User manual

SCM3712 REFERENCE MANUAL 82
9.3.5. Recommended distance between readers
Contactless readers are being influenced in performance by their environment. Other contactless
devices working in the same or a similar frequency range also can have an influence on the overall
performance. The below drawing illustrates the minimum recommended distance between two
readers without influencing each other. A closer distance than the recommended distance may result
in a reduced read range or a negatively influenced interoperability. It makes no real difference which
SCM3712 reader boards are in proximity to each other.
The below dimensions are good as a guideline and valid for reading from and writing to any kind of
card or token.
Of course for NFC Peer-To-Peer (P2P) functionality readers may be put in close proximity. In this
case the used RF-protocol helps to minimize the influence as the command flow is being
synchronized in that case unlike the normal ISO14443 read/write mode.
SCM
3712
60,0
40,3
>300
External Antenna
92,7
49,5
SCM
3712 ANT
SCM
3712
60,0
40,3
>300
All dimensions are in mm
10mm
≈ 0,39 Inch
Fig.9-8: SCM3712 EA Mount in Metal Environment Instruction