KEPCO EL Series Electronic Load Operator Manual P/N 243-1295 Firmware Version 4.00 to 4.xx - Manual (Page 53)

SERIES EL 071414
3-17
3.13.6 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.
• 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., PROTection (long form) has the same effect as PROT (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][:AMPL]? has the same effect as :VOLT?
3.13.7 STATUS REPORTING
The status reporting of the EL Series Electronic Load follows the SCPI and IEEE 488.2 require-
ments.
3.13.7.1 STATUS REPORTING STRUCTURE
The status reporting of the EL uses multiple status register sets, illustrated in Figure 3-4. These
register sets are Channel Status, Channel Summary, Questionable, Operation, Standard Event
and Status Byte/Service Request registers. All registers are 16-bit registers except the Standard
Event and Status Byte/Service Request registers which are 8 bits. The Channel Status, Opera-
tion Status and Questionable registers all have condition registers which are associated with
two related registers: an event register which holds unlatched events reported in real-time by
the instrument and is cleared by reading the register, and an enable register which allows the
contents of the event register to be passed through to set the associated condition register.
3.13.7.2 STANDARD EVENT STATUS REGISTER
The Standard Event registers contains bits (condition register) is as follows:
• 0 - OPC — Operation Complete
• 1 - Not Used — always zero.
• 2 - QYE — Query Error
• 3 - DDE — Device Dependent Error
• 4 - EXE — Execution Error
• 5 - CME — Command Error
• 6 - Not Used — always zero.
• 7 - PON — Power On since this bit last read