Agilent Technologies B2201A manual Status Byte Register of B2200 Bit Definition Explanation

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.

Table 5-1	Status Byte Register of B2200
	Bit	Definition	Explanation
	0	Not Used.	Always zero.
	1	Not Used.	Always zero.
	2	Not Used.	Always zero.
	3	Not Used.	Always zero.
	4	Message Available	Indicates whether Output Queue is empty. If
		(MAV) Queue Summary	unread message exists, this bit is set to 1.
		Message	Otherwise, this bit is set to 0. See “Output
			Queue” on page 5-60.
	5	Standard Event Status	Indicates whether one or more of the enabled
		Bit (ESB) Summary	Standard Events Status Register bits is set.
		Message
	6	Request Service (RQS)	Indicates whether a SRQ (Service Request)
		Message	has occurred. Read by Serial Poll.
		Master Summary Status	Indicates that the instrument has at least one
		(MSS) Summary	reason for requesting service. Read by
		Message	*STB?.
	7	Not Used.	Always zero.

5-56 Agilent B2200 User’s Guide, Edition 2