I've made software for reading the data from the cheap digital LCR 612
(approx. 110 EUR) from www.tecpel.com with posix commands
via a serial port.
Tested with Linux, should work with every posix conforming operating system and Cygwin.
The manual and data sheet can be found here: http://www.tecpel.net/LCR-612.html
With my USB-RS232 (USB to Serial Adapter) adapter with an Pl2303 (driver pl2303) i've got the problem
that this adapter does nothing after somes hours and a user (Stephan R.)
reported defect checksums and lost bytes with such an adapter while
communication works without problems with an onboard serial port.
I'm using an USB to Serial Adapter with an FTDI chip (driver ftdi_sio, chip FT232BM) without problems.