Siemens Simatic S7-400 - Consistent Data Read;Write

3964(R) procedure with default values
Max. message frame
length
400 bytes (see chapter "Overview of the Function Blocks (Page 73)")
Parameter 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 speci󹪝cations ASCII driver
The following table contains the technical speci󹪝cations of the ASCII driver.
Table 10-3 Technical speci󹪝cations of the ASCII driver
ASCII driver
Max. message frame
length
400 bytes (see chapter "Overview of the Function Blocks (Page 73)")
Parameter 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 "󹪞ow control" = "XON/XOFF")
• Wait for XON after XOFF (waiting time for CTS=ON): 20 ms to 65530 ms
in 10-ms increments
• Number of bu󹪜ered message frames: 1 to 10, use entire bu󹪜er
• 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 󹪝xed number of characters
ASCII driver with end of message frame recognition after character delay time expires
Parameter No further parameter assignment necessary. End of message frame is rec‐
ognized when the con󹪝gured character delay time expires.
ASCII driver with end of message frame recognition by assigned parameters end character
Technical speci󹪝cations
10.1 Technical Speci󹪝cations of the CP 440
Point-to-point connection CP 440 Installation and Parameter Assignment
Equipment Manual, 03/2022, A5E00057742-AE 119