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TTI-7 Iss.02 – 06/11
Only a few status bits are used in the instrument, and this reporting system may look a little unwieldy at first.
However, it follows the style of SCPI and the unused bits are allocated to other functions which allow for expansion
and compatibility with other SCPI compliant devices.
Questionable Data Registers
Temperature Range (bit 4)
This bit is set when the last measurement resulted in a computed temperature that was outside the measuring range
of the instrument. It is also set when the “crossed wires” condition is detected.
The following commands are used to access these registers:
STATus:QUEStionable:CONDition?
Queries the Questionable Data Condition Register. The instrument returns a binary-weighted decimal value
representing the bits set in the condition register.
STATus:QUEStionable:EVENt?
Queries the Questionable Data Event Register. The instrument returns a binary-weighted decimal value representing
the bits set in the event register.
STATus:QUEStionable:ENABle <enable value>
Enables bits in the Questionable Data Enable Register. The selected bits are then reported to the Status Byte.
STATus:QUEStionable:ENABle?
Queries the Questionable Data Enable Register. The instrument returns a binary-weighted decimal value
representing the bits set in the enable register.
Standard Event Registers
Operation Complete (bit 0)
This bit is set in response to the *OPC command. It indicates that the instrument has completed all pending
operations.
Query Error (bit 2)
This bit is set when either an attempt has been made to read data from the output queue when no data is present or
pending, or data in the queue has been lost.
Execution Error (bit 4)
This bit is set when a valid command has been received and recognised, but could not be executed at the time. This
could be either an out-of-context command or an out of range parameter. The command is ignored.
Command Error (bit 5)
This bit is set when the command line is not recognised by the parser. This could be an invalid command, parameter
or syntax. The command is ignored.
Power On (bit 7)
Indicates that an off-on transition has occurred in the instrument’s power supply.
The following commands are used to access these registers:
*ESR?
Queries the Standard Event Register. The instrument returns a decimal value which corresponds to the binary-
weighted sum of all bits set in the register.
