Simons Voss Technologies SmartRelay 3 Manual page 103

9. Installation
SmartRelay 3 system (Manual)
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Readers are able to communicate through materials such as wood, steel
and concrete when used with active transponders. The reader can be
mounted either on the inside or on the outer side.
NOTE
A transponder's read range may be reduced due to interference in the
surrounding area.
Strong magnetic fields can shorten the read range. Aluminium structures
may block communication between the transponder and reader.
You can enable the Close-up range mode option in the LSM software.
This option reduces the B field reader range, reduces the impact from
possible sources of interference and can prevent a transponder from
overmodulating.
9.2.1.2 Use of cards
The card-to-reader range (read range) extends up to 1.5 cm.
Direct contact must be established between the card and reader once the
reader is mounted.
9.2.2
9.3 SmartOutput module
The SmartOutput module is designed for fitting onto a DIN rail.