Electro-Voice Speaker System - Manual (Page 17)

17 Owners Manual
Un-balanced Input / Output Connections
Un-balanced connections can be made to the DC-One, although induced noise
from cabling may be increased. Cables should also be less than 15” (5m) in
length. Unbalanced connections can be 6dB lower in level as well. To match
the audio level obtained with a balanced connection, it is necessary to tie pin
3 to ground at the XLR connector. This may increase noise.
RS-232
Two DC-Ones can be used in combination as a
Master / Slave for managing larger sound
reinforcement systems. A 9-pin D-sub connector is
provided on the rear of each unit for data line
connections. A standard female-to-female RS232
cable that conforms to the null modem wiring
convention is used to connect the two units. Cable
length should be kept to less than 45 feet (15m) for
the most reliable operation. These cables are readily
available at local computer dealers.
Operation of the DC-One 9-pin port for RS-232
connections is selected in the Setup menu.
Relay Contact Closure
The same 9-pin port used for RS-232
connection to another DC-One can
alternately be used to recall presets
from relay contact closures. Pins 1 – 8
are the input lines and pin 9 provides
the ground reference. When the DC-One
detects a connection between pin-9
ground and pins 1 – 8, as completed by
an external relay, a preset assigned by
the user to pins 1-8 is recalled into
memory and the DC-One returns to run-
time mode.