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While IEEE 488.2 provided a device-independent syntax, there was still no standard for instrument-specific commands. Commands to control the same class of instrument, e.g., multimeters, would vary between manufacturers and even models. The United States Air Force,<ref>Project Mate in 1985</ref> and later Hewlett-Packard, recognized this problem. In 1989, HP developed their TML language<ref>{{cite web |title=GPIB 101, A Tutorial of the GPIB Bus |publisher=ICS Electronics |url=http://www.icselect.com/ab_note.html#anchor338658 |page=5, paragraph=SCPI Commands}}</ref> which was the forerunner to SCPI.
The [[International Electrotechnical Commission|IEC]] developed their own standards in parallel with the IEEE, with IEC 60625-2-1993 (IEC 625). In 2004, the IEEE and IEC combined their respective standards into a "dual logo" IEEE/IEC standard '''IEC 60488-2-2004''','' Part 2: Codes, Formats, Protocols and Common Commands'',<ref name="488.2-1992-spec">{{cite book |title=Standard Digital Interface for Programmable Instrumentation- Part 2: Codes, Formats, Protocols and Common Commands (Adoption of (IEEE Std 488.2-1992) |publisher=IEEE |doi=10.1109/IEEESTD.2004.95390 |hdl=11059/14380 |isbn=978-0-7381-4100-8 }}</ref> replaces IEEE 488.2-1992 and IEC 60625-2-1993.<ref>{{cite web |title=Replaced or Withdrawn Publications |url=http://www.iec.ch/cgi-bin/procgi.pl/www/iecwww.p?header=IEC&search=replaced&wwwprog=sea22.p |publisher=IEC |access-date=2010-02-06 |url-status=dead |archive-url=https://
== Command syntax ==
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