BR-Automation Automation PC 820, User Manual, Page: 49 / 252

Technical data • Entire device
Chap
ter 2
Te
chn
ica
l da
ta
49 Automation PC 820 User's Manual V 1.00
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 - 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.
The material used for the cable should preferably have all or most of the following properties in
order to reach an optimal transfer rate.
RS232 cable Property
Signal lines
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield 4 x 0.16 mm² (26AWG), 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 1 x 0.34 mm² (22AWG/19), tinned Cu wire
PE
≤
59
Ω
/km
Outer sheathing
Material
Characteristics
Entire shielding PUR mixture
Halogen free
From tinned cu wires
Table 25: RS232 - Cable requirements
Extension Transfer rate
1200 m typ. 115 kBit/s
Table 26: RS422 - Bus length and transfer rate
RS422 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
Ω
/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
Ω
/km
Outer sheathing
Material
Characteristics
Entire shielding PUR mixture
Halogen free
From tinned cu wires
Table 27: RS422 - Cable requirements