Mark Rages wrote:
> 
> Hi,
> 
> I'm looking for a low-cost data acquisition device. I want to
> interface to one of these meters:
>   Circuit Specialists MAS-345
> http://www.circuitspecialists.com/prod.itml/icOid/4003
> 
> The same looking meter is sold by several vendors:
>   Mastech MAS-343
>   Velleman DVM345DI
>   Global Specialties PRO-70. http://www.globalspecialties.com/pro70.html
> 
> Similar but different:
>   Radio Shack 22-812 (some code at
> http://www.kronosrobotics.com/Projects/rsmeter.shtml )
>   TekPower TP4000ZC
> 
> Anyone have experience interfacing with these? (not using the included
> Windows software.)
> 
> Regards,
> Mark
> markrages@gmail
> -- 
> Mark Rages, Engineer
> Midwest Telecine LLC
> markrages@midwesttelecine.com
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> 

In case anyone is still interested, I've written a simple C program to read
the serial output from the TP4000ZC meter.  I wrote it on Linux, but doesn't
use anything fancier than read(), so it should compile on most platforms
(BSD/Solaris/Windows etc) with little or no effort.

It also documents the protocol for those that want to roll their own.

I suspect the same chip was used in other meters, so other meters with 14
bytes of data may be compatible.

Send mail to mason at steelypip dot org if you'd like a copy, I'm not a
regular user of this forum.

Oh yeah - if you've got one of these meters then open it up and look at the
isolation used on the serial port.  It gave me a laugh.

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