Comtrol UP DeviceMaster Filtering and Data Extraction Manual do Utilizador descarregar pdf (Página 11)

Chapter 3. RFID Data Extraction and PLC/Application InterfaceDeviceMaster UP Filtering and Data Extraction Reference Guide: 2000470 Rev. B - 11

Chapter 3. RFID Data Extraction and PLC/

Application Interface

The RFID data extraction process extracts the various parameters from EPCglobal formatted tags. It is

designed to greatly simplify PLC and application programming tasks.

EPCglobal is the world wide standard for RFID tag formats. It encompasses a number of 64 and 96 bit

encoding schemes and, at present, a total of 43 specified formats, of which 35 are unique.

When RFID filtering is enabled and a valid filtering criteria is specified, all received data is sent to the PLC

and/or application in a consistent format. If a tag with a valid EPCglobal format is received, the various

parameters will be extracted and placed into a formatted data message. The associated tag ASCII string will

be placed in the message data area. (The ASCII tag format may vary depending on the RFID reader.) Any

non-tag messages will be placed in the data area and the tag parameters will be set to zero.

3.1. RFID Data Formats

The RFID data formats have the following characteristics:

• For the PLC, contains the same Produced Sequence Number and Length fields as a regular receive data

message.

• Contains the RFID specific parameters and the RFID tag ASCII string (or unknown message data).

• Has a similar format for both the PLC and application interface.

3.1.1. PLC RFID Data Format

When the PLC interface is operating in RFID filtering mode, all data sent to the PLC uses this format.

Fields Data Type Description

Produced data

sequence number

UINT

Values = 0-65535 (FFFF Hex)

Sequence number that is incremented with each new

message.

Length of RFID

message

UINT

Values = 20-148

Length in bytes of following data.

Company Code UDINT[2]

Company Code extracted from tag data. Depending on

encoding scheme, this field may include Company

Prefixes, Company Prefix Indexes, or Government

Managed Identifier.

Product/Location

Code

UDINT[2]

Product Code extracted from tag data. Depending on

encoding scheme, this field may include the Item

reference, location reference, asset reference, object class,

or be set to zero.

Serial Number UDINT[2]

Serial Number extracted from tag data. Depending on

the encoding scheme, this field may include the Serial

Number or individual asset reference.

Encoding Scheme UINT Encoding scheme from tag data.

Filtering Value UINT Filtering value from tag data.

Antenna Number UINT Antenna number on RFID reader/scanner.

Tag Data Length UINT Length of RFID tag string in bytes.

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 25 26

Comentários a estes Manuais

Sem comentários

Comtrol UP DeviceMaster Filtering and Data Extraction Manual do Utilizador Página 11

Comentários a estes Manuais

Manuais e produtos relacionados com Acessórios de comunicações Comtrol UP DeviceMaster Filtering and Data Extraction