Siemens Simatic S7-300 CP 341 - Table 2- 13 Data Flow Control (ASCII Driver)

Basic Principles of Serial Data Transmission
2.8 Configuration data
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
90 Manual, 09/2008, A5E02191071-01
Data flow control
The table below contains a description of the parameters for data flow control.
Data flow control is not possible with the RS 485 interface. Data flow control with "RTS/CTS"
and "automatic operation of V24 signals" is only supported at the RS 232C interface (see
section " Possible applications for the CP 341 (Page 17) ").
Table 2- 13 Data flow control (ASCII driver)
Parameters Description Range of values Default value
Data flow control Defines which data flow control procedure
is used.
• None
• XON/XOFF
• RTS/CTS
• Automat. control of V24
signals
None
XON character
1
Code for XON character
• With 7 data bits:
0 to 7FH (hex)
4
• With 8 data bits:
0 to FFH (hex)
4
11 (DC1)
XOFF character
1
Code for XOFF character
• With 7 data bits:
0 to 7FH (hex)
4
• With 8 data bits:
0 to FFH (hex)
4
13 (DC3)
Waiting for XON after
XOFF (wait time for
CTS = ON)
2
Period of time for which the
communication processor should wait for
the XON code or for CTS="ON" of the
communication partner when sending.
20 ms to 655350 ms
in 10 ms increments
20000 ms
Clear RTS time
3
Time allowed to elapse after the
transmission before the communication
processor sets the RTS line to OFF.
0 ms to 655350 ms
in 10 ms increments
10 ms
Data output wait time
3
Time that the communication processor
should wait when transmitting for the
communication partner to set CTS to ON
after setting the RTS line to ON and before
starting the transmission.
0 ms to 655350 ms
in 10 ms increments
10 ms
1
Only for data flow control with XON/XOFF.
2
Only for data flow control with XON/XOFF or CTS/RTS.
3
Only for automatic control of the RS 232C accompanying signals.
4
Depending on whether you set 7 or 8 data bits for the character frame.
Further information
Additional information regarding data flow control with XON/XOFF or RTS/CTS and
automatic control of the RS 232C accompanying signals can be found in Section " Data
Transmission with the ASCII Driver (Page 62) " starting at "RS 232C Accompanying
Signals".
该文档是极速PDF编辑器生成，
如果想去掉该提示,请访问并下载：
http://www.jisupdfeditor.com/
长沙工控帮教育科技有限公司
www.gkbpx.com