HP E8402A, User And Service Manual, Page: 173 / 249

Programming the Enhanced Monitor 175
Chapter 3
*ESR?
*ESR? query returns the value of the event register for the Standard Event status
group.
The standard event status group provides the status of common instrument events
including synchronization (Operation Complete) and Errors (Parser, Execution,
Command Errors, and Instrument Dependent).
The event register latches transition events from the condition register as specified
by the transition filter. Only the positive transition filter is active in the module, this
means that a transition event will occur when a condition makes a transition from a
low to a high state. Bits in the event register are latched, and once set, they remain
set until cleared by a *ESR? query or *CLS (clear status). There is no buffering; so
while an event bit is set, subsequent events corresponding to that bit are ignored.
Event registers are read only.
The following table describes each bit in the Standard Event status group:
Returned Data
Reset Condition
*RST does not affect the status system. Use *CLS to clear all event registers in the
status system.
Related
Commands
STATus:OPERation:EVENt?, STATus:QUEStionable:EVENt?
Bit Description Decimal Value
0 Operation Complete (OPC) 1
1 Request Control (RQC) 2
2 Query Error (QYE) 4
3 Instrument Dependent (DDE) 8
4 Execution Error (EXE) 16
5 Command Error (CME) 32
6 User Request (URQ) 64
7 Power On (PON) 128
Type Range Default Description
int16 0 - 255 none Bit mask indicating which enable bits are set (1) or cleared (0)
for the Standard Event status group.