Telecommunications Techniques Corporation interceptor 147, Справочное руководство, Страница: 250 / 280

Remote Control Status Registers
C-6
C
INTERCEPTOR 147 2 Mbit/s and Data Analyzer
C.4 EVENT STATUS REGISTER GROUP
The Event Status Register group is used to detect specific
IEEE-488.2 defined events, and consists of two, 8-bit
registers: Event Status Register and Event Status Enable
Register. See Figure B-4.
Figure C-4
Event Status Register Group
The Event Status Register (ESR) assigns specific IEEE-
488.2 defined events to each of the bits within the register.
A bit is set in the Event Status Register when the event that
corresponds to that bit has occurred since the register was
last read or cleared. This register is cleared each time it is
read.
Bit 7 PON - Power On
Power has been cycled OFF and ON since
the last time the Event Status Register was
read.
Bit 6 URQ - User Request
Not used. Always reads 0.
EVENT STATUS REGISTER
(*ESR?)
EVENT STATUS ENABLE REGISTER
(*ESE?)
POWER ON
USER REQUEST
COMMAND ERROR
EXECUTION ERROR
DEVICE DEPENDENT ERROR
QUERY ERROR
REQUEST CONTROL
OPERATION COMPLETE
EVENT BIT
SUMMARY
STATUS BYTE REGISTER
(*STB?)