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BIS V-6108 PROFINET
Processor Unit
35
english
Command designator 01
hex
: Read from data carrier
Reads USER data from the specified start address. The data length is equal to the number of
bytes.
When using a data carrier with expanded memory, the
Read Data Carrier
command can also be
executed as a command with 24-bit addresses.
Refer to: Command Identifier 81
hex
, Read Data Carrier with 24-bit Addresses.
Note
UHF data carriers, depending on the type, provide different memory banks. The read/
write head BIS VU can be configured with respect to the memory bank in order to
handle these memory banks.
The memory bank is preset at the factory to USER data. Please refer to the manual
for the UHF read/write head as well as the data sheet for the data carrier.
Subaddress
Meaning
Description of Function
00
hex
1st Bit Header
01
hex
Command Identifier 01
hex
: Read from data carrier.
02
hex
Start address
(low byte)
Start address for reading.
03
hex
Start address
(high byte)
Start address for reading.
04
hex
Number of bytes
(low byte)
Number of bytes to be read starting from the start
address.
05
hex
Number of bytes
(high byte)
Number of bytes to be read starting from the start
address.
…
None
No meaning
Last byte
2nd Bit Header
If the 1st and 2nd bit headers match, the data is valid.
If execution is successful, the response is passed to the input buffer in the following format:
Subaddress
Meaning
Description of Function
00
hex
1st Bit Header
01
hex
Data
Transmission of the data that is to be written to the data
carrier.
…
Data
Transmission of the data that is to be written to the data
carrier.
Last byte
2nd Bit Header
If the 1st and 2nd bit headers match, the data is valid.
Depending on the number of bytes to read and the configured buffer size, multiple bus cycles
may be necessary to transfer the data.
Structure of the
commands for
read/write heads
7
Device Functions