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KYL-500L_1 参数 Datasheet PDF下载

KYL-500L_1图片预览
型号: KYL-500L_1
PDF下载: 下载PDF文件 查看货源
内容描述: 无线POS终端专项射频模块 [Special RF module for Wireless POS Terminal]
分类和应用: 射频无线
文件页数/大小: 10 页 / 140 K
品牌: KYL [ SHENZHEN KYL COMMUNICATION EQUIPMENT CO,LTD. ]
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ShenzhenKYLCommunicationEquipmentCo.,Ltd  
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4800  
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19200  
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Timing diagram:  
c. Error dealing procedure:  
To enhance the reliability and stability of user’s systems, a verified bit or a  
Cyclic Redundancy Check (CRC) mode is highly recommended to resist wrong  
information while using KYL-500L modules.  
d. Large-number data transmission  
In theory, when the interface data rate is faster than the RF data rate, KYL-500L  
transceivers can sent unlimited-long data package, but any long packages more  
than 120B are not recommended. The length of each package should be between  
60~100B. We also recommend users to resist the wrong information by using  
Automatic Error Request Equipment (ARQ).  
Reasons:  
If the actual transmission BER (Bit Error Rate) is 10-4, 1 packet with 1KB data,  
which is about 10-thousand bits, is sent, theoretically, at least 1 bit will be  
received wrongly. So the 1KB information will never be received correctly.  
But if we package the data into 10 packets with 100B for each, when all 10  
packets are sent, there will be only 1 packet wrong according to this probability.  
After that, it will resend this wrong packet using ARQ mode. So resending one  
more packet and the efficiency rate is reduced 10%, all data will be absolutely  
received correctly.  
10. Antenna configuration:  
Many appropriative antennas for low power RF modules are selected to meet  
different users’ antenna configurations. Please ask our Sales for further  
information about the antenna’s dimension and performance.  
a. Helical SMA antennas  
KYL-ANT-433-10-SMA: 100mm helical SMA antennas with high gain and low  
cost, reach a long distance.  
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Fax: +86-755-83408785  
sales02@rf-data.com  
www.rf-data.com