Physical Overview
39
RS-485 - Bus length and cable type
The maximum transfer rate of 115 kBit/s depends on the cable type being used.
The material used for the cable should preferably have all or most of the following properties
in order to reach an optimal transfer rate.
Distance [m]
Transfer rate [kBit/s]
1200
Typ. 115
RS-485 cable
Property
Signal lines
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
4 x 0.25 mm² (24AWG/19), tinned Cu wire
PE
82
/km
Wires stranded in pairs
Paired shield with aluminum foil
Grounding line
Cable cross section
Wire insulation
Conductor resistance
1 x 0.34 mm² (22AWG/19), tinned Cu wire
PE
59
/km
Outer sheathing
Material
Characteristics
Entire shielding
PUR mixture
Halogen free
From tinned cu wires
Содержание PS-4000B Series
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