Honeywell SYA14 Series Manual page 38

3.7.3 Vertical Mounting / Linear Assembly
MUTUAL INTERFERENCE OR CROSSTALK
When two emitter/receiver units are mounted together to obtain a greater protected
height, the emitter and receiver units must be mounted in a reverse transmitting position
to prevent mutual interference or cross-talk. Reception of two infrared emissions will
maintain the light curtain in a lock-out condition. To go back to normal operation, switch
off and on the light curtain power.
Two emitter/receiver units may be mounted together to obtain a greater protected height
(see figure below). The units may be mounted with the overlapping housings to maintain
the resolution throughout the protected height.
Figure 3-12 Linear Assembly
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107031-23 EN FR26 GLO 1199 Printed in France