Re: DMM with PC interface com protocol

["Andy Whitfield" <andywhitfield2002@xxxxxxxxxxx>]

Yep comms with the meter is easy.
I've done it in good old BASIC.  ;-)
Andy

--- In ukha_d@xxxxxxx, Kim Wall <kim@...> wrote:
>
> Just to add to this thread:
>
> I've invested in one of these multimeters, and I've just poked
around
> with a serial port sniffer, and it seems that the communication
protocol
> between the meter and the software is trivial:
>
> The software opens the serial port at 600 baud, with 7 data bits,
2 stop
> bits, no parity.  DTR is set, and RTS is cleared (I suspect it
uses
> these lines to power the interface or something, as no handshaking
seems
> to be going on).  To take a reading, the software then sends a
single
> 'D' character, and the meter replies with a human-readable string
giving
> the mode, value and unit, such as "DC  0.000  V",  "OH 
3.772MOhm"
and
> so on.  This is repeated ad infinitum.
>
> So yeah, easy.  A linux program to read the values into a database
is on
> my todo list for next week, but I thought I'd post my findings now
in
> case anyone else wants to write their own software for the thing.
>
> FWIW, the software runs fine for me on my XP Pro/SP2 box, and
seems
> quite usable for general purpose data logging type stuff.
>
> Interface aside, it's not a bad multimeter for 20 quid.
Reasonably
> solid, backlit display, audible continuity, protective yellow
holster
> and pretentious plastic case.  Does exactly what it says on the
tin.
>
>
> Kim.
>