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C-10
IEEE-488 Bus Overview
Model 6220/6221 Reference Manual
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Addressed multiline commands
Addressed commands are multiline commands that must be preceded by the
device listen address before that instrument will respond to the command in ques-
tion. Note that only the addressed device will respond to these commands. Both
the commands and the address preceding it are sent with ATN true.
SDC (Selective Device Clear)
— The SDC command performs essentially the
same function as the DCL command except that only the addressed device
responds. Generally, instruments return to their power-up default conditions when
responding to the SDC
command.
GTL (Go To Local)
— The GTL command is used to remove instruments from the
remote mode. With some instruments, GTL also unlocks front panel controls if
they were previously locked out with the LLO command.
GET (Group Execute Trigger)
— The GET command is used to trigger devices
to perform a specific action that depends on device configuration (for example,
take a reading). Although GET is an addressed command, many devices respond
to GET without addressing.
Address commands
Addressed commands include two primary command groups and a secondary
address group. ATN is true when these commands are asserted. The commands
include:
LAG (Listen Address Group)
— These listen commands are derived from an
instrument’s primary address and are used to address devices to listen. The
actual command byte is obtained by ORing the primary address with $20.
TAG (Talk Address Group)
— The talk commands are derived from the primary
address by ORing the address with $40. Talk commands are used to address
devices to talk.
SCG (Secondary Command Group)
— Commands in this group provide addi-
tional addressing capabilities. Many devices (including the Model 622x) do not
use these commands.
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