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1-56 Agilent B1500A/B1505A Programming Guide, Edition 11
Programming Basics
Status Byte
Status Byte
Status byte bits are turned off or on (0 or 1) to represent the instrument operation
status. When you execute a serial poll, an external computer (controller) reads the
contents of the status byte, and responds accordingly. When an unmasked status bit
is set to “1”, the instrument sends an SRQ to the controller, causing the controller to
perform an interrupt service routine.
Bit
Decimal
Value
Description
0 1 Data ready
Indicates whether the output buffer is empty. If an unread
data or query response exists, this bit is set to “1”. It is set
to “0” when all the stored data has been transferred to the
controller, or when the B1500 receives a *RST, BC, FMT,
or device clear command.
12Wait
Indicates whether the instrument is in the wait status. This
bit is set to “1” when the B1500 has been set to the wait
state by the PA, WS, PAX, or WSX command. It is set to
“0” when the waiting condition is complete, or when the
B1500 receives a *RST or device clear command.
2 4 Not applicable. This bit is always set to “0”.
3 8 Interlock open
If the interlock circuit is open, and a voltage output or
voltage compliance setup value exceeds the allowable
voltage for the interlock open condition, this bit is set to
“1” . It is set to “0” when the B1500 receives a serial poll,
*RST, or device clear command.
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