Understanding Smart Sensors - Nomads.usp

142 Understanding Smart Sensorsmessage validation, error detection, and default values are all defined for theMI-Bus.6.8.5 Other MCUs and ProtocolsThe Profibus protocol is available in RAM microcode in a number of semiconductordevices. One single-chip local area network (LAN) solution has beendeveloped to interface Ethernet and a variety of different sensor networks,including Profibus [27]. As shown in Figure 6.12, network nodes can be connectedto an Ethernet hub using twisted-pair cables. The MC68360 in thisapplication has a 32-bit CPU that provides 4.5 MIPS at 25 MHz for power andflexibility in any existing Ethernet system. Because Ethernet is the leadingnumber of installed LANs, interoperability is essential.6.9 Other Aspects of Network CommunicationsIn addition to the protocols already discussed, MCU manufacturers use serialcommunications protocols between ICs that are on the same printed circuitboard. Those interfaces can also be considered for subsystems in communicationsnetworks. When MCU protocols or any of the previously discussedSimplified industrial EthernetAs hubs integrate more functions,processors and software are addedSimple hardware hubsMedium-speedconductorEthernet10Base-T hubTwisted-pair mediaat 10 MbpsEthernet andProfibusinterfaces andcontrolHandlesProfibusSensornodesSensor networkFigure 6.12 Ethernet and Profibus interface.