National Instruments NI-488.2 ユーザーズマニュアル

© National Instruments Corporation

EOS or EOS Byte

A 7- or 8-bit end-of-string character that is sent as the last byte of a data 
message.

EOT

End of transmission.

ESB

The Event Status bit—Part of the IEEE 488.2-defined status byte which 
is received from a device responding to a serial poll.

FIFO

First-in-first-out.

GET

Group Execute Trigger—The GPIB command used to trigger a device 
or internal function of an addressed Listener.

GPIB

General Purpose Interface Bus—This is the common name for the 
communications interface system defined in ANSI/IEEE 
Standard 488.1-2003 and ANSI/IEEE Standard 488.2-1992.

GPIB address

The address of a device on the GPIB, composed of a primary address 
(MLA and MTA) and perhaps a secondary address (MSA). The GPIB 
board has both a GPIB address and an I/O address.

GPIB board

Refers to the National Instruments family of GPIB interfaces.

GTL

Go To Local—The GPIB command used to place an addressed Listener 
in local (front panel) control mode.

handshake

The mechanism used to transfer bytes from the source handshake function 
of one device to the acceptor handshake function of another device. DAV, 
NRFD, and NDAC, three GPIB lines, are used in an interlocked fashion to 
signal the phases of the transfer, so that bytes can be sent asynchronously 
(for example, without a clock) at the speed of the slowest device.

For more information about handshaking, refer to the ANSI/IEEE Standard 
488.1-2003.