RFID Communications
6.4 Standard ABx Protocol
The ABx standard is a binary protocol, word
Table 17: Single Tag Example
Field | Number | Content | |
of Bytes | |||
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Header | 1 | AAH | |
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Command | 1 | Command Code | |
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| |
Start Address | 2 | One word gives the first byte of tag memory to be accessed | |
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| |
Number of Bytes | 2 | One word gives the number of contiguous bytes to be accessed. Not used on 07H, | |
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| 08H, 14H, 16H | |
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| |
Block Addresses | 2 | The first byte gives the address of the first block. The second byte gives the | |
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| number of blocks to be interrogated. Only used with command 14H | |
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Timeout | 2 | 0001H to FFFEH milliseconds | |
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Data | varies | Data that is written to a tag. Each byte is included in the LSB of a | |
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Terminator | 2 | FFFFH | |
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Table 18: Multi-tag Example
Field | Number | Content | |
of Bytes | |||
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| ||
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| |
Header | 1 | AAH. Always the MSB of the first word of an ABX Standard command | |
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Command | 1 | Command Code - LSB of the first word | |
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Family code | 1 | 00H to address all tags in field | |
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Reserved | 1 | Reserved for future use, set to 00H | |
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Start Address | 2 | One word gives the first byte of tag memory to be accessed | |
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| |
Number of Bytes | 2 | One word gives the number of contiguous bytes to be accessed. Not used on | |
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| commands 87H, 88H, 91H, 8BH, 8CH | |
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| |
Block Addresses | 4 | The first word gives the address of the first block. The second word gives the | |
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| number of blocks to be interrogated. Only used with command 91H | |
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Timeout | 2 | 0001H to FFFEH milliseconds | |
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| |
Data | varies | Data that is written to a tag. Each byte is included in the LSB of a | |
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Terminator | 2 | FFFFH | |
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59 | LRP2000 Passive Reader/Writer |