9.1.4 Frequency SetupFigure 9.1.4.1: WebConfig – Frequency Setuppreferred channelThis value defines the channel number that the reader will preferably use prior to otherchannels.channel maskThis mask defines the channels which may be used by the reader. Each activated checkbox enables the use of the corresponding channel (for more details see also chapter9.1.5 “Table of Frequencies“).28 896108_wi_en_li_udl-250_pro_v130214_io_sk_fh_bf.odt V14/05/09Wiring and Installation UDL 250