Balluff BIS U-6127-081-1 4-06-ST36 Betriebsanleitung Seite 278

BIS U-6127-081-1_4-06-ST36
Processor unit
8
007 protocol (continued)
Command identifier ',': Detect data carriers,
extended
Detects the data carriers (max. 999) that are located in the
detection range of the specified antenna and returns the
data specified under Data type as well as additional
information. With the data carrier selection, either all or
only selected data carriers can be detected
(see Command identifier 'z': Select data carrier (Select) on
page 105).
Additional information:
Field Description
Protocol Defined in standard:
Control Word EPC
TM
(PC) Protocols Generation-2 UHF RFID
Extended Defined in standard:
Protocol EPC
TM
Control (XPC 1) Protocols Generation-2 UHF RFID
Extended Defined in standard:
Protocol EPC
TM
Control (XPC 2) Protocols Generation-2 UHF RFID
Receive Signal Received Signal Strength Indicator
Strength (RSSI) allows conclusions to be drawn
Indicator (RSSI) about the signal quality with which the
data carrier was received. It depends,
among other things, on the tag type
and the distance of the detected tag
from the antenna.
The signed value is in the range
−128...+127, higher values mean a
higher signal level.
In the 007 protocol, the value is trans-
mitted as 3 ASCII digits in the range
'000'...'255'.
To get to the actual value range, the
following calculation is necessary:
Values from '000'...'127':
Interpret unchanged as number
0...127.
Values from '128'...'255':
Convert to the range −128...−1 by
subtracting 256.
Time stamp Contains the time when the data
carrier was detected in the UTC
(Universal Time Coordinate) time zone
Format: hhmmssnnn
hh = hours, mm = minutes,
ss = seconds, nnn = milliseconds
The PC, XPC1 and XPC2 fields are for expert
applications only. Detailed information can be
found in the UHF RFID standard EPC
Frequency Identity Protocols Generation-2
UHF RFID.
102 english
Radio-Frequency Identity
Radio-Frequency Identity
Radio-Frequency Identity
Radio-
TM
Byte Length Command
element
00 1 Command
identifier (ASCII)
01 1 Antenna number
(ASCII) (0 = all
active antennas)
02 1 Data type: EPC
or TID (ASCII)
03...05 3 Max. number of
data carriers
(ASCII)
06 1 Data carrier
selection (ASCII)
07 1 BCC
The positive status message contains additional
information and is transmitted as follows.
Byte Length Command
element
00 1 Status
01 1 Antenna number
(ASCII)
02 1 Data type EPC or
TID (ASCII)
03...05 3 Number of data
carriers found
(ASCII)
06...07 2 Number of bytes
per data carrier
(ASCII)
08 1 BCC
If the data cannot be provided, a negative status message
follows.
Byte Length Command
element
00 1 Status
01 1 Status code
If the status message is positive, data is requested with
<STX>.
Byte Length Command
element
00 1 Control com-
mand
Value range
','
'0'...'4'
'E': EPC
'T': TID
'000'...'999'
'0': All
'1': Selected
00 ...FF
hex hex
Value range
<ACK>
'1'...'4'
'E': EPC
'T': TID
'000'...'999'
'64'
00 ...FF
hex hex
Value range
<NAK>
See table Status
codes on page
94
Value range
<STX>