accepted, but then rejected if issued to a line
not associated with an installed Autocall
Adapter.
2. By the common controls if an associated line is
issued the Break or Search command. The
Break or Search is not executed, but is ended
immediately.
This sense bit is never set for the Read, Write, Poll, Prepare, Wrap, Enable, Disable, Inhibit, or
Sense commands.
1-Bit--Intervention Required
If a Read, Inhibit; Poll; Write, or Prepare command
is being executed and the addressed line has a data
line set attached, this bit will be set:
1. If the data set has power off.
2. If the data set is not attached to the 2703.
3. If the data set is either "on-hook" or not in
data mode.
4. If the addressed line has a telegraph line
adapter that has not been enabled.
5. For the Read, Inhibit, and Poll commands
only, if a continuous Space signal is received
for one character time or greater.
6. While Dial is being executed, if the ACU (Automatic Calling Unit) Power Indicator is OFF. 7. Also if the ACU is not connected to the 2703.
This bit is never set under the Wrap, Enable,
Disable, and Sense commands.
4-Bit--Data Check
This bit is set:
1. During execution of the Read and Inhibit
commands if the line is in text-out mode and
a ® (negative reply) is received; it indicates
that the remote terminal reGeived data with
incorrect parity or LRC.
2. For the Read, Inhibit, and Poll commands if
the line is at Space at stop-bit time (2703 is
out of sync).
3. When the line is executing Write, Poll, or Wrap if a VRC error is detected in one of the
characters being transmitted.
4. If the line is equipped with the telegraph line
adapter and an echo chp-ck occurs.
5. During Read, Inhibit, or Poll when a VRC or
LRC error is detected.
6. If the response to a Poll command is not @ or ®. This sense bit is not set during the execution of
Dial, Prepare, Enable, Disable, or Sense.
32
7 -Bit--Timeout
This sense bit is set:
1. During the execution of the Read command if
no characters are received for a continuous
period of three seconds while the line is in
control mode. For text-mode operation, a
28-second timeout applies.
2. During the execution of Dial, if the ACU's ACR (Abandon Call and Retry) line turns ON. This indicates that the call was not established
in the allotted period of time and should be
redialed.
3. During a Poll command if no characters are
received for a continuous period of three
seconds when the receive-control bit is ON. 4. During the execution of a Prepare command if
a continuous Space signal has been received
for more than 28 seconds.
5. During the execution of Disable if a switched­
network data set does not go "off-hook" or "on­ hook" within 28 seconds after being signaled to
do so. That is, Data Set Ready does not turn OFF and end the Disable command within 28
seconds of the time that Data Terminal Ready
turned OFF. This sense bit is not set during execution of Write, Wrap, Break, Enable, or Sense.
IBM Terminal Control Type II
O-Bit--Command Reject
This bit is set during initial selection:
1. By the interface controls if a command that is
not defined or cannot be executed by the 2703
is presented. This occurs if the Dial command
is issued and the Autocall Adapter is not
installed in the 2703. The Dial command is
accepted but then rejected when issued to a line
not associated with an installed Autocall
Adapter.
2. By the common controls if an associated line
has been issued the Break or Search command.
The Break or Search is not executed but is
ended immediately.
This sense bit is never set for the Read, Write Poll, Prepare, Wrap, Enable, Disable, Inhibit,
or Sense commands.
1-Bit--Intervention Required
This bit is set when a Read, Inhibit, Poll, Write, or Prepare command is being executed and the addressed
line has a data line set attached: I
1. If the data set has power off.
2. If the data set is not in data mode.
3. For the Read, Poll, and Inhibit commands only,
if a continuous Space signal is received for
one character time or greater.
This bit is never set under the Wrap, Enable, Disable,
or Sense commands.
4-Bit--Data Check This bit is set:
1. During the execution of the Read or Inhibit
command if the line is in text-out mode and ® is received. It indicates that the remote
terminal detected a VRC error in the last block
of data received.
2. For the Read, Inhibit, and Poll commands if
the line is at Space at stop-bit time (the 2703 is out of sync).
3. When the line is executing Poll, Write, or
Wrap if a VRC error is detected in one of the
ch ... .racters being transmitted.
4. During a Read, Poll, or Inhibit when a VRC error is detected.
5. If the response to a Poll command is not © or ®. This bit is not set during the execution of the Dial,
Prepare, Enable, Disable, or Sense commands.
7-Bit--Timeout
This sense bit is set:
1. During the execution of the Read command if
no characters are received for a continuous
period of three seconds when the line is either
in control mode or its receive-control bit is OFF. Otherwise, the 28-second timeout
applies.
2. During the execution of Prepare if a continuous Space signal is received for a period of more
than 28 seconds.
3. During a Poll command if no characters are
received for a continuous period of three
seconds when the receive-control bit is ON. This sense bit is not set while the line is executing
Disable, Write, Wrap, Enable, Break, Inhibit, Sense, or Search. Telegraph Terminal Control Type I O-Bit--Command Reject.
This bit is set during initial selection by the inter­
face controls:
1. If a command that is not defined or cannot be
executed by the 2703 is presented. This occurs
if the Dial command is issued and the Autocall
Adapte r has not been installed in the 2703. The
Dial command is accepted but then rejected if
issued to a line not associated with an instal­
led Autocall Adapter.
2. If a Poll command is issued to a line controlled
by Telegraph Terminal Control Type 1. This sense bit w ill not be set during the execution of
the Read, Write, Prepare, Wrap, Enable, Disable,
Inhibit, Sense, Search, or Break commands.
1-Bit--Intervention Required
This sense bit is set:
1. To indicate that the addressed line has not been
enabled, if the Read, Inhibit, Write, Prepare,
Break, or Search command is being executed.
2. If a continuous Space signal is received for
one character time or greater during the
execution of Read, Inhibit, or Search. This bit is never set during the execution of the
Dial, Wrap, Enable, Disable, Poll, or Sense com­
mands.
4-Bit--Data Check This bit is set:
1. During the execution of Read, Inhibit, or Search if the line is at Space at stop-bit time.
2. During the execution of Write or Break if an
echo check occurs.
This sense bit is not set under the Dial, Prepare,
Enable, Disable, or Sense commands.
7 -Bit--Timeout
This sense bit is set:
1. During the execution of Read or Search if no
characters are received for a continuous
period of more than 28 seconds when the
receive-control bit is ON, or tw.o seconds if
this bit is OFF. 2. During the execution of Prepare if a continuous Space signal has been received for more than
28 seconds.
This sense bit is never set under the Write, Wrap,
Dial, Disable, Enable, Break, Inhibit, Poll, or Sense commands.
Telegraph Terminal Control Type IT O-Bit--Command Reject
This bit is set during initial selection by the inter­
face controls:
1. If a command that is not defined or cannot be
executed by the 2703 is presented. This
occurs if the Dial command is issued and the
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