u Wiring Diagram for Multiple ConnectionsFigure C.3 explains the wiring diagrams for multiple connections using BACnet communication.n MS/TP InterfaceCONTROLLER1234+-SHLDBypassS1OFFTB3SHLDTXRX-TXRX+IG51234BypassS1OFFTB3SHLDTXRX-TXRX+IG5ON1234BypassS1SHLDTXRX-TXRX+IG5BypassControllerBoard A2BypassControllerBoard A2BypassControllerBoard A2Figure C.3 Connection Diagram for Multiple ConnectionsNote: Turn on DIP switch S1 on the bypass that is located at the end of the network. If S1 is missing, then an external 120 ohm resistor must beplaced across terminals TXRX+ and TXRX-. All other slave devices must have this DIP switch set to the OFF position (or if S1 is missing,no external resistor is used).u Network TerminationThe two ends of the BACnet network line have to be terminated with a 120 ohm resistor between the TXRX+ and TXRX-signals. The Z1000 Bypass has a built in termination resistor that can be enabled or disabled using DIP switch S1. If a bypassis located at the end of a network line, enable the termination resistor by setting DIP switch S1 to the ON position. Disablethe termination resistor on all slaves that are not located at the network line end.Note: Some bypass controllers do not have DIP switch S1. If this is the case, then an external 120 ohm resistor must be placed across theTXRX+ and TXRX- signals if the bypass controller is at the end of a network line.C.3 Connecting to a NetworkYASKAWA ELECTRIC SIEP YAIZ1B 01E YASKAWA AC Drive – Z1000 Bypass Technical Manual 363C BACnetCommunications
