Version: 1.0, September 19, 2002
4 – APPLICATION INFORMATION
4.3 Speed
limitations.
The maximum speed a transponder can pass the reader antenna and the transponder can be read is depended on
the following factors:
Item
Typical value
•
Length of the detection trajectory.
6 meter
•
Distance between reader and tag.
5 meter
•
Number of valid frames needed for valid read.
3
•
Length of code.
64 bits
•
Data rate
1.875 KBPS
•
Frame time
34 msec
In this situation a maximum speed of 200 km/hour can be allowed. For every other geometry one should
carefully consider the above mentioned parameters before a specification on the maximum speed is defined.
This speed can ONLY be obtained with firmware in the 54 bit detection mode, see firmware user manuals.
4.4 Using more systems at the same location.
When two or more systems are within a range of 15 meters, these systems should have a frequency offset of at
least 600 kHz with respect to each other. The frequency should be factory set. When in doubt or when two
readers are ‘looking’ to each other, frequency offset is recommended. This frequency offset has to stay within the
local radio regulations.
When two readers are heaving a frequency offset they can be mounted close together and they can read the same
label at the same time.
© NEDAP IDEAS – AVI
P.O. Box 103, NL-7140 AC GROENLO
Page 31-41
