At 07:47 AM 10/14/97 -0500, you wrote:
>I am using several PIC's for a control system.  The PIC's will be using the
>USART to communicate between each other and a PC.  One of the PIC's is  the
>controller, the other PIC's and the PC are "control input stations".  I was
>wondering if anyone has done a simple comm scheme.  I know I can do it by
>polling the stations from the "controller".  I would like something that
>allowed faster response.  For example, if a user adjusts a control, in the
>polling scheme it will have to wait till the next time that station is
>polled to update the "controller".  Polling stations that do not have data
>seems like a waste of time.  BTW polling limits my devices to about 12 if I
>can tolerate a 500msec delay from input to response (this is really kinda
>high for this application).  I would like to handle more devices and have
>better response time.  The user can only update things so fast.  Typically
>ony a few users would be adjusting thier controls at the same time.  I have
>some ideas of how to solve this but would like some more solutions from the
>great minds out there on the list.

Norm,

Talk to me offline about this one.  Have done it, works nicely.

Andy


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Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
          Hardware & Software for Industry & R/C Hobbies
        "Go fast, turn right, and keep the wet side down!"
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