User's Manual

4 – 3
EMC Directives
D101583 0207 BL ident
4
The measures for prevention of the interference (EMC) are relevant
for all three components. The manufacturer is obliged to undertake
all possible measures to counter the development of sources of
interference.
The installation design must be implemented to ensure that mutual
interference of the individual components is avoided or kept to as
low a level as possible.
How can RFID be subject to interference?
 Problem: interference radiation from the power supply when
switching mode power supplies are used.
Remedy: use of a stabilized power supply
 Problem: interference via the serial connection cable.
Remedy: improved cable shielding and/or read-write head
earthing
 HF interference via the antenna from another read-write head or
via an external source of interference which operates using the
same frequency.
Remedy: the interference from another read-write head can be
avoided by using the selective mode (see manual
BL ident Proxy-Ident-Block (PIB), D101578).
Coupled interference
There are four possibilities for coupled interference:
 Galvanic coupled interference
 Capacitive coupled interference
 Inductive coupled interference
 Radiated interference
There are different causes for the radiated interference on the data
interface paths:
With cables and wiring:
 Incorrect or poorly laid
 Missing or incorrectly connected shield
 Unfavourable arrangement of the cable