User's Manual

2
both antenna 1 and antenna 2 of which can be connected with
external antenna. XCRF-504W is four-ported reader, antenna 1,
antenna 2, antenna 3 and antenna 4 of which can be connected
with external antenna. In the case that the reader you ordered is
multi-ported, it is necessary to connect the unused antenna
ports to 50Ω /20W dummy load in order to protect the reader.