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2014-
02
76
Commands
set password (PS)
Command:
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
1)
Telegram length, high byte
0
0
0
0
0
0
0
0
Byte 1
1)
Telegram length, low byte
0
0
0
0
1
0
1
0
Byte 2
Command code (42h)
0
1
0
0
0
0
1
0
Byte 3
Reserved/Channel/Toggle bit
0
0
0
0
<Channel>
<T>
Byte 4
Reserved
0
0
0
0
0
0
0
0
Byte 5
Reserved
0
0
0
0
0
0
0
0
Byte 6
Password 00h ... FFh
<PSW> (byte 3)
Byte 7
Password 00h ... FFh
<PSW> (byte 2)
Byte 8
Password 00h ... FFh
<PSW> (byte 1)
Byte 9
Password 00h ... FFh
<PSW> (byte 0)
1)
This byte is only used with the TCP/IP and MODBUS TCP/IP protocol.
Byte
Contents
Bit no.
7
6
5
4
3
2
1
0
Byte 0
1)
Telegram length, high byte
0
0
0
0
0
0
0
0
Byte 1
1)
Telegram length, low byte
0
0
0
0
0
1
0
1
Byte 2
Command code (42h)
0
1
0
0
0
0
1
0
Byte 3
Reserved/Channel/Toggle bit
0
0
0
0
<Channel>
<T>
Byte 4
Status
<Status>
1)
This byte is only used with the TCP/IP and MODBUS TCP/IP protocol.