The Status Byte - Agilent Technologies 34420A User Manual

Chapter 4 Remote Interface Reference
The SCPI Status Model

The Status Byte

The status byte summary register reports conditions from other status
registers. Query data that is waiting in the meter's output buffer is
immediately reported through the "message available" bit (bit 4). Bits in
the summary registers are not latched. Clearing an event register will
clear the corresponding bits in the status byte summary register. Reading
all messages in the output buffer, including any pending queries, will
clear the message available bit.
Bit Definitions — Status Byte Register
Bit
0 Not Used
1 Not Used
2 Not Used
3 Questionable Data
4 Message Available
5 Standard Event
6 Request Service
7 Operational Status
Decimal
Value
1 Always set to 0
2 Always set to 0
4 Always set to 0
8 One or more bits are set in the Questionable
Data register (bits must be "enabled" in the
enable register).
16 Data is available in the meter output buffer
32 One or more bits are set in the Standard
Event register (bits must be "enabled" in the
enable register).
64 The meter is requesting service (serial poll).
128 One or more bits are set in the Operational
Event register (bits must be "enabled" in the
enable register)
Definition
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