Precor UBK 815 - Manual (Page 27)

Installing the Console
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4.
Route the twisted, red-and-black heart rate sensor cable
and the flat, gray base unit data cable to the left of the
mounting bracket and about three-quarters of the way up
the left side of the console, as shown in the following
illustration.
Figure 11: Routing the data and heart rate cables
5.
Attach the base unit data cable to the eight-conductor
modular jack labeled LOWER BOARD CONNECTION.
6.
Attach the heart rate sensor cable to the four-pin
connector labeled HEART RATE.
Note: The cables on the connector and the circuit board
can fit together in only one way. There may also be a
10-pin connector labeled HEART RATE, but it is not
compatible with the equipment.