*STB?
*STB?
Syntax
*STB?
Description
This command queries the condition register for the Status Byte Register group. This is a read-only register and the bits are not cleared when you read the register.
For more information on the Status System for the instrument, see Status System Introduction.
Remarks
- The following table lists the bit definitions for the Status Byte Register.
Bit # Bit Name Decimal Value Definition 0 Not Used 1 Always zero. 1 Alarm Summary 2 One or more bits are set in the Alarm Register (bits must be enabled). 2 Error Queue 4 One or more errors have been stored in the Error Queue. Use the SYSTem:ERRor? query to read and delete errors. 3 Questionable Data Summary 8 One or more bits are set in the Questionable Data Register (bits must be enabled, see STATus:QUEStionable:ENABle command). 4 Message Available 16 Data is available in the instrument's output buffer. 5 Standard Event Summary 32 One or more bits are set in the Standard Event Register (bits must be enabled, see *ESE command). 6 Master Summary X One or more bits are set in the Status Byte Register and may generate a Request for Service (RQS). Bits must be enabled using the *SRE command. 7 Standard Operation Summary 128 One or more bits are set in the Standard Operation Register (bits must be enabled, see STATus:OPERation:ENABle command).
- This query returns the same results as a Serial Poll but the "Master Summary" bit (bit 6) is not cleared if a Serial Poll has occurred.
- Unlike how a reset clears the condition register, a factory reset (*RST command) does not clear the Status Byte Register.
Return Format
The query reads the condition register and returns a decimal value that corresponds to the binary-weighted sum of all bits set in the register (see table above). For example, if bit 3 (decimal value = 8) and bit 5 (decimal value = 32) are set (and the corresponding bits are enabled), this command will return "+40".
Example
The following query reads the condition register (bits 3 and 5 are set).
*STB?
Typical Response: +40