KEPCO MBT Series - Manual (Page 104)

3-66
MBTSVC111609
STATus Questionable register for the selected channel. The contents of the STATus Question-
able register can also contain the summary of all instruments as shown in Figure 3-7.
The selection of the status reporting structure is controlled by the SYStem:SET SI (Instrument
Structure) command, either SI0 (off) or SI1 (on). The power-up default is the off condition. To
enable the SCPI compliant mode of operation for multiple logical instruments the user must
send SYSTem:SET SI1 to the MBT-G power supply during initialization. The SI1 state is not
remembered when the unit is turned off. To return to the standard method of reporting the
selected device’s status without turning the unit off, send SYSTem:SET SI0.
When the MBT-G power supply is set up for SCPI compliant status reporting for multiple chan-
nels, the specific instrument’s Questionable register is found in the STAT:QUES:INST:ISUM
register. This register has the same bit structure as the single channel Questionable register.
The ISUM enable register is ANDed with the bits of the channel’s ISUM register and its bit is
placed in the INST register. The Questionable register bits are the logical ORing of all channels’
Questionable ISUM register. This is shown in figure 3-7.
The ISUMmary registers set the INSTrument register, which in turn sets bit 13 of the QUEStion-
able or OPERation status register. This is shown pictorially in Figure 3-7.
The STATUS:QUESTIONABLE and STATUS:QUESTIONABLE:CONDITION registers are the
same in this mode of status reporting. The condition register indicates the status of the various
event registers and bits set are only cleared if the source of the bit is cleared.
FIGURE 3-7. EXPANSION OF QUESTIONABLE REGISTER FOR MULTIPLE LOGICAL INSTRUMENTS