Rockwell-automation 56RF RFID System User Manual User Manual download pdf (Page 63)

Rockwell Automation Publication 56RF-UM001A-EN-P - October 2011 63

RSLogix 5000 Controller Tags Chapter 7

•Address – The channel Address word is a 2-byte value that will contain

the address or block value within the RFID tag that the command will

execute on.

•BlockSize – The channel BlockSize word is a 2-byte value that will store

the expected Block Size for the tag. Valid values are 0, 4, or 8 bytes per

block. A value of 0 will default to a Block Size of 4 bytes per block.

•Command – The channel Command word is a 2-byte value that will store

the next command for the interface to process. The RFID interface will

execute the command once when this value changes. If a command must be

repeated then set the value to zero first and then change it again to the

desired command. Use a MOV or COP instruction to store the command

value in this tag.

•Data – Depending on the Data Format, the channel Data word is either an

array of 2-byte values or an array of 1-byte values that total 112 bytes in

length per channel. This array is used to store information that will be

directed to the RFID interface. Some commands, such as reading, do not

require the use of this data field. Writing to tags will utilize this

information in conjunction with the length field to inform the RFID

interface what values it needs to write. The size of this word allows the

writing of up to 28 blocks of data to a tag at a time, with each block being

4-bytes in length.

•Length – The channel length word is a 2-byte value that will indicate the

data length for specific commands. Upon completion of a command, this

word will be populated with the number of 16-bit words returned to the

data field; at power up this value must be 0.

Value Command Description

1 Read Single Block Reads a single block of user data.

2 Read Multiple Blocks Reads multiple blocks of user data from a tag.

3 Multi-tag Block Read Reads information from up to four tags.

4 Read Byte Reads bytes of user data from a tag.

5 Start Continuous Read Initiates continuous read mode

6 Stop Continuous Read Stops continuous read mode

8 Teach Continuous Read Provides the ability to automatically set the best time to start

reading in continuous read mode.

10 Write SingleBlock Writes a single block of user data.

11 Write Multiple Blocks Writes multiple blocks of user data to a FRAM tag

12 Multi-tag Block Write Writes multiple blocks of user data to up to four tags.

13 Clear Multiple Bytes Clears multiple bytes of user data in a tag.

14 Write Byte Writes bytes of data to a tag.

20 Inventory Counts the number of blocks in the field (up to four) and

returns the UUID of the first tag in the field.

31 Read Transceiver Settings Read Baud Rate, Device ID and Retry Time.

33 Get Version Information Retrieves the firmware version from the transceiver.

34 Get System Information Gets Info Flags,UUID, DSFID, AFI,Memory Size and IC Reference

from Tag

41 Write AFI Write the AFI byte to the tag

42 Lock AFI Locks the AFI byte from future changes.

43 Write DSFID Writes the DSFID byte to the tag.

44 Lock DSFID Locks the DSFID byte from future changes.

45 Get Multiple Block Security Status Retrieves that security status of multiple blocks within a tag.

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