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The ISOLATED / GROUNDED switch located on the UCC1's front panel allows bridging this
galvanic isolation putting the CAN-bus of the UCC1 on circuitry ground potential.
The CAN-bus should normally be referenced to the ground potential at one single point in the
network. Set the switch to its GROUNDED-position when only one UCC1 is used in a single CAN-
bus network. When employing several UCC1s in a CAN-bus network, setting the ISOLATED /
GROUNDED switch of one UCC1 to GROUNDED while leaving the switches of all other UCC1s in
the ISOLATED-position is recommended.
5. Monitor Bus
Next to the CAN-bus signal, network cabling also holds the balanced audio-monitor signal for
monitoring the power amp inputs and outputs. This monitor-bus allows software-controlled
monitoring of the input and output signals of all power amps that are included in the remote network,
without the need for additional wiring. The monitor signal is present at the UCC1's XLR-type
MONITOR Output connector for further distribution to (e.g.) a mixing console to be monitored via
headphones or an active monitor speaker connected.
6. Technical Information
6.1 The UCC1 USB-CAN Converter
The UCC1 is an USB-to-CAN adapter, which offers the possibility to easily include any PC or
Notebook computer that is equipped with an USB-port in an existing CAN-network. The USB driver,
which is part of the IRIS-software is the only thing needed for triggering. The UCC1 gets its power
supply from the PC's USB-port, so that no external power supply unit is necessary.
The following block diagram shows the UCC1's internal structure with USB-port and controller on the
one side and the CAN-bus interface with CAN-transceiver component and galvanic separation on the
other side. The controller is responsible for the data format conversion between USB-port and CAN-
bus, allowing data rates of up to 500 kbit/s.
Next to the CAN-bus, the network cabling also holds the monitor bus, which serves for monitoring the
input or output audio signals of all amplifiers that are included in the network. This audio signal is
present at the UCC1's XLR-type MONITOR Output connector to provide trouble-free connection to a
mixer input or an additional amplifier.
USB
DATA
ISOLATED
GROUNDED
The CAN-bus port of the UCC1 (CAN BUS IN / OUT) is carried out via two Neutrik EtherCon
connectors to ensure most secure and reliably safe RJ-45 connections even under most wearing
conditions. The EtherCon connector series has been specially designed for use in ProAudio and On-
Stage applications. Matching Neutrik plug-type – NE8MC – connectors are also available.
USB & CAN
CONTROLLER
ISOLATION
CAN
USB
GND
GND
Fig. 7: UCC1 Block Diagram
CAN
TRANSCEIVER
CAN
GND
2
1
3
23
IN
CAN BUS
CAN Bus
OUT
Monitor Bus
MONITOR
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