Racal Instruments 3151 User Manual page 89

3151 And 3151A User Manual
bits set in the register.
*IDN? - Query the generator s identity. The returned data is
organized into four fields, separated by commas. The generator
responds with its manufacturer and model number in the first two
fields, and may also report its serial number and options in fields
three and four. If the latter information is not available, the device
must return an ASCII 0 for each. For example, Model 3151/3151A s
response to *IDN? is:
RACAL INSTRUMENTS, 3151A,0,1.0.
*OPC - Set the "operation complete" bit (bit 0) in the Standard Event
register after the previous commands have been executed.
*OPC? - Returns "1" to the output buffer after all the previous
commands have been executed. *OPC? is used for synchronization
between a controller and the instrument using the MAV bit in the
Status Byte or a read of the Output Queue. The *OPC? query does
not affect the OPC Event bit in the Standard Event Status Register
(ESR). Reading the response to the *OPC? query has the advantage
of removing the complication of dealing with service requests and
multiple polls to the instrument. However, both the system bus and
the controller handshake are in a temporary hold-off state while the
controller is waiting to read the *OPC? query response.
*OPT? - Returns a "1" for 3151A and 3151 512K version, and 0 for
Model 3151/3151A with 64k memory.
*RST - Resets the generator to its default state. Default values are
listed in Table 4-1.
*SRE <enable_value> - Enables bits in the Status Byte enable
register.
*SRE? - Query the Status Byte enable register. The generator
returns a decimal value in the range of 0 to 63 or 128 to 191 since bit
6 (RSQ) cannot be set. The binary-weighted sum of the number
represents the value of the bits of the Service Request enable
register.
*STB? - Query the Status Byte summary register. The *STB?
command is similar to a serial poll but is processed like any other
instrument command. The *STB? command returns the same result
as a serial poll, but the "request service" bit (bit 6) is not cleared if a
serial poll has occurred.
*TRG - Triggers the generator from the remote interface. This
command effects the generator if it is first placed in the Trigger or
Burst mode of operation and the trigger source is set to "BUS".
*TST? - Implements an internal self-test and returns a value as
SCPI Command Reference 4-15