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VIPA System 300S
6.2 ASCII
Mode of operation
Proceeding
HB130 | CP | 341-1CH01 | en | 18-40
n
ASCII data communication is one of the simple forms of data exchange that may be
compared to a multicast/broadcast function.
n
Individual messages are separated by means of character delay time (ZVZ). Within
this time the transmitter must have sent its telegram to the receiver. A telegram is only
passed on to the CPU if this was received completely.
n
Additionally to the character delay there is a further possibility to define an end crite-
rion by parameterization of the ASCII driver.
n
Since during ASCII transmission apart from the usage of the parity bit no further step
takes place for data protection, the data transfer is very efficiently however not
secured. With the parity the inversion of one bit within a character may be secured. If
two or more bits of a character are inverted, this error may no longer be detected.
1.
The parameter plugin "Point-to-Point-Communication, Parameter Assignment" is
started from the properties dialog of the CP by the button [Parameter...].
2.
Here the parameters for transfer protocol, data receipt and interface may be
adjusted.
3.
Set at Protocol the "ASCII" protocol you want.
4.
For parameterization of the protocol click at
ð In the following these parameters are described. Information about this may
also be found in the online help of the parameter plugin.
Communication protocols
.
ASCII
37
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