In the Backbone with Studs technology, no studs should be left unconnected at the device end. The cable impedance should be within 100-120ohm range. A shielded twisted pair cable is the physical medium. Typically, one of the units is the client controlling the network traffic and prevents multiple drivers from being active at the same time (bus contention). Several types of network topologies are possible, but the daisy-chain bus configuration is the most efficient. no connection to the chassis ground as in 6200, 6300, 6100) on 7X50, 880, 8600) or to the isolated reference of the RS485 port (i.e. All devices with RS485 port have a shield terminal, which may be connected to the chassis ground (e.g. In all devices the RS485 ports are opto-isolated from the internal device electronics. Belden 3074F or equivalent cable may be used for applications greater than 300V which are indoors or outdoors in conduit above grade.Belden 9841 or Alpha 6412 or equivalent cable may be used for applications under 300V that are indoors or outdoors in conduit above grade.The National Electrical Code and all applicable local regulations must be followed when installing the communications wiring.

The 4 wire interface is usually implemented in order to avoid creating a T (tee) or star connections or to support full duplex connections.Ī twisted pair type of cable should be used in order to reduce radiated emissions and improve immunity of the communications system to any external electromagnetic interference.

In half-duplex implementation 2 wires are used this is the recommended configuration for most Schneider Electric PMC devices.Īll products manufactured by Schneider Electric PMC support half-duplex, 2 wire configuration.

This may be necessary for some applications involving legacy devices. Full duplex implementation requires 4 wires.

Modbus rtu wiring diagram