This is a fairly simple program which receives the data stream from a Mastech MS2115B meter and outputs it to either the console or to a GUI as a sequence of decoded values. The data rate is determined by the meter, but there will typically be an update a couple of times a second.
This tries- usually successfully- to work out which USB/serial port is connected to the meter. Because this uses a lot of OS-specific stuff it is not anticipated that it will be easily portable to anything except Linux, but the remainder of the program should be more tolerant. If the port can't be determined automagically, then it must be specified explicitly (on the command line as the final parameter, or using the GUI menu).
The console output is basically a timestamped line showing the meter's current range and value. Alternatively, the -F or --format parameter can take a printf-style string, in which case the value (and only the value) is output formatted as specified. If the -F parameter is @, then raw hex-formatted packets are output.
In a more general case, use %x@yBzd or %x@yLzd to go to offset x in the received message and extract y bytes of big/little-endian data with C-style format %zd etc. There's lots more possibilities to allow the reading to be scaled and offset using postfix (RPN) operations, please refer to the source for details.
The console-only variant of the program may be compiled using the included makefile. The GUI variant, which can also run as a console program, may be compiled using the included Lazarus project (.lpi) file. Any references to the Lazarus source files are cosmetic, and may be excised (see inifilesabout.pas) without affecting core functionality.
The GUI variant of the program has menu entries for logging data values as they arrive and dumping accumulated data (around 1000 lines of text are saved internally and around 100 graphical points). The code to implement these facilities has not yet been done, in part because I've not worked out what formats I want.
There are also limited SCPI server capabilities, by default responding to a blank line or help by listing the understood commands.
