BIS V-6108 PROFINET
Processor Unit
60
english
Command Identifier 53
hex
: Bulk Read
The
Bulk Read
command reads the data from a data carrier population. Optionally from all of the
data carriers that are found in the active read/write zone of the antenna or from a subset that
was previously selected with the Select command.
The Bulk Read command first reports only the number of data carriers that were detected in the
active field of the antenna. The data in the data carriers is then read out and transmitted to the
controller.
If the data carriers are removed from the active field of the antenna in between the detection and
read out stages or if they cannot be successfully read out for other reasons, erroneous data may
occur. In which case, the data will be marked as invalid via a check byte at the end of the data
block and transmitted to the controller.
Data blocks marked as valid in their check bytes can be used without restrictions.
A maximum of 255 bytes from 255 data carriers can be read at a time.
Subaddress
Meaning
Description of Function
00
hex
1st Bit Header
01
hex
Command Identifier 53
hex
: Bulk Read.
02
hex
Start address
(Low Byte)
Start address for reading.
03
hex
Start address
(High Byte)
Start address for reading.
04
hex
No. of bytes
(Low Byte)
Number of bytes to be read starting from the start
address.
05
hex
No. of bytes
(High Byte)
Number of bytes to be read starting from the start
address.
06
hex
Data carrier
selection
All = 0 / Selected = 1
07
hex
Max. Tags
Maximum number of tags.
…
None
No meaning
Last byte
2nd Bit Header
If the 1st and 2nd bit headers match, the data is valid.
Specific
commands for
BIS VU read/write
heads
7
Device Functions
