Lakeshore 340 User Manual page 122

Operation Complete Command
QOPC
Input: *OPC
Returned: Nothing
Remarks: Generates an Operation Complete event in the Standard Event Status Register upon
completion of all pending selected device operations.
Query Operation Complete
QOPC?
Input: *OPC?
Returned: 1. Format: n[term]
Remarks: Places a "1" in the controller output queue upon completion of all pending selected device
operations. Send this as the last command in a command string. This is not the same
function as the *OPC command.
Reset Instrument
QRST
Input: *RST
Returned: Nothing
Remarks: Sets controller parameters to power-up settings.
Configure Status Reports in the Service Request Enable Register
QSRE
Input: *SRE <bit weighting>
Returned: Nothing
Remarks: Each bit has a bit weighting and represents the enable/disable status of the corresponding
status flag bit in the Status Byte Register. To enable a status flag bit, send the command
*SRE with the sum of the bit weighting for each desired bit. See the *STB? command for a
list of status flags.
Example: To enable status flags 0, 3, 4, and 6, send the command *SRE 89[term]. 89 is the sum of the
bit weighting for each bit.
Query the Configuration of Status Reports in the Service Request Enable Register
QSRE?
Input: *SRE?
Returned: <SRE bit weighting>. Format: nnn[term]
Remarks: The integer returned represents the sum of the bit weighting of the enabled bits in the Service
Request Enable Register. See the *STB? command for a list of status flags.
QSTB?
Input:
Returned:
Remarks:
9-24
Lake Shore Model 340 Temperature Controller User's Manual
Bit Bit Weighting
0 1
3 8
4 16
6 64
89
Query Status Byte
*STB?
<STB bit weighting>. Format: nnn[term]
Acts like a serial poll, but does not reset the register to all zeros. The integer returned
represents the sum of the bit weighting of the status flag bits that are set in the Status
Byte Register.
Bit Bit Weighting
0 1
1 2
2 4
3 8
4 16
5 32
6 64
7 128
Event Name
New A&B
Alarm
Error
SRQ
Event Name
New A&B
New Option
Settle
Alarm
Error
ESB
SRQ
Ramp Done
Remote Operation