Expansion Module/Plato Interface Signal Routing - Control Data Corporation INFORMATION SYSTEMS TERMINAL II Hardware Maintenance Manual

TO/FROM OPTIONAL MODULE (AJ5)
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RECEIVE DATA
:
DSR
TO RECEIVER
AND
CARRIER DETECT
:
4
MH
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CLOCK
FROM
FORWARD
t
TRANSMITTER
- - - 0 - -
:
REVERSE
!
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~
PLATO INTERFACE
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..
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SWITCH
CONTACTS
CONTROLLER BOARD
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TO/FROM
PLATO
SYSTEM
(RJ I)
03H3
TO/FROM FRONT PANEL (AJ4)
Figure 4-22. Expansion Module/PLATO Interface Signal
Routing
• Transmitted Data - This signal is the output of the
PLATO interface shift register. Levels are TTL com-
patible. The signal is a TTL high when idle
(marking state). Data rates are switch selectable
at 1200, 120, and 75 bps.
• Received Data - This signal carries information to
the, PLATO interface receiver. Voltage levels can be
TTL or RS-232-C. The marking state is defined as
either a TTL or RS-232-C off (Vin
=
+0.8 V). The
data rate of this signal must be 1200 bps.
82100083 4-47