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BS EN 14908-2:2014

BS EN 14908-2:2014

$142.49

Open Data Communication in Building Automation, Controls and Building Management. Control Network Protocol – Twisted Pair Communication

Published By Publication Date Number of Pages
BSI 2014 24
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This European Standard specifies the control network protocol (CNP) free-topology twisted-pair channel for networked control systems in commercial Building Automation, Controls and Building Management and is used in conjunction with EN 14908-1:2014. The channel supports communication at 78,125 kbit/s between multiple nodes, each of which consists of a transceiver, a protocol processor, an application processor, a power supply, and application electronics.

This European Standard covers the complete physical layer (OSI Layer 1), including the interface to the Media Access Control (MAC) sub-layer and the interface to the medium. Parameters that are controlled by other layers but control the operation of the physical layer are also specified.

PDF Catalog

PDF Pages PDF Title
5 Foreword
6 Introduction
7 1 Scope
2 Normative references
3 Network overview
4 System specifications
4.1 General aspects
4.2 Cable
4.3 Topology
4.3.1 Free or bus topology
8 4.3.2 Repeater
4.4 Cable termination
4.4.1 Free-topology segment
4.4.2 Bus topology segment
Figure 1 — Termination
4.5 Segment configuration
9 Table 1 — Bus-topology distance specifications
Table 2 — Free topology distance specifications
4.6 Power specifications
5 Link power
5.1 General
5.2 Source
10 Figure 2 — Link Power Source
5.3 Power supply requirements
11 Table 3 — Power supply requirements
12 Figure 3 — Power supply output ripple voltage requirement
Figure 4 — Power supply start-up interval behaviour
5.4 Passive coupler circuit
13 Figure 5 — Coupler circuit schematic
Table 4 — Coupler circuit bill of materials
14 6 Node specifications
6.1 Link power
Table 5 — Link power requirements
6.2 Hot plugging
6.3 Transmitter/receiver interface to the MAC sub-layer
6.3.1 Physical layer protocol data unit
Figure 6 — Physical layer protocol data unit
6.3.2 Frame format
15 Figure 7 — Frame format for compliant transmitter
6.3.3 Transmit waveform
16 Figure 8 — Idealised transmit waveform – zero bit
Figure 9 — Idealised transmit waveform – one bit
17 Figure 10 — Maximum voltage spectrum over frequency relative to peak
6.4 Impedance
18 Figure 11 — Minimum impedance – powered and unpowered node
7 Communication parameters
19 Table 6 — Communication parameters for interoperable transceiver
20 Annex A (informative) Environmental specifications
Table A. —Representative environmental specifications for nodes
21 Bibliography

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BS EN 14908-2:2014
$142.49