IEEE488.2 Commands
Copyright © ITECH Electronic Co., Ltd. 23
When the controller conducts a serial poll in response to SRQ, the RQS bit is
cleared, but the MSS bit is not. When *SRE is cleared (by programming it with
0), the electronic load cannot generate an SRQ to the controller. The query
returns the current state of *SRE.
<NR1> (register binary value)
*STB?
This query reads the Status Byte register, which contains the status summary
bits and the Output Queue MAV bit. Reading the Status Byte register does not
clear it. The input summary bits are cleared when the appropriate event
registers are read (see chapter “Programming the Status Registers” for more
information). A serial poll also returns the value of the Status Byte register,
except that bit 6 returns Request for Service (RQS) instead of Master Status
Summary (MSS). A serial poll clears RQS, but not MSS. When MSS is set, it
indicates that the electronic load has one or more reasons for requesting
service.
*TRG
This command generates a trigger to any system that has BUS selected as its
source (for example, TRIG:SOUR BUS). The command has the same affect as
the Group Execute Trigger (<GET>) command.
*TST?
This command causes the electronic load to do a self-test and report any error.
<NR1> 0 indicates the electronic load has
passed selftest.
Non-zero indicates an error code(see
appendix C）
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