BACnet MS/TP - kargs.net
1BACnet MS/TP Physical and Electrical considerations Packet structure Receive Frame State Machine Slave and Master Node State Machine Design issues (timing, buffering, MAC address) 2BACnet MS/TP EIA-48512012051047K47K+5RTSTxRx510+5RTST xRxRTSTxRx+++---Node with networkbias resistorsNode with localbias resistorsNode withoutbias resistorsBaud Rates: 9600, 19200, 38400, 57600, 76800Parity: noStart Bits: 1Stop Bits: 1Least Significant Bit First (same as EIA-232)Uses standard UARTThis may not be the ideal circuit for EIA-485. There has been much debate in the BACnet MS/TP working group about it. 3MS/TP Packet Structure0x55Preamble0xFFLengthDestinati on AddressSource AddressFrame TypeHeader CRCDataData CRCpad2 octets, most significant octet first1 octet1 octet1 octet2 octets1 octet(present if Length is non-zero) Length octets(present if Length is non-zero) 2 octets(optional) at most, 1 octet0xFF 4Receive Frame State MachineIDLEDATACRCBad CRCGood CRCEatAnOctetEatAnErrorPreamble 1TimeoutNotPreamblePREAMBLEErrorHEADERCR CBadCRCNoDataNotForUsHEADERFrame TypeDestinationSourceLength 1Length 2DATAPreamble 2CRC 1Data OctetDataTimeoutErrorHeaderCRCTimeoutErr orRepeatedPreamble 1CRC2FrameTooLong 5Master Node State MachinePOLLFORMASTERDONEWITHTOKENINITIAL IZEUSETOKENPASSTOKENWAITFORREPLYIDL
2 BACnet MS/TP EIA-485 120 120 510 47K 47K +5 Rx Tx RTS +5 Rx TxRTS RTS + + + - - - Node with network bias resistors Node with local bias resistors Node without
Download BACnet MS/TP - kargs.net
Information
Domain:
Source:
Link to this page:
Please notify us if you found a problem with this document:
Related search queries
MS Node, Node Node Node Node Node Node Node, Current problems of hydrological networks, Current problems of hydrological networks design and optimization, Neural Network With MS Excel, Summary introduction to Wireless, Architecture and key business implications, SASCRO SASMO Congress 2017, Node, 3A, 55V DMOS Full-BridgeMotor Driver, Node Touchscreen Controller