Re: Multiple device support for a record type

[Ralph Lange <ralph.lange@gmx.de>]

Hi Stefen,

On 11/08/2016 12:39, Stefen Paul wrote:
> I've built device support for ai record for a vme based ADC board.
> I've used the following to add the support:
>     device(ai,VME_IO, devAiADCtype1, "HW Channel");
>
> Now I want to build device support for ai record to support one more 
> type of vme based ADC board to be used in the same system.
> How do I do it ? Should I write something like :
>     device(ai,VME_IO, devAiADCtype2, "HW Channel 2");

Yes, that's the way.

The constraint is that the combination of tag ("HW Channel") and record 
type must be unique.
I.e. you can and should support multiple record types for the same 
hardware using a single tag.

Please use something descriptive as the tag, e.g. for a VME-6854 card by 
MyCorporation something like "MyCorp VME-6854".

If you have multiple functionalities in one support (for one hardware) 
that map to the same record type, e.g. different configuration options 
and digital outputs that all use a bo record, the distinction is usually 
done by a tag in the free text part of the INP/OUT link.
If you need to code more configuration inside a single record instance 
than the free text allows, you can add info() structures to the record. 
(Be aware, though, that info structures are not visible remotely through 
Channel Access.)

Cheers,
~Ralph