AUDIO INTERNATIONAL, INC.
2/98
8
Document #540067, Rev. IR, Model No.: RCD-02x-x & RCD-020x-40x
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 24 AWG minimum. All audio lines
require twisted, shielded cable with the cable shields 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 RCD-020-40x and RCD-021-40x are designed to interface with other
AI equipment via the proprietary 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
2.5.1 Refer to Section 5.1 for unit dimensions and mounting attachment points.
2.6 Electrical
Requirements
2.6.1 The RCD-020-1 and RCD-020-401 each utilize one 21-pin positronic
connector for electrical connections. This connector provides 28 VDC,
left/right audio output, infrared input, antenna high, antenna shield, 12
VDC battery holdup, and four (4) strapping pins for alternate
configuration of infrared digital command codes. It also provides data bus
control for the RCD-020-401.
2.6.2 The RCD-020-2 and RCD-020-402 each utilize one 21-pin D-
subminiature connector for electrical connections. This connector
provides 28 VDC, left/right audio output, infrared input, antenna high,
antenna shield, 12 VDC battery holdup, and four (4) strapping pins for
alternate configuration of infrared digital command codes. It also
provides data bus control for the RCD-020-402. Refer to Section 2.8 for
connector/unit connector information.
