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EM4223V2WS11 参数 Datasheet PDF下载

EM4223V2WS11图片预览
型号: EM4223V2WS11
PDF下载: 下载PDF文件 查看货源
内容描述: 只读超高频射频识别设备 [Read-only UHF Radio Frequency Identification Device]
分类和应用: 射频
文件页数/大小: 29 页 / 426 K
品牌: EMMICRO [ EM MICROELECTRONIC - MARIN SA ]
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R
EM4223  
BEGIN_ROUND COMMAND SELECTION OPERATION  
(see Fig. 19)  
The BEGIN_ROUND command contains 2 selection  
parameters. The 1st parameter, called MASK_LENGTH,  
consists of a fixed length (8 bit) value, which specifies  
how many bits will be sent in the following parameter,  
called the MASK. This MASK_LENGTH will be between  
0 and 136 for the EM4223. The MASK value will be  
compared to the number of bits of the tags data memory  
The MASK value is transmitted MSB 1st. The 1st bit of the  
MASK is compared to the MSB of the Transponders AFI,  
the 2nd bit of the MASK is compared to the 2nd most  
significant bit of the Transponders AFI and so on, up to  
the 8th bit of the MASK, which is compared to the AFI. If  
the 1st 8 bits of the MASK contain the value B00000000,  
the result of the comparison of the 1st 8 bits of the MASK  
specified in  
the MASK LENGTH parameter.  
to the AFI is forced to a Match result. If the  
Transponders with data matching the MASK in the  
command will move from the ROUND_ACTIVE or  
ROUND_STANDBY or READY states to the  
ROUND_ACTIVE state and commence participation in  
the Arbitration process. Transponders whose data does  
not match the MASK value sent in the command will  
remain in the READY state or they will move to the  
READY state if they are already in the ROUND_ACTIVE  
or ROUND_STANDBY states.  
MASK_LENGTH is less than 8 bits, then the number of  
bits of the Transponder’s AFI compared to the MASK is  
determined by the MASK_LENGTH parameter.  
The 9th to the 136th bits of the MASK is compared to the  
128 bit USER DATA in the Transponder – in other words,  
bit 9 of the MASK is compared to the MSB of the USER  
DATA and so on down to bit 136 of the MASK being  
compared to the LSB of the USER DATA. The number of  
bits of the USER DATA compared to the MASK is equal  
to MASK_LENGTH – 8 if MASK_LENGTH > 8. If  
MASK_LENGTH 8 no USER DATA bits will be  
compared to the MASK.  
Tags in the QUIET state will ignore the BEGIN_ROUND  
command.  
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