osmo-bsc/doc/legend_for_ladder_diagrams.msc

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msc {
A [label="FSM instance"],B [label="FSM instance"], C [label="remote program"];
|||;
||| [label="LADDER DIAGRAM LEGEND"];
|||;
A rbox C [label="Group Heading"];
A box A [label="function call or action"];
A -> B [label="event within program"];
B abox B [label="enter FSM state"];
B => C [label="network protocol message"];
...;
... [label="asynchronous wait time"];
...;
B <= C [label="network protocol message"];
|||;
||| [label="continue synchronously"];
|||;
A <- B [label="event within program"];
A rbox A [label="flow detail: 'continue at...'"];
...;
...;
--- [label="IF conditional"];
||| [label="..."];
--- [label="END: conditional"];
...;
B note B [label="arbitrary prose"];
}