Lsv2 Procedure - Siemens SINUMERIK 840 Planning Manual

9 Appendix

9.2 LSV2 procedure

9.2 LSV2 procedure
In the following, the individual phases of the LSV2 procedure are described in greater detail.
Procedure representation
The control character sequence is represented in three-column diagrams.
In the left column the station requesting
to send or the text sending station is
entered. The centre column contains the
response of the station on the other end.
In the right column, references to other
responses of the station requesting to
send or the text transmitting station are
entered.
The control characters entered into the
individual columns are sent by the
station which is in the heading of the
column.
If this character is received mutilated by
the other station, the control character is
represented with a line through it.
The course of the procedure is
represented by a line.
The line branches in the case of
possible errors.
If a station does not respond, the line is
drawn without a character being entered.
If a station responds to different error
possibilities in the same way, the
corresponding lines are drawn together.
The diagrams also show monitoring
times. The setting of a monitoring period
is marked by a small circle. The
arrowhead marks the end of this period
and points to the response of the station
which has set the period.
TP =Text transfer phase (data communication phase)
AP =Request phase
9–6
Transm. stat. Receiving stat.
AP ENQ
ENQ
© Siemens AG 1989 All Rights Reserved
Transm. stat.
TP
AP
TP
DLE/O
DLE/O
DLE/O
NAK
AP
DLE/O AP
.
.
.
NAK
T1
6FC5 197-0AB20-0BP0
SINUMERIK 840/880 (PJ)
08.89