Glossary
© National Instruments Corp.
Glossary-3
NI-488.2M UM for Windows NT
EOI
A GPIB line that is used to signal either the last byte of a data
message (END) or the parallel poll Identify (IDY) message.
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 is part of the IEEE 488.2-defined status
byte which is received from a device responding to a serial
poll.
G
GET
Group Execute Trigger is the GPIB command used to trigger a
(Group Execute
device or internal function of an addressed Listener.
Trigger)
GPIB
General Purpose Interface Bus is the common name for the
communications interface system defined in ANSI/IEEE
Standard 488.1-1987 and ANSI/IEEE Standard 488.2-1987.
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 o f GPIB interface
boards.
GTL
Go To Local is the GPIB command used to place an addressed
(Go To Local)
Listener in local (front panel) control mode.
H
handshake
The mechanism used to transfer bytes from the Source
Handshake function of one device to the Acceptor Handshake
function of another device. The three GPIB lines DAV,
NRFD, and NDAC 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 488.1-1987.
