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525A
Users Manual
Service Request Enable Register (SRE)
The Service Request Enable Register (SRE) enables or masks the bits of the Serial
Poll Status Byte. The SRE is cleared at power up. Refer to Figure 4-6 for the bit
functions.
Programming the STB and SRE
By resetting (to 0) the bits in the SRE, you can mask (disable) associated bits in
the serial poll status byte. Bits set to 1 enable the associated bit in the serial poll
status byte.
Event Status Register (ESR)
The Event Status Register is a two-byte register in which the higher eight bits are
always 0, and the lower eight bits represent various conditions of the Calibrator.
The ESR is cleared (set to 0) when the power is turned on, and every time it is
read.
Many of the remote commands require parameters. Improper use of parameters
causes command errors to occur. When a command error occurs, bit CME (5) in
the Event Status Register (ESR) goes to 1 (if enabled in ESE register), and the
error is logged in the error queue.
Event Status Enable (ESE) Register
A mask register called the Event Status Enable register (ESE) allows the controller
to enable or mask (disable) each bit in the ESR. When a bit in the ESE is 1, the
corresponding bit in the ESR is enabled. When any enabled bit in the ESR is 1, the
ESB bit in the Serial Poll Status Byte also goes to 1. The ESR bit stays 1 until the
controller reads the ESR or does a device clear, a selected device clear, or sends
the reset or *CLS command to the Calibrator. The ESE is cleared (set to 0) when
the power is turned on.
4-26
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