Eaton Cutler Hammer MN05001002E Installation Manual

Intelligent Technologies QCPort System Install ManualNovember 2005MN05001002E For more information visit www.eatonelectrical.com Page 16Using Biasing ResistorsDepending on the type of QCPort system being implemented, biasing resistors may ormay not be required. For Figure 1 and Figure 2 under the “Interconnectivity UsingQCPort” section (One Device Using QCPort), a single biasing resistor is required whenthe total length of the system is less than 3 feet [1 meter].When connecting a Network Adapter to IO and motor controllers, as in Figure 3 MultipleDevices Being Controlled And Monitored Remotely Using QCPort, biasing resistors arerequired on the end furthest from the network Adapter. A biasing resistor is not requiredon the one end that the Network Adapter is located since the Network Adapter has abiasing resistor integral.When a biasing resistor is required, use part # D77E-TERRJ or D77E-QPLR. Thesebiasing resistors connect between A and B and require 24V DC present on QCPort to befunctional. The D77E-QPLR has three connections to QCPort. They are through the RJconnectors at the bottom, the Backplane connector on the back, and then through thefront connector at the A and B terminals. The D77E-TERRJ has only one way to connectto QCPort, which is through the RJ connectors. There are two connectors that are inparallel with each other so it is not important which way the biasing resistor is orientated.Figure 10: QCPort Biasing Resistor OptionsD77E-TERRJD77E-QPLRP-P+ABP-P+-+-+-+AuxPowerQCPortCom24V DC