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danielmaclaren merged 1 commit into from
Dec 8, 2025
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Document user long strings #129

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3 changes: 2 additions & 1 deletion doc/system_components/Inst-etc-IOC.md
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Expand Up @@ -5,11 +5,12 @@ PVs which are for instrument level, e.g. motors moving and security pvs

## User variables

There are a host of user variables which are autosaved for the users to set. The number of these is controlled with the macro `NUM_USER_VARS`. There are 3 types:
There are a host of user variables which are autosaved for the users to set. The number of these is controlled with the macro `NUM_USER_VARS`. There are 4 types:

- Integer in `IN:<instrument>:PARS:USER:IX` (X is index)
- Reals in `IN:<instrument>:PARS:USER:RX` (X is index)
- Strings in `IN:<instrument>:PARS:USER:SX` (X is index), NB these are maximum of 40 characters
- Character arrays in `IN:<instrument>:PARS:USER:LSX` (X is index), these are character arrays with a maximum size of 65536 characters

## User Buttons

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