Keithley 7999-6, Instruction Manual

Page: 49 / 89

3-22 Operation
*OPC — operation complete
Sets OPC bit
*OPC? — operation complete query
Places a “1” in output queue
When *OPC is sent, the OPC bit in the standard event register will set after all pending com-
mand operations are complete. When *OPC? is sent, an ASCII “1” is placed in the output
queue after all pending command operations are complete.
The following syntax rules explain how to use *OPC and *OPC? with other commands:
NOTE
Send *OPC or *OPC?, separated by a semicolon, on the same line as another query.
If sent on separate lines, an error occurs. The *OPC? can be sent on the same line
with a command that is not a query, or on a separate line as a command (not a
query).
*RST — reset
Return relay unit to *RST defaults
When the *RST command is sent, the relay unit performs the following operations:
1. Returns the instrument to the RST default conditions (see “Default” column of SCPI
tables) and opens all relay paths.
2. Cancels all pending commands.
3. Cancels response to any previously received *OPC and *OPC? commands.
*SRE <NRf> — Service Request Enable
Program register
*SRE? — Service Request Enable Query
Read register
Parameter <NRf> = 0 Clears enable register
4 Set EAV bit (Bit 2)
16 Set MAV bit (Bit 4)
32 Set ESB (Bit 5)
255 Set all bits
Use the *SRE command to program the Service Request Enable Register. Send this com-
mand with the decimal equivalent of the binary value that determines the desired state (0 or 1)
of each bit in the register. This register is cleared on power-up.
This enable register is used along with the Status Byte Register to generate service requests
(SRQ). With a bit in the Service Request Enable Register set, an SRQ occurs when the corre-
sponding bit in the Status Byte Register is set by an appropriate event. For more information on
register structure, see the information presented earlier in this section.
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