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.
