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06.91
Data exchange sequence
The procedure can be split up into three phases:
•
Enquiry phase
•
text transfer phase
•
completion phase
Enquiry phase
MA
SL
ENQ
DLEO
DLE STX Text DLE ETX BCC DLE1
MA : Master station = text transmitting station
SL : Slave station = text receiving station
For more detailed information on the enquiry phase, text transfer phase, completion phase,
repetitions, monitoring times, collisions and data protection please refer to the LSV2 procedure
description in the appendix (Section 9).
The following values of the LSV2 procedure are configurable:
Transmission rate
Priority
Repetitions
Monitoring times
Block length
Acknowledgement delay
© Siemens AG 1989 All Rights Reserved
SINUMERIK 840/880 (PJ)
Text transfer phase
MA
(speed of data transmission)
(master or slave; only valid in case of a conflict)
(number of repetitions after negative or incorrect
acknowledgement in the enquiry and text transfer phases)
(acknowledgement monitoring time for transmitter/receiver and
character delay or character monitoring time)
(128 bytes or 256 bytes)
(with/without)
6FC5 197-0AB20-0BP0
3 Interface Modules
3.3.2 LSV2 procedure
Completion phase
SL
MA
EOT
3–19
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