4 Remote Interface Reference
178 Keysight 34420A User’s Guide
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 Decimal Value Definition
0 Not Used 1 Always set to 0
1 Not Used 2 Always set to 0
2 Not Used 4 Always set to 0
3 Questionable Data 8
One or more bits are set in the Questionable Data
register (bits must be "enabled" in the enable register).
4 Message Available 16 Data is available in the meter output buffer.
5 Standard Event 32
One or more bits are set in the Standard Event register
(bits must be "enabled" in the enable register).
6 Request Service 64 The meter is requesting service (serial poll).
7 Operational Status 128
One or more bits are set in the Operational Event
register (bits must be "enabled" in the enable register).
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