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Note
"Multitag" and "Initial Q"
With EPC Class1 Gen2, you can use "InitQ" to specify the maximum number of
transponders that can be expected to be located in the measuring field at the same time so
that collisions can be prevented.
The following formula applies:
2
Initial Q value
It is important to note here that the length of a read cycle increases the higher the value of
Initial Q is. This value is calculated from the "Multitag" variable that is set by an "init_run"
command of the RF620R/RF630R readers. Note the following rule of thumb if you want to
optimize performance; the value should be as low as possible and as high as necessary.
The setting of "Multitag" can be found in the description of the "init_run" command for FB55
in the "RF620R/RF630R parameter assignment manual
(http://support.automation.siemens.com/WW/view/en/33287195)".
The parameter settings in the "RSSI", "Power Ramp" and "Special" tabs are adopted in the
"Parameter" tab and if they are saved, they are also saved on the reader.
The following table shows the tabs of the software user interfaces that are affected by
changes to the parameters in the "Parameter" tab:
Tab
Active UHF algorithm
Black
Power
List
Ramp
Info
-
-
Tag Data
X
-
RSSI
X
-
Power
X
X
Ramp
Tag list
X
X
VSWR
-
-
Firmware
-
-
update
Are shown in the status bar of the software user interface.
1)
Are not shown in the status bar of the software user interface.
2)
Only in conjunction with activating ITF(phase 2).
3)
SIMATIC RF-DIAG
Operating Manual, 09/2012, C79000-G8976-C292-01
= Number of expected transponders (corresponds to "Multitag").
Parameter settings in the "Parameter" tab have effects in the following tabs
1)
Power
Smoo-
ITF
ISTM
Gap
thing
-
-
-
-
-
-
-
-
-
-
-
-
X
X
X
-
-
-
-
-
-
5.4 The tabs of the RF620R/RF630R readers
Other non-displayed UHF algorithms
Power
Tag
Fast
Ramp
Hold
Read
2
3)
-
-
-
-
-
-
-
-
-
-
-
-
X
X
-
-
-
-
-
-
-
Operating the software
Read/
Radio
Reader
Write
Settings
Para-
Boost
meter
-
-
-
-
X
X
-
-
X
-
-
X
-
-
X
-
-
-
-
-
-
2)
Store
Parameter
on File
-
-
X
-
X
-
X
-
X
-
-
-
-
-
61

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