User's Manual
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 4−16
15 Dec 2005
Table 4−1. TCAS 3000 Computer Unit Loading/Gradient Specifications (cont)
Connector Pin
Designation
Functional Description
RBP−7A Audio Level Program Pin No. 1 (NO)
Two synthesized voice outputs with programmable output levels are provided by the
TCAS computer unit. The output at RMP−2F and −2G supply high level (up to 4 Watts)
audio signals to an 8 ohm speaker. The second output at RMP−3F and −3G supply low
level (up to 80 milliwatts) audio signals to a 600 ohm audio distribution system. All aural
traffic and resolution advisories can be annunciated over these outputs unless cancelled
by a Cancel Discrete (RMP−3D).
Listed below are the audio level program pin configurations and the resulting output
levels:
Program Pin
RBP−7A RBP−7B RBP−7C Low Level Output High Level Output
(MSB) (LSB) dBm mW dBm W
Open Open Open 16 40 6 4
Open Open Ground 13 20 3 2
Open Ground Open 10 10 0 1
Open Ground Ground 7 5 −3 0.5
Ground Open Open 4 2.5 −6 0.25
Ground Open Ground 1 1.25 −9 0.125
Ground Ground Open −2 0.625 −12 0.0625
Ground Ground Ground 19 80 Not Used Not Used
RBP−7B Audio Level Program Pin No. 2 (NO)
See RBP−7A.
RBP−7C Audio Level Program Pin No. 3 (NO)
See RBP−7A.
RBP−7D Audio Tone Enable Program Pin (NO)
If this programming pin is connected to program common, (RBP−7K), all voice
announcements are delayed by one second and are preceded by a tone. If pin is left
open, no delays or tones occur.
RBP−7E Ground Display Mode Program Pin (NO)
The TCAS computer unit monitors this programming pin to select the TCAS ground
display mode while the aircraft is on the ground. If the aircraft is on the ground and this
pin is connected to program common (RBP−7K), TCAS goes into standby mode. If this
pin is left open and the aircraft is on the ground, TCAS displays traffic only. Aural and
voice annunciations are inhibited while the aircraft is on the ground.
NOTE: TCAS does not display any traffic that it locates on the ground. TCAS aircraft
has WOW and intruder aircraft reports the same altitude or a lower altitude.
RBP−7F Display All Traffic Program Pin (NO)
The TCAS computer unit monitors this program pin to select either the all traffic display
mode or the TA/RA only mode. If this pin is open, all traffic is displayed. If this pin is
connected to program common (RBP−7K), the TCAS displays only TA/RA type intruders.