KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 3.12 (Unit Rev 2) - Manual (Page 45)

SERIES EL 070110
3-11
3.10.3.9 STATUS SUBSYSTEM
This subsystem programs the Series EL status register. The electronic load has two groups of
status registers: Operation and Questionable. Each group consists of three registers: Condition,
Enable, and Event.
3.10.3.10 SYSTEM SUBSYSTEM
This subsystem controls various system functions.
3.10.4 PROGRAM MESSAGE STRUCTURE
SCPI program messages (commands from controller to load) consist of one or more message
units ending in a message terminator. The message terminator is not part of the syntax; it is
defined by the way your programming language indicates the end of a line: “newline” must be
defined as CR (0D
H
) followed by LF (0A
H
). The message unit is a keyword consisting of a single
command or query word followed by a message terminator (e.g., CURR? or
INPut). The message unit may include a data parameter after the keyword sepa-
rated by a space; the parameter is usually numeric (e.g., CURR 5), but may also be a
string (e.g., OUTP ON). Figure 3-3 illustrates the message structure, showing how
message units are combined. The following subparagraphs explain each component of the
message structure.
NOTE: An alternative to using the message structure for multiple messages defined in the fol-
lowing paragraphs is to send each command as a separate line. In this case each com-
mand must use the full syntax shown in Appendix B.
FIGURE 3-3. MESSAGE STRUCTURE
CURR:RANG 1;:OUTP ON;:CURR?
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