Technical data

• *STB?
If the register is read using the common command *STB? , bit 6 is referred to
as the master summary bit or MSS bit. This bit indicates that the instrument
has requested service. The MSS bit is not cleared when the register is read
using the *STB? command. It always reflects the current status of all the
instrument's status registers.
Standard Event Status Register
The Standard Event Status register is a 16-bit register group that gives general-
purpose information about the instrument. It sets bit 5 in the Status Byte.
Table 2
Bit Mnemonic Description
0 OPC Operation Complete bit. It
is set in response to the
*OPC command, but only if
the instrument has
completed all its pending
operations.
1 Not used
2 QYE Query error bit. It indicates
that there is a problem
with the output data
queue. There has been an
attempt to read the queue
when it is empty, the
output data has been lost,
or the query command has
been interrupted.
3 DDE Device-dependent error
bit. It is set when an
instrument-specific error
has occurred.
Recommended Programming Techniques 3
Agilent J-BERT N4903B High-Performance Serial BERT 29