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???
05/13/09 04:46
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 		 #165283 - Re: I had done something like this in past
Responding to: ???'s previous message
Hi Mahesh,

Thank you very much to your detailed answer.

Actually, the controller A, I have mentioned, use RS485 COM to communicate with up to 5 other controllers (e.g. A1 to A5).

As a result I have been able to design a remote circuit board (called board M, could be mounted 1,250 meters away from the group) that captures all of the data sending between those 6 controllers and display on the LCD of board M.

The reason why I consider to design board B and probably board C as well, is to replay whatever message display on the LCD of board A which is not sending via the RS485, without disturbing board A.

Note that board A and A1-A5 have almost hit their hardware and software limitation...

Thanks,
Giang


List of 24 messages in thread
TopicAuthorDate
How to read and redisplay from LCD databus?            01/01/70 00:00      
   Spy on the Data & Control lines            01/01/70 00:00      
      Can be hard to be fast enough            01/01/70 00:00      
   Shouldn't be a problem            01/01/70 00:00      
      some HW might be needed            01/01/70 00:00      
         Monitor the LCD databus then send via 485            01/01/70 00:00      
         I don't see a place for the 805x            01/01/70 00:00      
      Re: Shouldn't be a problem            01/01/70 00:00      
         some basic questions            01/01/70 00:00      
            Re:some basic questions            01/01/70 00:00      
               20 Meters            01/01/70 00:00      
                  Re: 20 Meters            01/01/70 00:00      
      Signal timing and command timing separate issues            01/01/70 00:00      
         Check the datasheet ...            01/01/70 00:00      
            Re: Check the datasheet ... and test on LCD of board B first            01/01/70 00:00      
               A CPLD at each end would do nicely            01/01/70 00:00      
                  Re: A CPLD at each end would do nicely            01/01/70 00:00      
                     it depends on requirements            01/01/70 00:00      
                        Watch out for assumptions about busy            01/01/70 00:00      
                           If that gets to be an issue ...            01/01/70 00:00      
                              slave timing            01/01/70 00:00      
                                 I doubt that will work.            01/01/70 00:00      
   I had done something like this in past            01/01/70 00:00      
      Re: I had done something like this in past            01/01/70 00:00      

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