Sony KDP-51WS550 Operating Instructions Manual page 41

Using the CONTROL S Feature
CONTROL S allows you to con_:ol your system and other Sony
equipment with one remote control, In addition to allowing you to
control multiple devices with one romote con_:ol, the CONTROL S
feature allows you to always point you*: remote control at your TK
instead of having to point it at the other equipment, which might be
hidden or out of direct line of sight,
Use CONTROL S IN to send signals to the _Z
Use CONTROL S OUT to s_md signals to connected equipm_mt.
VHF/UHF CABLE
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