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END OF OPERATION
A teletypewriter End of Operation status is indicated by bit 04
of the station
1 Status Word being a logica 1 "I
II.
The End of Operation status bit is sent to
the Common Synchronizer from 23-C06-21.
For this bit to be a logical "1",
cycling of the controller Timing Chain (page 21) must
be complete.
This means
that another data transfer between computer and controller can occur.
ALARM
A teletypewriter Alarm status is indicated by bit 05 of the station 1 Status
Word being a logical "1".
The Alarm status bit is sent to the Common Synchronizer
from l7-C13-9.
For this bit to be a logical "1", either of the following
conditions exists:
(1)
the controller Ready FF (page 23) is clear, indicating that the LINE/
LOCAL/OFF switch is not in the LINE position.
(2)
the Lost Data FF (Z12 module, page 17) is set.
A lost Data condition
occurs in Read Mode when a second key is pressed before data generated
by the previous key has been transferred to the computer.
Information
from the second key is lost and the TTY goes into a Break condition.
LOST DATA
A teletypewriter Lost Data status is indicated by bit 06 of the station 1 Status
Word being a logical "1".
The Lost Data status bit is sent to the Common
Synchronizer from l7-C14-20.
For this bit to be a logical "1", the Lost Data FF
(212 module, page 17) is set.
PROTECTED
The teletypewriter is a non-protected device and, hence, status bit 07 will
always be a logical "0".
2-9
Rev. A
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