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INTER-MACHINE COMl\!IUNICATION
•
The 1132 printer receives most of its operating
voltages from the using system.
•
Signals from the using system to the 1132
printer control carriage and print operations.
•
Response signals sent to the using system from
the 1132 printer indicate conditions in the
printer.
Voltage Lines to the 1132 Printer
AC Voltage. Line voltage from the using system is
supplied to the 1132 blower and convenience outlets.
When the C. E. switch is on and the 1132 sequencing
relays are picked, line voltage is supplied to the
drive motor and a power transformer. One output
of this transformer provides voltage for the timing
disk lamp. The other transformer output is recti-
fied and filtered to provide 48 vdc used in carriage
motor and magnet circuits and in 1132 print magnet
circuits.
Sequenced AC Voltage. When the sequencing relay in
in the using system is picked, sequenced voltage
from the system picks printer sequencing relays.
DC Voltages. The using system supplies +12 vdc,
+6 vdc, +3 vdc, and -3 vdc for circuits in the 1132.
Signal Lines to the 1132 Printer
These lines from the using system are called
Printer Entry Lines.
Forms Indicator. This line activates a lamp driver
which lights the Form Check light.
Ready Indicator. This line conditions a lamp driver
which lights the Ready light.
Motor On Indicator. This line conditions a lamp
driver which lights the Power On light.
Print Scan Error. This line conditions a light
driver, which lights the Print Scan Check light.
CHAPTER III THEORY OF OPERATION
Interposer Magnet Select. This line conditions a
magnet driver which energizes the interposer
magnet.
Carriage Magnet Select. This line conditions a mag-
net driver which energizes the carriage magnet.
Use Meter Select. This line causes current flow in
the use meter coil.
Print Buffer 0 through 15. When active, each of
these lines indicates a character in the using system
print buffer. Each line is an input to one of a group
of 16 AND circuits in the 1132.
Print Gate. This line is active as a result of a using
system print instruction. It is common to all of the
16 AND circuits previously mentioned. The outputs
of the AND circuits which have both inputs active
are print bit 0 through 15 lines.
Print Select Group 0 through 7. These lines are
made active sequentially by the using system group
counter circuits. Lines 0 through 6, when active,
each condition a group of 16 AND circuits in the
1132. Line 7 conditions a group of 8 AND circuits.
Signal Lines from the 1132 Printer
These lines, supplying responses to the using sys-
tem, are called Printer Exit Lines.
Forms Contact. This line is controlled by the n/o
forms contact points. Because it is considered nor-
mal to have forms in position to print, the n/o con-
tact is open under this condition. The line now
allows development of a ready condition in the using
system. Without forms in position, the normally
open contact closes, and the line blocks the ready
condition. The line returns to the 1132 and activates
the forms indicator line.
Start Key.
A
capacitor is charged through the Start
key's normally closed contact. When the key is
pressed, the capacitor discharges through a voltage
divider network via the normally open contact. Be-
cause the capacitor can recharge only through the
normally closed contact, the line is activated once
3. l
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