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

Basic Principles of Serial Data Transmission
2.8 Configuration data
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
Data flow control Defines which data flow control procedure
is used.
XON character Code for XON character
1
XOFF character Code for XOFF character
1
Waiting for XON after Period of time for which the
XOFF (wait time for communication processor should wait for
CTS = ON) the XON code or for CTS="ON" of the
2
communication partner when sending.
Clear RTS time Time allowed to elapse after the
3
transmission before the communication
processor sets the RTS line to OFF.
Data output wait time Time that the communication processor
3
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.
Only for data flow control with XON/XOFF.
1
Only for data flow control with XON/XOFF or CTS/RTS.
2
Only for automatic control of the RS 232C accompanying signals.
3
Depending on whether you set 7 or 8 data bits for the character frame.
4
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".
90
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Range of values
None
•
XON/XOFF
•
RTS/CTS
•
Automat. control of V24
•
signals
With 7 data bits:
•
0 to 7FH (hex)
• With 8 data bits:
0 to FFH (hex)
With 7 data bits:
•
0 to 7FH (hex)
With 8 data bits:
•
0 to FFH (hex)
20 ms to 655350 ms
in 10 ms increments
0 ms to 655350 ms
in 10 ms increments
0 ms to 655350 ms
in 10 ms increments
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
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Default value
None
11 (DC1)
4
4
13 (DC3)
4
4
20000 ms
10 ms
10 ms
Manual, 09/2008, A5E02191071-01