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pushbutton, when depressed, resets the relay.
When the pushbutton is released,
the function relay returns to the state dictated by the patch panel inputs.
If
the patch panel inputs are not patched they remain in the state selected by the
pushbuttons.
Consequently, with no logic signals patched to its inputs, the
function relay can be used as a manual function switch controlled by its asso-
ciated pushbuttons.
1.5.3
The Handset ATTENUATORS
Ten handset ATTENUATORS (POO to P09) are provided on the auxiliary control panel.
Each ATTENUATOR is addressable on the signal selector system and is set in a
manner similar to the servo set attenuators except that they are manually ad-
justed.
Set each ATTENUATOR to the desired value using the DVM as a readout
. device.
If the computer does not contain a DVM, the ATTENUATORS have to be set
using the nulling method on the VOLTMETER.
1.6
THE LOGIC CONTROL AND INDICATOR PANEL
The logic control and indicator panel (Figure 1.14) is located at the upper
left of the analog patch panel.
The panel contains the digital patch panel,
AND gate indicators, the REGISTER indicators and pushbutton controls, the in-
dicators and thumbwheel controls for the COUNTERS, the general purpose PUSH-
BUTTONS and repetitive operation TIME controls (A and
A).
The operation of the
various controls and indicators mentioned above are described in the following
paragraphs.
1.6.1
The Digital
Patc~
Panel
The digital patch panel (Figure 1.15) is used to provide access to the inputs
and outputs of the logic devices in the logic package.
Physically the logic
patch panel is divided into four fields (0 through 3) and three trunk areas
(0 through
2).
Each of the fields and trunk areas are similar in layout.
The
particular patching areas and the patch termination functions are described
with their associated units.
1.6.2
The AND Gate Display
The AND gate display is provided to indicate the output state of each individual
AND gate.
When the indicator is lit, the output of the gate is high.
The in-
dicator is numbered and lettered to correspond to the gates, and in addition,
is laid out in the same configuration as the terminations on the patch panel.
1.6.3
The REGISTER Controls and Indicators
A fully expanded 580 Computer logic package contains four registers of four
bits each for a total of 16 flip-flops.
A numbered pushbutton and the adjacent
blank pushbutton are provided as manual controls and indicator for each flip-
flop.
The numbered pushbutton lights when the flip-flop is set and is extin-
guished when cleared.
The numbered pushbutton also serves as a manual control;
depressing it sets the flip-flop.
The blank pushbutton is not used as an in-
dicator but serves as a manual clear control for its associated flip-flop.
1-25
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