Device Function; Total Buffer; Output Buffer - Balluff BIS U-6028-048-104-06-ST28 Betriebsanleitung

BIS U-6028-048-1_4-06-ST28
Processor unit
8

Device function

8.1 Function principle of the BIS U-6028
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 total buffer corresponds to the
plugged-in RT module. This total buffer is distributed to the
two antennas using the parameter "Buffer 1". To exercise
reading or writing of the USER data, a buffer size of at
least 9 bytes is required.
Example:
If a total buffer of 16 bytes is selected and the parameter
"Buffer 1" (antenna 1/3) is set to 10 bytes, 6 bytes remain
for antenna 2/4.
Two bytes less 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.
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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.
7
Subaddress
00 = 1st bit string
hex
01 Command designator or data
hex
Start address (Low Byte) or data
02
hex
Start address (Middle Byte) or
03
hex
Start address (High Byte) or
04
hex
Number of bytes (Low Byte) or
05
hex
Number of bytes (Middle Byte)
06
hex
Number of bytes (High Byte) or
07
hex
...
Last byte
= 2nd bit string
Configuration and explanation (output buffer)
Sub- Bit Meaning
address name
00 = TI Toggle bit
hex
bit in
string
KA Antenna
deactivation
HD Antenna
selection
GR Basic state The processor unit goes
AV Assignment A job is pending for the
6 5 4 3 2 1 0
TI KA HD GR AV
or number of bytes
data
data
data
or data
data
Data
TI KA HD GR AV
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
into basic state for the
respective antenna. Any
pending job is canceled.
respective antenna.
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