Basic Principles of Serial Data Transmission
2.8 Configuration data
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01 89
Baud rate/Character frame
The table below contains descriptions of and specifies ranges of values for the relevant
parameters.
Table 2- 12 Baud rate/Character frame (ASCII driver)
Parameters Description Range of values Default value
Baud rate Data transmission rate in bps (baud)
Notes:
A maximum of 19200 baud is possible for the 20mA-TTY interface.
• 300
• 600
• 1200
• 2400
• 4800
• 9600
• 19200
• 38400
• 57600
• 76800
• 115200
9600
Start bit During transmission, a start bit is prefixed to each character to be
sent.
1 (fixed value)
Data bits Number of bits to which a character is mapped.
• 7
• 8
8
Stop bits During transmission, the stop bits are appended to every character
to be sent; this signals the end of a character.
• 1
• 2
1
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 state. This improves data
integrity.
"No" parity means that no parity bit is sent.
• None
• Odd
• Even
Even
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