Total Buffer; Output Buffer - Balluff BIS U-6026-034-104-06-ST35 Betriebsanleitung

BIS U-6026-034-1_4-06-ST35
Processor unit
8
Device function
8.1 Function principle of the BIS U-6026
Two buffers are needed to exchange data and commands
between the processor unit and the host system. The
buffer contents are exchanged using cyclical polling. The
buffer content depends on the cycle in which it is written
(e.g. control commands at the beginning of a job).
When writing to the buffer, the transmitted data from the
preceding cycle is overwritten. Unwritten bytes are not
deleted and retain their data content.
8.1.1

Total buffer

The buffer size of the input and output buffers is 32 bytes
each.
This total buffer is divided into two halves of 16 bytes each
for both antenna pairs 1/3 and 2/4:
– The first 16 bytes contain (depending on the status of
the HD bit) the process data for Antenna 1 or 3
– The second 16 bytes contain (depending on the status
of the HD bit) the process data for Antenna 2 or 4.
14 bytes per antenna are available for data exchange,
since the first and last byte of the respective data buffer
are used for control and for status messages.
8.1.2

Output buffer

The control commands are carried over to the identification
system and those on the data carrier are carried over to
written data through the output buffer.
Bit No.
Subaddress
00 = 1st bit string
hex
01
hex
Start address (Low Byte) or data
02
hex
03
hex
04
hex
05
hex
06
hex
07
hex
...
Last byte
= 2nd bit string
22 english
7 6 5 4 3 2 1
TI KA HD GR
Command designator or data
or number of bytes
Start address (Middle Byte) or
data
Start address (High Byte) or
data
Number of bytes (Low Byte) or
data
Number of bytes (Middle Byte)
or data
Number of bytes (High Byte) or
data
Data
TI KA HD GR
Configuration and explanation (output buffer)
Sub- Bit
address name
00 = TI Toggle bit
hex
bit in
string
KA Antenna
deactiva-
tion
HD Antenna
selection
GR Basic
state
AV Assign-
ment
Command identifiers (output buffer)
Command
No command
Read data carrier (USER data)
0
Read EPC
AV
Read TID
Write data carrier (USER data)
Write EPC
Write constant value (USER data)
Set antenna power
Read out antenna power
Read multiple data carriers (EPC)
AV
Read number of tags
Select (select data carrier)
Unselect (remove selection)
Set IO outputs
Read IO inputs
This command ID is recommended for new systems since it is compatible
1)
with other BIS product families.
Meaning Functional description
Controller is ready to
receive additional data
(read job).
Activates or deactivates
the antenna selected with
HD.
0: activated
1: deactivated
Selection of the antennas
for buffer 1 and buffer 2.
Buffer 1 Buffer 2
0: antenna 1 0: antenna 2
1: antenna 3 1: antenna 4
The processor unit goes
into basic state for the
respective antenna. Any
pending job is canceled.
A job is pending for the
respective antenna.
Command
recognition
00
81
01
42
03
44
05
82
02
43
04
B2
32
45
46
47
55
40
41
61
62
1)
hex
1)
hex
hex
1)
hex
hex
1)
hex
hex
1)
hex
hex
1)
hex
hex
1)
hex
hex
1)
hex
1)
hex
1)
hex
1)
hex
1)
hex
1)
hex
1)
hex
1)
hex