KEPCO TMA VXI-27 - Manual (Page 28)

TMA VXI -27 101602
3-11
FIGURE 3-5. MESSAGE STRUCTURE
3.5.4.1 KEYWORD
Keywords are instructions recognized by a decoder within the TMA VXI-27, referred to as a
“parser.” Each keyword describes a command function; all keywords used by the TMA VXI-27
are listed in Figure 3-4.
Each keyword has a long form and a short form. For the long form the word is spelled out com-
pletely (e.g., STATUS, OUTPUT, VOLTAGE, and TRIGGER are long form keywords). For the
short form only the first three or four letters of the long form are used (e.g., STAT, VOLT, OUTP,
and TRIG). The rules governing short form keywords are presented in Table 3-4.
TABLE 3-4. RULES GOVERNING SHORTFORM KEYWORDS
IF NUMBER OF LETTERS IN
LONGFORM KEYWORD IS:
AND FOURTH LETTER
IS A VOWEL?
THEN SHORT FORM
CONSISTS OF:
EXAMPLES
4 OR FEWER (DOES NOT MATTER) ALL LONG FORM LETTERS MODE
5 OR MORE NO
THE FIRST FOUR
LONG FORM LETTERS
MEASure, OUTPut, EVENt
5 OR MORE YES
THE FIRST THREE
LONG FORM LETTERS
LEVel, IMMediate, ERRor
CURR:LEV 3.5;:OUTP ON;:CURR?<NL>
MESSAGE TERMINATOR
KEYWORD
QUERY INDICATOR
ROOT SPECIFIER
MESSAGE UNIT SEPARATOR
DATA
KEYWORD
KEYWORD
KEYWORD SEPARATOR
KEYWORD
MESSAGE UNIT SEPARATOR
DATA
MESSAGE UNIT
DATA SEPARATOR
DATA SEPARATOR
ROOT SPECIFIER