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Computer, PC Coupling
Behaviour Upon Errors in Data Transmission
Upon errors in data transmission, transmitter repeats sending various times.
Repeats always start from enquiry.
Synchronization, Monitoring Times, Repeats
n
Acknowledgement monitoring time
n
Response monitoring time
n
Enquiry monitoring time
n
Max. number of enquiry repeats:
n
Max. number of data repeats
Sending Priority
DISOMAT always has low priority. If both stations try to start data communication,
DISOMAT aborts sending and goes to receiving state.
Value Range
The value range of transmitted characters of a data section covers 8 bits, i.e. in
hexadecimal representation 00 to FF.
This value range requires a special treatment of user datas' end code (<DLE>), if
the bit string of the <DLE> character is included in user data. This is done by
doubling the <DLE> character.
<DLE> Doubling
<DLE> occurring in user data is doubled by transmitter, for receiver to com-
pletely receive user data.
If two <DLE> codes are received, receiver resets doubling and treats <DLE> as
data byte.
DISOMAT Opus, Satus, Tersus, Data Communication
© Schenck Process
tq = 2 sec.
ta = 5 sec.
te = 2 sec.
5
5
BV-H2359GB/0902
4.1 Protocols
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