Agilent Technologies B2200A User Manual page 182

Table 5-1
SCPI Command Reference
Status Byte Register
In general, use serial polling (not *STB?) inside interrupt service routines. Use
*STB? in other cases (not in interrupt service routine) when you want to know the
value of Status Byte.
Status Byte Register of B2200
Bit Definition
0 Not Used.
1 Not Used.
2 Not Used.
3 Not Used.
4 Message Available
(MAV) Queue Summary
Message
5 Standard Event Status
Bit (ESB) Summary
Message
6 Request Service (RQS)
Message
Master Summary Status
(MSS) Summary
Message
7 Not Used.
5-56
Explanation
Always zero.
Always zero.
Always zero.
Always zero.
Indicates whether Output Queue is empty. If
unread message exists, this bit is set to 1.
Otherwise, this bit is set to 0. See "Output
Queue" on page 5-60.
Indicates whether one or more of the enabled
Standard Events Status Register bits is set.
Indicates whether a SRQ (Service Request)
has occurred. Read by Serial Poll.
Indicates that the instrument has at least one
reason for requesting service. Read by
*STB?.
Always zero.
Agilent B2200 User's Guide, Edition 2