Thingmagic M6e Manual de usuario descargar pdf (Pagina 43)

Serial Communication Protocol

A DIVISION OF TRIMBLE

Communication Protocol 43

Reader-to-Host Communication

The following diagram defines the format of the generic Response Packet sent from the

reader to the host. The Response Packet is different in format from the Request Packet.

CCITT CRC-16 Calculation

The same CRC calculation is performed on all serial communications between the host

and the reader. The CRC is calculated on the Data Length, Command, Status Word, and

Data bytes. The header is not included in the CRC.

Header Data Length Command Data CRC-16 Checksum

Hdr Len

Cmd

CRC HI CRC LO

1 byte 1 byte

1 byte

2 bytes

Status Word

0 to 248 bytes2 bytes

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 99 100

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Thingmagic M6e Manual de usuario Pagina 43