Reading Registers; Status Byte And Service Request (Srq) - Keithley SourceMeter 2790 Reference Manual

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Reading registers

Any register in the status structure can be read by using the appropriate query (?) com-

mand. The following explains how to interpret the returned value (response message). The

actual query commands are covered later in this section

The response message for a register query will be a decimal value. This decimal value will

have to be converted to its binary equivalent. For example, decimal 19 in binary is 10011.

This binary value indicates that bits B0, B1, and B4 are set (1).

Service request is controlled by two 8-bit registers: the Status Byte Register and the Ser-

vice Request Enable Register.

Status byte and service request (SRQ)

OSB = Operation Summary Bit

MSS = Master Summary Status

RQS = Request for Service

ESB = Event Summary Bit

MAV = Message Available

Model 2790 SourceMeter

shows the structure of these registers.

Status Summary Message

QSB = Questionable Summary Bit

EAV = Error Available

MSB = Measurement Summary Bit

& = Logical AND

OR = Logical OR

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Read by Serial Poll

Read by *STB?

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