DVD-9101-101-x Installation & Operation Manual
Document # 540311, Rev A, 10/2006
Page 10 of 27
3.4.6 RS-485 Data Bus Wiring
The DVD-9101-101-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
NEMA WC 27500
. The wire size for the
conductors in this cable shall
be 22 AWG, MINIMUM. Shield pins
are available for connecting data bus shields when required.
Refer to AI document 650007 for RS-485 Serial Data Bus design
architecture.
3.5 Physical Characteristics
3.5.1 Refer to Section 6.0 for unit dimensions and attachment points.
3.5.2 When mounting the unit, allow sufficient space for mating
connectors.
3.5.3 Chassis material is 6061-T6 aluminum, clear of anodization while
maintaining electrical conductivity to ground from any point on the
chassis via irridite treatment, gold, per
MIL-C-5541
.
3.5.4 This unit has an internal fan and ventilation holes in the chassis for
cooling. Installation recommendation requires 1-inch spacing from
other components and structures except the mounting surface for
which the unit should be in direct contact.
3.5.5 Bonding between chassis mounting point and airframe installation
to be <1
Ω
resistance using <50
Ω
impedance cable. No surface
prep is required due to conductive chassis finish (except front
bezel).
3.6
Clearance and Separation Requirements
When running cables, 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.
