Technical data

6 IEEE-488.2 Common Commands
44 U2751A Programmer’s Reference Guide
*STB?
Syntax
*STB?
Queries the condition register for the Status Byte register group. The bits
are not cleared when you read the register.
Remarks
• The following table lists the bit definitions for the Status Byte register.
• The Status Byte condition register is cleared when you execute the
clear status (*CLS) command. Clearing an event register will clear the
corresponding bits in the Status Byte summary register (bit 5).
• The Status Byte Enable register is cleared when you execute the
*SRE 0 command.
Bit number Decimal value Definition
0 Not Used 1 Always zero.
1 Not Used 2 Always zero.
2 Error Queue 4 There is at least one error code in the error queue. Use the
SYSTem:ERRor? command to read and clear the error from the
queue.
3 Not Used 8 Always zero.
4 Message Available 16 Data is available in the instrument's output buffer.
5 Standard Event 32 One or more bits are set in the Standard Event register (bits
must be enabled, refer to the *ESE command).
6 Master Summary 64 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 Not Used 128 Always zero.