Deister Electronic GmbH MODEL260 用户手册

The reader may encounter a wide range of interference as shown in 
Figure 3, “GE Model 260 Reader Environmental Considerations,” on 
page 5. Common causes include:

Power wiring carries electrical noise that can interfere with the operation 
of the reader.  This is more common with traditional 125 KHz proximity 
readers. However, this is a potential issue with the GE Model 260 reader, 
particularly if data noise is introduced by coupling from the reader’s 
power wiring. Any power wire may inductively or capacitively couple 
noise into the reader data line.

Data network wiring can generate noise, which may possibly be in the 
operating frequency range of the reader.  This noise can interfere with 
reader-to-credential communication and reduce read range.

While not normally a source of noise itself (although it can cause 
problems if bundled in a loop directly behind the reader), security wiring 
can inductively or capacitively couple to data or power wiring, and 
transfer noise to the reader.

Signs and other metal objects within the read field of the reader can 
absorb or block reader-to-credential communication and reduce range.

Use shielded cable for reader communication. Reader installation 
considerations should avoid read field blocking and overlapping 
conditions.