Avlink YX-1044 - Manual (Page 13)

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Figure 6-5 (b)
) The Matrix RS-232 port is defined as DCE.
6.0.1 IR2 Connection
The YX matrix provides you an IR BOX for more convenient to react to the controller. Please
connect the IR BOX to the IR2 port that is on the rear panel.
Figure 6-6 IR Connection