參數(shù)資料
型號(hào)： OL2381AHN
廠商： NXP Semiconductors N.V.
元件分類(lèi)： 微波射頻器件
英文描述： Highly Integrated Single Chip Sub 1-GHz RF Transceiver
封裝： OL2381AHN<SOT617-3 (HVQFN32)|<<http://www.nxp.com/packages/SOT617-3.html<1<Always Pb-free,;
文件頁(yè)數(shù)： 6/43頁(yè)
文件大?。?/td> 2978K
代理商： OL2381AHN
AN11017
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Application note
Rev. 2 — 10 May 2011
6 of 43
NXP Semiconductors
AN11017
Transceiver OL2381 using wireless M-BUS
2. Wireless M-BUS
To help protect against climate change, the EU passed a directive in 2006 which commits
its members to reduce their energy consumption. The directive was intended to raise
awareness of climate change due to energy consumption by promoting reduction in heat,
gas, electricity, water and so on. Smart meters can make this information readily
accessible and are key to realizing this goal.
Since 2010, it is compulsory to equip new buildings with smart metering devices that are
able to resend their data.
The 868 MHz SRD band was chosen because it has good data transmission range
characteristics. In this European license-free band, all users must follow regulating rules
intended to prevent overloading. These rules limit output power, duty cycle, and spectral
emissions. This regulation enables many transmitters to work in parallel within a finite
area.
The physical and data link layer for wireless M-BUS is specified in the European Standard
(
Ref. 5
). Different modes are specified for various applications in this standard. The
modes are described in the following chapters (as of February 2011, the C-, F- and
N-modes have not yet been released).
2.1 Wireless M-Bus mode S1
Table 1.
Title
Application
Sending rate
[1]
All values provided are typical values unless otherwise stated.
The metering devices only send their data to the data collector several times per day.
Consequently, the data collector is in the sleep mode for most of the day and only needs
to be awakened to receive the metering data. Alternatively, it periodically searches for a
valid transmission that typically starts with a long header. Read-out on request is not
possible in this mode.
Fig 2.
Mode S1
Mode S1
Description
[1]
transmit only meter for stationary receiving readout
six times a day - the battery receiver needs only to be active during
these time slots, or it is periodically searching for the long header.
868.30 MHz
±50 kHz
Manchester
32.768 kchip/s (data rate = 16,384 bps)
long header (576 chips)
Center Frequency
FSK Deviation
Data Encoding
Chip Rate
Frame
019aab754
Collector
Stationary Receiver
Battery or Mains powered
Meter
Mode S1
S
link
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