Last updated: January 16, 2009
The *CLS, clear status command, is defined in "IEEE Std 488.2-1992", 10.3. If an error message is currently posted on the test set's display, this command also closes the error message.
The *IDN?, identification query, is defined in "IEEE Std 488.2-1992", 10.14.*IDN? is used to retrieve information about the test set in ASCII format.
*IDN?, returns ASCII codes 32 through 126 excluding comma and semicolon in four comma separated fields. Field 1 returns the manufacturer, field 2 returns the instrument model number, field 3 returns the serial number, field 4 returns 0.
The *OPC, operation complete command, is defined in "IEEE 488.2-1992", 10.18. *OPC causes the test set to continuously sense the No Operation Pending flag. When the No Operation Pending flag becomes TRUE, the OPC event bit in the standard event status register (ESR) is set to indicate that the state of all pending operations is completed. The *OPC common command is not recommended for use as an overlapped command.
The *OPC?, operation complete query, is defined in "IEEE Std 488.2-1992", 10.19. The *OPC? query allows synchronization between the controller and the test set using either the message available (MAV) bit in the status byte, or a read of the output OPC?. The *OPC? query does not effect the OPC event bit in the Standard Event Status Register (ESR). The *OPC? common command is not recommended for use as an overlapped command.
The *OPT?, option identification query, is defined in "IEEE Std 488.2-1992", 10.20. Each option will have a unique name, that name will be retuned with the query.
The *RST, full preset command, is defined in "IEEE Std 488.2-1992", 10.32. *RST is the recommended command when performing a full preset on the test set. A *RST restores the majority of settings to their default values.
The *SRE, service request enable command, is defined in "IEEE Std 488.2-1992", 10.34. The parameter range for this command is 0 through 255.
The *SRE?, service request enable query, is defined in "IEEE Std 488.2-1992", 10.35. Values returned by this query range from 0 through 255.
The *STB?, read status byte query, is defined in "IEEE Std 488.2-1992", 10.36. Values returned by this query range from 0 through 255.
The test set's implementation of *TST? does not follow the "IEEE Std 488.2-1992" section 10.38 definition. Rather, the test set's implementation is as described in the "Verifying the Test Set" (Self Test) topic in the Related Topics below. Values returned by this query are 0 (pass) and -330 (fail).