7.3-4 Calibrator Status
Status registers, enable registers, and queues provide status information on
the calibrator. Each status register and queue has a summary bit in the
Serial Poll Status Byte. Enable registers generate summary bits in the Serial
Poll Status Byte. The following is a list of registers and queues along with
their function.
Serial Poll Status Byte (STB)
The STB is sent when the calibrator responds to the *STB? command.
Figure 24 demonstrates how it functions. Cleared when power is reset.
Service Request Enable Register (SRE)
Enables or disables the bits of the STB. Cleared when power is reset.
Setting bits to 0 disables them in the STB. Setting the bits to 1 enables
them. Bit assignments for the SRE and the STB are shown below.
7 6543210
0 MSS ESB 0 EAV 0 0 0
MSS
Master Summary Status. Set to 1 when ESB or EAV are 1
(enabled). Read using the *STB? command.
ESB
Set to 1 when at least one bit in ESR is 1.
EAV
Error Available. An error has been entered into the error queue,
and may be read using the Fault? command.
Event Status Register (ESR)
A two-byte register, in which the lower bits represent conditions of the
Calibrator. Cleared when read and when power is reset.
Event Status Enable Register (ESE)
Enables and disables bits in the ESR. Setting a bit to 1 enables the
corresponding bit in the ESR, and setting it to 0 disables the corresponding
bit. Cleared at power reset. Bit assignments for the ESR and the ESE
respectively are shown below.
31
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