Siemens Simatic S7-300 CP 341 - Figure 2-14 Sequence of a Continuation SEND Message Frame with a Continuation Response Message Frame

Basic Principles of Serial Data Transmission
2.5 Data Transmission with the RK 512 Computer Connection
CP 341 Point-to-Point Communication, Installation and Parameter Assignment
Manual, 09/2008, A5E02191071-01 55
Continuation SEND message frames
A continuation SEND message frame is started if the volume of data exceeds 128 bytes. The
sequence is the same as for the SEND message frame.
If more than 128 bytes are sent, the extra bytes are automatically transmitted in one or more
continuation message frames.
The figure below shows the transmission sequence when sending a continuation SEND
message frame with a continuation response message frame.
'/(
(7;
%&&

'/(
'/(
67;
'/(
(7;
'/(
'/(
67;
%&&
WK%\WH
UG%\WH
QG%\WH
VW%\WH
WK%\WH
%\WHbQ
ವ
ವ
VW%\WH
UG%\WH
QG%\WH
WK%\WH
WK%\WH
&RPPXQLFDWLRQ
SDUWQHUV
&3
8VHUGDWD
&RQWLQXDWLRQ6(1'IUDPH
6WDUWFKDUDFWHU+
3RVDFNQRZOHGJHPHQW+
&RQWLQXDWLRQIUDPH))+
6(1'UHTXHVW+
'DWDEORFN+
WK'DWDE\WH
WK'DWDE\WH
QWKGDWDE\WH
(QGGHOLPLWHU+
(QGGHOLPLWHU+
3RVDFNQRZOHGJHPHQW+
&RQWLQXDWLRQUHVSRQVHIUDPH
6WDUWFKDUDFWHU+
3RVDFNQRZOHGJHPHQW+
&RQWLQXDWLRQUHVSRQVH
IUDPH))+
(UURUQXPEHU+
(QGGHOLPLWHU+
(QGGHOLPLWHU+
2QO\ZLWKEORFNFKHFN
3RVDFNQRZOHGJHPHQW+
&RQQHFWLRQ
VHWXS
0HVVDJH
IUDPH
KHDGHU
&RQQHFWLRQ
WHUPLQDWLRQ
&RQQHFWLRQ
VHWXS
5HVSRQVH
IUDPH
KHDGHU
&RQQHFWLRQ
WHUPLQDWLRQ
+
+
ವ
ವ
+
2QO\ZLWKEORFNFKHFN
Figure 2-14 Sequence of a continuation SEND message frame with a continuation response
message frame
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