1257 User Manual
EADS North America Defense
SCPI Command Basics 5-9
Test and Services, Inc.
©
2001
Standard EVENT
STATUS Register
Figure 5-1
shows four related registers. The
Standard Event
Status Register
, the
Standard Event Status Enable Register
, the
Status Byte Register
, and the
Service Request Enable Register
.
The
Standard Event Status Register
reflects the present status of
the instrument. This register consists of eight 1-bit flags. Each flag
represents a true or false indication of the corresponding condition.
The bits of this register are:
PON
Power-On
Bit 7 (MSB), Bit weight = 128 decimal = 80
hexadecimal
This flag is set when the instrument is powered on.
URQ
User
Request
Bit 6, Bit weight = 64 decimal = 40 hexadecimal
This bit is never set by the 1257 and will always
read 0.
CME
Command
Error
Bit 5, Bit weight = 32 decimal = 20 hexadecimal
This bit is set when a command error is detected by
the 1257.
Errors of this type will also result with an error
added to the error queue. The error may be read
using the SYST:ERR? query to determine the cause
of the error
EXE
Execution
Error
Bit 4, Bit weight = 16 decimal = 10 hexadecimal
This bit is set when a valid command is received but
cannot be executed for some reason. For example,
an error occurs while executing the *SAV command.
When this error occurs, an error message is added
to the message queue and may be read using the
SYST:ERR? query.
DDE Device Dependent Error
Bit 3, Bit weight = 8 decimal = 8 hexadecimal