
4-47
SIMATIC 545/555/575 System Manual
Installing 575 System Hardware
Of the four serial communication ports on the 575 CPU, two are
modem-compatible RS-232 ports (one for a printer and one for an operator
interface), and one is an RS-422 operator interface port. The fourth RS-422
port is reserved for factory use.
Port 1 is a DTE RS-232 port with modem control lines. It is the primary
programming port. You can connect this port directly to most PC/AT serial
ports. Refer to Figure 4-27 for connection information. Use this port for
distances of up to 50 feet. You can set the baud rate of this port from 300 to
38,400 using TISOFT.
6
1
9
5
14
25
13
1
RTS
CTS
DTR
RD
TD
RTS
CTS
DTR
DSR
RD
Signal
Ground
DCD
9-Pin, Female
D Connector
Serial Port
(PC/AT)
25-Pin, Male
D Connector
Port 1
(PPX:575–2104)
4
3
2
8
7
2
3
4
5
7
8
20
GND
DCD
TD
Figure 4-27 Cable to Connect to 9-Pin PC Serial Port
Serial Port 1
Kommentare zu diesen Handbüchern