Cryo-con Model 24C
Remote Programming Guide
The Status Byte
The Status Byte (STB) is defined by the SCPI and is used to collect individual status
bits from the ESE and the ISR as well as to identify that the instrument has a
message for the host in it’s output queue. It is queried using the Common Command
*STB?. Bits are defined as follows:
STB
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
RQS
SE
MAV
IE
Where:
Bit6 – RQS:
Request for Service.
Bit5 – SE:
Standard Event. This bit is set as the logical ‘AND’ of the ESR and
ESE registers.
Bit4 – MAV:
Message Available
Bit3 – IE:
Instrument Event. This bit is set as the logical ‘AND’ of the ISR and
ISE registers.
The Status Byte Register
The Status Enable Register (SRE) is defined by the mask register for the STB. It is
set and queried using the Common Commands *SRE.
The logical ‘AND’ of the SRE and STB registers is used to generate a service request
on the GPIB interface.
114
