Siemens 505-2571

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 T

able 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.

able 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 Of

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