XPS/XPS-E User's Manual Contents
COMSOFT 17
The telegrams mentioned above can either be started automatically by the
Master (cyclically during automatic polling) or by the application.
The receive request number (X) in Poll Mode may not be set.
❶ The data_exchange.req telegram is sent to XPS/XPS-E. XPS/XPS-E
has already received the first characters at the interface. It returns them in
the response telegram
data_exchange.res to the Master. The
confirmation is incremented by 1 and the length of the reception data is
entered. Moreover, the status (S) of XPS/XPS-E is returned.
❷ New data_exchange.req telegram. XPS/XPS-E returns the new data
by incrementing the confirmation number by 1.
❸ As response telegram to the data_exchange.req telegram,
XPS/XPS-E enters the old confirmation number as no new data has been
received at the serial interface. The receive data length is set to 0.
❹ XPS/XPS-E has again received new data. The confirmation number is
incremented by one and the data returned correspondingly by the
data_exchange.res telegram to the Master.
If no time guarantee can be given and if data loss has to be excluded under all
circumstances, XPS/XPS-E must be run in the request mode.
Note:
To Next Page
Loading...
General