Specifications
1747
Data
Set
Controller
Status
Bits
0=1
1=1
2=1
3=1
4=1
5=1
6=1
7=1
8=1
9=1
10=1
6-22
Status
Ready
Busy
Interrupt
Receive
and
full
Transmit
and empty
Alarm
Interrupt
word
received
Protected
Not used
Cyclic code
error
Receive and
not carrier-
on/off
Description
Bit
0 is present
when
the data
set
controller:
Detects the presence of
carrier-on/off and interlock
signals from the data
set
Is
not
in
test
mode
Is
ready for
an
address or
function selection
The
busy
status indicates that
the data set controller is
selected for a transmit or
receive operation or is trans-
mitting a response code.
The interrupt status indicates an
interrupt
from
the data set con-
troller
is
active. It clears
upon
receipt of a clear interrupt or
clear controller function code.
The receive and full status indi-
cates
the
data set controller has
assembled a data
word
for input
to the computer.
The transmit and empty status
indicates the data set controller
is ready
to
output another data
word.
The alarm status indicates a data
set
fault, .data set controller is
in
test
mode, or a cyclic code
error.
The interrupt
word
received
status indicates the data
set
con-
troller detected the interrupt
code word
(7622
8
),
The protected status indicates
the data set controller protect
switch
is
in
the protected posi-
tion.
The cyclic code error status indi-
cates the cyclic code check
detected a receive error. A
new
function code clears this status.
The receive
and
not carrier-
on/off status indicates a loss of
carrier after receipt of a sync
word and prior to termination of
a receive operation. It clears
Status
Bits
10=1
11=1
12=1
13=1
14=1
15=1
Status
Receive and
not carrier-
on/off
(Contd)
Transmit
and not
clear-to-send
Test
mode
Not carrier-
on/off or not
interlock
Sync
word/
interrupt
word
not
acknowledge
Not used
Description
upon
receipt of a select trans-
mit, select receive, or clear con-
troller function code or master
clear from the computer.
The
transmit and not clear-to-
send status indicates the data set
controller has lost the clear-to-
send signal from the data
set
during a transmit operation. It
clears
upon
receipt of a select
transmit, select receive, or clear
controller function code or
master clear from the computer.
The
test
mode
status indicates
the data
set
controller is
in
test
mode.
The not carrier-on/off or not
interlock status indicates loss of
data
set
carrier-on/off and inter-
lock signals.
The sync word/interrupt
word
not acknowledged status
indicates the local data set con-
troller received
no
response from
the remote data
set
controller.
(The
remote data
set
controller
must have a sync
word
acknow-
ledge circuit).
1751
Drum
Interface
and
Storage
Status
Bits
0=1
1=1
2=1
3
4=1
5
Status
Ready
Busy
Interrupt
Not used
End-of-
operation
Not used
Read
Write
Description
The
drum
is
operational.
The
drum is performing data
transfer.
Drum
interrupt response
Data transfer is complete.
The
data
was
not transferred to
memory before
new
data
was
taken from the drum.
Data
was
not received from
memory
in
time to be written
on
the drum.
96769450
A