GE TermiNet 300 Programmer's Manual page 10

GEK-IS002 Programmer's Manual
020
021
022
when the horizontal tab option is present, at
w hi ch tim e the tab set farthest to the left is
defined to be the left-hand margin.
DATA
LINK ESCAPE (DLE)
DLE is used in combination with other codes
to provide the following capabilities:
020 004
DLE EaT - DISCONNECT -
LINE TURNAROUND OPTION
When recognized, these codes initiate the
automatic disconnect sequence by turning the
"Data Terminal Ready" signal to the
TT
Data
Set Off" until" Data Set Ready" is off. The
Terminal will also be placed in the "Standby"
mode.
020 077 DLE
? -
WAIT BEFORE TRANS-
l'v1IT - LINE TURNAROUND OPTION
Receipt of these codes constitutes a "Wait
Before Transmit" condition. These codes
will de-energize the "Ready" lamp. The
Terminal automatically responds to DLE
?
with the code ENQ.
DC1 - RDR "ON"
DCI is used when received to turn the tape
reader ON.
DC2 - PCR "ON"
DC2 is used when received to turn the tape
punch ON.
023 DC3 - RDR "OFF"
024
025
10
When this code is read from a tape, the
reader stops and DC 3 is not transmitted. If
restarted on this same code, the first char-
acter transmitted will be DC3. A DC3 from
the keyboard will not stop the local reader.
To stop a remote reader, use a "Break" or
"Interrupt. "
DC4 - PCH "OFF"
DC4 is used when received to turn the tape
punch OFF . .
NEGATIVE ACKNOWLEDGEMENT (NAK) -
LINE TURNAROUND OPTION
NAK results in "line turnaround". Receipt
of NAK has exactly the same effect as re-
ceiving "Break" or "Interrupt". That is, the
"Interrupt" light becomes illuminated and
the keyboard is deactivated.
If the line turnaround option is included
1
the
Terminal will indicate negative terminal
sta--
tus by NAK and positive or good status by
ACK when ENQ is received.
Negative terminal status will exist if the
Terminal is in any form of "Alarm" cohdi-
tion such as pape r out or tape out. ; See
MEANING AND EFFECT OF LIGHTS AND
SWITCHES for definition of "Alarm" condi-
tions.
033 ESCAPE (ESC)
ESC is used in combination with other codes
(by striking two keys simultaneously) to pro-
vide the following capabilities:
033 060
ESC 0
This code, when recognized, will cause the
paper tape reader to reverse if the reader
is stopped. The reader will reverse until a
stop code (023) or end-of-tape condition is
detected. If the paper tape hold-down lever
is up, the reader is deactivated and will not
respond to the code. If the tape reader is
reading when it receives the code, it will
continue until it reaches a stop code.. Then,
the reader will be immediately reversed.
The local tape reade r will act on this code
only if it is ON.
033 061
ESC 1 - HORIZONTAL TAB SET -
OPTION
If the horizontal tab option is present, rec-
ognition of ESC 1 will set a tab at the print
column position where this code
j
s recog-
nized.
033 062
ESC 2 - HORIZONTAL TAB CLEAR
- OPTION
If the horizontal tab option is present, rec-
ognition of ESC 2 will clear all tabs which
have been set.
033 072 *ESC: - ENABLE PRINT
ESC:, when received, will restore norlnal
print operation; that is, it viill restore the
condi tion caused by receipt of ESC:. This
is the normal condition in that data is printed
or punched, orboth, concurrently with either
transmitting or receiving. See ESC:.
033 073 *ESC: INHIBIT PRINT, ALLOW
TRANSMISSION
ESC;, when recognized, will separate locally
generated codes from the printer. This will
*
ESC:, ;, Hand J may be wired as a group to ope
r-
ate only when received.