The slowest participating device determines the speed of the bus. For octal, the letter ” Q ” was chosen instead of the letter ” O ” to minimize the visual confusion with the number ” 0 ” zero. The bus line monitoring capability of an IEEE Because of these IEEE This page was last edited on 26 July , at Technical and de facto standards for wired computer buses. SCPI commands to an instrument may either perform a set operation e.

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Some commands can be used for both setting and querying an instrument. Similar to a Serial Poll, but processed like any other instrument command. For octal, the letter ” Q ” was chosen instead of the letter ” O ” to minimize the visual confusion with the number ” 0 ” zero.

Enables 1 or disables 0 eiee clearing of certain enable registers at power on:.

IEEE 488.2 Standard & Commands

You prioritize the input list of devices so that the more critical devices receive service first. A device-specific error, including a self-test error or calibration error, occurred an error in the range or any positive error has been generated.

Because these operations are common to all instruments, 48.2 L3 – Listen only mode; unlistens if talk address received L4 – Unlistens if talk address received. Abbreviating the command to only sending the upper case has the same meaning as sending the upper and lower case command.


Interfaces are listed by their speed in the roughly ascending order, so the interface at the end of each section should be the fastest. Return the instrument’s identification string: If any of the selected bits change from 0 to 1, the instrument generates a Service Request signal.

IEEE – Wikipedia

Event Status Enable Command and Query. Parameter Typical Return none none Return five DC voltage measurements, using a software trigger to start the measurements: More information see Tektronix.

Parameter Typical Return Decimal sum of the bits in the register, default 0. They are sometimes called “Centronics connectors” after the pin micro ribbon connector Centronics used for their printers.

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Commands are a series of one or more keywords, many of which take parameters. Read Status Byte Query.

Very High Performance IEEE-488.2Interface Card for ISA Bus

A condition register continuously monitors the state of the instrument. Disable power-on clearing of affected registers: The status reporting model is shown in Figure 1. Return the learn string: Since each device generated the asynchronous handshaking signals required by the bus protocol, slow and fast devices could be mixed on one bus.


The physical hardware communications link is not defined by SCPI. Decimal sum of the bits in the register, ieee 0.

But when HP’s early microcomputers needed an interface for peripherals disk drivestape drivesprintersplottersetc. You obtain the true benefits of IEEE For example, all SCPI-compatible voltmeters, regardless of manufacturer or model, respond to the same command for reading AC voltage.

As GPIB became popular, iee was formalized by various standards organizations. It uses the IEEE There was no requirement for galvanic isolation between the bus and devices, which created the possibility of ground loops causing extra noise and loss of data.

The selected bits are then reported to bit 5 of the Status Byte Register. The overriding concept used in the IEEE