
AUDIO INTERNATIONAL, INC. 11/97
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Document #540030, Rev. IR, Model No.: CTP-010 & CTP-010-01
2.4 Wiring Requirements
2.4.1 The installing agency must supply and fabricate all external cables. The
length and routing of external cables must be carefully studied and
planned before attempting installation of the equipment. Allow adequate
space for installation of cable and connectors. Avoid sharp bends and
placing cables near aircraft control cables. Maintain a minimum clearance
of three (3) inches from any control cable. If wiring is run parallel to
combustible fluid or oxygen lines, maintain a separation of six (6) inches
between the lines.
2.4.2 All power and ground wires must be 22 AWG minimum. All audio lines
require twisted, shielded cable with the cable shields properly grounded.
Power ground wires must be grounded within twelve (12) inches of the
unit. All wires must be in accordance with MIL-W-22759 or equivalent.
Twisted, shielded cable must be in accordance with MIL-W-27500 or
equivalent. Protect power wires with circuit breakers or fuses located
close to the electrical power source bus.
2.4.3 The CTP is designed to interface with other AI equipment via the RS-485
data bus. This is a bi-directional data bus that allows multiple units to be
connected simultaneously. The lines are daisy-chained between units with
120-ohm resistors installed at both ends of the wiring harness. Cable
designed specifically for data bus use with 120-ohm nominal impedance
should be utilized. Contact Audio International for recommended cables.
2.5 Physical Requirements
2.5.2 Refer to Section 5.0 for unit dimensions and attachment points.
2.6 Electrical Requirements
2.6.1 The CTP utilizes one 15-pin D-subminiature connector for electrical
connections. This connector provides 28 VDC, left/right audio output,
data bus control, infrared input, and four (4) strapping pins for alternate
configuration of infrared digital command codes. Refer to section 2.8 for
connector/unit connector information.
2.6.2 Standard configuration requires no strap pins to be connected. Each
different type of AI source equipment can be configured to accept one of
four (4) different sets of infrared codes. To change the code settings,
connect one (1) of the strap pins to the strap common (never connect more
than 1 strap pin to the strap common). Three (3) strap pins are available to
allow the infrared codes to be configured.