Audio International, Inc. MSM2921-0x-x Installation
Document #540186, Rev. IR, 2/2000
Page 8 of 11
3.5
Physical Characteristics
3.5.1 Refer to Section 5.0 for unit dimensions.
3.5.2 Refer to Section 6.0 for attachment points.
3.5.3 When mounting the unit, allow sufficient space for mating
connectors.
3.6 Electrical Characteristics
3.6.1 Refer to Section 5.0 for electrical specifications.
3.6.2 Two connectors are available on the MSM2921-0x-x. P1 is a 9-pin
connector that provides for power, ground, RS485 data bus
commands, and device ID strapping pins.
Device ID pins are used to provide a unique address on AI’s
proprietary RS485 serial data bus. These are binary ID pins and
will allow up to twelve (12) MSM2921-0x-x modules to be installed
on the aircraft’s AI proprietary RS485 serial data bus. If more than
one unit is configured on the data bus, connect the respective
device ID pins to ID common.
3.6.3 P2 is a 50-pin connector with provisions for up to twelve (12)
+28 VDC power outputs, twelve (12) switch contacts (momentary
ground in), twelve (12) status ground outputs, and twelve ground
outputs.
Each power and ground output is capable of driving up to 80 mA at
+28 VDC. The status outputs have the capability to sink up to
50 mA at +28 VDC. The power rating for the unit is 50 mA at
+28 VDC.
3.7
Mating Connector Information
All wiring harnesses to the unit are supplied and fabricated by the
installing agency.
Model #
Pin #
Mating Connector
MSM2921-0x-1
P1
RD9F10JVL0
P2
RD50M10JVL0
MSM2921-0x-2
P1
DEMA-9S
P2
DEMA-50P
