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NBEK-000-XXX

更新时间： 2024-11-09 03:21:39
品牌 Logo 应用领域
RADIOMETRIX 调制解调器控制器
页数 文件大小 规格书
7页 217K
描述
NBEK Controller As 1200 Baud Modem

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中文翻译

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NBEK-000-XXX 数据手册

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Radiometrix  
Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England  
Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233  
16 April 2008  
NBEK-000-xxx  
NBEK Controller As 1200 Baud Modem  
The Narrow band Evaluation Kit (NBEK) IC can be used as 1200baud half-duplex serial modem  
suitable for narrow band receivers, transmitters and transceivers (or any RF modules with >5kbps data  
rate). It takes care of preamble, synchronisation, bit  
balancing and error checking and enables a  
transparent radio data link to be established  
between radio devices  
This is a half duplex unit, so collisions between  
transmitted and received packets must be dealt  
with by the user.  
Provided no two devices attempt to transmit  
simultaneously no further restrictions on data  
Figure 1: NBEK-000-DIL  
transmission need be made, as all transmit timing,  
valid data identification and data stream buffering is conducted by the unit. Synchronisation and  
framing words in the packet prevent the receiver outputting garbage in the absence of wanted RF  
signal or presence of interference.  
Supports 1200 baud asynchronous data: 1 start bit, 8 data bits, 1 stop bit.  
With typical microcontrollers and UARTs, direct connection is usable as shown on figures 2 & 3.  
To connect to a true RS232 device, inverting level shifters must be used (MAX232 type are ideal, but  
simple NPN/PNP transistor switches often suffice as used in the application circuits figures 4 & 5).  
Features  
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Operating voltage (temperature): 5V for standard version (-40°C to +85°C)  
Maximum usage of the range capability of an RF module  
Adequate preamble to settle data slicer in the receiver  
Extra wake up preamble to allow for transmitter power up time requirements  
Differential Manchester encoding of address, data and checksum  
Synchronisation codes and checksum to reduce false triggering on noise  
Suitable to be used with Narrow Band FM radio modules  
Serial modem baud rate at 1200bps (half-duplex)  
Addressable point-to-point  
Applications  
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PDAs, organisers & laptops  
Handheld / portable terminals  
EPOS equipment, barcode scanners  
In-building environmental monitoring and control  
Remote data acquisition system, data logging  
Fleet management, vehicle data acquisition  
Radiometrix Ltd  
Page 1  
1200buad Modem IC  
1234567

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