Commands
20
13
-0
4
49
Set password (PS):
Response:
The command
PS
sets the password, which the R/W head communicates to the
data carrier in password mode.
Operating mode
“
Default Read
”
In "default read" operating mode, 1 or 2 words are read extremely quickly. The
area of memory earmarked for reading is already specified on the tag. The R/W
head does not have to identify the memory area for the tag.
The start and end of the read range are stored in the bytes 0 and 1 of the control
word. As soon as power is supplied to the tag, it sends data from the data range
defined by the start and end of the read range. The data range between read
range start and end is read with the read commands
SR
(Single read words) and
ER
(enhanced buffered read words) when <WordAddr> is set to 0000h and
<WordNum> to 00h.
The advantage of "default read" operating mode is the readout speed. The
readout of one data word (4 bytes) is twice as fast in this mode as the other
modes. The readout of two words takes approx. 1/3 less time. No more time
advantages can be gained after three data words because "default read" mode is
designed to read a maximum of two words (= 8 bytes). Reading larger data
ranges can lead to error messages if the reading head does not respond within
the planned reaction time.
Byte
Contents
Bit no.
7
6
5
4
3
2
1
0
Byte 0
Command code (42h)
0
1
0
0
0
0
1
0
Byte 1
Reserved/Ident channel/Toggle bit
0
0
0
0
<Channel>
<T>
Byte 2
Reserved
0
0
0
0
0
0
0
0
Byte 3
Reserved
0
0
0
0
0
0
0
0
Byte 4
Password 00h ... FFh
<PSW> (byte 3)
Byte 5
Password 00h ... FFh
<PSW> (byte 2)
Byte 6
Password 00h ... FFh
<PSW> (byte 1)
Byte 7
Password 00h ... FFh
<PSW> (byte 0)
Byte
Contents
Bit no.
7
6
5
4
3
2
1
0
Byte 0
Command code (42h)
0
1
0
0
0
0
1
0
Byte 1
Reserved/Ident channel/Toggle bit
0
0
0
0
<Channel>
<T>
Byte 2
Status
<Status>
