Siemens SIMATIC CP 440 Manual page 73

Transmission Rate/Character Frame
The table below describes the parameters for the transmission rate and character
frame.
Table 5-6 Transmission Rate/Character Frame (ASCII Driver)
Parameter
Transmission Rate Speed of data transmission in bps
Start Bit During transmission, a start bit is prefixed to
each character to be sent.
Data Bits Number of bits to which a character is mapped.
Stop Bits During transmission, a stop bit is appended to
every character to be sent to indicate the end of
the character.
Parity A sequence of information bits can be extended
to include another bit, the parity bit. The
addition of its value (0 or 1) brings the value of
all the bits up to a defined status. Thus the data
integrity is enhanced.
If "none" is specified for parity, no parity bit is
sent.
It is not possible to specify "none" if 7 data
bits are set.
Point-to-point connection CP 440 Installation and Parameter Assignment
A5E00057742-02
Configuring and Parameterizing the CP 440
Description Value Range Default Value
300 9600
600
1200
2400
4800
9600
19200
38400
57600
76800
115200
1 (fixed 1
value)
7 8
8
1 1
2
None Even
Odd
Even
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