Cryo-con Model 24C Remote Programming Guide
SCPI Status Registers
The Instrument Status Register
The Instrument Status Register (ISR) is queried using the SYSTEM:ISR? command.
The ISR is commonly used to generate a service request (GPIB) when various status
conditions occur. In this case, the ISR is masked with the Instrument Status Enable
(ISE) register.
The ISR is defined as follows:
ISR
Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Alarm Htr SFB SFA
Where:
Bit7 – Alarm: Indicates that an alarm condition is asserted. Use the ALARM
commands to query individual alarms.
Bit4 – Htr: Indicates a heater fault condition. Use the HEATER
commands to query the heater.
Bit1 to Bit0 – SFx: Indicates that a sensor fault condition is asserted
on an input channel. Use the INPUT commands to query the input
channels.
The Instrument Status Enable Register
The Instrument Status Enable (ISE) Register is a mask register. It is logically anded"
with the contents of the ISR in order to set the Instrument Event (IE) bit in the Status
Byte (STB) register. This can cause a service request (GPIB) to occur.
Bits in the ISE correspond to the bits in the ISR defined above.
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