I agree.
Vitaliy
Taylan Akdogan wrote:
>On Fri, 27 Feb 2004, vitaliy ziskin wrote:
>
>
>> I'm not sure if that is possible. Scalers get their TTL signal from
>>this ribon cable which comes staright from the ABS rack 13 (lucky
>>number). To do what you are sugesting we need to make another scaler
>>channel (another epics channel is easy) , do we have an exra one.
>>
>>
>
>That's exactly my point. Why do we use the epics for this
>purpose? The hardware signal is out there already! Delivering a
>signal through epics is equivalent of introducing more breakable
>points along the way. The Flip-Odd signal we produce is already a
>TTL signal.
>
>As for the epics channel: Of course it doesn't hurt to have this
>one as well. What I am suggesting is that we should use a
>hardware signal read by a device and distributed by the epics,
>instead of a software bit that we can set (means any other
>software can change it - not error-prone).
>
>And, that kind of channel is already in place; no software is
>involved (other than epics server, off course), it is read
>directly from the hardware signal. It is called
>"sp2_6034e:flip_odd".
>
>Thus, the conflict is not whether it is doable or not, but
>finding the best approach. I vote for using directly the TTL
>signal from the Compton electronics for scaler normalization.
>
>Correct me if I'm wrong: The current setup is as follows:
>
>1) Compton Controller flips the spin.
>2) The flip-odd TTL signal is generated by the compton
> electronics.
>3) Compton controller sets the proper epics bit according to the
> flip-odd state.
>4) A digital I/O board (call it an out-register) produces a TTL
> signal that supplies the scalers.
>
>We can eliminate item 2&3 by using directly the TTL hardware
>signal produced by the item-2. And, there is already an epics
>channel that reads the same TTL signal produced by item-2.
>
>(Finding a proper cable for the scaler channel is a small
>detail.)
>
>Maybe, I'm missing something, let's discuss this on
>paper/electronics.
>
>Cheers,
>Taylan
>
>---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
>Taylan Akdogan Massachusetts Institute of Technology
>akdogan@mit.edu Department of Physics
>Phn:+1-617-258-0801 Laboratory for Nuclear Science
>Fax:+1-617-258-5440 Room 26-402b
>---=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=---
>
>
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