3. During Read or Inhibit when a VRC error is
detected.
This sense bit is not set during the execution of Dial,
Prepare, Enable, Disable, orSense 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 receive
control bit isOFF. Otherwise, a 28-second
timeout applies.
2. During the execution of Dial if the ACU' s ACR
(Abandon Call and Retry) line turnsON. This
indicates that the call was not established in
the allotted time period and should be redialed.
3. During the execution of a Prepare command if
a continuousSpace signal has been received for
more than 28 seconds.
4. During the execution of Disable if a switched
network data set does not go "on-hook" within
28 seconds after being signaled to do so.
This sense bit is not set during the execution of
Write, Wrap, Break, orSense. START/STOP SPECIAL FEATURES The features described here pertain only to start/
stop type operation. However, the maximum allow
able features (see Figure 3) for a given configuration
is influenced by the feature mix for both start/stop
and synchronous in the areas of LineSets, 2712
Adapter, and Synchronous Clock; the "Feature
Limitations per2703" under "Special Features Summary" gives more detailed information.
Terminal ControlsOne terminal control is required, although as many
as six may be chosen (four start/stop and two
synchronous) for any2703 Transmission Control. One terminal control may service all terminals of
the same type. The following start/stop type terminal
controls are available for use.
IBM Terminal Control Type I
A maximum of one per2703 is permitted. This
feature allows for the attachment of:
IBM1050 Data Communication
IBM1060 Data Communication System IBM 1070 Process Communication System IBM 2740 Communication Terminal IBM 2741 Communication Terminal (without
Interrupt Feature)
IBM Terminal Control Type I also provides VRC
and LRC (vertical and longitudinal redundancy check
checking capabilities.
Type I Terminal Interrupt Feature
A maximum of one per2703 is permitted. The
Type I Terminal Interrupt feature provides the
necessary control for an IBM Terminal Control
Type I to operate with an IBM1050 or IBM 2741,
either equipped with interrupt features. The IBM
Terminal Control Type I is a prerequisite for the
Interrupt feature. The feature is program supported
by the Time SharingOption (TSO) of the System/360 Operating System.
Line adapter features in the2703 and communi
cations facilities are the same as those now required
for IBM Type I lines. Either full duplex IBM modems
or full duplex data sets are required to take full
advantage of the Type I Terminal Interrupt feature.
The Type I Terminal Interrupt feature allows the
IBM Terminal Control Type I to be used with1060, 1070, 2740, and 1050 or 2741 (without interrupt
features) terminals.
2741 Break Feature
A maximum of one per2703 is permitted. This fea
ture permits the IBM Terminal Control Type I to
operate with an IBM 2741 equipped with the Interrupt
feature, thus accommodating various time-sharing
applications utilizing the 2741. The IBM Terminal
Control Type I is a prerequisite.
This Break feature does not prohibit using the
IBM Terminal Control Type I for operation with1050, 1060, 1070, 2740, and 2741 (without Interrupt
feature) terminals.
IBM Terminal Control Type II
A maximum of one per2703 is permitted. This
feature allow s for the attachment of:
IBM1030 Data Collection System, except for the 1032 Digital Time Unit
Telegraph Terminal Control Type I
A maximum of one per2703 is permitted. This
feature allows for the attachment of:
AT&T 83B2/83B3 Selective Calling Stations
Western Union Plan 115AOutstations Telegraph Terminal Control Type II
A maximum of one per2703 is permitted. This
feature allows for the attachment of:
35
detected.
This sense bit is not set during the execution of Dial,
Prepare, Enable, Disable, or
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 receive
control bit is
timeout applies.
2. During the execution of Dial if the ACU' s ACR
(Abandon Call and Retry) line turns
indicates that the call was not established in
the allotted time period and should be redialed.
3. During the execution of a Prepare command if
a continuous
more than 28 seconds.
4. During the execution of Disable if a switched
network data set does not go "on-hook" within
28 seconds after being signaled to do so.
This sense bit is not set during the execution of
Write, Wrap, Break, or
stop type operation. However, the maximum allow
able features (see Figure 3) for a given configuration
is influenced by the feature mix for both start/stop
and synchronous in the areas of Line
Adapter, and Synchronous Clock; the "Feature
Limitations per
Terminal Controls
as six may be chosen (four start/stop and two
synchronous) for any
the same type. The following start/stop type terminal
controls are available for use.
IBM Terminal Control Type I
A maximum of one per
feature allows for the attachment of:
IBM
IBM
Interrupt Feature)
IBM Terminal Control Type I also provides VRC
and LRC (vertical and longitudinal redundancy check
checking capabilities.
Type I Terminal Interrupt Feature
A maximum of one per
Type I Terminal Interrupt feature provides the
necessary control for an IBM Terminal Control
Type I to operate with an IBM
either equipped with interrupt features. The IBM
Terminal Control Type I is a prerequisite for the
Interrupt feature. The feature is program supported
by the Time Sharing
Line adapter features in the
cations facilities are the same as those now required
for IBM Type I lines. Either full duplex IBM modems
or full duplex data sets are required to take full
advantage of the Type I Terminal Interrupt feature.
The Type I Terminal Interrupt feature allows the
IBM Terminal Control Type I to be used with
features) terminals.
2741 Break Feature
A maximum of one per
ture permits the IBM Terminal Control Type I to
operate with an IBM 2741 equipped with the Interrupt
feature, thus accommodating various time-sharing
applications utilizing the 2741. The IBM Terminal
Control Type I is a prerequisite.
This Break feature does not prohibit using the
IBM Terminal Control Type I for operation with
feature) terminals.
IBM Terminal Control Type II
A maximum of one per
feature allow s for the attachment of:
IBM
Telegraph Terminal Control Type I
A maximum of one per
feature allows for the attachment of:
AT&T 83B2/83B3 Selective Calling Stations
Western Union Plan 115A
A maximum of one per
feature allows for the attachment of:
35