The system may also include an infrared transmitter for transmitting {HEAD ~ infrared command signals} to a keypad controller having an internal infrared receiver or to {TAIL ~ an external infrared receiver} adjacent one of the drive units 
to
The system may also include an infrared transmitter for transmitting { HEAD ~ infrared command signals } to a keypad controller having an internal infrared receiver or to { TAIL ~ an external infrared receiver } adjacent one of the drive units
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH