Table 2- 6 Baud Rate/Character Frame (3964(R) Procedure) - Siemens Simatic S7-300 CP 341 User Manual

Basic Principles of Serial Data Transmission
2.8 Configuration data
Baud rate/Character frame
The table below describes the baud rate/character frame.
Table 2- 6 Baud rate/Character frame (3964(R) procedure)
Parameters Description
Baud rate Data transmission rate in bps (baud)
Note:
A maximum of 19200 baud is possible for the 20mA-TTY
interface.
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, the stop bits are appended to every
character to be sent; this signals the end of a 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 state. This improves
data integrity.
"No" parity means that no parity bit is sent.
Priority A partner has high priority if its send request takes precedence
over the other partner's send request. A partner has low priority if
its send request has to wait until the other partner's send request
has been dealt with. With the 3964(R) procedure, you must
configure both communication partners with different priorities,
i.e., one partner is assigned high priority, the other low.
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CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Range of values Default value
300
• 9600
600
•
1200
•
2400
•
4800
•
• 9600
19200
•
• 38400
57600
•
• 76800
115200
•
1 (fixed value) 1
7
• 8
8
•
1
• 1
2
•
None
• Even
Odd
•
Even
•
Low
• High
High
•
Manual, 09/2008, A5E02191071-01
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