B&R Automation PC 3100 User Manual page 74

Technical data
RS232 cables
Signal line
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
Ground conductor
Cable cross section
Wire insulation
Conductor resistance
Outer jacket
Material
Properties
Cable shield
2.3.5.2.3.4 RS422 - Bus length and cable type
The RTS line must be switched on to activate the transmitter.
The maximum transfer rate of 115 kbit/s depends on the cable length and type of cable used.
Extension
1200 m
Preferably, the cable material used should have the following properties or deviate only slightly from them in order
to achieve an optimal transfer rate.
RS422 cables
Signal line
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
Ground conductor
Cable cross section
Wire insulation
Conductor resistance
Outer jacket
Material
Properties
Cable shield
2.3.5.2.3.5 Operation as an RS485 interface
The pins of the RS422 default interface (1, 4, 6 and 9) must be used for operation. To do this, connect the pins
as shown.
The RTS line must be switched by the driver for each transmission or reception; there is no automatic switch-back
mechanism. This cannot be configured in Windows.
74
Table 74: RS232 cable requirements
Table 75: RS422 - Bus length and transfer rate
Table 76: RS422 cable requirements
9
RXD
4
TXD
6
RXD
1
TXD
Figure 10: RS232/422/485 interface - Operation in RS485 mode
Automation PC 3100 User's manual V 1.00 Translation of the original documentation
Property
4x 0.16 mm² (26 AWG), tinned copper stranded wire
PE
≤82 Ω/km
Wires stranded in pairs
Pair shielding with aluminum foil
1x 0.34 mm² (22AWG/19), tinned copper stranded wire
PE
≤59 Ω/km
PUR compound
Halogen-free
Composed of tinned copper wires
Transfer rate
Typ. 115 kbit/s
Property
4x 0.25 mm² (24AWG/19), tinned copper stranded wire
PE
≤82 Ω/km
Wires stranded in pairs
Pair shielding with aluminum foil
1x 0.34 mm² (22AWG/19), tinned copper stranded wire
PE
≤59 Ω/km
PUR compound
Halogen-free
Composed of tinned copper wires
DATA
DATA