Programmable AC Source 6430/6420/6415 User‘s Manual
Bit configuration of Status Byte Register
Bit position 7 6 5 4 3 2 1 0
Condition OPER MSS ESB MAV QUES --- --- ---
RQS
Bit Weight 128 64 32 16 8
Remarks: RQS : Request service MSS : Master Summary Status
ESB : Event Status Bit MAV : Message Available
QUES : Questionable status OPER : Operation status
*SRE, Service Request Enable Command
Description: This command sets the content of the Service Request Enable Register, which
determines which events of the Status Byte Register are allowed to set the Master
Summary Status (MSS) and the Request Service (RQS) message true. If a bit is
1 in Service Request Enable Register and its associated event bit in Status Byte
Register transitions true, bit 6 of Status Byte Register is then set true.
Syntax: *SRE <NRf>
Parameters: 0 to 255
Example: *SRE 16 It enables the MAV bit event to set MSS and RQS bit.
Query Syntax: *SRE?
Return Parameters: <NR1>
Query Example: *SRE? It returns the content of Service Request Enable Register.
*STB?, Read Status Byte Query
Description: This query returns the Status Byte Register. The Status Byte Register can be
read with either a serial poll or the *STB? Common query. If it is read with a
serial poll, the RQS bit is sent for the position of bit 6 and then cleared. If it is
read with *STB?, MSS bit is sent but not cleared.
Query Syntax: *STB?
Parameters: None
Return Parameters: <NR1>
Query Example: *STB? It returns the content of Status Byte Register.
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