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User Manual 3155

Programming Reference 4-65

IEEE-STD-488.2

Common Com-

mands and Que-

ries

Since most instruments and devices in an ATE system use similar

commands that perform similar functions, the IEEE-STD-488.2

document has specified a common set of commands and queries

that all compatible devices must use. This avoids situations where

devices from various manufacturers use different sets of commands

to enable functions and report status. The IEEE-STD-488.2 treats

common commands and queries as device dependent commands.

For example, *TRG is sent over the bus to trigger the instrument.

Some common commands and queries are optional, but most of

them are mandatory.

The following is a complete listing of all common-commands and

queries, which are used by the 3155

*CLS - Clear the Status Byte summary register and all event registers.

*ESE <enable_value> - Enable bits in the Standard Event enable reg-

ister. The selected bits are then reported to the status byte.

*ESE? - Query the Standard Event enable register. The generator re-

turns a decimal value, which corresponds to the binary-weighted sum of

all bits, set in the register.

*ESR? - Query the Standard Event register. The generator returns a

decimal value, which corresponds to the binary-weighted sum of all 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 re-

port 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 3155 response to *IDN? is:

Racal Instruments,3155,0,1.0

*OPC - Set the "operation complete" bit (bit 0) in the Standard Event

*OPC? - Returns "1" to the output buffer after all the previous com-

mands have been executed. *OPC? is used for synchronization be-

tween 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). Read-

ing 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 hand-

shake are in a temporary hold-off state while the controller is waiting to

read the *OPC? query response.

*OPT? - Returns the value “0” for a 3155 with no options.

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