INFICON PSG55x ATM to Medium Vacuum Gauge (Profibus) - Manual (Page 18)

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tira56e1 (2010-02) PxG55x.cp
The following sequence diagram contains an example parameter request by the
cyclic DP master in order to illustrate the application of parameter channel.
AK(RS) = 0
PxG55x DP-Master
AK(RS) = 0
AK (IS) = 1
AK(RS) = 1
AK (IS) = 1
Parameter
Request
(Client)
AK(RS) = 0
AK (IS) = 1
AK(RS) = 0
AK (IS) = 0
AK(RS) = 0
Store
Data
AK (IS) = 0
AK(RS) = 0
Parameter
Request
(Server)
AK(IS) = 0
AK(IS) = 0
Fetch
Data
The master must mark the end of the instruction cycle by setting AK to zero. Only
after that, a new instruction/response cycle may be started.
4.3.4 Sequence Diagram