Balluff BIS U-4A7-082-01C-07-S4 Betriebsanleitung Seite 118

BIS U-4A7-082- _1C-07-S4
Industrial RFID system - Read/write head
8
System integration (continued)
Activate BlockWrite
Parameter-ID: 0x0084 – Subindex 12
UHF-Manager: Menu: Device Settings > Advanced
parameters... > Air interface
With normal write accesses to a data carrier, the data is
written sequentially to the data carrier word by word via
several write operations. Activate BlockWrite allows several
data words (16 bits) to be written to the data carrier with a
single write access. The maximum number of data words
can be defined via the Max. write length parameter.
When using BlockWrite, care should be taken to ensure
that this command is supported by the data carriers used
and that the maximum write length (see subindex 13 on
page 34) does not exceed the capabilities of the media.
If the BlockWrite command cannot be executed
successfully on a data carrier because, for example, the
data carrier does not support the command, the write
operation is repeated with the ordinary write command.
In time-critical applications, BlockWrite can offer
a time advantage. However, care must be taken
to ensure that all data carriers support this
command.
Mixed operation of data carriers with and
without BlockWrite support can lead to higher
write/read times.
Adjustable values:
Length Permissible
[bits] values
8 0 or 1
34 english
Factory Meaning
setting
0 (Block- 0 BlockWrite off
Write off) 1: BlockWrite on
Max. write length
Parameter-ID: 0x0084 – Subindex 13
UHF-Manager: Menu: Device Settings > Advanced
parameters... > Air interface
The Max. write length defines the maximum number of
data words (16 bits) that can be transferred with a
BlockWrite command.
1 to 255 data words can be transferred, whereby the
setting of 1 corresponds to an ordinary write command.
Adjustable values:
Length Permissible Factory
[bits] values setting
8 1...255 16
(16 words)
(32 bytes))
In a heavily electromagnetically stressed
environment, better results may be achieved if
fewer data words are transmitted in a
command.
For the set write length to be used, the
following conditions must apply:
– The BlockWrite command must be enabled
(see subindex 12 on page 34).
– The data carrier must support the
BlockWrite command.
– The data carrier must support the number
of data words set here for the BlockWrite
command.
Meaning
Number of data
words when
writing with
BlockWrite