Siemens 505-2571 - Manual (Page 16)

Installing the Module 2-3 SIMATIC 505-2571 Program Port Expander Manual
The baud rates for each port may be individually set via DIP switches. In
addition, for the RS–232 ports (1 and 2) you can enable or disable hardware
handshaking. The PPX:505-2571 is shipped with all DIP switches in the
OFF position. This corresponds to a baud rate of 9600 and hardware
handshaking DISABLED for ports 1 and 2.
NOTE: Unless the device you are attaching explicitly requires hardware
handshaking, you should leave hardware handshaking DISABLED.
See Table 2-1 and Figure 2-1 for the location and settings of the switches.
All other communications parameters are fixed: Data Bits = 7, Parity = Odd,
Stop Bits = 1.
NOTE: Switch position 3 is not used for ports 3 and 4, since RS–422 does not
support hardware handshaking. For ports 3 and 4, switch 3 is ignored and
should be left in the OFF position. For all ports, switch positions 4 through
8 are reserved for future use and should be left in the OFF position.
Table 2-1 Baud Rate Switch Settings
Baud Rate Switch 1
Position
Switch 2
Position
Hardware
Handshaking
Switch 3
Position
1200 On On Disabled Off
2400 On Off Enabled On
9600 Off Off
19200 Off On
On
Off
Not Used
(Set to Off)
Hardware
Handshaking
Baud Rate
Example:
Dipswitch #1, #2 and #3 are shown in the “OFF” position
for Port 1 indicating a baud rate of 9600 and hardware
handshaking disabled.
Figure 2-1 Location of Baud Rate Switches
Configuring the
Module