Transcription of BACnet MS/TP - kargs.net
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BACnet MS/TP - kargs.net
1 BACnet MS/TP Physical and Electrical considerations Packet structure Receive Frame State Machine Slave and Master Node State Machine Design issues (timing, buffering, MAC address) 2 BACnet MS/TP EIA-48512012051047K47K+5 RTSTxRx510+5 RTSTxRxRTSTxRx+++---Node with networkbias resistorsNode with localbias resistorsNode withoutbias resistorsBaud Rates: 9600, 19200, 38400, 57600, 76800 Parity: noStart Bits: 1 Stop Bits: 1 Least 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 Structure0x55 Preamble0xFFLengthDestination 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 4 Receive Frame State MachineIDLEDATACRCBad CRCGood CRCEatAnOctetEatAnErrorPreamble 1 TimeoutNotPreamblePREAMBLEE rrorHEADERCRCBadCRCNoDataNotForUsHEADERF rame TypeDestinationSourceLength 1 Length 2 DATAP reamble 2 CRC 1 Data OctetDataTimeoutErrorHeaderCRCT imeoutErrorRepeatedPreamble 1 CRC2 FrameTooLong 5 Master Node State MachinePOLLFORMASTERDONEWITHTOKENINITIAL IZEUSETOKENPAS
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
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