Experimental Physics and
Industrial Control System

> What record type do you use to represent your state?
>
> In the CA server, updates for strings are handled using a reference (pointer) in the queue, while numerical type updates put their value in the queue.
> If your record has a string value, two fast subsequent writes to it may actually lead to the first string never being sent, if it gets overwritten while the event with the pointer to it is still in the outgoing queue. In that case, it might be better to use an mbbi or mbbo (enum type) record, because an enum's natural type is numerical, while it still has nice string representations for its states.

The state machine is already built up with mbbi and mbbo records.

Here is an excerpt  of the state machine. Maybe this helps to discover some misbehavior:
> state S_READY {
>     entry {
>         // some logging
>     }
>     when(pv_state_request == STATE_RUNNING) {
>     } state S_STARTING
> }
> state S_STARTING {
>     entry {
>         // some logging
>     }
>     when(pv_allow_running) { // this pv is in most cases already 1.
>     } state S_RUNNING
> }
> state S_RUNNING {
>     entry {
>         // some logging
>     }
>     …..
> }
S_ = states
STATE_ = enum values

BTW: In order to use logging, this state machine is implemented in C++.