Technical data • Individual components
56
Automation PC 510 User's Manual V 1.01
RS422 - Bus length and cable type
The RTS line must be switched on to activate the sender.
The maximum transfer rate of 115 kbit/s depends on the cable type being used.
Extension
Transfer rate
1200 m
Typ. 115 kbit/s
Table 63: RS422 - Bus length and transfer rate
The material used for the cable should preferably have all or most of the following properties in order to reach an
optimal transfer rate.
RS422 cable
Property
Signal lines
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
4x 0.25 mm² (24AWG/19), tinned Cu wire
PE
≤82 Ω/km
Wires stranded in pairs
Paired shield with aluminum foil
Grounding line
Cable cross section
Wire insulation
Conductor resistance
1x 0.34 mm² (22AWG/19), tinned Cu wire
PE
≤59 Ω/km
Outer sheathing
Material
Features
Cable shielding
PUR mixture
Halogen free
From tinned cu wires
Table 64: RS422 - Cable requirements
RS485 - Bus length and cable type
The maximum transfer rate of 115 kbit/s depends on the cable type being used.
Extension
Transfer rate
1200 m
Typ. 115 kbit/s
Table 65: RS485 - Bus length and transfer rate
The material used for the cable should preferably have all or most of the following properties in order to reach an
optimal transfer rate.
RS485 cable
Property
Signal lines
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
4x 0.25 mm² (24AWG/19), tinned Cu wire
PE
≤82 Ω/km
Wires stranded in pairs
Paired shield with aluminum foil
Grounding line
Cable cross section
Wire insulation
Conductor cross section
1x 0.34 mm² (22AWG/19), tinned Cu wire
PE
≤59 Ω/km
Outer sheathing
Material
Features
Cable shielding
PUR mixture
Halogen free
From tinned cu wires
Table 66: RS485 - Cable requirements
When used as an RS485 interface
The pins of the RS422 default interface (1, 4, 6 and 9) should be used for operation. The pins should be connected
as shown.