Siemeca AMR â¢ Network Node WTT16/WTX16 M-Bus ... - Armatec AB

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2 References [1] EN60870-5-2 Telecontrol equipment and systems – Part 5: Transmission protocols, Main Section 2: Link transmission procedures [2] EN13757 – 2 Communication systems for remote reading of meters – Part 2: Physical and link layers [3] EN13757 – 3 Communication systems for remote reading of meters – Part 3: Dedicated application layer [4] EN13757 – 4 Communication systems for remote reading of meters – Part 4: Wireless meter readout (radio meter reading for operation in the 868 MHz to 870 MHz SDR band) [5] EN1434 – 3 Heat meters – Part 3: Data exchange and interfaces [6] Data Sheet „Siemeca AMR Remote Meter Readout System – Data Points of Meters“ Internet download: An older version of [2] is available at: http://www.m-bus.com/files/W4A21021.pdf, while an older version of [3] can be downloaded from: http://www.m-bus.com/files/W4B21021.pdf. 10/56 For intra-company use only Siemens M-Bus Spezifikation Building Technologies References 09.03.2007
3 The Network Node Radio and M-Bus Devices The network node (without gateway) is a system device whose job it is to receive and store the data from radioing meters and to make them available for the readout process. M-Bus virtual M-BUS Since the M-bus is a pure master-slave bus, which does not allow messages from the slave to the master to be sent spontaneously, the data received via radio are stored. The M-bus master is in a position at any time to call up a copy of the data. As a general principle, an M- bus master cannot access the radio channel directly. In order to make the stored radio device accessible to the M-bus master, the network node simulates the existence on the bus of each radioing meter received as a "real" M-bus device. Consequently, the M-bus master addresses the meter directly and also gives the appearance of receiving a response directly from the meter. In other words, the master is not "aware" that, in reality, it is communicating with an entirely different device. As a result, a network node represents the following devices on the M-bus: • The network node directly connected to the bus (i.e., itself) • All the network nodes existing within the radio network • All the radioing meters existing within the radio network The number of devices that a network node represents on the M-bus can be determined on the basis of the information shown on the LCD display (sum of B and C levels). Since most radioing meters only possess transmitters but no receivers and since the travel time in the radio channel is much greater than the M-bus standard would permit, many commands that access the devices are only partly executed or are refused (e.g., "Change Cutoff Date"). For intra-company use only 11/56 Siemens Netzwerkknoten WTT16/WTX16 Building Technologies The Network Node 09.03.2007
Page 1 and 2: Siemeca AMR ® Network Node WTT16/
Page 3 and 4: Contents 1 General Remarks about th
Page 5 and 6: 1 General Remarks about the M-Bus M
Page 7 and 8: M-Bus Data Transmission Format Exam
Page 9: M-Bus Standard The OSI Reference Mo
Page 13 and 14: This time interval starts after the
Page 15 and 16: CI Field Check Sum Types of M-Bus T
Page 17 and 18: M-Bus Protocol In reply to a reques
Page 19 and 20: Manufacturer ID The manufacturer ID
Page 21 and 22: 3.3 Application Layer Master to Sla
Page 23 and 24: The following combinations are poss
Page 25 and 26: Extended Select / Deselect If the n
Page 27 and 28: The following application errors ma
Page 29 and 30: Status / Error Codes The status rep
Page 31 and 32: Example: 1. Error code 168 (A8h) in
Page 33 and 34: Example: 01 7C 06 54 54 41 42 20 25
Page 35 and 36: "Read Secondary Address" Command Ma
Page 37 and 38: c. If more than one CONFIRM or some
Page 39: h. Now, the master possesses a comp
Page 42 and 43: 4.1 Current Data (Memory Block #0)
Page 44 and 45: 4.2 Cutoff Date Data (Memory Block
Page 46 and 47: The example shows the statistical v
Page 48 and 49: 5.2 Types of M-Bus Telegrams Note:
Page 50 and 51: 5.3 Meter Readout from Network Node
Page 52 and 53: Keyword Index A A Field............
Page 54 and 55: T Telegram Format .................
Page 56: This documentation only provides ge

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Siemeca AMR â¢ Network Node WTT16/WTX16 M-Bus ... - Armatec AB