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|  MIL-N-85005A(AS)
3.5.6.4.1.2
Track Ball Channel - The Track Ball pulse train
shall be output to the SDC from the TDC. Four sets of buffered complementary
pairs shall be provided, one each for the +X, -X, +Y, and -Y outputs. Pulse
width shall be nominally 250 ns.
Converter Interface - The TDC shall interface directly
3.5.6.4.2
with the Converter receiving logic power and LED illumination, LED display
data, and 28 V power for panel lighting.
3.5.6.5
Controls - The TDC shall contain PBI's and a Track Ball.
Depression of any of the PBI's except LAMP TEST shall cause the associated
function code Figure 32 to be generated in the TMEC word that is then trans-
mitted to the computer subsystem. The formulation and transmission of the
TMEC word shall be such that a new TMEC word, resulting from rapid depres-
sion of a second PBI, is inhibited until the old TMEC word is input completely
to the computer. Positional configuration and labeling of the controls shall
be as depicted in Figure 30. The PBI's shall have opaque fields with
illuminated legends.
LAMP Test actuation shall energize and illuminate all
PBI's amber, all LED segments to "8", and all other indicators to an "on"
state.
*3.5.6.5.1
Keysets - The TDC shall contain 39 PBI's as listed by
label and type. PBI type 1 shall be momentary action, illuminated normally
green, changing to amber when depressed. PBI type 2 shall be momentary
action, illuminated green, changing and remaining amber when depressed,
returning to green illumination when reset by depression or by ENTER PBI
activation. PBI type 3 shall be alternate action, illuminated amber when
activated "on" and green when deactivated "off". PBI type 4 shall be
momentary action, illuminated green, when activated "on" flashes amber
at 1 to 3 Hz rate under NC control. Spares shall not be labeled and
shall be opaque.
Note: A permissible alternative shall be to have the
12 keys in the decimal keyset and the 3 scale keys normally illuminated
green only.
TYPE 1
0 through 9
ENTER
CLEAR
SPARE 4
LAMP TEST
RCTR HOOK
and
32 MILE
TYPE 2
FLY-TO
MKR TYPE
DISP MKR
MARK ACFT
SPARE 3
CLEAR MKR
DSTR MKR
PRED
DROP MKR
PLACE CURS
MARK HOOK
TGT POS
TYPE 3
CURS ORIG
SPARE
2
TGT TRK
CIRC ORIG
WAY PTS
BITE 2
ACFT CURS
TYPE 4
BIAS RJCT
BIAS ACCPT
Flashes amber at 1 to 3 Hz rate.
Interlocked with CIRC ORIG and ACFT CURS.
Interlocks shall preclude more
Interlocked with CURS ORIG and ACFT CURS.
than one function code to
Interlocked with CURS ORIG and CIRC ORIG.
be active at any one time.
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