SCPI Register
Copyright © ITECH Electronic Co., Ltd. 15
Chapter2 SCPI Register
2.1 Status Register
You can use status register programming to determine the operating condition
of the electronic load at any time.For example, you may program the electronic
load to generate an interrupt (assert SRQ) when an event such as a current
protection occurs.
The Standard Event, Status Byte, Service Request Enable registers, and the
Output Queue perform standard GPIB functions as defined in the IEEE 488.2
Standard Digital Interface for Programmable Instrumentation. The Operation
Status and Questionable Status registers implement functions that are specific
to the electronic load.
The following table explains the status signals.
Calibrating: The electronic load iscalculated a new calibration constant.
Waiting: The electronic load is waiting for a trigger
Channel status group/Questionable status group
Voltage Fault. Either an overvoltage or a reverse voltage has occurred This bit reflects
the active state of the FLT pin on the back of the unit. The bit remains set until the
condition is removed and PROT:CLE is programmed.
Over current: An over-current condition hasoccurred. This occurs if the current exceeds
110% of the rated current or if it exceeds the user-programmed current protection level.
Removing the over-current condition clears the bit. If the condition persists beyond the
user programmable delay time, PS bit is also set and the input is turned off. Both bits
remain set until the condition is removed and PROT:CLE is programmed.
Remote Sense: When the real pannel sense is connected, this bit is true or else false.
Overpower: An overpower condition has occurred. This occurs if the unit exceeds the
max power or it excees the user-programmed power protection level, removing the
overpower condition clears the bit. If the condition persists beyond the user
programmable delay time, PS bit is also set and the input is turned off. Both bits remain
set until the condition is removed and PROT:CLE is programmed.
Over temperature: An over-temperature condition has occurred, both this bit and bit PS
are set and the input is turned off. Both bits remain set until the unit is cooled down and
PROT:CLE is programmed.
List run or stop status when list is runnig, this bit is true else false.
Extended Power Unavailable: This bit is not used.
Remote Reverse Voltage: A reverse voltage condition has occurred on the sense
terminals, both this bit and VF bit are set. Removing the reverse voltage clears this bit
but does not clear VF bit. VF Bit remains set until PROT:CLE is programmed.
Unregulated: The input is unregulated, when the input is regulated the bit is cleared.
Local Reverse Voltage: A reverse voltage condition has occurred on the input terminals,
both this bit and VF bit are set. Removing the reverse voltage clears this bit but does not
clear VF bit. VF bit remains set until PROT:CLE is programmed.
Over voltage: An over voltage condition has occurred, both this bit and VF bit0 are set
and the load are turned off. Both bits remain set until the condition is removed and
PROT:CLE is programmed.
Protection Shutdown: The protection shutdown circuit has tripped because of an
Over-current, over-power, or over-temperature condition. The bit remains set until
PROT:CLE is programmed.
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