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Technical data • Individual components
Chapter 2
Technical data
Automation PC 3100 user's manual V0.60
63
RS485 cables
Property
Signal lines
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
4x 0.25 mm² (24 AWG / 19), tinned copper stranded wire
PE
≤82 Ω/km
Wires stranded in pairs
Paired shield with aluminum foil
Ground line
Cable cross section
Wire insulation
Conductor cross section
1x 0.34 mm² (22 AWG / 19), tinned copper stranded wire
PE
≤59 Ω/km
Outer jacket
Material
Properties
Complete shielding
PUR compound
Halogen-free
Composed of tinned copper wires
Table 67: RS485 - Cable requirements
3.5.1.3.7 Terminating resistor
A terminating resistor for the serial interface is already integrated in the IF option. The terminating resistor is
switched on or off using a switch, but the system unit must be opened to reach it. A switched-on terminating resistor
is indicated by a yellow LED.
Switch for
terminating resistor
LED for terminating resistor
Figure 12: 5AC901.I485-00 - Terminating resistor