Technical data
74
Automation PC 3100 User's manual V 1.00
Translation of the original documentation
RS232 cables
Property
Signal line
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
4x 0.16 mm² (26 AWG), tinned copper stranded wire
PE
≤82 Ω/km
Wires stranded in pairs
Pair shielding with aluminum foil
Ground conductor
Cable cross section
Wire insulation
Conductor resistance
1x 0.34 mm² (22AWG/19), tinned copper stranded wire
PE
≤59 Ω/km
Outer jacket
Material
Properties
Cable shield
PUR compound
Halogen-free
Composed of tinned copper wires
Table 74: RS232 cable requirements
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
Transfer rate
1200 m
Typ. 115 kbit/s
Table 75: RS422 - Bus length and transfer rate
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
Property
Signal line
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
4x 0.25 mm² (24AWG/19), tinned copper stranded wire
PE
≤82 Ω/km
Wires stranded in pairs
Pair shielding with aluminum foil
Ground conductor
Cable cross section
Wire insulation
Conductor resistance
1x 0.34 mm² (22AWG/19), tinned copper stranded wire
PE
≤59 Ω/km
Outer jacket
Material
Properties
Cable shield
PUR compound
Halogen-free
Composed of tinned copper wires
Table 76: RS422 cable requirements
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.
RXD
RXD
TXD
TXD
9
6
4
1
DATA
DATA
Figure 10: RS232/422/485 interface - Operation in RS485 mode
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.
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