Agilent Technologies N1913a User Manual page 230

9 Maintenance
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Framing error in program
The serial port receiver has detected a framing error and consequently, data integrity
cannot be guaranteed.
Input buffer overrun
The serial port receiver has been overrun and consequently, data has been lost.
Query INTERRUPTED
A command was received which sends data to the output buffer, but the output buffer
contained data from a previous command (the previous data is not overwritten). The
output buffer is cleared when power has been off, or after *RST (reset) command has
been executed.
Query UNTERMINATED
The power meter was addressed to talk (that is, to send data over the interface) but a
command has not been received which sends data to the output buffer. For example you
may have executed a CONFigure command (which does not generate data) and then
attempted to read data from the remote interface.
Query DEADLOCKED
A command was received which generates too much data to fit in the output buffer and
the input buffer is also full. Command execution continues but data is lost.
Query UNTERMINATED after indefinite response
The *IDN? command must be the last query command within a command string.
Agilent N1913A/1914A EPM Series Power Meters User's Guide