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Hi! I'm not very familiar with Orocos, but are you sure that you are using ROSARIA to connect to the robot? USB to serial is the default in ROSARIA (/dev/ttyUSB0) and you can change it using port parameter, e.g. rosrun ROSARIA RosAria _port:=/dev/ttyUSB1 in case you have something else on /dev/ttyUSB0.

If you are using Aria library directly (from Aria metapackage), take a look at RosAriaNode::Setup() method:

ArArgumentBuilder *args;
args = new ArArgumentBuilder();
args->add("-rp"); //pass robot's serial port to Aria
args->add(serial_port.c_str());
// left out irrelevant code
conn = new ArSimpleConnector(args);
// left out irrelevant code
// Connect to the robot
if (!conn->connectRobot(robot)) {
  ArLog::log(ArLog::Terse, "rotate: Could not connect to robot! Exiting.");
  return 1;
}