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Universal Keyset to Universal Keyset Logic |
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|  NHL-D-81347C(AS)
Universal Keyset to Universal Keyset Logic
3.5.1.4.4.5.7
Signal Characteristics
3.5.1.4.4.5.7.1
(1) logical "1"= 0 + 0 . 5 - 0 . 0 v o l t
logical "0" = open
(2) Switch Common- The switches on a Universal Keyset shall
be wired as one group. A switch common line shall be provided for the group. Whenever a switchis
depressed, the switch common shall make a transition from logical "1" to logical "0". The switch
common signal shall remain a logical "O" until the operator releases the switch (a minimum of 50 milli-
seconds). Up to 10 milliseconds of contact bounce noise may be present on both the leading and trailing
edges of the signal.
(3) Matrix, Matrix Select, Keyboard, and Monofunction Switch -
A Universal Keyset shall supply one switch line to the UKL for each of the 8 Matrix, 8 Matrix-Select,
10 Keyboard, and 11 Monofunction switches. A switch line shall make the transition from logical "O"
to logical "l" whenever the associated switch is depressed. The signal shall remain a logical "l" until
the switch is released (a minimum of 50 milliseconds). Up to 10 milliseconds of contact bounce noise
may be present on both the leading and trailing edges of the signal.
(4) Ground - All signals between the UKL and the Universal Key-
set shall be referenced to the UKL signal return. The UKL signal return shall be isolated from the
Keyset chassis and air frame ground.
3.5.1.4.4.5.8
Universal Keyset Logic to Universal Keyset
3.5.1.4.4.5.8.1
Signal Characteristics
(1) logical "1" = 3 - 6 volts, Drive = 2 MA maximum
logical "0" = 0 + 0 . 5 - 0 . 0 v o l t
(2) Message Selection Codes for PRO's 1 through 9- The UKL
shall supply four message selection code lines to the Universal Keyset for each of PRO's 1 through 9.
The four bit code on each set of select lines shall determine the message to be displayed on the asso-
ciated PRO.
(3) Selection of Function Messages to be Displayed on Matrix
Readout Switches - The UKL shall supply four message combination selection lines to the Universal
Keyset. The four bit code shall determine the combination of function messages to be displayed on the
Matrix Readout switches. The four bit code shall also cause that Matrix Select switch with a legend
describing the combination of function messages currently being displayed on the Matrix Readout
switches, to be illuminated with a colored background.
(4) Monofunction and Matrix Background Illumination - The
UKL shall supply a background illumination control line to the Universal Keyset for each of the eight
Matrix and eight computer lit Monofunction switches. When a line is in the logical "1" state, the
colored background on the switch shall be illuminated. A logical "O" on the line shall not illuminate
the colored background. The logical state of an illumination control line shall be under computer pro-
gram control.
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