DeCrane Aerospace Audio International
DVD-9101-201-x Installation & Operation Manual
Document # 540339, Rev A, 02/2008
Page 9 of 24
3.4
Wiring Requirements
3.4.1 Introduction
The installing agency shall supply and fabricate all external cables.
The length and routing of external cables shall be carefully studied
and planned before attempting installation of the equipment. Allow
adequate space for installation of cable and connectors.
3.4.2 Power Wires
All power input and power ground connections to the unit must be
22 AWG (minimum) using shielded
M27759
. This unit provides for
common circuit ground and chassis ground connections. Both
circuit and chassis grounds are referenced to pin 2 of connector
P1. Circuit/chassis ground connection shall be bonded to an
electrically conductive chassis mounting point or frame ground with
less than 0.001 resistance using less than 50 impedance
cable.
3.4.3 Video Lines
All serial digital video wiring connections are recommended to use
PIC V76261
shielded coax. Serial digital video provided in SMPTE
259M format.
All connector types shall be compatible with above-
listed wiring requirements.
3.4.4 Serial Digital Audio Wiring
All digital audio wire connections must be twisted shielded cable
with the shield properly grounded to the dedicated pin at the source
end to the dedicated pin at the load end. Twisted shielded cable
shall be 22 AWG (minimum) for digital audio signals and shall be in
accordance with
NEMA WC 27500
.
3.4.5 RS-485 Data Bus Wiring
The DVD-9101-201-x is designed to interface with other DeCrane
Aerospace Audio International equipment via DAAI’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 DAAI document 650007 for RS-485
serial data bus design architecture.