Table of Contents
Advertisement
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
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 CP 440
XOFF (wait time for
should wait for the XON code or for
CTS=ON)
CTS="ON" of the communication partner
(1)
when sending.
Only for data flow control with XON/XOFF.
(1)
Depending on whether you set 7 or 8 data bits for the character frame.
(2)
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
Delete CP receive
During power up or during transition of the CPU from
buffer at startup
STOP to RUN the CP receive buffer is deleted.
Buffered receive
You can specify the number of receive message
message frames
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.
Prevent overwrite
You can use this parameter to prevent data in the
receive buffer being overwritten when the buffer is full.
Point-to-point connection CP 440 Installation and Parameter Assignment
Manual, 09/2007, A5E00057742-03
www.gkbpx.com
Configuring and Parameter Assignment the CP 440
Value Range
None
•
XON/XOFF
•
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 65535 ms
•
in 10-ms increments
5.4 Configuration data
Default Value
none
11 (DC1)
(2)
(2)
13 (DC3)
(2)
(2)
20000 ms
Value Range
Default Value
Yes
•
No
No
•
1 to 10
•
Use whole
buffer
Use whole buffer
•
Yes
•
Yes
No
•
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/
73
Advertisement
Table of Contents
