Logic Digital Controller
User Guide version 3
Page 12 of 31
Audio Output Connectors
The processed outputs are impedance balanced, and wired pin-1 ground, pin-2 hot and pin-3
cold. An unbalanced input may be driven 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
Logic System Digital series processor 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 that the communications port is NOT disabled when the front panel is made secure using
the secure button.
