Standard Event Status Register - Racal Instruments 1256 Manual

Publication No. 980855 Rev. A
Standard EVENT
STATUS Register
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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 1256 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 1256.
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.
1256 User Manual
SCPI Command Basics 5-9