Configuring and Parameter Assignment the CP 440
5.4 Configuration data
Point-to-point connection CP 440 Installation and Parameter Assignment
Manual, 09/2007, A5E00057742-03
73
Data Flow Control
The table below contains descriptions of the parameters for data flow control. Data flow
control is only possible when "Full Duplex (RS 422) Four-Wire Mode Point to Point" is set.
Table 5-7
Data flow control (ASCII driver)
Parameters
Description
Value Range
Default Value
Data Flow Control
Defines which data flow control
procedure is used.
•
None
•
XON/XOFF
none
XON character
(1)
Code for XON character
•
with 7 data bits:
0 to 7FH (Hex)
(2)
•
with 8 data bits:
0 to FFH (Hex)
(2)
11 (DC1)
XOFF character
(1)
Code for XOFF character
•
with 7 data bits:
0 to 7FH (Hex)
(2)
•
with 8 data bits:
0 to FFH (Hex)
(2)
13 (DC3)
Waiting for XON after
XOFF (wait time for
CTS=ON)
(1)
Period of time for which the CP 440
should wait for the XON code or for
CTS="ON" of the communication partner
when sending.
•
20 ms to 65535 ms
in 10-ms increments
20000 ms
(1)
Only for data flow control with XON/XOFF.
(2)
Depending on whether you set 7 or 8 data bits for the character frame.
Receive Buffer on CP
The following table describes the parameters for the CP receive buffer.
Table 5-8
Receive Buffer on CP (ASCII Driver)
Parameters
Description
Value Range
Default Value
Delete CP receive
buffer at startup
During power up or during transition of the CPU from
STOP to RUN the CP receive buffer is deleted.
•
Yes
•
No
No
Buffered receive
message frames
You can specify the number of receive message
frames to be buffered in the CP receive buffer or to
use the whole buffer. If you use the whole buffer of
2000 bytes, the number of buffered receive message
frames depends only on the length of the frames.
If you specify "1" here and deactivate the following
parameter "prevent overwrite" and cyclically read the
received data from the user program, a current
message frame will always be sent to the CPU.
•
1 to 10
•
Use whole buffer
Use whole
buffer
Prevent overwrite
You can use this parameter to prevent data in the
receive buffer being overwritten when the buffer is full.
•
Yes
•
No
Yes
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