reader can be activated manu
ally or automatically.
ManuaI Operation
START-Positioning the lever to the START
position activates the reader.
STOP-To stop the reader the lever is posi
tioned to the STOP position.
FREE-The FREE position of the lever allows
tape to be moved manually through the
reader.
Automatic Operation
Assuming the lever is in the AUTO position,
the reader will respond to specific software
commands to control the starting, reading, and
stopping of tape.
CONTROLS AND INDICATORS
The control panel of the TTU91 0 I is shown in
Figure 9-3. The TTU9l02 controls are the same
as the TTU9l 01, minus the paper tape unit.
Keyboard
The 'teleprinter keyboard is similar to a
standard typewriter keyboard (see Figure 9-4).
The keys are interlocked so that only correct
combinations may be pressed simultaneously.
Some of the ASCII keys are inscribed with words
such as FORM and EOT for control functions.
When a key is pressed it generates a printable
ASCII character.
Control Keys
The following paragraphs describe the control
keys used for normal teleprinter operation.
AT04
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