Commands
2014-
02
75
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.
Setting "Default Read"
1. Activate the password mode.
2. Write the read range start and end into the "Control Word".
3. Deactivate the password mode.
4. Read the data range with address designation 0000h and word count 0h.
Note!
The addresses for the start and end of the read range are based on the absolute word address
of the read/write tag, not on <WordAddr>.
Example: With the setting read range start 03h and read range end 03h, the R/W head only
reads the first data word in the read/write tag.
