Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 147)

8P. Command Descriptions II. SOFTWARE GUIDES - 8. Driver488/DRV
II-132 Personal488 User’s Manual, Rev. 3.0
Bus Commands
•
Device Clear ( DCL ): This UCG command causes all bus devices to be initialized to a pre-defined or
power-up state.
•
Group Execute Trigger ( GET ): This ACG command usually signals all bus devices to begin
executing a triggered action. This allows actions of different devices to begin simultaneously.
•
Go To Local ( GTL ): This ACG command allows the selected devices to be manually controlled.
•
Local Lock Out ( LLO ): This UCG command prevents manual control of the instrument’s functions.
•
My Listen Address ( MLA ): This command addresses a device to Listen. The device accepts data
from the Active Talker and outputs this data through the serial interface. It substitutes the selected
serial terminators for the received IEEE 488 bus terminators.
•
My Talk Address ( MTA ): This command addresses a device to Talk. The device retrieves data
from the serial input buffer and outputs it to the IEEE 488 bus. It substitutes the selected IEEE
488 bus terminators for the received serial terminators. The device will continue to output serial
input buffer data as long as the IEEE 488 controller allows.
•
Parallel Poll Configure ( PPC ): This command configures devices capable of performing a
Parallel Poll via the data bit they are to assert in response to a Parallel Poll.
•
Parallel Poll Disable ( PPD ): This ACG command disables the Parallel Poll response of selected
devices.
•
Parallel Poll Unconfigure ( PPU ): This UCG command disables all devices from responding to a
Parallel Poll.
•
Selected Device Clear ( SDC ): This ACG command causes a single device to be initialized to pre-
defined or power-up state.
•
Serial Poll Disable ( SPD ): This UCG command disables a device from sending its Serial Poll status
byte.
•
Serial Poll Enable ( SPE ): This UCG command, when ATN is unasserted, will cause a device that is
addressed to talk, to output its Serial Poll status byte.
•
Take Control ( TCT ): This ACG command passes bus control responsibilities from the current
Controller to another device which has the ability to control.
•
Unlisten ( UNL ): This LAG command places the device in the Listen Idle state.
•
Untalk ( UNT ): This TAG command places the device in the Talk Idle state.
For more detailed information, many of these commands appear in Chapter 15 “Command References”
of “Section III: Command References” in this manual. Also, for information on the relationship
between bus messages and ASCII character codes, turn to “Section V: Appendix” in this manual.
Examples
The Examples section of the command description format lists one or more short examples of the
command’s normal use. These and additional programs can be found in language or example
subdirectories of the Driver488/DRV installation directory.
Data Types
For information on the Driver488/DRV data bit masks, data constants, and data structures, turn to the
topic “Data Types” found in the Sub-Chapter 9K “Command Descriptions” of Chapter 9
“Driver488/SUB.”