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Lake Shore Model 325 Temperature Controller User’s Manual
6-6 Remote Operation
6.1.4.2 Status Register Sets
As shown in Figure 6-1, there are two register sets in the status system of the Model 325: Standard Event Status Register
and Operation Event Register.
6.1.4.2.1 Standard Event Status Register Set
The Standard Event Status Register reports the following interface related instrument events: power on detected,
command syntax errors, command execution errors, query errors, operation complete. Any or all of these events may be
reported in the standard event summary bit through the enable register, see Figure 6-2. The Standard Event Status Enable
command (*ESE) programs the enable register and the query command (*ESE?) reads it. *ESR? reads and clears the
Standard Event Status Register. The used bits of the Standard Event Register are described as follows:
Power On (PON), Bit (7) – This bit is set to indicate an instrument off-on transition.
Command Error (CME), Bit (5) – This bit is set if a command error has been detected since the last reading. This
means that the instrument could not interpret the command due to a syntax error, an unrecognized header,
unrecognized terminators, or an unsupported command.
Execution Error (EXE), Bit (4) – This bit is set if an execution error has been detected. This occurs when the
instrument is instructed to do something not within its capabilities.
Query Error (QYE), Bit (2) – This bit indicated a query error. It occurs rarely and involves loss of data because the
output queue is full.
Operation Complete (OPC), Bit (0) – When *OPC is sent, this bit will be set when the instrument has completed all
pending operations. The operation of this bit is not related to the *OPC? command, which is a separate interface
feature. Refer to Section 6.1.4.3.6 for more information.
Figure_6-2.bmp
Figure 6-2. Standard Event Status Register
6.1.4.2.2 Operation Event Register Set
The Operation Event Register reports the following interface related instrument events: ramp done, new reading,
overload. Any or all of these events may be reported in the operation event summary bit through the enable register,
see Figure 6-3. The Operation Event Enable command (OPSTE) programs the enable register and the query command
(OPSTE?) reads it. OPSTR? reads and clears the Operation Event Register. OPST? reads the Operation Condition
register. The used bits of the Operation Event Register are described as follows:
Processor Communication Error (COM), Bit (7) – This bit is set when the main processor cannot communicate with
the sensor input processor.
Calibration Error (CAL), Bit (6) – This bit is set if the instrument is not calibrated or the calibration data has been
corrupted.
New Sensor Reading (NRDG), Bit (4) – This bit is set when there is a new sensor reading.
Loop 1 Ramp Done (RAMP1), Bit (3) – This bit is set when a loop 1 setpoint ramp is completed.
Loop 2 Ramp Done (RAMP2), Bit (2) – This bit is set when a loop 2 setpoint ramp is completed.
Sensor Overload A (OVLD1), Bit (1) – This bit is set when the sensor A reading is in the overload condition.
Sensor Overload B (OVLD2), Bit (0) – This bit is set when the sensor B reading is in the overload condition.