user manual
LMS-D24/26
LMS-D2X user manual
Page 11
Rear Panel Functions
Power Inlet
Audio Output
Connectors
Serial Comms
Port
Audio Input
Connectors
Secure Mode
Switch
Expansion
Port
• Power Inlet – provides connection to a suitable mains electricity supply using the cable
supplied. The controller has a switch mode power supply that is capable of operating with
a nominal mains voltage of 80 to 240v, 50/60Hz without re-configuration.
• Network expansion port – where a future network card can be fitted.
• Audio Input connectors – these are fully balanced and are wired pin 1 ground, pin 2 hot
and pin 3 cold. The two inputs have pin 1 connected directly to the chassis and feed the
signal processing chains. If an unbalanced source is used, a connection should be made
between the pin 3 ‘cold’ signal and the ground connection of the unbalanced source.
• Audio Output connectors – the processed outputs are impedance balanced, and are
wired pin 1 ground, pin 2 hot and pin 3 cold. An unbalanced input may be driven by by
connecting pin 3 ‘cold’ signal to the ground connection of the unbalanced destination
input. Note that output pin-1’s are ground lifted at audio frequencies but connected to
ground at RF for good EMC performance. The intention being that the amplifiers the
processor is driving should be responsible for the grounding of their input cable shields.
• Communications port connector – the unit may be controlled entirely from another
controller (typically a Personal Computer), running an application that is compliant with
the ObCom standard. Connection will normally be made to the controller via this serial
port connector. This port is also used for updating the firmware in the unit.
Note: The communications port is NOT disabled when the front panel is made secure using the
secure button.
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