Purpose
The CSAFE specification describes the physical wiring scheme as well as the format of the data frames. The CSAFE protocol is designed to work in a master/slave fashion. A special I/O jack on the exercise equipment accepts a normal 8P8C (RJ-45) plug (although the wiring scheme has no relation to ethernet) wired to a normal RS-232 cable. The CSAFE port also has pins which should be wired to an input audio jack.
Read more about this topic: Communications Specification For Fitness Equipment
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