Status Byte (Sb); Service Request Enable (Sre); Standard Event Status (Esr) - Stanford Research Systems SIM983 Operation And Service Manual

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3.5.1 Status Byte (SB)

3.5.2 Service Request Enable (SRE)

3.5.3 Standard Event Status (ESR)

At power-on, all status registers are cleared.
The Status Byte is the top-level summary of the SIM983 status model.
When masked by the Service Request Enable register, a bit set in the
Status Byte causes the STATUS signal to be asserted on the rear-
panel SIM interface connector.
Weight Bit Flag
1 0 OLSB
2 1 undef (0)
4 2 undef (0)
8 3 undef (0)
16 4 IDLE
32 5 ESB
64 6 MSS
128 7 CESB
OLSB : Overload Summary Bit. Indicates whether one or more of the
enabled flags in the Overload Status Register has become true.
IDLE : Indicates that the input bu er is empty and the command
parser is idle. Can be used to help synchronize SIM983 query
responses.
ESB : Event Status Bit. Indicates whether one or more of the enabled
events in the Standard Event Status Register is true.
MSS : Master Summary Status. Indicates whether one or more of the
enabled status messages in the Status Byte register is true.
CESB : Communication Error Summary Bit. Indicates whether one or
more of the enabled flags in the Communication Error Status
Register has become true.
Each bit in the SRE corresponds one-to-one with a bit in the SB regis-
ter, and acts as a bitwise AND of the SB flags to generate MSS. Bit 6 of
the SRE is undefined—setting it has no e ect, and reading it always
returns 0. This register is set and queried with the *SRE(?) command.
At power-on, this register is cleared.
The Standard Event Status Register consists of 8 event flags. These
event flags are all "sticky bits" that are set by the corresponding
events, and cleared only by reading or with the *CLS command.
Reading a single bit (with the *ESR? i query) clears only Bit i.
Remote Operation
SIM983 Scaling Amplifier