Yes, it does output LCD segments instead of something sensible.

Similar to the Radio Shack meter, but not compatible.  There's 14 bytes of
data, I think the Radio Shack has 9.

I have the Radio Shack meter too.  They're pretty similar, it wouldn't
surprise me if they were the same chipset with slightly different
strappings.


Tony Vandiver-2 wrote:
> 
> Did the TP4000ZC output the bit pattern shown on the LCD like the radio 
> shack meter does?
> 
> Tony
> 
> 
> late4dinner wrote:
>>
>> 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
>>> -- 
>>> http://www.piclist.com PIC/SX FAQ & list archive
>>> View/change your membership options at
>>> http://mailman.mit.edu/mailman/listinfo/piclist
>>>
>>>
>>>     
>>
>> 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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> 

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