Siemens SIMATIC S7-400 Equipment Manual page 119

3964(R) procedure with default values
Max. message frame
length
Parameter
Technical specifications ASCII driver
The following table contains the technical specifications of the ASCII driver.
Table 10-3
ASCII driver
Max. message frame
length
Parameter
ASCII driver with end of message frame recognition after character delay time expires
Parameter
ASCII driver with end of message frame recognition by assigned parameters end character
Point-to-point connection CP 440 Installation and Parameter Assignment
Equipment Manual, 03/2022, A5E00057742-AE
400 bytes (see chapter "Overview of the Function Blocks (Page 73)")
can be assigned parameters:
• With/without block check character
• Priority: low/high
• Transmission rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 76800, 115200 bps
• Character frame: 9, 10, 11 or 12 bits
• Character delay time: 20 ms to 65530 ms in 10 ms increments
• Acknowledgment delay time: 20 ms to 65530 ms in 10 ms increments
• Number of connection attempts: 1 to 255
• Number of transmission attempts: 1 to 255
• Initial state of receive line: none, R(A)5V/R(B)0V, R(A)0V/R(B)5V
Technical specifications of the ASCII driver
400 bytes (see chapter "Overview of the Function Blocks (Page 73)")
can be assigned parameters:
• Transmission rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 76800, 115200 bps
• Character frame: 9, 10, 11 or 12 bits
• Character delay time: 1 ms to 65530 ms in 1-ms increments
• Flow control: none, XON/XOFF
• XON/XOFF characters (only with "flow control" = "XON/XOFF")
• Wait for XON after XOFF (waiting time for CTS=ON): 20 ms to 65530 ms
in 10-ms increments
• Number of buffered message frames: 1 to 10, use entire buffer
• Disable overwrite: yes/no
• Indicator for end of receive message frame:
– After character delay time expires
– On receipt of end-of-text character(s)
– On receipt of a fixed number of characters
No further parameter assignment necessary. End of message frame is rec‐
ognized when the configured character delay time expires.
Technical specifications
10.1 Technical Specifications of the CP 440
119