User's Manual

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10. IR Detection Operating Principles
IR signal is line of sight and cannot penetrate through wall. Thus, it
is accurate in room base level tracking. IR signal tend to bounce
from blocking material (IR reflector) such as concrete wall, table and
etc. These IR reflectors will act as secondary IR source and help to
scatter the IR signal to any direction in a room. As a result, an IR
receiver, from any direction, in a room will be easily to pick up IR
signal. Below examples illustrate the placement SMN-890 in each
scenario to achieve best IR reception result.
1. The SMN-890 should be placed at centre of a room so that it
can achieve larger IR coverage area.
2. Try not to place SMN-890 facing the door way in order to
reduce IR spill out from a room.
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