F.W. Bell 8000 series, Инструкция по эксплуатации

Страница: 92 / 132

F.W. BELL 8000 Series Gauss/Tesla Meter Instruction Manual
Section 8 – Remote Operation 8-13
Status Registers and Error Queue
Status
Registers
There are four register sets that indicate the status of the instrument, such as
errors or the present state of the machine. These are 16-bit registers, but in
many cases not all of the bits are used. The four register sets are called:
MEASUREMENT EVENT OPERATION EVENT
STANDARD EVENT QUESTIONABLE EVENT
There is also an 8-bit register that provides a 1-bit summary for each of the
four register sets. This is called the STATUS BYTE.
Each register set consists of three individual registers, as shown below.
Figure 8-9 Condition, Event, and Enable Registers
The CONDITION register is a real time, read-only register that is constantly
updated to reflect current operating conditions.
The EVENT register is fed by the CONDITION register, but operates as a
latch. Whenever any bit in the CONDITION register goes to “1”, a
corresponding “1” is latched into the EVENT register and remains that way
until cleared by a specific command.
The ENABLE register is a mask register that is used to generate the single
status bit in the STATUS BYTE. Setting any bit in the ENABLE register to “1”
will allow a corresponding “1” in the EVENT register to set the summary bit in
the STATUS BYTE.
An example of their usage appears at the end of this section.