Balluff BIS U-6127-081-1 4-06-ST36 Betriebsanleitung Seite 284

BIS U-6127-081-1_4-06-ST36
Processor unit
8
007 protocol (continued)
Command identifier 'O': Read data carrier, EPC
Reads the EPC of a data carrier that is within the detection
range of the specified antenna.
If there are several data carriers in the detection range of
the specified antenna, the desired data carrier must be
selected before reading (see Command identifier 'z': Select
data carrier (Select) on page 105).
Byte Length Command
element
00 1 Command
identifier (ASCII)
01 1 Antenna number
(ASCII)
02 1 BCC
Status message
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
If the command is executed successfully, the requested
data will follow.
Byte Length Command
element
00 1 Status
01 1 Antenna number
(ASCII) (0 = all
active antennas)
02...03 2 Number of bytes
(ASCII)
04... No. of EPC data (LSB...
bytes MSB
Last 1 BCC
byte
LSB...MSB sequence means a reversed sequence compared to the
1)
arrangement in the memory of the data carrier.
108 english
Value range
'O'
'0': All active
antennas
'1'...'4': Single
antenna
00 ...FF
hex hex
Value range
<ACK> or
<NAK>
See table Status
codes on page
94
Value range
<STX>
Value range
<ACK>
'0'...'4'
"00"..."99"
Byte:
) 00 ...FF
1)
hex hex
00 ...FF
hex hex
If the data cannot be provided, a negative status message
follows.
Byte Length Command
element
00 1 Status
01 1 Status code
Value range
<NAK>
See table Status
codes on page
94