Switch ing Con trol Cir cuit
25
This controls the state of the three banks of relays and
the RUN lines to both Transmitters. The circuit has
inputs from the Selector switches on the DIU and the control
lines from the two Displays.
26
Indicators are provided to show the state of the three
banks of relays (LEDs are ON when the relay bank is
energised).
Status Cir cuit (Nu cleus 5000 & 6000 only)
27
Each Display receives two data and one select input
which control and request status information from the
DIU as shown below. This is provided via two status lines to
each Display.
Con trol Sig nals
28
Outputs from each Display:
(1) Change control of Transmitter (this is normally at
0V and goes high for approximately 100ms to
change over the control of the Transmitters).
(2) Display Own (0V) or Other (+12V) Transmitter
radar data.
(3) Input data selector (0V or +12V).
29
Inputs to each Display with Input data selector = 0V:
Line 1 Local = 0, Remote = 1
Line 2 Straight = 0, Crossed = 1
30
Inputs to each Display with Input data selector = 12V &
Remote
0,0 = Other Tx is OFF
0,1 = Other Tx is STANDBY but NOT READY
1,0 = Other Tx is STANDBY and READY
1,1 = Other Tx is RUNNING
31
Inputs to each Display with Input data selector = 12V &
Local
Line 1 Master = 0, Slave = 1
Line 2 Connected to Own = 0, Other = 1
Sync Pulse Cir cuit
32
A Sync Pulse Circuit, comprising a presetable Delay
Line and associated Buffer, is provided for each
Transmitter.
33
Transmitter SYNC pulses are delayed by up to 350ns
through a Sync Delay Line, and then passed to a
Buffer. The buffered SYNC pulses are then passed via the
Display A or B Relays and subsequently split to provide a
SYNC pulse to the selected Display, and a BLANK pulse to
the other Display (if required).
Video Sig nal Cir cuit
34
A Video Signal Buffer is provided for each Transmitter.
35
Transmitter VIDEO signals are terminated and then
passed via the Display A or B relays to the selected
Video Buffer, one for each Display.
OP ERA TION
36
The Interswitch Unit has two control switches, refer to
Figure 2b, located on the top face which provide the
following facilities:
(1)
TRANSMITTER CONTROL SELECTOR
CROSSED/UNCROSSED (two position switch) -
determines which display controls which
Transmitter when in LOCAL operation.
(2)
DISPLAY CONTROL SELECTOR
SLAVE A/MASTER/SLAVE B/REMOTE/TEST
(five position switch - determines the Interswitch
mode and connections in one of the local
positions.
LO CAL MODE
37
The Local Interswitch mode of operation is as follows:
DISPLAY CONNECTION SELECTOR
Position 1 - SLAVE A
; both Displays are connected to
Transmitter A. If the Transmitter Control Selector
switch is in the UNCROSSED position then Display A
controls Transmitter A, if in the CROSSED position
then Display B controls Transmitter A.
Position 2 - MASTER
; if set to this position the mode
of operation is as set by the Transmitter Control
Selector.
Position 3 - SLAVE B
; both Displays are connected to
Transmitter B. If the Transmitter Control Selector
switch is in the UNCROSSED position then Display B
controls Transmitter B, if in the CROSSED position
then Display A controls Transmitter B.
Position 4 - REMOTE
; on power up the system is
connected as previously configured before power was
turned off. Each display retains its configuration and
the first display switched on determines the initial state.
Position 5 - TEST
; used for Fault Finding purposes
only, isolates most of the Interswitch circuits so that
Straight Through operation only is selected.
Original
8b.5
May 01
KH 2020
Chap 8b
CAUTION
Before selecting REMOTE ensure that the
Display(s) is/are switched to STANDBY.
Summary of Contents for Kelvin Hughes Nucleus 3 5000 Series
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