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|  MIL-D-81347C(AS)
3.5.1.4.3.5.7
TACCO Tray to TACCO Tray Logic
3.5.1.4.3.5.7.1
Signal Characteristics
(1) logical "1"= 0.0+0.5-0.0 Volt
logical "0" = open
(2) Switch Common - The switches and keyboard on the TACCO
Tray are wired as four groups. The Matrix Readout switches constitute one group, the Matrix Select
a second and the 68 Monofunction switches are divided into two groups. One group has 38 of the Mono-
function switches, the other has 30 Monofunction switches in addition to the Keyboard data. Four
switch common lines, one for each group, are provided to the TTL by the TACCO Tray. Whenever a
switch or key is depressed in a group, the switch common makes a transition from logical "l" to
logical "O". The switch common will remain a logical "0" until the operator releases the switch (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.
(3) Keyboard Enter - The TACCO Tray will provide one keyboard
enter (or data strobe) line to the TTL. The line will make the transition from logical "0" to logical
"l" whenever a key is depressed. The signal will remain for 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) Monofunction, Matrix Readout and Matrix Select Switches -
The TACCO Tray will supply one switch line to the TTL for each of the 68 Monofunction, 6 Matrix
Readout, and 36 Matrix Select switches. A switch line will make the transition from logical "O" to
logical "1" whenever the associated switch is depressed. The signal will remain a logical "1" 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.
(5) Keyboard Data - The TACCO Tray will supply six encoded
switch lines to the TTL for the keyboard. Whenever a key is depressed, the six-bit code identifying
the depressed key is presented on these lines. The code remains for a minimum of 50 milliseconds.
Up to 10 milliseconds of contact bounce noise may accompany the leading and trailing edges of the code
on the signal lines.
(6) Ground - All signals between the TTL and TACCO Tray shall
be referenced to the TTL signal return and the TTL signal shall be isolated from TACCO chassis and
airframe ground.
TACCO Tray Logic to TACCO Tray
3.5.1.4.3.5.8
Signal
Characteristics
3.5.1.4.3.5.8.1
(1) logical "1" = 3-6 volts, Drive = 2 MA
logical "0"= 0.0+0.5-0.0 Volts
(2) Matrix A, B, C, Background Illumination - The TTL shall
supply a background illumination control line to the TACCO Tray for each of the 36 Matrix Readout
switches. When a line is in the logical "l" state, message 12 (the colored background) will be illumi-
nated on the associated Matrix Readout switch. A logical "0" on the line will not illuminate message
12. The logical state of an illumination control line shall be under computer program control.
(3) Monofunction Background - The TTL shall supply a back-
ground illumination control line to the TACCO Tray for each of the 44 computer lit Monofunction
switches. When a line is in the logical "1" state, the colored background on the switch will be illu-
minated. A logical "0" on the line will not illuminate the colored background. The logical state of an
illumination control line shall be under computer program control.
34
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