XPS-E
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1. The data_exchange.req telegram is sent to the XPS-E which already
has received the first characters. It returns them, however, only in the
subsequent response telegram data_exchange.res.
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2. New data_exchange.req telegram with increased receive-request
number (further reception command). XPS-E returns the data received
at point in time. The confirmat
ion number is increased by one.
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3. Another reception command to XPS-E (receive-request number has
been increased). The data that are returned are the da
ta received at
point in time.
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4. No further reception command to XPS-E. XPS-E returns again the last
sent data. XPS-E h
as already received new data.
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5. No further reception command to XPS-E. XPS-E re
turns again the last
sent data.
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6. This data_exchange.req contains another reception command. The
data are returned, h
owever, only at the next cycle.
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7. No further reception command because the request number has not
been increased. The data that are returned are the data received until
the point in
time of the last read command
.
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Data exchange