5 Installation
5.3 Interfaces
MICRO PANEL XP-702
07/2011 MN04802003Z-EN
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37
5.3.4
RS232 (Com Port)
The RS232 interface is
not
electrically isolated. The GND pin is directly connected to the housing
potential.
Tab. 14 Pin assignment of the RS232 interface
Wiring
Shielded cables must be used.
The maximum baud rate depends on the cable length:
Tab. 15 Relationship of cable length / baud rate
CAUTION
Non-isolated interfaces
The device may be damaged due to potential differences.
The GND terminals of all bus stations must be connected.
Fig. 13 RS232 interface (9-pin, D-Sub, male, UNC)
Pin
Signal
Assignment
1
DCD
Data Carrier Detected
2
RxD
Receive Data
3
TxD
Transmit Data
4
DTR
Data Terminal Ready
5
GND
Ground
6
DSR
Data Set Ready
7
RTS
Request to Send
8
CTS
Clear to Send
9
RI
Ring Indicator
1 2 3 4 5
6 7 8 9
Cable length
Max. baud rate
2.5 m
115200 Bit/s
5 m
57600 Bit/s
10 m
38400 Bit/s
15 m
19200 Bit/s
30 m
9600 Bit/s
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