KEPCO TMA VXI-27 - Manual (Page 32)

TMA VXI -27 101602
3-15
by the colon in front of OPER?. Thus you can combine the following message units
STAT:OPER? and STAT:PRES;
STAT:OPER:COND?;ENAB 16<NL>
After the OPER:COND? message unit, the parser moves in one level from OPER, allowing the
abbreviated notation for STAT:OPER:ENAB.
3.5.8 PROGRAM MESSAGE SYNTAX SUMMARY
• Common commands begin with an asterisk (*).
• Queries end with a question mark (?).
• Program messages consist of a root keyword and, in some cases, one or more message
units separated by a colon (:) followed by a message terminator. Several message units
of a program message may be separated by a semicolon (;) without repeating the root
keyword.
• If a program message has more than one message unit, then a colon (:) must precede
the next keyword in order to set the parser back to the root (otherwise the next keyword
will be taken as a subunit of the previous message unit).
e.g., the command meas:volt?;curr? will read output voltage and output current
since both volt? and curr? are interpreted as subunits of the meas command.
• Several commands may be sent as one message; a line feed terminates the message.
Commands sent together are separated by a semicolon (;). The first command in a mes-
sage starts at the root, therefor a colon (:) at the beginning is not mandatory.
e.g., the command meas:volt?;:curr? will read output voltage and programmed cur-
rent since the colon preceding curr? indicates that curr? is not part of the meas com-
mand and starts at the root.
• UPPER case letters in mnemonics are mandatory (short form). Lower case letters may
either be omitted, or must be specified completely (long form)
e.g., INSTrument (long form) has the same effect as INST (short form).
• Commands/queries may be given in upper/lower case (long form)
e.g., SoUrCe is allowed.
• Text shown between brackets [] is optional.
e.g., :[SOUR]VOLT:[LEV] TRIG has the same effect as :VOLT TRIG
3.5.9 STATUS REPORTING
The status reporting of the TMA VXI-27 follows the SCPI and IEEE 488.2 requirements. The
serial poll response of the TMA VXI-27 provides summary bits of the status and error reporting
system. The simplest status report is the command valid reporting and data availablity, This
successful decoding of a command string generates no error and is indicated by the bit 3 of the
serial poll response being a zero. The setting of bit 4 in the status byte indicates data is avail-
able to the controller in response a command query message.