SCD-012-01-x Installation & Operation Manual
Document # 540106, Rev B, 06/2001
Page 10 of 16
4.0
Wiring Requirements
4.1
Introduction
The installing agency must supply and fabricate all external cables. The
length and routing of external cables should 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.
4.2
Power Wires
All power and ground wires shall be 22 AWG, MINIMUM. Power ground
wires shall be grounded within twelve inches of the unit. All wires shall be
in accordance with the standard military specification of MIL-W-22759 or
equivalent.
Twisted, shielded cable shall be in accordance with the
standard military specification of MIL-DTL-27500 or equivalent. Protect
power wires with circuit breakers or fuses located close to the electrical
power source bus.
4.3
AI’s Proprietary RS-485 Data Bus
4.3.1 The SCD-012-01-x is designed to interface with other Audio
International equipment via AI’s proprietary RS-485 serial data bus.
The data bus shall be implemented using a twisted shielded pair
cable in accordance with the standard military specification of
MIL-DTL-27500 or equivalent. The wire size for the conductors in
this cable shall be 22 AWG, MINIMUM.
The shield shall be
connected everywhere a shield pin is provided. Shield terminations
shall be made as close to the connector pin as possible.
4.3.2 All modules on AI’s proprietary RS-485 data bus shall be connected
in a ‘daisy-chain’ configuration. AI’s proprietary RS-485 data bus
specification is available upon request.
5.0
Physical Characteristics
5.1
Refer to Section 9.0 for unit dimensions and mounting hole sizes.
5.2
When mounting the unit, allow sufficient space for mating connectors.
