Add expanded acronyms to the project description

README.md

 # DS1054Z_screen_capture
 'OscScreenGrabLAN.py' is a Python script that captures
-whatever is displayed by the screen of a Rigol DS1000Z series oscilloscope.
-To achieve this, SCPI commands are sent from the computer to the oscilloscope using the LXI protocol.
-The computer and the oscilloscope are connected together by a LAN.
-No USB, no VISA, no IVI and no drivers are required.
+whatever is displayed on the screen of a Rigol DS1000Z series oscilloscope.
+To achieve this, SCPI (Standard Commands for Programmable Instruments) are sent from the computer
+to the oscilloscope, using the LXI (LAN-based eXtensions for Instrumentation) protocol over a Telnet connexion.
+The computer and the oscilloscope are connected together by a LAN (Local Area Network).
+No USB (Universal Serial Bus), no VISA (Virtual Instrument Software Architecture),
+no IVI (Interchangeable Virtual Instrument) and no Rigol drivers are required.
 Python 2 is required. Python 3 is not supported.
 
 Tested only with Windows 7, Python 2.7.9 and Rigol DS1104Z (a fully upgraded DS1054Z oscilloscope).
 
 Usage:
 ------
-Connect the computer and the oscilloscope together by LAN. Run 'OscScreenGrabLAN.py' in order to capture an image from the oscilloscope display, and save it to the computer disk.
+Install Python 2.7.9 from 'https://www.python.org/downloads'.
+Connect together the computer and the oscilloscope (by LAN).
+In order to capture an image from the oscilloscope display and save it to the computer disk,
+run 'OscScreenGrabLAN.py'.
 
 Example: