Detailed descriptions
16.1 Motherboard
SIMATIC Rack PC 840 V2
16-4
Operating Instructions, Edition 05/2006, A5E00248055-04
16.1.4
External interfaces
Interface
Position Connector Description
COM1
External X30
25-pin socket, V.24/V.28
COM2
External X31
9-pin, standard connector
LPT1
External -
25-pin, standard socket
PS/2 mouse External X22
6-pin, miniature DIN socket
PS/2
keyboard
External X23
6-pin, miniature DIN socket
USB 2.0
External X36
First and second USB channel, additional third internal USB
channel via USB cable to the front panel
PROFIBUS /
MPI
External X400
9-pin, standard socket, potentially isolated port
Ethernet
External X700
RJ45
VGA
External X303
15-pin socket
Serial port COM 1, X30
The serial port (COM 1) on the device has the following pinout:
Serial port COM 1 (socket)
Pin No.
Abbreviations
Meaning
Input /Output
1
–
Shield
–
2
TxD (D1)
Serial transmit data
Output
3
RxD (D2)
Serial receive data
Input
4
RTS (S2)
Request to send
Output
5
CTS (M2)
Clear to send
Input
6
DSR (M1)
Ready for operation
Input
7
GND (E2)
Functional ground (reference
potential)
–
8
DCD (M5)
Data carrier detect
Input
9
–
–
–
10–17
–
n.c.
–
18
–
–
–
19
–
–
–
20
DTR (S1)
Data terminal ready
Output
21
–
–
–
22
RI (M3)
Incoming call
Input
23–25
–
n.c.
–