Power Meter Remote Operation 1
N1911A/1912A P-Series Power Meters Programming Guide 59
The Status Byte Summary Register
The status byte summary register reports conditions from other status
registers. Query data waiting in the power meter’s output buffer is
immediately reported through the “message available” bit (bit 4). Clearing
an event register clears the corresponding bits in the status byte summary
register. Reading all messages in the output buffer, including any pending
queries, clears the message available bit.
Tab le 1-5 Bit Definitions - Status Byte Register
Particular bits in the status byte register are cleared when:
• The standard event, Questionable status, operation status and device
status are queried.
• The error/event queue becomes empty.
• The output queue becomes empty.
Bit Number Decimal
Weight
Definition
0 1 Not Used (Always set to 0)
1 2 Device Status Register summary bit.
One or more bits are set in the Device Status Register (bits
must be “enabled” in enable register)
2 4 Error/Event Queue
3 8 Questionable Status Register summary bit.
One or more bits are set in the Questionable Status Register
(bits must be “enabled” in enable register).
4 16 Data Available
Data is available in the power meter’s output buffer.
5 32 Standard Event
One or more bits are set in the Standard Event register (bits
must be “enabled” in enable register).
6 64 Request Service
The power meter is requesting service (serial poll).
7 128 Operation Status Register summary bit.
One or more bits are set in the Operation Status Register (bits
must be “enabled” in enable register).
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