Chapter Seven: IEEE-488 Communications Option
Status Information
107
Status Byte Register
The Status Byte register contains information on the status of the 670 instrument. Bits 6, 5, and
4 are defined by IEEE-488.2. The information is useful to check the status of the instrument. To
read the Status Byte register, issue the “*STB?” command. Refer to Table 29 for a description of
this register.
Status Byte Register
Bit Number
Function
B7
Not Used*
B6
Master Summary Status bit.
Set when service requested
B5
Set if Event Status Bit is set. Read Standard Event
Status Register for status.
B4
Message available/Output Queue Not Empty
B3
Not Used*
B2
Not Used*
B1
Not Used*
B0
Not Used*
*Will read as 0
Table 29: Status Byte Register
Read Status Byte Register Query (*STB?)
This command queries the status of the Status Byte register and the Master Summary Status bit
(bit 6). The value of this register is placed in the output queue of the 670 instrument.
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