Tenma 72-7730 and 72-7732A multimeter

I am trying to use a 72-7730 and 72-7732A multimeters USB interfaces at the same time., however even when I run a copy of each the 72-7730 and 72-7732A windows application they will only talk to one of the multimeters (they both communicate to the same DMM). How do I communicate with both DMMs at the same time?

Do you have labview drivers so i can write my own application?

Many thanks

Steve

0 clem57 over 10 years ago

The drivers for these are closed sourced, so they cannot be changed. sorry
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0 stevedoddsdesignltd over 10 years ago in reply to clem57

OK. How do I use two multimeters at the same time with their USB interface and the provided PC application?
Thank you
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0 dougw over 10 years ago

Here is a user who seems to have figured out how to communicate without the factory drivers...
https://relavak.wordpress.com/2009/10/04/tenma-72-7730-in-linux/
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0 clem57 over 10 years ago in reply to dougw

Thanks Doug for the great answer. Seems like this comment says it all:

Bill Cooper Says:

February 2, 2015 at 11:34 am | Reply

If you place an IR receiver against the transmitter you’ll find it’s a very simple rs232 comms format, 2400,7,1,none and no handshake (of course) you get back a string of 11 bytes first 5 are the reading 6th = decimal point position, with the rest being for range etc. feed this data into any terminal program to decode the last bytes – why even try to reverse engineer the USB? all sorted in a few hours. For my IR device I merely placed the anode to pin 4 of a 9 pin female and the cathode to pin 2 ( i found a regular + 6volts on pin 4!

Happy days!
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