Technical data • Individual components
Chapter 2
Technical data
Automation PC 910 User's Manual V 1.00
75
Serial interface COM
Serial interface (COM)
RS232
RS422/485
Type
RS232; not modem capable; electrically isolated
UART
16550-compatible, 16-byte FIFO
Transfer rate
Max. 115 kbit/s
Bus length
Max. 15 m
Max. 1200 m
Pin
RS232 pinout
RS422 pinout
1
n.c.
TXD\
2
RXD
n.c.
3
TXD
n.c.
4
n.c.
TXD
5
GND
GND
6
n.c.
RXD\
7
RTS
n.c.
8
CTS
n.c.
9
n.c.
RXD
9-pin DSUB plug
5
1
9
6
Table 62: Pinout - COM
Bus length and cable type RS232
The maximum transfer rate of 115 kbit/s depends on the cable type being used.
Extension
Transfer rate
≤ 15 m
Typ. 64 kbit/s
≤ 10 m
Typ. 115 kbit/s
≤ 5 m
Typ. 115 kbit/s
Table 63: RS232 - 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.
RS232 cable
Property
Signal lines
Cable cross section
Wire insulation
Conductor resistance
Stranding
Shield
4x 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
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: RS232 - Cable requirements
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 65: 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
Table 66: RS422 - Cable requirements
