HRT-227CS, HART to Single Mode Fiber Converter (version 1.00)
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2015/02/02
Page: 16
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3. Cable Selection
3.1. HART Cable Selection
The HART bus is a balanced (differential) 2-wire interface running over a Shielded
Twisted Pair (STP), Un-shielded Twisted Pair (UTP), or Ribbon cable. In general, the
minimum conductor size is 0.51mm diameter (#24 AWG) for cable runs less than 1,500
meters (@ 5,000 ft.) and 0.81mm diameter (#20 AWG) for longer distances. However,
the electrical characteristics of the cable
–
primarily its capacitance
–
and the number of
connected devices can affect the maximum allowable cable length. The table below
shows the effect of cable capacitance and the number of network devices on cable
length.
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